CN106385597A - Clock adjustment method, device, terminal and multimedia synchronous playback system - Google Patents

Abstract

The embodiment of the invention provides a clock adjusting method, a clock adjusting device, a terminal and a multimedia synchronous playing system; the method comprises the steps of acquiring a time error between a system clock of the self system and a system clock of a synchronous reference playing device in the process of playing multimedia data, then acquiring a distance between the synchronous reference playing device and the clock error when the absolute value of the clock error is smaller than a preset threshold value, judging whether the distance is larger than the preset distance, and if so, adjusting the system clock of the self system according to the time error to enable the time error to be zero; the scheme can improve the synchronism of multimedia playing among the multimedia playing devices.

Description

Clock adjustment method, device, terminal and multimedia synchronous playback system

technical field

The invention relates to the technical field of synchronous playback, in particular to a clock adjustment method, device, terminal and multimedia synchronous playback system.

Background technique

With the improvement of living standards, home audio-visual equipment plays an important role in people's lives. At present, it has been widely used to connect multiple multimedia playback devices (for example, speakers, players, etc.) and control devices to each other through a wired or wireless network to form a multimedia playback system, and to play the same multimedia such as music synchronously.

In the above multimedia playing system, each multimedia playing device has an independent clock system. Each playback device plays multimedia according to its own clock system. However, the clock systems of various multimedia playback devices and reference devices (generally control devices) are not always synchronized. There may be slight time differences between playback devices and reference devices. When multiple multimedia playback devices play the same multimedia such as music, the above-mentioned slight time difference leads to inconsistencies in the playback progress of each multimedia playback device, thus resulting in relatively low synchronization between multimedia playback devices.

Contents of the invention

Embodiments of the present invention provide a clock adjustment method, device, terminal and multimedia synchronous playback system, which can improve the synchronization of multimedia playback between multimedia playback devices.

An embodiment of the present invention provides a clock adjustment method, including:

In the process of playing multimedia data, obtain the time error between the self system clock and the system clock of the synchronous reference playback device;

When the absolute value of the clock error is less than a preset threshold, acquire the distance from the synchronous reference playback device;

judging whether the distance is greater than a preset distance;

If so, adjust the own system clock according to the time error, so that the time error is zero.

Correspondingly, an embodiment of the present invention also provides a clock adjustment device, including:

The error acquisition unit is used to acquire the time error between its own system clock and the system clock of the synchronous reference playback device in the process of playing multimedia data;

A distance acquiring unit, configured to acquire the distance from the synchronous reference playback device when the absolute value of the clock error is less than a preset threshold;

a distance judging unit, configured to judge whether the distance is greater than a preset distance;

The adjustment unit is configured to adjust the own system clock according to the time error when the distance judging unit judges that the distance is greater than the preset distance, so that the time error is zero.

Correspondingly, the embodiment of the present invention also provides a terminal, including:

a memory storing executable program code;

a processor coupled to the memory;

The processor invokes the executable program code stored in the memory to execute any clock adjustment method provided by the embodiments of the present invention.

Correspondingly, an embodiment of the present invention also provides a multimedia synchronous playback system, including: a control device and at least one playback device; the control device is connected to the playback device; Either clock adjustment method.

In the embodiment of the present invention, in the process of playing multimedia data, the time error between the own system clock and the system clock of the synchronous reference playback device is obtained, and then, when the absolute value of the clock error is less than the preset threshold value, the synchronization with the time error is obtained. Referring to the distance between the playback devices, it is judged whether the distance is greater than the preset distance, and if so, the self-system clock is adjusted according to the time error, so that the time error is zero. This solution can adjust the system clock during multimedia playback and when the distance from the synchronous reference playback device is greater than the preset distance, so that the system clock is synchronized with the reference clock, thereby achieving the effect of multiple playback devices synchronously playing multimedia Compared with the prior art, the synchronization of playing multimedia between multimedia playing devices can be improved.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to these drawings without creative work.

FIG. 1 is a schematic flowchart of a clock adjustment method provided by Embodiment 1 of the present invention.

FIG. 2 is a schematic flowchart of a clock adjustment method provided by Embodiment 2 of the present invention.

FIG. 3 is a schematic structural diagram of a first clock adjusting device provided in Embodiment 3 of the present invention.

FIG. 4 is a schematic structural diagram of a second clock adjustment device provided by Embodiment 3 of the present invention.

FIG. 5 is a schematic diagram of a scene of a multimedia synchronous playback system provided by Embodiment 4 of the present invention.

FIG. 6 is a schematic structural diagram of a terminal provided in Embodiment 5 of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

The terms "first", "second", "third", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects and not necessarily to describe a specific order or sequentially. It should be understood that the items so described are interchangeable under appropriate circumstances. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, a method comprising a series of steps, or a device, a terminal, a system comprising a series of modules or units are not necessarily limited to those steps or modules or units clearly listed, and may also include steps or units not clearly listed. A module or unit may also include other steps or modules or units inherent to these processes, methods, apparatuses, terminals or systems.

Embodiments of the present invention provide a clock adjustment method, device, terminal, and multimedia synchronous playback system, which will be described in detail below.

Embodiment one

This embodiment will be described from the perspective of a clock adjustment device. The clock adjustment device may be integrated into a playback device, which may be a playback device such as a terminal (smart phone, tablet computer, etc.), a speaker, or the like.

A clock adjustment method, comprising: in the process of playing multimedia data, obtaining the time error between the own system clock and the system clock of a synchronous reference playback device, and then obtaining the same time error when the absolute value of the clock error is less than a preset threshold The synchronization refers to the distance between the playback devices, and judges whether the distance is greater than the preset distance, and if so, adjusts its own system clock according to the time error, so that the time error is zero.

As shown in Figure 1, the specific process of the clock adjustment method may include:

101. During the process of playing multimedia data, acquire a time error between the own system clock and the system clock of the synchronization reference playback device.

Wherein, the multimedia data may be audio data, audio and video data, and so on. The audio data includes but not limited to CD, WAV, MP3 (Moving Picture Experts Group Audio Layer III), WMA (Windows Media Audio) and other formats.

In this embodiment, the system clock of the synchronous reference playback device is the reference clock for synchronous playback. The synchronous reference playback device is a reference device for synchronous playback, which can be selected from playback devices. When the control device also plays multimedia in the multimedia playback system, the control device is also a playback device. Therefore, the synchronous reference playback device may be a playback device, or a control device. In practical applications, a device may be selected from the playback devices as a reference device according to actual needs.

Wherein, the multimedia data may be audio data, audio and video data, and so on. The audio data includes but not limited to CD, WAV, MP3 (Moving Picture Experts Group Audio Layer III), WMA (Windows Media Audio) and other formats.

In this embodiment, the system clock of the synchronous reference playback device is the reference clock for synchronous playback. The synchronous reference playback device is a reference device for synchronous playback, which can be selected from playback devices. When the control device also plays multimedia in the multimedia playback system, the control device is also a playback device. Therefore, the synchronous reference playback device may be a playback device, or a control device. In practical applications, a device may be selected from the playback devices as a reference device according to actual needs.

102. Acquire a distance from the synchronization reference playback device when the absolute value of the clock error is smaller than a preset threshold.

Specifically, after obtaining the time error and before obtaining the distance, the method in this embodiment may further include:

It is judged whether the absolute value of the clock error is smaller than a preset threshold, and if smaller, the step of obtaining the distance from the synchronous reference playback device is performed.

Among them, there are many ways to obtain the distance from the synchronous reference playback device. For example, it can be obtained according to the signal strength, that is, the step "obtaining the distance from the synchronous reference playback device" may include:

sending a test signal to the synchronous reference playback device;

Receive the signal strength of the test signal returned by the synchronous reference playback device;

According to the signal strength, the distance to the synchronization reference playback device is acquired.

Specifically, the attenuation of the signal strength may be obtained according to the signal strength when the test signal is sent and the received signal strength returned by the synchronous reference playback device, and then the distance is calculated based on the attenuation.

For another example, it can be obtained by the signal transmission speed and the time difference between signal transmission and reception, that is, the step "obtaining the distance from the synchronous reference playback device" may include:

Send a test signal to the synchronous reference playback device, and record the sending time;

Obtain the receiving time of receiving the test signal returned by the synchronous reference playback device;

Acquire the distance to the synchronous reference playback device according to the sending time, receiving time and the propagation speed of the test signal.

In this embodiment, the test signal may be an infrared signal, a bluetooth signal, or the like.

103. Determine whether the distance is greater than the preset distance, if yes, perform step 104, if not, no adjustment is required, and the process ends.

In actual situations, there will be a certain delay in sound propagation, which will increase the synchronization error of synchronous playback. Among them, the delay of sound propagation is related to the physical distance between playback devices. When the physical distance between playback devices is relatively large, the delay of sound propagation is also relatively large, resulting in relatively large synchronization errors; When the physical distance is relatively small, the delay of sound propagation is also relatively small, and at this time, the influence on the synchronization error is relatively low.

In order to improve the synchronization of media playback and save resources, the method of this embodiment can determine whether to adjust synchronously based on the distance between devices when the clock error is relatively small; as follows:

(1) When the absolute value of the clock error is less than the preset threshold and the distance between the devices is greater than the preset distance, perform synchronization adjustment. Wherein, the preset threshold can be set according to the absolute value of the synchronization error that the user can tolerate. For example, the preset threshold can be equal to the synchronization error that the user can tolerate, such as 1 ms.

For example, when the current clock error or synchronization error is small (such as less than the synchronization error that the user can tolerate), but the physical distance between the playback devices is relatively large (greater than the preset distance), the delay of sound propagation is relatively large, and it will be slower. Greatly affects the synchronization error, making the synchronization error larger. At this time, when the synchronization exceeds the synchronization error that the user can tolerate, synchronization adjustment is required to improve the synchronization of media playback and the quality of media output; for example, if the synchronization error is 1ms, When the physical distance between playback devices is relatively large, there may be a relatively large delay in the propagation of sound, so the actual synchronization error may be 2ms.

Wherein, the preset distance can be set according to experience values, such as 10 meters, 8 meters and so on.

(2) When the absolute value of the clock error is less than the preset threshold and the distance between the devices is not greater than the preset distance, no synchronization adjustment is performed.

If the synchronization error is small (such as less than the synchronization error that the user can tolerate), and the physical distance between the playback devices is small, the delay of sound propagation is relatively small. At this time, the delay of sound propagation is small, and its influence on the synchronization error The degree of influence is relatively low, and the synchronization error is almost unchanged; since the synchronization error is smaller than the synchronization error that the user can tolerate at this time, it does not need to perform synchronization adjustment, saving resources. For example, if the synchronization error is 1ms, the physical distance between playback devices is relatively small, and the delay in sound propagation is relatively small. At this time, the actual synchronization error can be 1.5ms, which is less than the 2m synchronization error that users can tolerate. Therefore, it can Synchronization adjustments are not required.

Optionally, when the clock error is relatively large, that is, when the absolute value of the clock error is not less than the preset threshold, at this time, in order to improve the synchronization of media playback, this embodiment can also adjust its own system clock according to the time error , so that the time error is zero.

104. Adjust the own system clock according to the time error, so that the time error is zero.

Specifically, the adjustment direction and adjustment amount of the synchronous adjustment may be determined according to the time error, and the own system clock may be adjusted according to the adjustment direction and adjustment amount.

Wherein, the adjustment direction may include a positive direction or a negative direction, the positive direction adjustment is to speed up the system clock, and the negative direction adjustment is to slow down the system clock. It can also be: the adjustment in the negative direction is to speed up the system clock, and the adjustment in the positive direction is to slow down the system clock; specifically, it can be set according to actual needs.

Specifically, when the time error is the time difference between the current time of itself and the current time of the reference device, the adjustment in the positive direction is to speed up the system clock, and the adjustment in the negative direction is to slow down the system clock, if the time error is greater than zero, determine the synchronization adjustment If the adjustment direction is negative, it needs to slow down its own system clock; if the time error is less than zero, it is determined that the adjustment direction is positive, that is, it needs to speed up its own system clock.

Wherein, the adjustment amount may be an absolute value of the time error, for example, when the time error is 20 ms, the adjustment amount is 20 ms, and when the time error is -30 ms, the adjustment amount is 30 ms.

In this embodiment, after obtaining the adjustment direction and the adjustment amount, the system clock can be adjusted by an adjustment amount according to the adjustment direction; for example, the system clock can be accelerated by an adjustment amount, such as by 20 ms.

For example, when the clock error is 10ms, the adjustment amount can be 10ms, and the adjustment direction is the negative direction, then the own system clock can be adjusted by 10ms in the negative direction, even if the system clock is slowed down by 10ms.

Optionally, in order to avoid one-time adjustment of the system clock to reduce multimedia output quality, this embodiment may fine-tune its own system clock multiple times according to the adjustment direction and adjustment amount, so that the time error is zero.

For example, the system clock can be fine-tuned multiple times according to the adjustment amount (in this case, the total adjustment amount), the adjustment direction, and the preset adjustment amount. The preset adjustment amount can be set according to actual needs, for example, it can be 10ms, 20ms, 1s and so on.

For example, when the time error is 15ms and the preset adjustment amount is 5ms, you can first adjust a preset adjustment amount for 5ms according to the adjustment direction, and then adjust a preset adjustment amount for 5ms according to the adjustment direction again after a preset period of time, and then after After three adjustments, the time error can be made zero.

As can be seen from the above, in the embodiment of the present invention, during the process of playing multimedia data, the time error between its own system clock and the system clock of the synchronous reference playback device is obtained, and then the distance between the synchronous reference playback device and the synchronous reference playback device is obtained to judge Whether the distance is greater than the preset distance, if so, adjust the own system clock according to the time error, so that the time error is zero. This solution can adjust the system clock during multimedia playback and when the distance from the synchronous reference playback device is greater than the preset distance, so that the system clock is synchronized with the reference clock, thereby achieving the effect of multiple playback devices synchronously playing multimedia Compared with the prior art, the synchronization of playing multimedia between multimedia playing devices can be improved.

In addition, in the embodiment of the present invention, when the absolute value of the clock error is less than the preset threshold (when the clock error is small), and the distance from the synchronous reference playback device is greater than the preset distance, the system clock is adjusted, so that the actual playback can be maintained. On the premise of synchronization, resources are saved and the flexibility of clock adjustment is improved. And this embodiment can also directly adjust the system clock when the absolute value of the clock error is not less than the preset threshold (that is, when the clock error is large), which improves the synchronization of media playback and the timeliness of synchronization adjustment, greatly improving user experience.

Embodiment two

According to the clock adjustment method described in Embodiment 1, an example will be given below for further detailed description.

In this embodiment, a detailed description will be made by taking the integration of the clock adjusting device described in Embodiment 1 into a playback device as an example.

As shown in Figure 2, a clock adjustment method, the specific process is as follows:

201. During the process of playing multimedia data, the playback device acquires a time error between its own system clock and the system clock of the synchronization reference playback device.

Wherein, the multimedia data may be audio data, audio and video data, and so on. There are many formats of the audio data, for example, MP3 format, WMA format and so on.

In this embodiment, the synchronous reference playback device may be a playback device or a control device.

Specifically, the playback device obtains the current first system time of the synchronization reference device and its own current second system time, and then obtains the time error between the system clock and the reference clock according to the second system time and the first system time. For example, the first system time is 1:06, and the second system time is 1:00. At this time, the time error can be obtained as -6s.

202. The playback device determines that the absolute value of the time error is smaller than a preset threshold, if yes, execute step 203, and if not, execute step 205.

Wherein, the preset threshold can be set according to actual needs, for example, it can be set according to the synchronization error that the user can tolerate, and the preset threshold can be 1 ms, 2 ms and so on.

In this embodiment, when the time error is small, whether to adjust can be determined based on the distance between devices, and when the time error is large, the adjustment can be directly performed.

203. The playback device acquires a distance from the synchronization reference playback device.

The distance is the physical distance between the playback device and the synchronization reference playback device. There are multiple ways to acquire the distance, for example, it may be acquired based on signal strength.

Specifically, the playback device may send a test signal to the synchronization reference playback device, receive the signal strength of the test signal returned by the synchronization reference playback device, and obtain the distance from the synchronization reference playback device according to the signal strength.

Wherein, the test signal may be an infrared signal, a bluetooth signal or the like.

204. The playback device judges whether the distance is greater than the preset distance, if yes, execute step 205, if not, do not adjust the clock, and end the process.

considering. The impact of sound propagation delay on the synchronization error of synchronous playback, and the distance between playback devices will affect the delay, which in turn affects the synchronization error. In this embodiment, when the time error is small, it may be determined based on the distance between devices whether to perform adjustment, so as to save resources.

205. The playback device determines the adjustment direction and adjustment amount that need to be adjusted according to the time error.

Wherein, the adjustment direction may include a positive direction or a negative direction, the positive direction adjustment is to speed up the system clock, and the negative direction adjustment is to slow down the system clock. Wherein, the adjustment amount is the absolute value of the time error.

If the time error is greater than zero, it is determined that the adjustment direction of the synchronous adjustment is the negative direction, that is, the own system clock needs to be slowed down; if the time error is less than zero, the adjustment direction is determined to be the positive direction, that is, the own system clock needs to be accelerated. For example, when the time error is -6s, it can be determined that the adjustment direction is positive and the adjustment amount is 6s.

206. The playback device adjusts the system clock according to the adjustment direction and the adjustment amount, so that the time error is zero.

For example, the system clock is adjusted by an adjustment amount according to the adjustment direction; for example, the system clock is accelerated by an adjustment amount, such as by 20 ms.

Optionally, in order to avoid one-time adjustment of the system clock to reduce multimedia output quality, the playback device in this embodiment may fine-tune the system clock multiple times according to the adjustment direction and adjustment amount, so that the time error is zero. For example, the time error is zero through five adjustments.

During specific implementation, the present invention is not limited by the execution order of the described steps, and some steps may be performed in other orders or simultaneously if no conflict arises.

It can be seen from the above that, in the process of playing multimedia data, the playback device in the embodiment of the present invention obtains the time error between its own system clock and the system clock of the synchronous reference playback device, and then, when the absolute value of the clock error is less than the preset threshold Acquiring the distance from the synchronous reference playback device, judging whether the distance is greater than the preset distance, if so, adjusting the own system clock according to the time error, so that the time error is zero. This solution can adjust the system clock during multimedia playback and when the distance from the synchronous reference playback device is greater than the preset distance, so that the system clock is synchronized with the reference clock, thereby achieving the effect of multiple playback devices synchronously playing multimedia Compared with the prior art, the synchronization of playing multimedia between multimedia playing devices can be improved.

In addition, when the absolute value of the clock error of the playback device in the embodiment of the present invention is less than the preset threshold (when the clock error is small), and the distance between the playback device and the synchronous reference playback device is greater than the preset distance, the system clock can be adjusted to maintain On the premise of actual playback synchronization, resources are saved and the flexibility of clock adjustment is improved. And this embodiment can also directly adjust the system clock when the absolute value of the clock error is not less than the preset threshold (that is, when the clock error is large), which improves the synchronization of media playback and the timeliness of synchronization adjustment, greatly improving user experience.

Embodiment three

In order to better implement the above method, an embodiment of the present invention also provides a clock adjustment device, which can be integrated into a playback device, and the playback device can be a smart phone, a tablet computer, a speaker, and the like.

As shown in Figure 3, the clock adjustment device 300 may include: an error acquisition unit 301, a distance acquisition unit 302, a distance judgment unit 303, and an adjustment unit 304, as follows:

An error acquisition unit 301 is used to acquire the time error between the system clock of itself and the system clock of the synchronous reference playback device during the process of playing multimedia data;

A distance acquiring unit 302, configured to acquire a distance from the synchronous reference playback device when the absolute value of the clock error is less than a preset threshold;

A distance judging unit 303, configured to judge whether the distance is greater than a preset distance;

The adjusting unit 304 is configured to adjust the own system clock according to the time error when the distance judging unit 303 judges that the distance is greater than the preset distance, so that the time error is zero.

Wherein, the distance acquisition unit 302 in this embodiment is specifically used for:

When the absolute value of the clock error is less than a preset threshold, a test signal is sent to the synchronous reference playback device;

Receive the signal strength of the test signal returned by the synchronous reference playback device;

According to the signal strength, the distance to the synchronization reference playback device is acquired.

Referring to FIG. 4, the adjustment unit 304 in this embodiment may specifically include:

A determining subunit 3041, configured to determine the adjustment direction and adjustment amount of the synchronous adjustment according to the time error;

The adjustment subunit 3042 is configured to adjust its own system clock according to the adjustment direction and adjustment amount.

Wherein, the adjustment subunit 3042 may be specifically configured to fine-tune its own system clock multiple times according to the adjustment direction and adjustment amount.

Optionally, in order to improve the timeliness of synchronous adjustment, the adjustment unit 304 in this embodiment is also used to:

When the absolute value of the time error is greater than the preset threshold, the self-system clock is adjusted according to the time error, so that the time error is zero.

During specific implementation, each of the above units may be implemented as an independent entity, or may be combined arbitrarily as the same or several entities. The specific implementation of each of the above units may refer to the previous method embodiments, and will not be repeated here.

As can be seen from the above, the embodiment of the present invention adopts the error acquisition unit 301 to acquire the time error between its own system clock and the system clock of the synchronous reference playback device in the process of playing multimedia data, and then, the distance acquisition unit 302 calculates the time error between the clock error When the absolute value of is less than the preset threshold value, the distance between the synchronous reference playback device and the synchronous reference playback device is obtained, and the distance judging unit 303 judges whether the distance is greater than the preset distance. Adjust so that this time error is zero. This solution can adjust the system clock during multimedia playback and when the distance from the synchronous reference playback device is greater than the preset distance, so that the system clock is synchronized with the reference clock, thereby achieving the effect of multiple playback devices synchronously playing multimedia Compared with the prior art, the synchronization of playing multimedia between multimedia playing devices can be improved.

In addition, in the embodiment of the present invention, when the absolute value of the clock error is less than the preset threshold (when the clock error is small), and the distance from the synchronous reference playback device is greater than the preset distance, the system clock is adjusted, so that the actual playback can be maintained. On the premise of synchronization, resources are saved and the flexibility of clock adjustment is improved. And this embodiment can also directly adjust the system clock when the absolute value of the clock error is not less than the preset threshold (that is, when the clock error is large), which improves the synchronization of media playback and the timeliness of synchronization adjustment, greatly improving user experience.

Embodiment four

According to the clock adjustment methods described in Embodiments 1 and 2, an example will be given below for further detailed description.

In this embodiment, a detailed description will be made by taking the clock adjustment apparatus described in Embodiments 1, 2 and 3 integrated in a slave device as an example.

An embodiment of the present invention provides a multimedia synchronous playback system, which may include: a control device and at least one playback device; the control device is connected to the playback device (such as through a network connection); the playback device is used to perform the above implementation Either of the clock tuning methods provided by the example.

Wherein, the control device may be a master device, and the playback device may be a slave device. Referring to FIG. 5 , this embodiment provides a multimedia synchronous playback system, including: a source device 10, a master device 20, and at least one slave device 30; the source device 10, the master device 20, and the slave device 30 can be connected through Networks are interconnected.

Wherein, the main control device 20 is used to control the slave device, which can be a terminal, such as a mobile phone, a tablet computer, etc., and the main control device can also be a playback device, such as a playback device such as a speaker; this embodiment will use the main control device 20 The terminal is used as an example for description.

The slave device 30 may be a playback device controlled by the master device 20, and the slave device may be a playback device such as a sound box or a terminal with a playback function.

Wherein, the source device 10 is used to provide multimedia data to be played, which may be a network device such as a server.

Before playing multimedia synchronously, this embodiment can select a device from multiple slave devices 30 as a reference device for synchronous playback. During the process of synchronous playback, the clocks of all slave devices will be synchronized with the system clock of the reference device. For example, the master control device 20 may select a slave device from multiple slave devices 30 as a reference device for synchronous playback, and then send the identifier of the reference device to each slave device.

It should be noted that: when the master device 20 also receives and plays the media data distributed by itself in addition to distributing media data, the master device 20 is also a slave device. At this time, the main control device 20 may be selected as the reference broadcast device.

The process of multimedia playback is as follows:

The source device 10 sends multimedia data to the master device 20; the master device 20 packages the multimedia data to obtain multiple media data packets; the master device 20 sends media data packets to each slave device 30; the slave device 30 buffers the media data packets and play the cached media packets. Then the slave device 30 executes the clock adjustment steps described in Embodiments 1 and 2. I won't repeat them here.

As can be seen from the above, in the process of playing multimedia data in the embodiment of the present invention, the slave device 30 obtains the time error between its own system clock and the system clock of the synchronous reference playback device, and then, when the absolute value of the clock error is less than the preset threshold Acquire the distance between the synchronous reference playback device and whether the distance is greater than the preset distance, if so, adjust the system clock according to the time error, so that the time error is zero. This solution can adjust the system clock during multimedia playback and when the distance from the synchronous reference playback device is greater than the preset distance, so that the system clock is synchronized with the reference clock, thereby achieving the effect of multiple playback devices synchronously playing multimedia Compared with the prior art, the synchronization of playing multimedia between multimedia playing devices can be improved.

In addition, in the embodiment of the present invention, the slave device 30 adjusts the system clock when the absolute value of the clock error is less than the preset threshold (when the clock error is small), and the distance between the slave device and the synchronous reference playback device is greater than the preset distance. On the premise of keeping the actual playback synchronization, resources are saved and the flexibility of clock adjustment is improved. And this embodiment can also directly adjust the system clock when the absolute value of the clock error is not less than the preset threshold (that is, when the clock error is large), which improves the synchronization of media playback and the timeliness of synchronization adjustment, greatly improving user experience.

Embodiment five

The embodiment of the present invention also provides a terminal. As shown in FIG. 6, the terminal 400 may include a radio frequency (RF, Radio Frequency) circuit 401, a memory 402 including one or more computer-readable storage media, an input unit 403, a display A unit 404 , a sensor 405 , an audio circuit 406 , a wireless fidelity (WiFi, Wireless Fidelity) module 407 , a processor 408 including one or more processing cores, and a power supply 409 and other components. Those skilled in the art can understand that the terminal structure shown in FIG. 6 does not constitute a limitation on the terminal, and may include more or less components than those shown in the figure, or combine some components, or arrange different components.

The radio frequency circuit 401 can be used to send and receive information, or to receive and send signals during a call. In particular, after receiving the downlink information from the base station, it is processed by one or more processors 408; in addition, the uplink data is sent to the base station . Generally, the radio frequency circuit 401 includes but is not limited to an antenna, at least one amplifier, a tuner, one or more oscillators, a Subscriber Identity Module (SIM, Subscriber Identity Module) card, a transceiver, a coupler, a low noise amplifier (LNA, Low Noise Amplifier), duplexer, etc. In addition, the radio frequency circuit 401 can also communicate with the network and other devices through wireless communication. The wireless communication can use any communication standard or protocol, including but not limited to Global System for Mobile Communications (GSM, Global System of Mobile communication), General Packet Radio Service (GPRS, General Packet Radio Service), Code Division Multiple Access (CDMA, Code Division Multiple Access), Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access), Long Term Evolution (LTE, Long Term Evolution), email, Short Message Service (SMS, Short Messaging Service), etc.

Memory 402 may be used to store applications and data. The application programs stored in the memory 402 include executable program codes. Applications can be composed of various functional modules. The processor 408 executes various functional applications and data processing by running the application programs stored in the memory 402 . The memory 402 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application program required by a function (such as a sound playback function, an image playback function, etc.); Data created by the use of the terminal (such as audio data, phonebook, etc.) and the like. In addition, the memory 402 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage devices. Correspondingly, the memory 402 may further include a memory controller to provide the processor 408 and the input unit 403 with access to the memory 402 .

The input unit 403 can be used to receive input numbers, character information or user characteristic information (such as fingerprints), and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control. Specifically, the input unit 403 may include a fingerprint identification module. In some embodiments, the input unit 403 may also include a touch-sensitive surface. A touch-sensitive surface, also known as a touch display or trackpad, collects user touch operations on or near it (for example, the user uses a finger, stylus, etc. any suitable object or accessory on the touch-sensitive surface or on the touch-sensitive Operation near the surface), and drive the corresponding connection device according to the preset program. Optionally, the touch-sensitive surface may include two parts: a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, and detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and sends it to the to the processor 408, and can receive and execute commands sent by the processor 408. In addition, touch-sensitive surfaces can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to touch-sensitive surfaces, the input unit 403 may also include other input devices. Specifically, other input devices may include, but are not limited to, one or more of physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, joysticks, and the like.

The display unit 404 can be used to display information input by or provided to the user and various graphical user interfaces of the terminal. These graphical user interfaces can be composed of graphics, text, icons, videos and any combination thereof. The display unit 404 may include a display panel. Optionally, the display panel may be configured in the form of a liquid crystal display (LCD, Liquid Crystal Display), an organic light-emitting diode (OLED, Organic Light-Emitting Diode), or the like. Further, the touch-sensitive surface may cover the display panel, and when the touch-sensitive surface detects a touch operation on or near it, the touch operation is sent to the processor 408 to determine the type of the touch event, and then the processor 408 displays on the display according to the type of the touch event. The corresponding visual output is provided on the panel. Although in FIG. 6, the touch-sensitive surface and the display panel are used as two independent components to realize the input and input functions, in some embodiments, the touch-sensitive surface and the display panel can be integrated to realize the input and output functions.

The terminal may also include at least one sensor 405, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel according to the brightness of the ambient light, and the proximity sensor may turn off the display panel and/or the backlight when the terminal moves to the ear . As a kind of motion sensor, the gravitational acceleration sensor can detect the magnitude of acceleration in various directions (generally three axes), and can detect the magnitude and direction of gravity when it is stationary, and can be used for applications that recognize the attitude of mobile phones (such as horizontal and vertical screen switching, related Games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tap), etc.; as for other sensors such as gyroscope, barometer, hygrometer, thermometer, infrared sensor, etc. repeat.

The audio circuit 406 can provide an audio interface between the user and the terminal through a speaker or a microphone. The audio circuit 406 can convert the received audio data into an electrical signal, transmit it to the speaker, and convert it into a sound signal output by the speaker; on the other hand, the microphone converts the collected sound signal into an electrical signal, which is converted into The audio data, after being processed by the audio data output processor 408, is sent to another terminal through the radio frequency circuit 401, or the audio data is output to the memory 402 for further processing. The audio circuit 406 may also include an earplug jack to provide communication between an external earphone and the terminal.

Wireless Fidelity (WiFi) is a short-distance wireless transmission technology. The terminal can help users send and receive emails, browse web pages, and access streaming media through the WiFi module 407. It provides users with wireless broadband Internet access. Although Fig. 6 shows the Wi-Fi module 407, it can be understood that it is not an essential component of the terminal, and can be completely omitted as required without changing the essence of the invention.

The processor 408 is the control center of the terminal. It uses various interfaces and lines to connect various parts of the entire terminal. By running or executing the application program stored in the memory 402 and calling the data stored in the memory 402, various functions of the terminal are executed. function and process data, so as to monitor the terminal as a whole. Optionally, the processor 408 may include one or more processing cores; preferably, the processor 408 may integrate an application processor and a modem processor, wherein the application processor mainly processes operating systems, user interfaces, and application programs, etc. , the modem processor mainly handles wireless communications. It can be understood that the foregoing modem processor may not be integrated into the processor 408 .

The terminal also includes a power source 409 (such as a battery) for powering various components. Preferably, the power supply can be logically connected to the processor 408 through a power management system, so that functions such as charging, discharging, and power consumption management can be implemented through the power management system. The power supply 409 may also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

Although not shown in FIG. 6 , the terminal may also include a camera, a Bluetooth module, etc., which will not be repeated here.

Specifically, in this embodiment, the processor 408 in the terminal loads the executable program code corresponding to the process of one or more application programs into the memory 402 according to the following instructions, and the processor 408 executes the executable program code stored in the The application program in memory 402, thereby realizes various functions:

In the process of playing multimedia data, the time error between the self system clock and the system clock of the synchronous reference playback device is obtained, and then, when the absolute value of the clock error is less than the preset threshold value, the time error between the synchronous reference playback device and the synchronous reference playback device is obtained distance, judging whether the distance is greater than the preset distance, if so, adjusting the own system clock according to the time error, so that the time error is zero.

Preferably, the distance between the acquisition and the synchronous reference playback device includes:

sending a test signal to the synchronous reference playback device;

Receive the signal strength of the test signal returned by the synchronous reference playback device;

According to the signal strength, the distance to the synchronization reference playback device is acquired.

Preferably, the self-system clock is adjusted according to the time error, including:

Determine the adjustment direction and adjustment amount of synchronous adjustment according to the time error;

The self-system clock is adjusted according to the adjustment direction and adjustment amount.

Preferably, adjusting the self-system clock according to the adjustment direction and the adjustment amount includes: fine-tuning the self-system clock several times according to the adjustment direction and the adjustment amount.

Preferably, the processor 408 further implements a function: when the absolute value of the time error is greater than a preset threshold, adjust its own system clock according to the time error, so that the time error is zero.

For details of the above operations, reference may be made to the foregoing method embodiments, and details are not repeated here.

It can be seen from the above that the embodiment of the present invention provides a terminal, the terminal obtains the time error between its own system clock and the system clock of the synchronous reference playback device during the process of playing multimedia data, and then, when the clock error When the absolute value is less than the preset threshold, the distance to the synchronous reference playback device is obtained, and it is judged whether the distance is greater than the preset distance. If so, the self-system clock is adjusted according to the time error, so that the time error is zero. This solution can adjust the system clock during multimedia playback and when the distance from the synchronous reference playback device is greater than the preset distance, so that the system clock is synchronized with the reference clock, thereby achieving the effect of multiple playback devices synchronously playing multimedia Compared with the prior art, the synchronization of playing multimedia between multimedia playing devices can be improved.

It should be noted that those skilled in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. The medium may include: a read only memory (ROM, Read Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and the like.

A clock adjustment method, device, terminal, and multimedia synchronous playback system provided by the embodiments of the present invention have been described above in detail. In this paper, specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments It is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, this specification The content should not be construed as a limitation of the invention.

Claims (12)

1. a kind of clock adjustment is it is characterised in that include：

During playing multi-medium data, obtain between itself system clock and the system clock of reference synchronization playback equipment Time error；

When described clocking error absolute value be less than predetermined threshold value when, obtain and described reference synchronization playback equipment between away from From；

Judge whether described distance is more than predeterminable range；

If so, then according to described time error, its own system clock is adjusted, so that described time error is zero.

2. clock adjustment as claimed in claim 1 is it is characterised in that described acquisition and described reference synchronization playback equipment The distance between, including：

Send test signal to described reference synchronization playback equipment；

Receive the signal intensity of the test signal that described reference synchronization playback equipment returns；

According to the distance between the acquisition of described signal intensity and reference synchronization playback equipment.

3. clock adjustment as claimed in claim 1 is it is characterised in that according to described time error to its own system clock It is adjusted, including：

Determine regulation direction and the regulated quantity of adjusted in concert according to described time error；

According to described regulation direction and regulated quantity, its own system clock is adjusted.

4. clock adjustment as claimed in claim 3 is it is characterised in that according to described regulation direction and regulated quantity to itself System clock is adjusted, including：According to described regulation direction and regulated quantity, its own system clock is repeatedly finely tuned.

5. clock adjustment as claimed in claim 1 is it is characterised in that also include：

When the absolute value of described time error is more than predetermined threshold value, according to described time error, its own system clock is adjusted Section, so that described time error is zero.

6. a kind of clock adjustment apparatus are it is characterised in that include：

Error acquiring unit, is play with reference synchronization for during playing multi-medium data, obtaining itself system clock Time error between the system clock of equipment；

Distance acquiring unit, for when the absolute value of described clocking error is less than predetermined threshold value, obtaining and described reference synchronization The distance between playback equipment；

Distance Judgment unit, for judging whether described distance is more than predeterminable range；

Adjustment unit, for when Distance Judgment unit judges distance is more than predeterminable range, according to described time error to itself being System clock is adjusted, so that described time error is zero.

7. clock adjustment apparatus as claimed in claim 6 are it is characterised in that described distance acquiring unit, specifically for：

When the absolute value of described clocking error is less than predetermined threshold value, send test signal to described reference synchronization playback equipment；

Receive the signal intensity of the test signal that described reference synchronization playback equipment returns；

According to the distance between the acquisition of described signal intensity and reference synchronization playback equipment.

8. clock adjustment apparatus as claimed in claim 6 are it is characterised in that described adjustment unit, specifically for：

Determination subelement, for determining regulation direction and the regulated quantity of adjusted in concert according to described time error；

Regulator unit, for being adjusted to its own system clock according to described regulation direction and regulated quantity.

9. clock adjustment apparatus as claimed in claim 6 are it is characterised in that described regulator unit, specifically for：According to institute State regulation direction and regulated quantity is repeatedly finely tuned to its own system clock.

10. clock adjustment apparatus as claimed in claim 6, it is characterised in that described adjustment unit, are additionally operable to：

When the absolute value of described time error is more than predetermined threshold value, according to described time error, its own system clock is adjusted Section, so that described time error is zero.

A kind of 11. terminals are it is characterised in that include：

Be stored with the memorizer of executable program code；

The processor coupling with described memorizer；

Described processor calls the described executable program code of storage in described memorizer, and execution such as claim 1 is to right Require the method described in 5 any one.

A kind of 12. multimedia synchronous Play Systems are it is characterised in that include：Control device and at least one playback equipment；Described Control device is connected with described playback equipment；Described playback equipment is used for execution if claim 1 is to any one of claim 5 institute The method stated.