CN106255035B - Method and system for wirelessly transmitting virtual reality positioning data - Google Patents
Method and system for wirelessly transmitting virtual reality positioning data Download PDFInfo
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- CN106255035B CN106255035B CN201610581497.XA CN201610581497A CN106255035B CN 106255035 B CN106255035 B CN 106255035B CN 201610581497 A CN201610581497 A CN 201610581497A CN 106255035 B CN106255035 B CN 106255035B
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Abstract
The invention discloses a method and a system for wirelessly transmitting virtual reality positioning data, wherein the method comprises the following steps: a wireless communication module is arranged on the virtual reality helmet; arranging a plurality of wireless camera devices around the space where the virtual reality helmet is located, and wirelessly connecting each wireless camera device to the wireless communication module respectively; controlling a wireless communication module to sequentially send the same periodic square wave signals to each wireless camera device by adopting the same frequency band according to a preset time interval; every wireless camera equipment of control sends the locating data to wireless communication module at the moment that received square wave signal's rising edge and falling edge correspond, control wireless communication module at the moment that square wave signal's next rising edge or falling edge correspond, send the locating data of all received wireless camera equipment for the virtual reality helmet, realized the low-delay transmission of virtual reality locating data with wireless mode, make the user can use the virtual reality system in a flexible way, user experience has been improved.
Description
Technical Field
The invention relates to the technical field of virtual reality, in particular to a method and a system for wirelessly transmitting virtual reality positioning data.
Background
The virtual reality system has very high requirement to the transmission delay of locating data, and in order to satisfy the requirement of delay, current virtual reality system adopts wired mode transmission locating data usually, and not only the installation is difficult, and the user is small, inconvenient to use when using the virtual reality system moreover, may take place danger because of stepping on the line even in the use. The current wireless transmission scheme cannot meet the high requirement of a virtual reality system on the transmission delay of the positioning data.
Disclosure of Invention
The invention provides a method and a system for wirelessly transmitting virtual reality positioning data, which aim to transmit the virtual reality positioning data in a wireless manner with low delay, meet the high requirement of a virtual reality system on the transmission delay of the positioning data, prevent a user from being bound by wires, flexibly use the virtual reality system and improve the user experience.
According to an aspect of the present invention, the present invention provides a method for wirelessly transmitting virtual reality positioning data, including:
a wireless communication module is arranged on the virtual reality helmet;
arranging a plurality of wireless camera devices around the space where the virtual reality helmet is located, and wirelessly connecting each wireless camera device to the wireless communication module respectively;
controlling the wireless communication module to sequentially send the same periodic square wave signals to each wireless camera device by adopting the same frequency band according to a preset time interval;
controlling each wireless camera device to send positioning data to the wireless communication module at the moment corresponding to the rising edge and the falling edge of the received square wave signal;
and controlling the wireless communication module to send the received positioning data of all the wireless camera devices to the virtual reality helmet at the moment corresponding to the next rising edge or falling edge of the square wave signal.
Wherein the wireless communication module is wirelessly connected with 4 wireless camera devices.
Wherein, the period of the square wave signal is 6 milliseconds, and the high level duration is 3 milliseconds.
Wherein the predetermined time interval is 250 microseconds.
According to another aspect of the present invention, the present invention provides a system for wirelessly transmitting virtual reality positioning data, including a wireless communication module disposed on a virtual reality helmet, and a plurality of wireless camera devices disposed around a space where the virtual reality helmet is located;
each wireless camera device is respectively wirelessly connected to the wireless communication module, and the wireless communication module sequentially transmits the same periodic square wave signal to each wireless camera device by adopting the same frequency band according to a preset time interval;
each wireless camera device sends positioning data to the wireless communication module at the moment corresponding to the rising edge and the falling edge of the received square wave signal;
and the wireless communication module sends the received positioning data of all the wireless camera devices to the virtual reality helmet at the moment corresponding to the next rising edge or falling edge of the square wave signal.
Wherein the wireless communication module is wirelessly connected with 4 wireless camera devices.
Wherein, the period of the square wave signal is 6 milliseconds, and the high level duration is 3 milliseconds.
Wherein the predetermined time interval is 250 microseconds.
The embodiment of the invention has the beneficial effects that: through wireless communication module with each wireless camera device wireless connection to on the virtual reality helmet respectively, adopt same frequency channel to send the same periodic square wave signal to every wireless camera device in proper order according to time interval, every wireless camera device sends the positioning data at the moment that received square wave signal's rising edge and falling edge correspond, wireless communication module is at the moment that next rising edge or falling edge of square wave signal correspond, sends received positioning data for the virtual reality helmet. Compared with the frequency division multiple access technology, each wireless camera device adopts the whole channel for communication when transmitting data, the whole channel is not required to be divided into a plurality of independent sub-channels with narrow bandwidths, and the waste of certain frequency bands for spacing the sub-channels is not required. In a time period when one wireless image pickup device temporarily does not transmit data, other wireless image pickup devices can transmit data by using the channel, so that the utilization rate of the bandwidth is higher. Compared with the frequency hopping technology, the transmitted data packet does not need to be corrected, the data transmission delay cannot be increased due to frequent frequency hopping, the data transmission delay is shorter, the bandwidth of the wireless communication module is fully utilized, the data transmission delay is effectively reduced, the low-delay transmission of the virtual reality positioning data is realized in a wireless mode, the high requirement of the virtual reality system on the positioning data transmission delay is met, a user is not bound by wires, the virtual reality system can be flexibly used, and the user experience is improved.
Drawings
Fig. 1 is a flowchart of a method for wirelessly transmitting virtual reality positioning data according to an embodiment of the present invention;
fig. 2 is a timing chart of data transmission of each wireless camera device in the method for wirelessly transmitting virtual reality positioning data according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a system for wirelessly transmitting virtual reality positioning data according to an embodiment of the present invention.
Detailed Description
The design concept of the invention is as follows: the wireless communication module is arranged on the virtual reality helmet and is in wireless connection with each wireless camera device, the frequency band of the wireless camera device is divided into equal time slices, and each wireless camera device is communicated with the wireless communication module in one time slice in sequence, so that the low-delay transmission of the virtual reality positioning data is realized in a wireless mode.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for wirelessly transmitting virtual reality positioning data according to an embodiment of the present invention; fig. 2 is a timing chart of data transmission of each wireless camera device in the method for wirelessly transmitting virtual reality positioning data according to the embodiment of the present invention. With reference to fig. 1 and fig. 2, a method for wirelessly transmitting virtual reality positioning data according to an embodiment of the present invention includes:
step S110: a wireless communication module is arranged on the virtual reality helmet.
Because many virtual reality helmets only possess the function of broadcast audio frequency and video at present, can not compatible wireless camera equipment, function extension equipment such as wireless handle controller, consequently in step S110, set up wireless communication module on the virtual reality helmet, utilize wireless communication module and wireless camera equipment to pair to be connected, data transmission who receives from wireless camera equipment gives the virtual reality helmet again, the communication problem of virtual reality helmet and wireless camera equipment has been solved, and adopt wireless mode to connect, the user can use the virtual reality system in a flexible way, not bound by the wire rod, user experience has been improved.
Step S120: a plurality of wireless camera devices are arranged around the space where the virtual reality helmet is located, and each wireless camera device is wirelessly connected to the wireless communication module.
At least two wireless camera devices are needed to acquire the position information of the virtual reality helmet. The plurality of wireless devices are arranged around the space where the virtual reality helmet is located, so that at least two or more wireless camera devices can capture the virtual reality helmet simultaneously when a user moves, the positioning accuracy is guaranteed, but the wireless camera devices cannot be set too much due to the limitation of the bandwidth of the wireless communication module and the limitation of data transmission delay, therefore, in the preferred embodiment of the invention, 4 wireless camera devices are arranged, and all the wireless camera devices are located at the same height and located at 4 vertexes of a square respectively.
Step S130: and controlling the wireless communication module to sequentially transmit the same periodic square wave signals to each wireless camera device by adopting the same frequency band according to a preset time interval.
Currently, wifi and other wireless communication schemes generally employ frequency division multiple access technology to split an available frequency bandwidth into subchannels with narrower bandwidths, where each subchannel is independent of other subchannels. In order to avoid mutual interference between adjacent sub-channels, the adjacent sub-channels must be separated by a certain frequency band, and the frequency band used for separating the sub-channels cannot be used for transmitting data, thereby causing waste of bandwidth; when a device does not transmit data temporarily, the sub-channel connected to the device is in an idle state, and other devices cannot utilize the idle channel, so that the bandwidth utilization rate is not high in this way. The wireless communication schemes such as bluetooth generally adopt a frequency hopping technology, and data is sequentially transmitted on a plurality of frequency points according to a specific sequence, so that external interference and multipath fading can be effectively reduced. In the frequency hopping technology, each transmitted data packet is collated, if the data packet is damaged, the data packet is not used, and then the data packet is transmitted by using the next frequency point, so that the transmission speed is slow by adopting the frequency hopping technology, and the data transmission delay is increased by frequent frequency hopping.
Therefore, in order to fully utilize the bandwidth and meet the requirement of the virtual reality system for the delay of the transmission of the positioning data, in step S130, the channel of the wireless communication module is divided into equal-length time slices, and the equal-length time slices are respectively communicated with each wireless camera device according to a certain sequence. Compared with the frequency division multiple access technology, in step S130, each device uses the entire channel for communication when transmitting data, and the entire channel does not need to be split into multiple independent sub-channels with narrower bandwidths, and thus some frequency bands do not need to be wasted for spacing the sub-channels. In a time period when one wireless image pickup device temporarily does not transmit data, other wireless image pickup devices can transmit data by using the channel, so that the utilization rate of the bandwidth is higher. Compared with the frequency hopping technology, step S130 does not need to check the transmitted data packet, and does not increase the data transmission delay due to frequent frequency hopping, so the data transmission delay is shorter.
Step S140: and controlling each wireless camera device to send positioning data to the wireless communication module at the moment corresponding to the rising edge and the falling edge of the received square wave signal.
Because each wireless camera device is connected to the same channel of the wireless communication module, if two or more wireless camera devices transmit data at the same time, interference occurs, and therefore, the wireless camera devices need to be controlled to respectively transmit data according to a certain sequence, and after one wireless camera device finishes transmitting, the other wireless camera device starts transmitting, so that mutual interference between adjacent wireless camera devices is avoided.
The wireless communication module is controlled to sequentially send the same periodic square wave signals to each wireless camera device according to the preset time interval by adopting the same frequency band, each wireless camera device sends positioning data to the wireless communication module at the moment corresponding to the rising edge and the falling edge of the received square wave signals, the time interval of starting sending data of two adjacent wireless camera devices can be controlled, the interval is adjusted to be larger than the time required by one wireless camera device to send data, and interference between the adjacent wireless camera devices can be prevented.
For example, in fig. 2, four wireless image capturing devices sequentially transmit a part of the data material 1 at the first rising edge of the square wave, and the time intervals at which adjacent wireless image capturing devices receive the rising edge of the square wave are controlled to be the same, which are t 1; since the amount of data transmitted by each wireless image pickup apparatus is the same, the time required for each data transmission is the same, t 2; when t1> t2, when one wireless image pickup apparatus starts to transmit data, the previous wireless image pickup apparatus has already transmitted, and therefore, mutual interference does not occur.
Step S150: and controlling the wireless communication module to send the received positioning data of all the wireless camera devices to the virtual reality helmet at the moment corresponding to the next rising edge or falling edge of the square wave signal.
Still as shown in fig. 2, the four wireless camera devices sequentially transmit a part of the data 1 when receiving the first rising edge of the square wave, the wireless communication module stores the data into the register after receiving the data, and the data transmitted by the four wireless camera devices form the complete data 1. When the wireless communication module sends the second rising edge of the square wave, the data 1 sent by the four wireless camera devices are already stored in the register, so that the complete data 1 stored in the register can be transmitted to the virtual reality helmet at the moment corresponding to the second rising edge of the square wave sent by the wireless communication module. In fact, when the wireless communication module sends the first falling edge of the square wave, the previously received positioning data may also be sent to the virtual reality helmet, however, the time corresponding to the first falling edge of the square wave sent by the wireless communication module is too close to the time when the fourth wireless camera device starts sending data (i.e., the time corresponding to the first rising edge of the square wave received by the fourth wireless camera device), it is difficult to ensure that the wireless communication module has completed receiving and writing operations of all data, and the data sent to the virtual reality helmet is probably incomplete. Therefore, in a preferred embodiment of the present invention, at a time corresponding to the second rising edge of the square wave sent by the wireless communication module, the positioning data sent by each wireless camera device at a time corresponding to the first rising edge of the square wave is sent to the virtual reality helmet.
Preferably, the square wave signal has a period of 6ms and a high level duration of 3 ms, and since data is transmitted on both the rising edge and the falling edge, the frequency of data transmission can reach 333 Hz. At a certain moment, the wireless communication module sends a rising edge (or a falling edge) of a square wave to each wireless camera device, the first wireless camera device receives the rising edge (or the falling edge) and starts to send data, then other wireless camera devices send data in sequence, when the wireless communication module sends the next rising edge (or the falling edge) of the square wave to each wireless camera device, positioning data sent by the four wireless camera devices are sent to the virtual reality helmet, and the time interval of sending the two rising edges (or the falling edges) by the wireless communication module is just one period of the square wave signal and is 6 ms; and the time interval from the start of data transmission (i.e. the start of transmission by the first wireless camera device) to the reception of the data by the virtual reality helmet (i.e. the control of the wireless communication module to transmit the received positioning data of all the wireless camera devices to the virtual reality helmet) is shorter than the time interval of the wireless communication module to transmit two rising edges (or falling edges), so the data transmission delay is less than 6 ms.
As also shown in fig. 2, in one period of the square wave, for example, in the first period of the square wave of the first wireless image pickup apparatus, four wireless image pickup apparatuses each transmit data twice, so at least 8 equal time periods are included in one period of 6ms for each wireless image pickup apparatus to transmit data, that is, the time for one wireless image pickup apparatus to transmit data once must be less than one eighth of the period of the square wave and less than 750 milliseconds. In a preferred embodiment, one wireless camera device transmits 16 bytes of positioning data at a time, the time interval of receiving the same rising edge of the square wave by four wireless camera devices is controlled to be 250 microseconds, one wireless camera device can finish transmitting 16 bytes of positioning data within 250 microseconds, the rising edge interval of the square wave received by the fourth wireless camera device and the rising edge interval of the square wave received by the first wireless camera device are 750 microseconds, and the falling edge interval of the square wave received by the first wireless camera device is 2250 microseconds, and the data transmission of the fourth wireless camera device can be finished without affecting the next data transmission of the first wireless camera device. In the preferred embodiment, the data transmission frequency of the whole system can reach 333Hz, and the delay time is less than 6ms, so that the high requirement of the virtual reality system on the transmission delay of the positioning data can be completely met.
Fig. 3 is a schematic structural diagram of a system for wirelessly transmitting virtual reality positioning data according to an embodiment of the present invention. As shown in fig. 3, the system for wirelessly transmitting virtual reality positioning data provided by the present invention includes a wireless communication module 320 disposed on a virtual reality helmet 310, and a plurality of wireless camera devices 330 disposed around a space where the virtual reality helmet 320 is located. In a preferred embodiment, 4 wireless camera devices are arranged, and each wireless camera device is located at the same height and respectively located at 4 vertexes of a square, so that at least two or more wireless camera devices can capture a virtual reality helmet when a user moves, and the positioning accuracy is guaranteed.
Each wireless camera device 330 is wirelessly connected to the wireless communication module 320, and the wireless communication module 320 sequentially transmits the same periodic square wave signal to each wireless camera device 330 at predetermined time intervals and using the same frequency band. Since frequency division multiple access causes bandwidth waste, and the slow transmission speed of frequency hopping data increases data transmission delay, the present invention uses a time-sharing method to communicate the wireless communication module with each wireless camera device, and compared with the frequency division multiple access technology, each wireless camera device 330 uses the whole channel for communication when transmitting data, and does not need to split the whole channel into a plurality of independent sub-channels with narrower bandwidth, and also does not need to waste some frequency bands for spacing the sub-channels. In a period in which one wireless imaging apparatus 330 temporarily does not transmit data, the other wireless imaging apparatuses 330 can transmit data using the channel, and thus the bandwidth utilization rate is higher. Compared with the frequency hopping technology, the data transmission delay is not increased due to frequent frequency hopping without correcting the transmitted data packet, so that the data transmission delay is shorter.
Each wireless image pickup apparatus 330 transmits positioning data to the wireless communication module 320 at timings corresponding to the rising edge and the falling edge of the received square wave signal. By controlling the time interval of receiving the square wave signal by two adjacent wireless camera devices, the time interval can be made larger than the time required by one wireless camera device to transmit data, and interference between the adjacent wireless camera devices can be prevented.
At the time corresponding to the next rising edge of the square wave signal or the time corresponding to the next falling edge of the square wave signal, each wireless camera device has completed sending one data datum, and at this time, the wireless communication module 320 sends a received complete data datum of all the wireless camera devices 330 to the virtual reality helmet 310.
In a preferred embodiment of the invention, when the wireless camera device receives data sent by a rising edge of a square wave signal, the wireless communication module sends the data to the virtual reality helmet at a time corresponding to the next rising edge of the square wave signal; the wireless camera equipment receives data sent by the falling edge of the square wave signal, and the wireless communication module sends the data to the virtual reality helmet at the moment corresponding to the next falling edge of the square wave signal.
In fact, this approach can also be used: when the wireless camera equipment receives data sent by the rising edge of the square wave signal, the wireless communication module sends the data to the virtual reality helmet at the moment corresponding to the next falling edge of the square wave signal; the wireless camera device receives data sent by a falling edge of the square wave signal, the wireless communication module sends the data to the virtual reality helmet at a moment corresponding to a next rising edge of the square wave signal, the moment when the fourth wireless camera device starts sending the data is closer to the time when the wireless communication module sends the data to the virtual reality helmet, at the moment, it is difficult to ensure that the wireless communication module finishes receiving and writing operation of all data, and the data sent to the virtual reality helmet is probably incomplete, so that the method has higher requirements on errors of a system and higher technical difficulty.
In a preferred embodiment, the square wave signal has a period of 6ms and a high level duration of 3 ms, data is transmitted on both the rising and falling edges, and the frequency of data transmission can reach 333 Hz. The period of the square wave signal is 6ms, the time from the first wireless camera equipment sending a data material to the wireless communication module receiving the data material is less than one period of the square wave signal, and the data transmission delay is less than 6ms, so that the high requirement of the virtual reality system on the transmission delay of the positioning data can be completely met. One wireless camera device transmits 16 bytes of positioning data at a time, so that the time interval of receiving the same rising edge of the square wave by four wireless camera devices is controlled to be 250 microseconds, one wireless camera device can finish transmitting 16 bytes of positioning data within 250 microseconds, and the interval can not exceed the period of the square wave signal.
In summary, compared with the prior art, the method and the system for wirelessly transmitting the virtual reality positioning data provided by the invention have the following beneficial effects:
through wireless communication module with each wireless camera device wireless connection to on the virtual reality helmet respectively, adopt same frequency channel to send the same periodic square wave signal to every wireless camera device in proper order according to time interval, every wireless camera device sends the positioning data at the moment that received square wave signal's rising edge and falling edge correspond, wireless communication module is at the moment that next rising edge or falling edge of square wave signal correspond, sends received positioning data for the virtual reality helmet. Compared with the frequency division multiple access technology, each wireless camera device 330 uses the entire channel for communication when transmitting data, and does not need to split the entire channel into a plurality of independent sub-channels with narrower bandwidths, and thus does not need to waste some frequency bands for spacing the sub-channels. In a period in which one wireless imaging apparatus 330 temporarily does not transmit data, the other wireless imaging apparatuses 330 can transmit data using the channel, and thus the bandwidth utilization rate is higher. Compared with the frequency hopping technology, the transmitted data packet does not need to be corrected, the data transmission delay cannot be increased due to frequent frequency hopping, the data transmission delay is shorter, the bandwidth of the wireless communication module is fully utilized, the data transmission delay is effectively reduced, the low-delay transmission of the virtual reality positioning data is realized in a wireless mode, the high requirement of the virtual reality system on the positioning data transmission delay is met, a user is not bound by wires, the virtual reality system can be flexibly used, and the user experience is improved.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A method of wirelessly transmitting virtual reality positioning data, the method comprising:
a wireless communication module is arranged on the virtual reality helmet;
a plurality of wireless camera devices are arranged around the space where the virtual reality helmet is located, at least two wireless camera devices are arranged, each wireless camera device is respectively and wirelessly connected to the wireless communication module, and each wireless camera device is connected to the same channel of the wireless communication module;
controlling the wireless communication module to sequentially send the same periodic square wave signals to each wireless camera device by adopting the same frequency band according to a preset time interval;
controlling each wireless camera device to send positioning data to the wireless communication module at the moment corresponding to the rising edge and the falling edge of the received square wave signal;
and controlling the wireless communication module to send the received positioning data of all the wireless camera devices to the virtual reality helmet at the moment corresponding to the next rising edge or falling edge of the square wave signal.
2. The method according to claim 1, wherein the wireless communication module wirelessly connects 4 wireless camera apparatuses.
3. The method of claim 2, wherein the period of the square wave signal is 6 milliseconds and the duration of the high level is 3 milliseconds.
4. The method of claim 3, wherein the predetermined time interval is 250 microseconds.
5. A system for wirelessly transmitting virtual reality positioning data is characterized by comprising a wireless communication module arranged on a virtual reality helmet and a plurality of wireless camera devices arranged around the space where the virtual reality helmet is located, wherein at least two wireless camera devices are arranged;
each wireless camera device is respectively connected to the wireless communication module in a wireless mode, each wireless camera device is connected to the same channel of the wireless communication module, and the wireless communication module sequentially sends the same periodic square wave signals to each wireless camera device by adopting the same frequency band according to a preset time interval;
each wireless camera device sends positioning data to the wireless communication module at the moment corresponding to the rising edge and the falling edge of the received square wave signal;
and the wireless communication module sends the received positioning data of all the wireless camera devices to the virtual reality helmet at the moment corresponding to the next rising edge or falling edge of the square wave signal.
6. The system of claim 5, wherein the wireless communication module wirelessly connects 4 wireless camera devices.
7. The system of claim 6, wherein the square wave signal has a period of 6 milliseconds and a duration of high level of 3 milliseconds.
8. The system of claim 7, wherein the predetermined time interval is 250 microseconds.
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