JP2006311519A - Communication system, information processor and information processing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To excellently reproduce received video data without being affected by a variation in a communication environment caused by noise or the like in wireless transmission/reception of video data. <P>SOLUTION: A monitoring system comprises a monitoring device with a built-in camera for photographing an object to be monitored, and an information processor for video output. The monitoring device is configured to perform wireless communication, and the information processor is configured to perform wireless communication with the monitoring device via a wireless communication device connected to the information processor. Furthermore, the monitoring device is configured to change a bit rate at which video data is generated from an input signal of the camera, and the information processor judges from an extent of deterioration caused by a video data transmission step whether or not a state of video data received from the monitoring device is excellent for reproduction processing (S250). If it is judged that the state is not excellent, the bit rate of the monitoring device is set low (S260), thereby excellently reproducing the video data. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication system including a terminal device connected to an imaging device and an information processing device capable of communicating with the terminal device.

  Conventionally, as a communication system, an information processing device receives video data generated by a terminal device incorporating a photographing device for photographing a monitoring target, reproduces the video data, and displays the video on a display device. What is output is known (see, for example, Patent Document 1).

  In this type of communication system, when the network traffic is large when video data is transmitted / received, reception delay of the video data occurs. Therefore, the frame rate of the video data is set according to the network traffic. .

Also, wired and wireless systems are known as communication systems, and wireless communication systems are known that automatically switch data transmission speeds by setting the modulation speed and modulation system according to the noise environment. (For example, refer to Patent Document 2).
JP 2003-163914 A JP 2002-290417 A

  However, in the conventional system, when video data is transmitted and received wirelessly, if the communication environment deteriorates due to noise or the like, the video data is lost during the transmission process, and the video data deteriorates. There is a problem that the video data cannot be reproduced. In other words, in the prior art, when transmitting and receiving video data, the frame rate and the like are set according to the network traffic, so it is sufficient to cope with the deterioration of received data due to noise generated during wireless communication. There was a problem that I could not do it.

  The present invention has been made in view of such problems, and when video data is transmitted and received by wireless communication, the video data reproduction process is favorably performed without being affected by fluctuations in the communication environment due to noise or the like. It aims at providing the technology that can be.

The communication system according to claim 1, which has been made to achieve the object,
A terminal device provided with wireless communication means connected to the imaging device;
An information processing device comprising wireless communication means capable of wireless communication with the terminal device;
A communication system comprising:
The terminal device
Generation that generates video data of a preset bit rate based on an input signal from the photographing apparatus, and sequentially transmits the generated video data to the information processing apparatus via the wireless communication unit built in the apparatus itself A transmission means;
A setting change unit that receives a setting command signal transmitted from the information processing device via the wireless communication unit built in the device and changes the setting value of the bit rate according to the received setting command signal;
With
The information processing apparatus includes:
Video data transmitted from the terminal device is received via the wireless communication means built in the device, the received video data is sequentially reproduced, and video based on the video data is output to a display device. Receiving and reproducing means;
Determining means for determining whether the state of the video data received by the receiving and reproducing means is good or bad;
When the determination means determines that the state is not good, a setting command signal instructing to decrease the set value of the bit rate is transmitted to the terminal device via the wireless communication means built in the device itself. Setting correction means to
It is characterized by providing.

The communication system according to claim 2 is:
If the setting correcting means determines that the state is not good by the determining means, a setting for instructing to decrease the set value of the bit rate until the determining means determines that the state is good. The command signal is transmitted to the terminal device step by step.

The communication system according to claim 3 is:
In the information processing apparatus,
If the bit rate setting is not changed in the terminal device and the determination unit continues to determine that the state is good for a predetermined time, the bit rate setting value does not exceed the initial value. A setting restoration means for transmitting a setting command signal instructing to increase the terminal device to the terminal device via the wireless communication means built in the device itself;
Is provided.

The communication system according to claim 4 is:
The setting restoration unit continues to determine that the state is good by the determination unit for a predetermined time in a state where the bit rate setting is not changed in the terminal device, so that the transmission timing of the setting command signal is A configuration command signal for instructing the setting value of the bit rate to be increased by one step as the setting command signal via the wireless communication means built in the device itself. It is characterized by being made.

An information processing apparatus according to claim 5 is:
An information processing apparatus provided with a wireless communication means capable of wireless communication with a terminal device provided with a wireless communication means connected to the photographing apparatus,
The terminal device
Generation that generates video data of a preset bit rate based on an input signal from the photographing apparatus, and sequentially transmits the generated video data to the information processing apparatus via the wireless communication unit built in the apparatus itself A transmission means;
A setting change unit that receives a setting command signal transmitted from the information processing device via the wireless communication unit built in the device and changes the setting value of the bit rate according to the received setting command signal;
With
The information processing apparatus
Video data transmitted from the terminal device is received via the wireless communication means built in the device, the received video data is sequentially reproduced, and video based on the video data is output to a display device. Receiving and reproducing means;
Determining means for determining whether the state of the video data received by the receiving and reproducing means is good or bad;
When the determination means determines that the state is not good, a setting command signal instructing to decrease the set value of the bit rate is transmitted to the terminal device via the wireless communication means built in the device itself. Setting correction means to
It is characterized by providing.

  The program according to claim 6 is a program for causing a computer to realize the functions as the reception / reproduction means, the determination means, and the setting correction means in the information processing apparatus according to claim 5. Features.

  In the communication system according to claim 1, as described above, whether the state of the video data received from the terminal device is good or bad is determined, and if the state is not good, the setting value of the bit rate in the terminal device is lowered. Since the terminal apparatus is controlled, the information processing apparatus on the receiving side can receive video data satisfactorily by adjusting the bit rate even when the communication environment is deteriorated due to noise or the like.

  As is well known, in the wireless communication system, data communication that has failed due to noise or the like is supplemented by data retransmission or the like. However, when the communication environment is greatly deteriorated due to noise or the like, if there is a lot of data to be received originally, retransmission processing is performed. Will not be in time. For this reason, when the communication environment deteriorates due to noise or the like, normal video data cannot be received by the playback time, and playback processing is performed in a state where a part of the video data is missing, which is good. Video display is not possible.

  However, in the present invention, the amount of video data to be received is reduced by lowering the bit rate of the video data, so that data loss can be suppressed even if the communication environment deteriorates.

  Therefore, according to the present invention, it is possible to satisfactorily perform video data reproduction processing without being affected by fluctuations in the communication environment due to communication noise or the like, and to output a good video to the display device. Specifically, the determination means can be configured to analyze the received video data and determine the quality of the video data based on the degree of deterioration in the video data transmission process. The bit rate can be lowered by changing the quantization bit, the data compression rate, the number of frames per second, the frame size, and the like.

  In the above communication system, if the determination means determines that the state of the received data is not good, the bit rate may be immediately decreased to the minimum value. However, if the bit rate is immediately decreased to the minimum value, it is necessary. As described above, there is a possibility that the quality of the reproduced video is deteriorated. Therefore, as described in claim 2, a configuration for lowering the bit rate setting value stepwise may be introduced into the communication system.

  If the setting value of the bit rate is lowered step by step as in the communication system according to claim 2, it is possible to achieve a good reproduction process by reducing the bit rate reduction amount to the necessary minimum. . Therefore, according to this communication system, when the determination unit determines that the above state is not good, it is possible to output video with better image quality to the display device than immediately reducing the bit rate to the minimum value. .

  The setting correction means is determined to be in good condition if the determination means determines that the above state is not good, on the assumption that the terminal device is configured to be able to set the bit rate in multiple stages. Up to this point, a configuration command signal for instructing to lower the bit rate setting value by one step can be continuously transmitted to the terminal device.

  In addition, as in the communication system according to the third aspect, it is convenient to introduce a configuration for increasing the bit rate once lowered according to the state of received data. If the determination means determines that the state is good for a predetermined time with the bit rate fixed, the communication environment may be recovered due to the disappearance of noise or the like. By controlling the bit rate to be increased when the video data is in a good state, the video can be output to the display device with a good image quality when the communication environment is good.

  However, when the bit rate is increased, if the set value is suddenly returned to the original initial value, the reception state deteriorates again, and it is necessary to lower the set value of the bit rate. There is a possibility that the period during which data cannot be received becomes longer. Therefore, the setting restoring means may be configured as described in claim 4.

  In the communication system according to claim 4, the set value of the bit rate is increased step by step whenever a predetermined time elapses in a state where the video data can be satisfactorily received. An appropriate bit rate can be set in the terminal device.

  According to the information processing apparatus of the fifth aspect, since the bit rate of the terminal device is changed according to the state of the reception data, the video data can be reproduced satisfactorily. In addition, according to the program described in claim 6, the same effect as that of the invention described in claim 5 can be obtained. In this program, a program for causing a computer to realize the function as the setting restoring means described in claim 3 can be incorporated.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing the configuration of a monitoring system 1 to which the present invention is applied.
The monitoring system 1 according to the present embodiment includes a monitoring device 10 that captures a monitoring target, an information processing device 30 for video output, a wireless communication device 50 connected to the information processing device 30 via a communication cable LN, Consists of.

  The monitoring apparatus 10 includes a camera 11 that captures an object to be monitored, a digital conversion unit 13 that converts an analog video signal input from the camera 11 into digital video data as digital data, and a control that includes a microcomputer. Unit 15 and a wireless communication circuit unit 17 capable of wireless communication with the wireless communication device 50 connected to the information processing device 30.

  The control unit 15 generates transmission data storing the digital video data input from the digital conversion unit 13 and the transmission destination information describing the address of the information processing device 30, and sends the transmission data to the wireless communication circuit unit 17. The wireless communication circuit unit 17 has a transmission control unit 15a to input, and outputs a wireless signal on which transmission data input from the transmission control unit 15a is superimposed from an antenna. Note that the well-known IEEE 802.11x standard can be adopted as the wireless communication standard, and the Internet protocol can be adopted as the communication protocol.

  On the other hand, the digital conversion unit 13 encodes an input signal from the camera 11 by a well-known MPEG (Moving Picture Expert Group) method, and generates and outputs digital video data having a predetermined frame size (resolution). The digital conversion unit 13 is configured to be able to change the bit rate (so-called encoding bit rate), and is controlled by the control unit 15 at a bit rate corresponding to the image quality setting value set in the setting unit 13a. The input signal from is encoded, and the digital video data is generated and output. Specifically, the digital conversion unit 13 of this embodiment takes five levels of values “1” to “5” as image quality setting values, and the higher the image quality setting value, the higher the bit rate digital video data. Is generated.

  FIG. 2 is an explanatory diagram showing the relationship between the image quality setting value and the bit rate in this embodiment. When the image quality setting value is “1”, the digital conversion unit 13 according to the present embodiment generates kbps digital video data (for example, A = 64 can be cited as the variable A), and the image quality setting value. When the image quality setting value is “2”, 2 kbps digital video data having a bit rate double that of the image quality setting value “1” is generated, and when the image quality setting value is “5”, 16 kbps is generated. Generate digital video data.

  Further, the change of the image quality setting value by the control unit 15 is realized by an image quality switching process executed by the control unit 15 in the monitoring device 10. FIG. 3 is a flowchart showing image quality switching processing repeatedly executed by the control unit 15.

  When the image quality switching process is started, the control unit 15 waits until a setting command for instructing to change the image quality setting value is received from the information processing device 30 via the wireless communication circuit unit 17 (S110). When the command is received, the image quality designation value attached to the setting command is interpreted, and the image quality setting value of the setting unit 13a is changed to the same value as the image quality designation value attached to the setting command (S120). Thereafter, the control unit 15 transmits a response signal indicating that the setting change is completed to the setting command transmission source device (information processing device 30) via the wireless communication circuit unit 17 (S130), and the image quality switching process. Is temporarily terminated. Thereafter, the process proceeds to S110 again.

  On the other hand, the information processing device 30 is connected to the wireless communication device 50 capable of wireless communication with the monitoring device 10 and performs various arithmetic processes according to the interface 31 capable of communicating with the monitoring device 10 via the wireless communication device 50 and a program. CPU 33, RAM 35 used as a work area when the program is executed by CPU 33, ROM 37 for storing a boot program, a hard disk device 39, a display unit 41 including a liquid crystal display, and an input unit including a keyboard and a pointing device 43.

  In addition, the information processing apparatus 30 causes the hard disk device 39 to cause the CPU 33 to execute a video reception display process described later, a program for causing the CPU 33 to function as a timer, and an image quality setting value designated by the user. The setting information for the monitoring device 10 in which the initial value is described is stored.

  FIG. 4 is a flowchart showing video reception display processing executed by the CPU 33. When the execution instruction of the video reception display process is input from the input unit 43, the CPU 33 reads the corresponding program from the hard disk device 39, and executes the video reception display process shown in FIG. 4 according to the program.

  When the video reception display process is started, the CPU 33 first resets the image quality change counter CNT indicating the number of times of changing the image quality setting value (ie, sets CNT = 0) in S210, and then sets the monitoring device in S220. 10 is initialized. Specifically, in accordance with the setting information stored in the hard disk device 39, a setting command attached with an initial value indicated by the setting information as an image quality designation value is sent to the monitoring device 10 via the interface 31 and the wireless communication device 50. The initial value is set as the image quality setting value in the setting unit 13a of the digital conversion unit 13. When the image quality setting for the monitoring apparatus 10 is completed, the image quality setting value set in the setting unit 13a at that time is stored in the RAM 35 as the current image quality setting value N.

  When the processing in S220 is completed, the CPU 33 receives the digital video data transmitted from the monitoring device 10 via the wireless communication device 50 and the interface 31 (S230), and performs digital processing for a predetermined amount or a predetermined period. When the video data is received, the received data is analyzed (S240), and it is determined according to a predetermined standard whether or not the received data is in a good state for reproduction processing (S250).

  Specifically, when the amount of missing data (packets) in the received digital video data is greater than or equal to a predetermined amount, it is determined that the received data is not in good condition, otherwise, the received data Is determined to be in a good state. The detailed determination criteria can be arbitrarily set by the designer. In this embodiment, however, the degree of deterioration in the transmission process of digital video data (received data) based on the received data (specifically, data (packet) ) The degree of omission) is investigated, and a determination is made as to whether the state of the received data is “good” or “not good”.

  If it is determined that the state of the received data is not good (No in S250), the CPU 33 proceeds to S260 and executes the image quality reduction processing shown in FIG. FIG. 5 is a flowchart showing the image quality reduction processing executed by the CPU 33.

  When the image quality reduction processing is started, the CPU 33 determines whether or not the current image quality setting value N is the lowest value (that is, the value “1”) (S310), and the current image quality setting value N is the lowest value. (Yes in S310), the image quality reduction process ends. On the other hand, if it is determined that the current image quality setting value N is not the lowest value (No in S310), the process proceeds to S320.

  In step S320, the CPU 33 sends a setting command having a value N-1 smaller than the current image quality setting value N as an image quality designation value to the monitoring device 10 via the interface 31 and the wireless communication device 50. As a result, an image quality setting value N-1 that is one step smaller than the current image quality setting value N (in other words, a bit rate that is one step lower) is set in the setting unit 13a of the monitoring apparatus 10. After receiving the response signal indicating that the setting change is completed, the process proceeds to S330, and the updated image quality setting value N-1 is stored as the current image quality setting value N (N ← N-1).

  When the processing in S330 is completed, the CPU 33 proceeds to S340, adds 1 to the image quality change counter CNT (CNT ← CNT + 1), and then sets the timer so that the time is counted for a predetermined time T0. The countdown for time T0 is started (S350). Thereafter, the image quality reduction process ends.

  When the image quality reduction processing is completed in S260, the CPU 33 proceeds to S295 and determines whether or not an instruction to end the video reception display processing is input from the user through the input unit 43. If it is determined that an end instruction is input (Yes in S295), the video reception display process is terminated. If it is determined that an end instruction is not input (No in S295), the process proceeds to S230 for monitoring. The subsequent digital video data transmitted from the device 10 is received via the wireless communication device 50 and the interface 31, and the processes after S240 are executed.

  If it is determined in S250 that the state of the received data is good (Yes in S250), the CPU 33 reproduces the received digital video data and uses this digital video data as a reproduction signal for display unit input. This is converted and input to the display unit 41, and an image based on the digital image data is output to the display unit 41 (S270).

  When the process in S270 is completed, the CPU 33 determines whether or not the image quality change counter CNT is zero (S280). If the CPU 33 determines that the image quality change counter CNT is zero (Yes in S280), the process proceeds to S295. If it is determined that the image quality change counter CNT is not zero (No in S280), the process proceeds to S285. In this embodiment, the image quality change counter CNT is incremented by 1 every time the image quality setting value is lowered by one step in the low image quality reduction processing, and the image quality setting value is increased by one step in the image quality improvement processing described later. Furthermore, since the image quality change counter CNT is decremented by 1, when the image quality change counter CNT is zero, the image quality setting value of the setting unit 13a in the monitoring apparatus 10 matches the initial value set in S220.

  In S285, the CPU 33 determines whether or not the timer value is zero, and determines that the timer value is not zero (that is, the timer value is greater than zero) (No in S285). Since the predetermined time T0 has not elapsed since the image quality setting value was changed for the monitoring device 10, the process proceeds to S295. On the other hand, if it is determined that the timer value is zero (Yes in S285), assuming that the predetermined time T0 has elapsed since the last change of the image quality setting value for the monitoring apparatus 10, the process proceeds to S290 and is shown in FIG. Perform high image quality processing. FIG. 6 is a flowchart showing the image quality improvement processing executed by the CPU 33.

  When the image quality enhancement processing is started, the CPU 33 transmits a setting command with a value N + 1 that is 1 larger than the current image quality setting value N as an image quality designation value to the monitoring device 10 via the interface 31 and the wireless communication device 50. As a result, the setting unit 13a of the monitoring apparatus 10 is set with an image quality setting value N + 1 that is one step larger than the current image quality setting value N (in other words, a bit rate that is one step higher) (S410). After receiving the response signal indicating that the setting change is completed, the process proceeds to S420, and the updated image quality setting value N + 1 is stored in the RAM 35 as the current image quality setting value N (N ← N + 1).

  When the processing in S420 is completed, the CPU 33 proceeds to S430, decrements the image quality change counter CNT by 1 (CNT ← CNT-1), and then sets a timer so as to count for a predetermined time T0. The timer is caused to start counting down for time T0 (S440). Thereafter, the image quality enhancement process is terminated.

  Thus, when the process in S290 is completed, the CPU 33 proceeds to S295. If the end instruction is not input (No in S295), the process proceeds to S230. If the end instruction is input (Yes in S295), the video reception display process is ended.

  Although the monitoring system 1 of the present embodiment has been described above, in this monitoring system 1, the monitoring device 10 including the camera 11 as a photographing device is set in the image quality setting set in the setting unit 13a by the digital conversion unit 13. The input signal from the camera 11 is encoded at a bit rate corresponding to the value to generate digital video data, and the digital video data is sequentially transmitted to the wireless communication circuit unit 17 (the terminal of the present invention) by the transmission control unit 15a. The information is transmitted to the information processing apparatus 30 via a wireless communication unit incorporated in the apparatus.

  In addition, the monitoring device 10 performs image quality switching processing in the control unit 15 and sends a setting command (corresponding to a setting command signal of the present invention) transmitted from the information processing device 30 via the wireless communication circuit unit 17. Received (S110), sets the image quality in the setting unit 13a according to the image quality designation value attached to the received setting command, and changes the bit rate (S120).

  Further, the information processing apparatus 30 receives the digital video data transmitted from the monitoring apparatus 10 via a wireless communication apparatus 50 (corresponding to a wireless communication means built in the information processing apparatus of the present invention) connected to the information processing apparatus 30. (S230) The received digital video data is sequentially reproduced and an image based on the digital video data is output to the display unit 41 (corresponding to the display device of the present invention) (S270).

  Further, the information processing apparatus 30 analyzes the received digital video data, determines the quality of the received digital video data based on the degree of deterioration in the transmission process of the received data (S250), and the state is not good. If it is determined (No in S250), the image quality reduction processing is repeatedly executed until it is determined that the state is good (S260), and a setting command for instructing to lower the image quality setting value by one level (1 from the current image quality setting value). A setting command with a small image quality designation value) is transmitted to the monitoring device 10 via the wireless communication device 50. As a result, the information processing apparatus 30 gradually decreases the bit rate of the digital video data transmitted from the monitoring apparatus 10 and reduces the amount of digital video data to be received.

  As described above, according to the monitoring system 1 of the present embodiment, even if the communication environment is deteriorated due to noise or the like, normal digital video data can be exchanged by lowering the bit rate. When executed, the video captured by the monitoring device 10 can be output to the display unit 41 appropriately at all times. In the monitoring system, it is important that the user can always monitor the monitoring target through the display unit 41. In this monitoring system 1, the constant monitoring can be realized without being affected by noise or the like. According to this, the performance of the system is improved.

  Further, according to the present embodiment, the bit rate is lowered step by step, so that the bit rate reduction range can be kept to the minimum necessary. Therefore, according to the present invention, when it is determined that the state of the received data is not good (No in S250), the video is output to the display unit 41 with better image quality than immediately when the bit rate is lowered to the minimum value. be able to.

  In addition, in this embodiment, every time the predetermined time T0 elapses, it is determined that the state of the received data is good (Yes in S250) without changing the bit rate setting in the monitoring device 10. (Yes in S285) As long as the current image quality setting value is less than the initial value (No in S280), the image quality improvement process is executed (S290), and a setting command (currently instructing to increase the image quality setting value by one level) Is sent to the monitoring device 10 via the wireless communication device 50. As a result, the information processing device 30 increases the bit rate of the digital video data transmitted from the monitoring device 10 stepwise within a range not exceeding the initial value, thereby improving the image quality at the time of video output.

  If it is determined that the state of the received data is good for a predetermined time T0 with the bit rate fixed, the communication environment may be recovered, so if the bit rate is adjusted as described above, When the communication environment is good, the video can be output to the display unit 41 with good image quality. Therefore, according to the present embodiment, it is possible to set an appropriate bit rate according to the communication environment, execute the reproduction process satisfactorily, and appropriately output the monitoring video to the display unit 41.

  The terminal device of the present invention corresponds to the internal circuit of the monitoring device 10 excluding the camera 11 of the present embodiment, and the information processing device of the present invention corresponds to the wireless communication device 50 and the information processing device 30. The generation / transmission means corresponds to the digital conversion unit 13 and the transmission control unit 15a, and the setting change means is realized by image quality switching processing. In addition, the receiving / reproducing means is realized by the processes of S230 and S270, the determining means is realized by the processes of S240 and S250, and the setting correcting means is realized by the low image quality processing (S260), and the setting restoring means. Is realized by S280, S285, and high image quality processing (S290).

In addition, the communication system, the information processing apparatus, and the program of the present invention are not limited to the above-described embodiments, and can take various forms.
For example, in the above embodiment, the monitoring system 1 is configured to decrease the bit rate step by step every time it is determined that the state of the received data is not good, but when it is determined that the state of the received data is not good Alternatively, the state of the received data may be digitized, the bit rate reduction range may be determined according to the numeric value, and the bit rate according to the numeric value may be set in the monitoring apparatus 10.

  In the above embodiment, the change in the bit rate may be realized by changing the data compression rate, the change in the number of frames per second, or the change in the frame size. Also good. In addition, although the example which applied this invention to the monitoring system was demonstrated in the said Example, this invention is not limited to a monitoring system, It can apply to another communication system.

It is explanatory drawing showing the structure of the monitoring system 1 to which this invention was applied. It is explanatory drawing which showed the relationship between an image quality setting value and a bit rate. It is a flowchart showing the image quality switching process which the control part 15 performs repeatedly. It is a flowchart showing the image | video reception display process which CPU33 performs. It is a flowchart showing the image quality reduction process which CPU33 performs. It is a flowchart showing the image quality improvement process which CPU33 performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Monitoring system, 10 ... Monitoring apparatus, 11 ... Camera, 13 ... Digital conversion part, 13a ... Setting part, 15 ... Control part, 15a ... Transmission control part, 17 ... Wireless communication circuit part, 30 ... Information processing apparatus, 31 ... Interface, 33 ... CPU, 35 ... RAM, 37 ... ROM, 39 ... Hard disk device, 41 ... Display unit, 43 ... Input unit, 50 ... Wireless communication device

Claims (6)

A terminal device provided with wireless communication means connected to the imaging device;
An information processing device comprising wireless communication means capable of wireless communication with the terminal device;
A communication system comprising:
The terminal device
Generation that generates video data of a preset bit rate based on an input signal from the photographing apparatus, and sequentially transmits the generated video data to the information processing apparatus via the wireless communication unit built in the apparatus itself A transmission means;
A setting change unit that receives a setting command signal transmitted from the information processing device via the wireless communication unit built in the device and changes the setting value of the bit rate according to the received setting command signal;
With
The information processing apparatus includes:
Video data transmitted from the terminal device is received via the wireless communication means built in the device, the received video data is sequentially reproduced, and video based on the video data is output to a display device. Receiving and reproducing means;
Determining means for determining whether the state of the video data received by the receiving and reproducing means is good or bad;
When the determination means determines that the state is not good, a setting command signal instructing to decrease the set value of the bit rate is transmitted to the terminal device via the wireless communication means built in the device itself. Setting correction means to
A communication system comprising:   The setting correcting means, when the determining means determines that the state is not good, a setting for instructing to decrease the set value of the bit rate until the determining means determines that the state is good The communication system according to claim 1, wherein the command signal is configured to be transmitted to the terminal device step by step. In the information processing apparatus,
If the bit rate setting is not changed in the terminal device and the determination unit continues to determine that the state is good for a predetermined time, the bit rate setting value does not exceed the initial value. A setting restoration means for transmitting a setting command signal instructing to increase the terminal device to the terminal device via the wireless communication means built in the device itself;
The communication system according to claim 1, wherein a communication system is provided.   The setting restoring means continues to determine that the state is good by the determination means for a predetermined time without changing the bit rate setting in the terminal device, so that the transmission timing of the setting command signal is A configuration command signal for instructing the setting value of the bit rate to be increased by one step as the setting command signal via the wireless communication means built in the device itself. 4. The communication system according to claim 3, wherein the communication system is configured as described above. An information processing apparatus provided with a wireless communication means capable of wireless communication with a terminal device provided with a wireless communication means connected to the photographing apparatus,
The terminal device
Generation that generates video data of a preset bit rate based on an input signal from the photographing apparatus, and sequentially transmits the generated video data to the information processing apparatus via the wireless communication unit built in the apparatus itself A transmission means;
A setting change unit that receives a setting command signal transmitted from the information processing device via the wireless communication unit built in the device and changes the setting value of the bit rate according to the received setting command signal;
With
The information processing apparatus
Video data transmitted from the terminal device is received via the wireless communication means built in the device, the received video data is sequentially reproduced, and video based on the video data is output to a display device. Receiving and reproducing means;
Determining means for determining whether the state of the video data received by the receiving and reproducing means is good or bad;
When the determination means determines that the state is not good, a setting command signal instructing to decrease the set value of the bit rate is transmitted to the terminal device via the wireless communication means built in the device itself. Setting correction means to
An information processing apparatus comprising: The program for making a computer implement | achieve the function as the said reception reproduction | regeneration means in the information processing apparatus of Claim 5, the said determination means, and the said setting correction means.

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