JP3197118B2 - Image transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image transmitting apparatus for encoding analog image data and analog audio data with high efficiency and transmitting the encoded data.

[0002]

2. Description of the Related Art FIG. 15 shows, for example, the TTC standard JT-standardized by the Electronic Telephone Technical Committee (hereinafter referred to as TTC).
H. FIG. 32 is a block diagram showing a conventional image transmission device shown in 320 “teleconference system terminal device”. In the figure, reference numeral 91 denotes a video for digitizing input analog image data and performing a conversion operation to a predetermined image format. A video input / output device 92 comprising an input unit and a video output unit for converting the digitized image data into analog image data. 92 is a video input / output device for efficiently encoding the image data input from the video input / output device 91. The video codec includes an encoding device and a video decoding device that restores encoded image data to data before encoding.

Reference numeral 93 denotes an audio input / output device for inputting / outputting audio data, and reference numeral 94 denotes an audio codec for encoding and decoding audio data input / output to / from the audio input / output device 93. Reference numeral 95 denotes a delay circuit that adjusts the time so that the audio data decoded by the audio codec 94 and the image data decoded by the video codec 92 match in time. Reference numeral 96 denotes a general-purpose data input / output device for inputting / outputting general-purpose data.

[0004] Further, reference numeral 97 denotes a demultiplexing control device (hereinafter, referred to as MUX / DMUX) for multiplexing / demultiplexing coded image data, audio data, general-purpose data, and control data.
Reference numeral 98 denotes a network interface device which is connected to the MUX / DMUX 97 and interfaces with a transmission line of a partner station which performs transmission and reception.

Reference numeral 99 denotes a telematic device connected to the MUX / DMUX 97, 100 denotes a system control device for controlling the entire system, and 101 denotes an end connected between the system control device 100 and the network interface device 98. Network signal control device.

Next, the operation will be described. First, the analog image data input to the video input device 91 is digitized, and the video codec 92 encodes the image data with high efficiency. The encoded image data is sent to the MUX / DMUX 97 and multiplexed.

On the other hand, audio data input from the audio input / output device 93 is also encoded by the audio codec 94. The audio coding algorithm is, for example, μ-law PCM
In general, several types such as SB-ADPCM and LD-CELP are supported, and can be properly used depending on user settings. The encoded audio data is sent to the MUX / DMUX 97 and multiplexed in the same manner as the image data.

The general-purpose data input from the general-purpose data input / output device 96 is sent to the MUX / DMUX 97 together with image data and audio data without being encoded, and is multiplexed.

[0009] The multiplex format is defined in the ITU-T Rec.
221 "6 in audiovisual teleservices
4 Kbps to 1920 Kbps channel frame structure ". In the MUX / DMUX 97, image data, audio data, etc. are stored in the ITU-T Rec. 221
Multiplexed into the multiplexed format specified in, and demultiplexed in reverse. FIG. 16 shows the TTC standard JT-H. FIG. 3 is a diagram showing a multiplex format at 64 Kbps specified by H.221.
In the figure, data transmission and reception are performed in units of 8 bits, and are managed by octet numbers from 1 to 80. The most significant bit of the 8-bit data is the bit data of the sub-channel # 1, and the least significant bit is the 1-bit data of the sub-channel # 8.

[0010] The least significant data of eight 8-bit data from octet 1 to octet 8 indicates control data for establishing frame synchronization, and is called FAS.
Further, the least significant data of the eight 8-bit data of octets 9 to 16 indicates control data for defining a demultiplexing pattern and the like, and is called BAS.

[0011] In this manner, when the transmission from the 8-bit data of octet 1 to the 8-bit data of octet 80 is repeated in order, 8 bits x 80 octets = 6
The FAS and the BAS are transmitted in units of 40 bits, and if this 640-bit data is transmitted in 10 milliseconds, the transmission will be exactly 64 Kbps.

On the other hand, in the receiving process, MUX / DMUX 9
7 detects the FAS, and notifies the system controller 100 when the FAS is detected. With this as a trigger, the system control device receives the BAS from the MUX / DMUX 97 and analyzes the BAS, thereby recognizing the multiplex format of the reception state, and also enables separation of audio data, image data, and general-purpose data. .

Incidentally, the BAS is used not only as a command indicating a multiplexed state but also as a command indicating the receiving capability of the apparatus. TTC standard JT-
H. According to 242, "method of setting communication between audiovisual terminals using digital channels up to 1920 Kbps", in order to perform simultaneous multiplex communication of images and sounds, BAS indicating capability is exchanged with each other. It is necessary that the initialization information exchange sequence for grasping the receiving capability of the other party ends normally. After the call connection is completed, the system controller 100 executes an initialization information exchange sequence, and as a result, determines a multiplex pattern. Such an operation is called negotiation.

A command indicating a multiplex pattern determined by negotiation is transmitted periodically using BAS. FIG. 17 shows the transmission and reception of the BAS. 171
In a case where the image transmission apparatus A indicated by and the image transmission apparatus B indicated by 173 are in opposite communication via the communication network 172, the transmission apparatus 175 notifies the MUX / DMUX 97 of the BAS,
The MUX / DMUX specifies the notified BAS as the specified BA.
Multiplex to S area. Then, the image data is transmitted to the image transmission device 173 which is the opposite communication partner device through the network interface 180 and the communication network 172. In the image transmission device 173, the MUX / DMUX 182
The BAS is separated and transmitted to the receiving device 176.

Similarly, the transmitting device 177 notifies the MUX / DMUX 182 of the BAS to be transmitted, and
The MUX 182 multiplexes the notified BAS into the specified BAS area. Then, the image data is transmitted to the image transmission apparatus 171 which is the opposite communication partner apparatus through the network interface 181 and the communication network 172. In the image transmitting device 171, the BAS is separated by the MUX / DMUX 179 through the network interface 180 and transmitted to the receiving device 174. As described above, since the transmitting device 175 and the transmitting device 177 perform BAS transmission independently of each other, the BAS is arbitrarily determined and transmitted by the opposite communication partner device regardless of the receiving device.

[0016]

In the conventional image transmission apparatus, when the transmitting apparatus of the opposite communication apparatus sets the multiplex pattern and determines the BAS irrespective of the receiving apparatus of the own station apparatus, the receiving apparatus cannot be properly separated. There were problems such as occurrence of.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and even if the opposite communication partner device specifies a multiplex pattern that cannot be separated by the receiving device, the opposite communication partner device can be specified by the correspondence of the receiving device. It is an object of the present invention to obtain an image transmission device capable of normalizing the multiplexing control.

[0018]

Means for Solving the Problems An image transmission apparatus according to a first aspect of the invention includes transmitting means for transmitting the multiplexed data by multiplexing the image data and audio data and control data, the counter communication
An image transmission apparatus having a receiving means for separating the image data and audio data and control data by receiving the multiplexed data sent from the communication apparatus, the receiving means receives
Control data indicating that separation is not possible
Check if the data exists, and confirm that
When there is control data indicating that
Multiplexing correction request to request multiplexing pattern correction
An image transmitting apparatus , comprising: a request generating unit that generates a request for transmitting a multiplexing request; and the transmitting unit includes a request transmitting unit that transmits a multiplexing correction request from a receiving unit to an opposite communication device.

In the image transmitting apparatus according to the second invention, the receiving means further includes a discriminating means for discriminating the opposite communication device from the separated control data, and operates the request generating means based on the discrimination result. 2. The method according to claim 1, wherein
The image transmission device as described in the above.

An image transmission apparatus according to a third aspect of the present invention has a configuration in which the image transmission apparatus has setting means for setting a unique communication control procedure. 2. The image transmission apparatus according to claim 1, wherein the format of the multiplexed data is changed to a unique format, and communication control is performed using the unique format.

An image transmission apparatus according to a fourth aspect of the invention is a combination of the image transmission apparatus according to the second aspect and the image transmission apparatus according to the third aspect.

[0022]

In the image transmission apparatus according to the first invention, the request generation means checks the multiplexed data sent from the other party in the reception means, and if there is an error, generates a correction request therefor, and the transmission means transmits the request. The means transmits the correction request to the partner device. Therefore, even when the receiving apparatus receives a multiplex pattern that cannot be separated, it is possible to notify the transmitting apparatus that the multiplex pattern is incorrect. When an error of the multiplex pattern is notified from the partner station apparatus during communication, the multiplex pattern and the BAS are returned to the state before the multiplex to correct the error.

The image transmission device according to the second invention is characterized in that
A case is considered in which the image transmission apparatus according to the invention cannot be performed unless the image transmission apparatus is a special apparatus, and a determination means for determining whether the opposite communication apparatus is the image transmission apparatus according to the first invention is provided. Accordingly, when the opposing communication device is the image transmission device according to the first invention, the above-described function is operated. When an error of the multiplex pattern is notified from the partner station apparatus during communication, the multiplex pattern and the BAS are returned to the state before the multiplex to correct the error.

The image transmission apparatus according to the third aspect of the present invention is provided with a setting switch and the like, and sets an original communication control procedure. Is going to go. For example, it becomes possible to request the opposite communication device to correct a multiplex pattern using unique control data.
When an error of the multiplex pattern is notified from the partner station apparatus during communication, the multiplex pattern and the BAS are returned to the state before the multiplex to correct the error.

An image transmission device according to a fourth aspect of the invention is a combination of the image transmission devices according to the second and third aspects. Therefore, the opposite communication device can be determined by the determination unit, and the unique communication control procedure can be set by the setting unit. If the opposing communication device is the image transmission device according to the first aspect of the invention and the opposing communication device similarly supports its own communication control procedure, the multiplex pattern can be corrected using the own communication control procedure. A request can be made to the communication device. When an error of the multiplex pattern is notified from the partner station apparatus during communication, the multiplex pattern and B
Return the AS to the state before multiplexing.

[0026]

[Embodiment 1] An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 91 denotes a video input unit for digitizing input analog image data and performing a conversion operation to a predetermined image format;
Conversely, a video input / output device comprising a video output unit for converting digitized image data into analog image data,
Reference numeral 92 denotes a video codec including a video encoding device that highly efficiently encodes image data input from the video input / output device 91 and a video decoding device that restores encoded image data to data before encoding.

Reference numeral 93 denotes an audio input / output device for inputting / outputting audio data, and reference numeral 94 denotes an audio codec for encoding and decoding audio data input / output to / from the audio input / output device 93. Reference numeral 95 denotes a delay circuit that adjusts the time so that the audio data decoded by the audio codec 94 and the image data decoded by the video codec 92 match in time.

Reference numeral 96 denotes a general-purpose data input / output device for inputting / outputting general-purpose data.

Reference numeral 97 denotes an apparatus for multiplexing / demultiplexing the encoded image data, audio data, and control data.
Reference numeral 98 denotes a network interface device which is connected to the MUX / DMUX 97 and interfaces with a transmission line of a partner station which performs transmission and reception.

Reference numeral 99 denotes a telematic device connected to the MUX / DMUX 97, and 100 denotes a system control device for controlling the entire system.

Reference numeral 101 denotes the system controller 10
0 and an end network signal control device connected between the network interface device 98.

A transmission controller 102 monitors the BAS output from the MUX / DMUX and executes an interconnection procedure. Reference numeral 102a denotes a correction request generation unit that checks the received multiplexed data and generates a correction request for requesting the opposite communication device to correct the multiplex pattern based on the check result. Reference numeral 102b denotes a correction request transmission unit that transmits the correction request generated by the correction request generation unit to the opposite communication device.

Next, the operation of the transmission control device 102 of the own station will be described with reference to the flowchart of FIG.

First, the present image transmission apparatus uses the TTC standard JT-
H. The connection procedure of 242 is performed, and at the time of the connection procedure, the BAS of the opposite communication partner device is analyzed (step ST21).

If the communication with the opposite communication partner apparatus is in progress (step ST22), the BAS of the other station transmitted cyclically is sequentially analyzed (step ST2).
3). At this time, a case will be described in which, for example, 9.6 Kbps general-purpose data multiplexing is designated during 56 Kbps voice multiplexing as shown in FIG. In this case, the respective multiplexing parts (the perspective parts in FIG. 3) overlap, and a part of the voice and the general-purpose data are multiplexed. However, the receiving side recognizes that the audio data is 56 Kbps by the BAS, and thus the overlapping portion is reproduced as noise.

The case of FIG. 3 will be described in more detail. In this case, the transmitting system multiplexes the data according to the multiplexed data pattern specified by the user and transmits the multiplexed data to the receiving side. When transmitting data as shown in FIG. 3, the transmitting side multiplexes voice data and general-purpose data in this order. Therefore, the area shaded in FIG. 3 is transmitted while being destroyed. Since the receiving side is based on the BAS that is sent cyclically to separate each data,
The voice data is separated while being partially destroyed by the general-purpose data, and can be recognized only as noise.

The transmitting side has no means for detecting even if the multiplexed data is destroyed in a multiplex pattern as shown in FIG. Therefore, the receiving side calculates from the BAS whether or not the total of all the multiplexed data is within the frame frame of 64 Kbps, and the total is 64 Kbps.
If it is within s, it is recognized as a multiplexable data pattern, and separation of each data is started. If the total exceeds 64 Kbps, the transmission side is notified of the transmission of an incorrect multiplex pattern by transmitting BAS and control data. That is, in this case, the audio data is 56 Kbp
s, since the general-purpose data is 9.6K, the data of a total of 65.6 Kbps is to be transmitted, so that the transmitting side is notified using the BAS and control data that an incorrect multiplex pattern is being transmitted. Then, at jp10, the transmission side deletes data that has little effect on the user even if the multiplex pattern is changed, and changes the multiplex pattern so as to fit within the 64 Kbps frame.

According to this method, it is possible to correct the occurrence of a multiplex pattern error while emphasizing the request from the user side. As described above, when there is a BAS indicating that separation is not possible (step ST24), the receiving device notifies its own transmitting device to perform a correcting operation on the opposite communication partner device (step ST25). Then, the own-station transmitting apparatus notifies the non-standard BAS arbitrarily set for correcting the multiplex pattern by transmitting the non-standard BAS to the opposite communication partner apparatus (step ST26). Where non-standard B
As the AS, a part indicated by a blank in Appendix A-1 / JTH 221 “Numerical Table of BAS” shown in the TTC standard higher layer protocol encoding method is used. Since the blank part is undefined, it can be used as a non-standard BAS.

FIG. 4 shows the operation of the partner station apparatus in response. Similarly, the TTC standard JT-H. The connection procedure of 242 is performed, and the BAS of the partner station apparatus is analyzed during the connection procedure (step ST41).

If the communication with the partner station is in progress (step ST42), the BAS of the partner station transmitted cyclically is sequentially analyzed (step ST43).
At that time, when the partner station apparatus detects an error in the multiplex pattern in the BAS and notifies the BAS of the error (step ST
44), and notifies its own transmitting device (step ST4).
5). Then, the local station transmitting apparatus returns the multiplex pattern and the BAS to the state before the multiplex to correct the multiplex pattern error caused by the multiplex pattern change (step ST4).
6).

As described above, this embodiment digitizes analog image data and performs a conversion operation of a predetermined image format, while a video input / output for converting digitized image data into analog image data. A device, a video codec for efficiently encoding image data input from the video input / output device, and restoring encoded image data to pre-encoding data, and digitizing analog audio data; Audio input / output device for converting encoded audio data into analog audio data, and audio for efficiently encoding audio data input from the audio input / output device, while restoring encoded audio data to pre-encoding data Codecs,
A demultiplexing control device that multiplexes the encoded image data, the encoded audio data, and the control data, and separates the multiplexed encoded image data, the encoded audio data, and the control data; A network interface device connected to the demultiplexing control device for interfacing with a transmission / reception partner; a transmission control device connected to the demultiplexing control device for performing an interconnection procedure with the transmission / reception partner;
An image transmission apparatus comprising a system control device for controlling the entire apparatus and realizing a multiplex format using control data separated from the demultiplexing control apparatus. It is characterized in that it can be performed from the receiving side of the device.

Embodiment 2 FIG. Next, a second embodiment will be described below.

FIG. 5 shows the configuration of the second embodiment. 91-10
Up to 2 is the same as in the first embodiment. A discriminating device 103 determines whether or not the device is equivalent to the own station.

Next, the operation will be described with reference to the flowchart of FIG.

First, the present image transmission apparatus uses the TTC standard JT-
H. The connection procedure of H.243 is performed, and at the time of the connection procedure, the BAS of the opposite communication partner device is analyzed (step ST61). If the model code of the other communication partner device obtained by the negotiation is the same as that of the own station communication device, the following non-standard communication control is performed (step ST6).
2).

Then, when the communication is being performed with the opposite communication partner device (step ST63), the BAS of the partner station transmitted cyclically is sequentially analyzed (step ST64). At this time, if there is a BAS indicating that separation is impossible as shown in the first embodiment (step ST65), the receiving apparatus transmits its own station in order to cause the opposite communication partner apparatus to perform a correction operation. The device is notified (step ST66).
The transmitting apparatus notifies the non-standard BAS arbitrarily set for correcting the multiplex pattern by transmitting the non-standard BAS to the opposite communication partner apparatus (step ST67). Also, when the model code of the other communication partner device obtained by the negotiation is that of another model, and communication is currently being performed (step ST
68), and perform a conventional standard operation (step ST6).
9).

FIG. 7 shows the operation of the opposing communication partner apparatus in response to this. Similarly, the TTC standard JT-H. The connection procedure of 242 is performed, and the BAS of the partner station apparatus is analyzed during the connection procedure (step ST71). If the model code of the partner station device obtained by the negotiation is the same as that of the own station device, the following communication control is performed (step ST72).

If communication is being performed with the partner station device (step ST73), the BAS of the partner station device that is cyclically transmitted is sequentially analyzed (step ST74).
At that time, the partner station device detects an error in the multiplex pattern,
When notified by AS (step ST75),
The transmission device of the own station is notified (step ST76), and the notified transmission device of the own station corrects the multiplex pattern error caused by the change of the multiplex pattern.
The AS is returned to the state before the multiplexing (step ST77). If the model code of the partner station device obtained by the negotiation is that of another model, and communication is currently being performed (step ST78), the conventional standard operation is performed (step ST79).

As described above, this embodiment digitizes analog image data and performs a conversion operation of a predetermined image format, while a video input / output for converting digitized image data into analog image data. A device, a video codec for efficiently encoding image data input from the video input / output device, and restoring encoded image data to pre-encoding data, and digitizing analog audio data; Audio input / output device for converting encoded audio data into analog audio data, and audio for efficiently encoding audio data input from the audio input / output device, while restoring encoded audio data to pre-encoding data Codecs,
A demultiplexing control device that multiplexes the encoded image data, the encoded audio data, and the control data, and separates the multiplexed encoded image data, the encoded audio data, and the control data; A network interface device connected to the demultiplexing control device and interfacing with a transmission / reception partner; a transmission control device connected to the demultiplexing control device and taking an interconnection procedure with the transmission / reception partner;
An image transmission apparatus having a system control apparatus for controlling the entire apparatus, comprising: means for recognizing an opposite communication partner apparatus and a model using control data separated from the demultiplexing control apparatus. In the case of a device and a model equivalent to the own station, it automatically shifts to a unique communication control procedure.

Embodiment 3 FIG. Next, a third embodiment will be described below.

FIG. 8 shows the configuration of the third embodiment. 91-10
Up to 2 is the same as in the first embodiment. Reference numeral 104 denotes a setting switch for changing the multiplex pattern to a unique format and performing communication control.

Next, the operation will be described with reference to the flowchart of FIG. When the setting switch 104 is set to the non-standard operation setting (step ST91), for example, FIG.
The multiplex pattern is changed so that octets 17 to 24 of sub-channel # 8 below the BAS area are reserved as the control data transmission area as shown by hatching in step 0 (step ST92).

Thereafter, when communication is in progress (step ST
93), the BAS of the opposite communication partner device transmitted cyclically is sequentially analyzed (step ST94). And a BAS indicating that separation is impossible as shown in the first embodiment.
Exists (step ST95), the receiving device notifies the transmitting device of the own station to cause the opposing communication partner device to perform the correcting operation (step ST96). The own-station transmitting device notifies the other-party communication device by transmitting control data arbitrarily set using the reserved area to the opposite communication partner device (step ST97). Here, BAS is not included in the control data (only the hatched portion in FIG. 10). Such control data is used because of its expandability. That is, when controlling the transmitting side from the receiving side, it is possible to point out concrete and easy points regarding the correction of the multiplex pattern and to flexibly provide support from the receiving side. If communication is in progress (step ST98) and it is determined that the model is another model based on the model code, a standard operation is performed (step S98).
T99).

FIG. 11 shows the operation of the opposite communication partner apparatus in response to this. If the setting is a non-standard operation (step ST111), the multiplex pattern is changed in the same manner as described above (step ST112).

Thereafter, when communication is being performed with the partner station device (step ST113), the control data of the partner station device transmitted by changing the multiplex pattern is sequentially analyzed (step ST114). At this time, when the partner station apparatus detects a multiplex pattern error in the BAS and notifies the BAS of control data set using the reserved area (step ST11).
5) Notify the transmitting device of the own station to enter the correction operation (step ST116). The own-station transmitting device that has been notified returns the multiplex pattern and the BAS to the state before the multiplex to correct the multiplex pattern error caused by the multiplex pattern change (step ST117). If the switch setting is set to non-standard and communication is in progress (step ST
118), and perform a standard operation (step ST119).

As described above, this embodiment digitizes analog image data and performs a conversion operation of a predetermined image format, while video input / output for converting digitized image data into analog image data. A device, a video codec for efficiently encoding image data input from the video input / output device, and restoring encoded image data to pre-encoding data, and digitizing analog audio data; Audio input / output device for converting encoded audio data into analog audio data, and audio for efficiently encoding audio data input from the audio input / output device, while restoring encoded audio data to pre-encoding data Codecs,
A demultiplexing control device that multiplexes the encoded image data, the encoded audio data, and the control data, and separates the multiplexed encoded image data, the encoded audio data, and the control data; A network interface device connected to the demultiplexing control device for interfacing with a transmission / reception partner; a transmission control device connected to the demultiplexing control device for performing an interconnection procedure with the transmission / reception partner;
In an image transmission apparatus provided with a system control apparatus for controlling the entire apparatus, a means for recognizing a communication partner apparatus and a model using control data separated from the demultiplexing control apparatus, and a unique communication control procedure. Has a switching means, the setting is set in a unique communication control procedure, and when the opponent device is recognized as a device and model equivalent to its own station by the control data separated from the demultiplexing device. Only the unique communication control procedure is automatically shifted.

Embodiment 4 FIG. Next, a fourth embodiment will be described below.

FIG. 12 shows the structure of the fourth embodiment. 91-1
Up to 02 is the same as in the first embodiment. 103 is a receiving BAS
This is a discriminating device for judging whether the opposing device is a device equivalent to the own station. Reference numeral 104 denotes a setting switch for changing the multiplex pattern to a unique format and performing communication control.

Next, the operation will be described with reference to the flowchart of FIG. When the setting switch is set to the non-standard operation setting (step ST131), the image transmission apparatus performs the ITU-T H.264 standard. The connection procedure of step 242 is performed, and the BAS sent from the opposite communication partner station during the connection procedure is analyzed (step ST132). If the model code of the opposite communication partner station obtained by the negotiation is the same as that of the own station device, the following non-standard communication control is performed (step ST133).

Thereafter, when communication is in progress (step ST
134), the BAS of the opposite communication partner device transmitted cyclically is sequentially analyzed (step ST135). When there is a BAS indicating that separation is not possible among the BASs received from the opposite communication partner device (step ST13)
6), the receiving apparatus notifies its own transmitting apparatus to perform the correcting operation on the opposite communication partner apparatus (step ST).
137). Non-standard BAS arbitrarily set for the own station transmitting device
Is transmitted to the opposite communication partner station device (step ST138). Also, communication is in progress (step ST
139) If the switch setting is not set to non-standard or if it is determined to be another model based on the model code, a standard operation is performed (step ST140).

FIG. 14 shows the operation of the opposite communication partner apparatus in response to this. When the setting switch is set to the non-standard operation (step ST141), the image transmission apparatus performs the T
TC standard JT-H. The connection procedure of 242 is performed, and the BAS sent from the partner station apparatus at the time of the connection procedure is analyzed (step ST142). If the model code of the partner station device obtained by the negotiation is the same as that of the own station device, the following non-standard communication control is performed (step S).
T143).

Thereafter, when communication is being performed with the partner station device (step ST144), the BAS of the partner station device transmitted with the multiplex pattern changed is sequentially analyzed (step S144).
T145). At this time, when the own station finds an error in the multiplex pattern and notifies it by BAS (step ST146).
Notifies the transmitting device of its own station that it is in the correction operation (step ST147). The self-station transmitting device that has been notified returns the multiplex pattern and the BAS to the state before multiplexing in order to correct the data multiplexing error caused by the multiplex pattern change (step ST148). If the switch setting is not set to non-standard or if the model code is recognized as another model and communication is in progress (step ST149), a standard operation is performed (step ST150).

As described above, this embodiment digitizes analog image data and performs a conversion operation of a predetermined image format, while a video input / output for converting digitized image data into analog image data. A device, a video codec for efficiently encoding image data input from the video input / output device, and restoring encoded image data to pre-encoding data, and digitizing analog audio data; Audio input / output device for converting encoded audio data into analog audio data, and audio for efficiently encoding audio data input from the audio input / output device, while restoring encoded audio data to pre-encoding data Codecs,
A demultiplexing control device that multiplexes the encoded image data, the encoded audio data, and the control data, and separates the multiplexed encoded image data, the encoded audio data, and the control data; A network interface device connected to the demultiplexing control device for interfacing with a transmission / reception partner; a transmission control device connected to the demultiplexing control device for performing an interconnection procedure with the transmission / reception partner;
An image transmission device equipped with a system control device that controls the entire device has means for switching to a unique communication control procedure, and if the setting is set to a unique communication control procedure, changes the multiplex format to a unique format And performs communication control. In this embodiment, it is possible to correct a multiplex pattern both in the case of manual setting by an operator using a setting switch and in the case of automatic setting in accordance with a partner model by a discriminating device. If the operator's settings and the standard operation are given priority, the operator can select whether to perform this operation or not, and at the same time, can connect to another model.

[0064]

As described above, according to the present invention, since the multiplex pattern from the opposite communication device is corrected by the own station device, it is assumed that the non-multiplex separation setting is performed by the other communication device. Can be recovered.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an image transmission device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a multiplex pattern error notification process for the block configuration of FIG. 1 according to the first embodiment of the present invention;

FIG. 3 is a format diagram showing a 56K multiplex pattern of audio and a multiplex pattern of 9.6K general-purpose data during 64 Kbps communication.

FIG. 4 is a flowchart showing a multiplex pattern error recognition process for the block configuration of FIG. 1 according to the first embodiment of the present invention;

FIG. 5 is a block diagram showing an image transmission apparatus according to one embodiment of the second embodiment of the present invention.

FIG. 6 is a flowchart showing a multiplex pattern error notification process for the block configuration of FIG. 5 according to the second embodiment of the present invention;

FIG. 7 is a flowchart showing a multiplex pattern error recognition process for the block configuration shown in FIG. 5 according to the second embodiment of the present invention;

FIG. 8 is a block diagram showing an image transmission apparatus according to an embodiment described in Embodiment 3 of the present invention.

FIG. 9 is a flowchart illustrating a multiplex pattern error notification process for the block configuration in FIG. 8 according to the third embodiment of the present invention.

FIG. 10 is a format diagram showing an area of control data when a unique multiplex pattern is used at 64 Kbps.

FIG. 11 is a flowchart showing a multiplex pattern error recognition process for the block configuration shown in FIG. 8 according to the third embodiment of the present invention.

FIG. 12 is a block diagram showing an image transmission apparatus according to one embodiment of the fourth embodiment of the present invention.

FIG. 13 is a flowchart illustrating a multiplex pattern error notification process for the block configuration of FIG. 12 according to the fourth embodiment of the present invention.

FIG. 14 is a flowchart showing a multiplex pattern error recognition process for the block configuration of FIG. 12 described in Embodiment 4 of the present invention.

FIG. 15 is a block diagram showing a conventional image transmission device.

FIG. 16 is a format diagram showing a frame structure at 64 Kbps.

FIG. 17 is an image transmission apparatus A communicating through a communication network.
1 is a system configuration diagram of an image transmission apparatus B. FIG.

[Explanation of symbols]

 Reference Signs List 91 video input / output device 92 video codec 93 audio input / output device 94 audio codec 95 delay circuit 96 general-purpose data input / output device 97 demultiplexing control device (MUX / DMUX) 98 network interface 99 telematic device 100 system control device 101 end network signal Control device 102 Transmission control device 103 Determination device 104 Setting switch 171 Image transmission device A 172 Communication network 173 Image transmission device B 174 Receiving device in image transmission device A 175 Transmission device in image transmission device A 176 Receiving device in image transmission device B 177 Transmission device in image transmission device B 178 System control device in image transmission device A 179 Demultiplexing control device in image transmission device A 180 Network interface 1 in image transmission device A The system controller in the multiplex separation control unit 183 an image transmission device B in the network interface 182 an image transmission apparatus B in one image transmitting apparatus B

Continuation of the front page (56) References JP-A-4-219044 (JP, A) JP-A-4-286292 (JP, A) Hiroshi Yasuda, "International Standard for Multimedia Coding", Maruzen (1991-6) −30), p. 204−220 (58) Fields investigated (Int. Cl. ⁷ , DB name) H04J 3/00-3/26 H04L 1/16 H04N ⁷ /08-7/081

Claims (4)

(57) [Claims] Transmitting means for transmitting the multiplexed data as claimed in claim 1] by multiplexing image data and audio data and control data, pairs
An image transmission apparatus having a receiving unit for receiving multiplexed data sent from a communication device and separating image data, audio data, and control data, wherein the receiving unit cannot separate the received multiplexed data.
Check for the presence of control data indicating that
If there is control data indicating that
Request the opposite communication device to correct the multiplex pattern
Request generation means for generating a multiplexing correction request
And, said transmitting means, an image transmission apparatus characterized by having a request transmission means for transmitting a correction request for multiplexing from the receiving means to the opposing communication apparatus. 2. The apparatus according to claim 1, wherein said receiving means further comprises a discriminating means for discriminating the other communication device from the separated control data, and operates said request generating means based on the discrimination result. The image transmission device as described in the above. 3. The image transmission apparatus has a setting unit for setting a unique communication control procedure. When the setting unit sets a unique communication control procedure, the image transmission apparatus sets a format of the multiplexed data to a unique communication control procedure. 2. The image transmission apparatus according to claim 1, wherein the communication is controlled by using a unique format after changing to a format. 4. The apparatus according to claim 3, wherein said receiving means further comprises a discriminating means for discriminating an opposite communication device from the separated control data, and operates said request generating means based on the discrimination result. The image transmission device as described in the above.