JPH02202249A - Message store and reproduction method, store control circuit and reproduction control circuit - Google Patents

Abstract

PURPOSE:To revise an allocated band to a communication terminal equipment by inserting and storing information relating to the allocated band in each medium message at the storage of various medium messages. CONSTITUTION:A voice communication control section 21 receives a band allocation signal from a sender terminal equipment via a multiplex/demultiplex section 28, transfers a band revision flag to a buffer 24 when the allocated band is revised, references a band allocation signal and stores the band information representing the band allocated newly for the communication of the voice medium message to the buffer 24. In the case of reproducing the voice message, the voice communication control section 21 reads the voice medium information reproduced from the buffer 24, compares the voice medium information with the band revision flag and when they are not coincident, the voice communication control section 21 checks the band information representing the allocated band to the voice message and revises the allocation of a subchannel.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is connected via a communication network to a communication terminal that inputs and outputs audio, data, video, etc., and synchronizes messages between the communication terminal and various media. The present invention relates to a message storage and playback method, a storage control circuit, and a playback control circuit in a message storage device that transmits and receives messages.

(Prior Art) As an example of a storage device that stores messages in various media, there is a multimedia mail device described in Japanese Patent Application No. 11946/1983. As shown in FIG. 5, conventionally, a multimedia mail device 2 that integrates and processes various information media includes a storage section 20, a communication control section and a buffer corresponding to the information media, for example, a voice communication control section 21, a text communication control section. 22, an image communication control section 23, buffers 24, 25, 26, and a management section 27. Note that examples of the storage unit 20 include a magnetic disk, an optical disk, and a semiconductor memory.

Now, in such a configuration, when storing and reproducing multimedia messages, the management section 27 connects the telephone 3, the text terminal 5, the voice communication control section 21, and the text communication control section 2.
2 are respectively sent and received voice messages and text messages, and the voice messages and text messages are stored in a storage section 20 via buffers 24 and 25 and reproduced. Furthermore, the management unit 27 divides text messages and voice messages into blocks based on instructions from the user of the telephone 3 and text terminal U, and creates media synchronization management information for managing the synchronization relationship between media on a block-by-block basis. ,
It is stored in the storage unit 20. On the other hand, during playback, the management section 2-
7 refers to the media synchronization management information and performs voice communication II.
The J# section 21 and the text communication control section 22 are controlled to synchronize and reproduce the voice message and the text message.

According to the above system, it is possible to transmit and receive different media messages for each communication line, store and reproduce them.

On the other hand, communication terminals that use the frame structure for audio/visual services considered as CCITT Recommendation H, 221 divide the communication line band into subchannels at the time of transmission, and each subchannel is used for communication of each media. It is used for transferring band allocation signals from the source communication terminal to the destination communication terminal, and for other purposes, and changing the allocated band during communication. For example, as shown in FIG. 6, the source communication terminal divides the 64kbps communication line, allocates 32kbps to voice information and transfers it using AD/PCM encoding, and allocates 24kbps and bandwidth to text information. signal,
In addition, it is transmitted using 8 kbps. The multimedia mail device described above receives and stores each subchannel at once from the communication terminal that divides and uses the communication line band as described above, and it is difficult to use the multimedia mail device that supports media such as general telephones and data terminals. When transferring a message to a terminal, the desired media information must be extracted after being played back.

Therefore, as shown in FIG. 7, a demultiplexing section 28 is inserted between the circuit switching network 1 and the communication control sections 21, 22, 23,
The communication channel connected to the circuit switched network 1 is separated into each subchannel and a band allocation signal, the messages transferred through each subchannel are stored by media, and the band allocation signal received from the source communication terminal is separately stored. There is a way to accumulate it.

(Problem to be Solved by the Invention) However, in such a method, the same band allocation signal is repeatedly transferred, so redundant information is accumulated. Furthermore, each media message and bandwidth allocation information is stored independently. Therefore, during playback, the management unit must constantly refer to the bandwidth allocation information, control the synchronization relationship between the bandwidth allocation information and each media message, and determine the allocated bandwidth for each media message for each transfer unit such as 1 byte. The processing load is heavy.

An object of the present invention is to provide a message storage and playback method, a storage control circuit, and a playback control circuit that solve the above-mentioned problems.

(Means for Solving the Problem) In order to solve the above-mentioned problem, the first invention of the present application is such that the communication band is divided into subchannels and used, and the allocated band of each subchannel is changed during communication. A message storage device that communicates with a communication terminal that inputs/outputs voice, data, video, etc. through a communication line, and has a demultiplexing unit that demultiplexes the communication band corresponding to subchannels. In a message storage device that individually stores messages transferred through a message storage device, during storage, a band allocation signal is received from a sending terminal through the multiplex M unit, and when a change in band allocation is detected, a band change flag and an allocation signal are sent. Information indicating the band (bandwidth information) is inserted and stored in the message information, and when the same code as the band change flag appears in the message information, the band change flag is continuously stored, and when playing back, the playback message information When a band change flag is detected in the data, if the subsequent data matches the band change flag, only one band change flag is sent to the communication terminal, and if the subsequent data does not match the band change flag, the band information is sent. According to the band information, the bandwidth allocated to the subchannel within the communication line is
To provide a message storage and playback method characterized by changing the W part.

In addition, in order to solve the above-mentioned problem, the second invention of the present application provides for a communication line in which the communication band is divided and used for each subchannel, and the allocated band of each subchannel may be changed during communication. A message storage device that communicates with a communication terminal that inputs and outputs audio, data, video, etc., and has a demultiplexing unit that demultiplexes communication bands corresponding to subchannels, and messages that are transferred through each subchannel. an accumulation control circuit in a message storage device that individually accumulates message information, the storage control circuit is connected to a buffer provided between a storage section for storing message information and the demultiplexing section, and holds at least a band change flag; a holding circuit that outputs an output; b a comparison circuit that compares the message information received from the demultiplexer with the output of the hold circuit and outputs a matching signal when the two match; C6 receives a band allocation signal from the demultiplexer; a generation circuit that generates band information based on the band allocation signal; d. a detection circuit that receives the band allocation signal from the multiplexer/demultiplexer, detects a change in the allocated band, and outputs a change signal; e. receiving message information from the demultiplexer, receiving the band change flag from the holding circuit, receiving the band information from the generating circuit, receiving the change signal from the detecting circuit, and upon receiving the coincidence signal; Continuously outputs the band change flag, outputs the band change flag and the band information when receiving the change signal, selects the message information and outputs to the buffer except when receiving the coincidence signal and change signal. Provided is a storage m II gJ circuit comprising: a selection circuit that selects;

Furthermore, in order to solve the above-mentioned problem, the third invention of the present application provides a method for transmitting data through a communication line in which the communication band is divided into subchannels and the allocated band of each subchannel may be changed during communication. A message storage device that communicates with a communication terminal that inputs and outputs audio, data, video, etc., and has a demultiplexing unit that demultiplexes the communication band corresponding to subchannels, and individually separates messages transferred through each subchannel. a reproduction control circuit in a message storage device that stores message information, the circuit is connected to a buffer provided between a storage section for storing message information and the demultiplexing section, and at least holds and outputs a band change flag; a holding circuit; b. a determination circuit that compares the message information received from the buffer with the output of the holding circuit and outputs a match signal when the two match; c; a judgment circuit that receives the match signal and maintains the match state; a state circuit that outputs a signal; d, a generation circuit that outputs a band allocation signal to the demultiplexer based on band information following the band change flag included in the message information received from the buffer; e, the matching state. If the matching signal is further received during signal reception, the band change flag included in the message information received from the buffer is discarded, and if the matching signal is not received while the matching status signal is being received, the band is changed. a gate circuit that discards the flag and the allocated band information and outputs the message information received from the buffer to the demultiplexer when the coincidence state signal is not received. provide.

(Operation) In the invention of the present application, the message storage device inserts and stores allocated bandwidth information in each message information when storing messages, extracts the allocated bandwidth information from the message information to be reproduced during reproduction, and transmits it to the communication terminal. Change the bandwidth allocated to each message information.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1(a) and (b) are sequence diagrams showing an embodiment of the first invention of the present application, and FIG. 2 is an explanatory diagram showing accumulated information of the first invention. The case where it is applied to storage and reproduction will be explained below.

First, in the case of storing a voice message, as shown in FIG. 1(a), the voice communication control section 21 receives a band allocation signal from the transmission source terminal via the demultiplexing section 28.Step 1)
, check whether the allocated band has been changed. the result,
If the allocated band has been changed, the band change flag is transferred to the buffer T24 (Step 3), and the band information indicating the newly allocated band for voice media message communication is buffered by referring to the band allocation signal. 24 (step 4), then the voice communication control unit 21
The audio media message separated by media is received from the demultiplexer 28 (step 5), and the audio media message is similarly received even if the allocated band has not been changed. Then, the audio communication control unit 21 compares the received audio media information with the band change flag (step 6), and if they are equal, transfers the two band change flags to the buffer 24 and stores them (step 7); on the other hand, if they are not equal, In this case, the received audio media information is transferred as it is to the buffer 24 and stored therein (step 8).The audio communication control unit 21 performs the processing of steps 1 to 8 for 0 or more, and writes the audio media information to the buffer 24. This is repeated for each unit, for example, for each byte.

On the other hand, in the case of reproducing a voice message, as shown in FIG. 1(b), the voice communication control unit 21 first reads voice media information to be reproduced from the buffer 24 (step
), the audio media information is compared with the band change flag (step 12), and if they are equal, the subsequent audio media information is read out from the buffer 24 (step 13), and compared again with the band change flag (step 14).
), and if they match, one of the two band change flags is discarded and one is output to the demultiplexer 28 (step 15), and transferred to the communication terminal. On the other hand, if they do not match in step 14, the voice communication control unit 21 checks whether the band information indicates the band allocated to the voice message (step 16), and if applicable, changes the allocated band signal and multiplexes the message. The output is sent to the separation unit 28 (step 17), and the subchannel allocation is changed. If the band change flag does not match in step 16, the first band change flag and the subsequent audio media information are output in order (step 18); - if the audio media information does not match the band change flag in step 12, The audio media information is output as is to the demultiplexer 28 (step 19) and transferred to the communication terminal.

Next, with reference to FIG. 2, the accumulated information in the embodiment of FIG. 1 will be explained. In FIG. 2, (a) shows the audio media information received by the audio communication control unit 21 from the demultiplexing unit 28, and (b) shows the accumulation accumulated in the storage unit 20 from the audio communication control unit 21 via the buffer 24. indicate information,
(c) shows audio media information transmitted from the audio communication control section 21 to the communication terminal through the demultiplexing section 28.

First, when there is a change in the allocated band while audio media information is being stored, the audio communication control unit 21 inserts a band change flag and band information into the audio media information and stores it. On the other hand, during playback, the audio communication control unit 21 deletes the band change flag and band information from the stored information, and causes the demultiplexing unit 28 to transmit only the audio media information to the communication terminal. Additionally, if the same code as the band change flag appears in the audio media information while the audio media information is being stored, the audio communication control unit 21 additionally inserts and stores the band change flag, and deletes the added band change flag during playback. Then, one band change flag and subsequent audio information are transmitted to the communication terminal.

In the above explanation, the present invention was applied to the accumulation and playback of voice messages, but the present invention is equally applicable to the accumulation and reproduction of image messages, and the present invention is effective regardless of the media type. It is.

Furthermore, when the same code as the band change flag appears in a media message during storage, two band change flags are stored, one is discarded, and the other is played back. Therefore, for the band change flag, it is sufficient to use a code that appears least frequently in media messages and has a length of 1 byte, which is the storage unit of message information.
Furthermore, the encoding of the bandwidth information uses a code that is different from the bandwidth change flag and has the same length as the storage unit of the media information, so as not to conflict with the processing when the same code as the bandwidth change flag appears in the storage media message. Just leave it there.

For example, in the case of a voice message, 32k
b p s ADPCM encoding and 64k b p s
Encoding rate conversion unit with PCM encoding, 56 k b p
s An encoding speed converter between PCM encoding and 64 kbps PCM encoding is provided between the voice communication control section and the circuit switching network, and the encoding speed converter is selected using a band allocation signal during playback, and speed conversion is performed. If you perform
It is also possible to transfer the message to a regular telephone that communicates using b ps PCM or the like.

As described above, according to the present invention, it is possible to generate an allocated band signal by embedding band information in each accumulated message and inspecting the message during playback, and to have the demultiplexer control band allocation. become.

Next, the storage control circuit, which is the second invention of the present application, will be explained. FIG. 3 is a configuration diagram showing an embodiment of the second invention. In FIG. 3, an accumulation control circuit 201 is a circuit that is incorporated in each of the voice communication control section 21 and image communication control section 23 of FIG. 204, detection circuit 2
05, a selection circuit 206, and an address counter 207. In the following embodiments, a case where the present invention is applied to the voice communication control section 21 will be described as an example.

The holding circuit 202 includes a memory, a switch, etc., and holds a band change flag set in advance.

The comparison circuit 203 receives the media information from the demultiplexer 28, compares it with the band change flag output from the holding circuit 202, and outputs a match signal to the selection circuit 206 when they match.

Outbreak FI! The I204 receives the band allocation signal from the demultiplexer 28, encodes the allocated band of the media information based on the band allocation signal, generates band information, and sends it to the selection circuit 20.
Output to 6.

The detection circuit 205 monitors the band allocation signal received from the demultiplexer 28, detects a change in the allocated band, and outputs the change signal to the selection circuit 206.

The selection circuit 206 includes a demultiplexer 28, a holding circuit 202,
A 9-selection circuit 206 connected to the generation circuit 204 selects the media information, band change flag, and band information received from each and outputs it to the buffer 24, and upon receiving the coincidence signal, selects the band change flag from the holding circuit 202. Select 2
Outputs band change flags. Also, when receiving a change signal, the band change flag from the holding circuit 202 and the generation circuit 2
The band information from 04 is selected and output to the buffer 24 in order. Media information is selected and output except when a match signal or a change signal is received.

The address counter 207 outputs a write address to the buffer 24 each time the selection circuit 206 outputs accumulated information addressed to the buffer 24, and also increments the address and holds the address to be written to the buffer 24 next.

In this configuration, when the comparison circuit 203 of the accumulation control circuit 201 receives the media information from the demultiplexer 28, it compares it with the output of the holding circuit 202, and if they match, outputs a match signal, and sends the holding circuit to the selection circuit 206. The two band change flags output from the address counter 202 are outputted to the buffer 24 and written into the buffer 24 based on the address output from the address counter 207.

On the other hand, the detection circuit 205 receives the band allocation signal from the demultiplexer 28 , and if there is a change in the band allocation, outputs the change signal to the selection circuit 206 , and outputs the band change flag and the generation circuit 204 to the selection circuit 206 . Bandwidth information is output to the buffer 24 and written into the buffer 24 based on the output address of the address counter 207.

As described above, according to the present invention, it becomes possible to insert and store band information into media messages to be stored.

Next, a reproduction control circuit, which is the third invention of the present application, will be explained. FIG. 4 is a configuration diagram showing an embodiment of the third invention. In FIG. 4, a playback control circuit 211 is a circuit that is incorporated in each of the audio communication control section 21 and the image communication control section 23 of FIG. 7 and operates during playback, and a holding circuit 212
, determination circuit 213, state circuit 214, generation circuit 215,
It is composed of a gate circuit 216 and an address counter 217. In the following embodiments, a case where the present invention is applied to the voice communication control section 21 will be described as an example.

The holding circuit 212 is the holding circuit 202 in the second invention.
It has the same function as , and is connected to the determination circuit 213 .

The determination circuit 213 receives media information to be reproduced from the buffer 24 and combines the received media information with the holding circuit 212.
It compares the output with the output and outputs a match signal when there is a match. Also,
While receiving the matching status signal output from the status circuit 214,
After receiving the media information, a reset signal is sent to the state circuit 214.
Output to.

The state circuit 214 receives the match signal from the determination circuit 213, maintains the match state, and generates a match state signal indicating that a band change flag has been detected in the playback media information from the determination circuit 213, the generation circuit 215, Output to gate circuit 216. Further, upon receiving a reset signal from the determination circuit 213, the state is reset and returned to the initial state.

The generation circuit 215 receives the match signal output from the state circuit 214, and if it does not receive a match signal from the determination circuit 213, it interprets the playback media information from the buffer 24 as band information following the band change flag. A band allocation signal is generated and output to the demultiplexer 28 to change the allocation of subchannels to each media.

When the gate circuit 216 receives the match state signal output from the state circuit 214 and further receives the match signal from the determination circuit 213, it considers that it has received two band change flags from the buffer 24, and selects one of the two band change flags. is outputted to the demultiplexer 28. Further, if a match state signal is received but no match signal is received, it is assumed that the band change flag and band information have been received from the buffer 24, and the band change flag and band information are discarded. On the other hand, if the gate circuit 216 does not receive the match state signal and the match signal, it outputs the media information received from the buffer 24 as is to the demultiplexer 28 and transfers it to the communication terminal. Address counter 217 has the same function as address counter 207 in storage control circuit 201 in FIG. 3, and holds the read address from buffer 24.

In this configuration, the determination circuit 213 of the reproduction control circuit 211 receives reproduction media information from the buffer 24 based on the output address of the address counter 217, and compares it with the output of the holding circuit 212. If they do not match, the gate circuit 216 outputs the signals directly to the demultiplexer. - On the other hand, if they match, the determination circuit 213 outputs a match signal and causes the state circuit 214 to hold that the band change flag has been detected and output a match state signal.

The determination circuit 213 further receives the subsequent reproduction media information from the buffer 24, compares it with the output of the holding circuit 212, and outputs a coincidence signal if they match.The 0 generation circuit 215 receives a coincidence state signal. However, if a matching signal is not received, the generated band allocation signal is changed based on the received reproduction media information and outputted to the demultiplexer 28.

Further, when the gate circuit 216 receives the match state signal and the match signal, the gate circuit 216 sends one band change flag to the demultiplexer 28.
If a matching signal is not received, the band change flag and band information are discarded.

As described above, the reproduction control circuit of this embodiment extracts band information from the message to be reproduced, generates a band allocation signal, outputs it to the demultiplexer, and causes the demultiplexer to control the allocated band. becomes possible.

As described above, in the first to third inventions, an example has been described in which a communication line is divided into subchannels and the subchannels are allocated and used for various media messages. How can the present invention be applied even when each subchannel is assigned to the same type of media message? The present invention is effective and applicable regardless of the media type of each subchannel or the combination of media types. It is.

Furthermore, in the above explanation, the CCITT recommendation H.221 was used as an example, but the present invention is applicable and effective regardless of the frame structure as long as the communication band is divided into subchannels. It is.

(Effects of the Invention) As described above in detail, according to the present invention, a message storage device that divides a communication line connected to a communication terminal into subchannels and allocates each message for communication can handle various media messages. It becomes possible to insert and store information regarding the allocated band into each media message during storage, and to extract information regarding the allocated band from the media message to be reproduced during playback to change the allocated band to a communication terminal.

As described above, according to the present invention, it is possible to store and reproduce messages in which the allocated band to each subchannel changes and the encoding speed changes, so the effects are significant.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are diagrams showing an embodiment of the first invention,
FIG. 2 is an explanatory diagram showing accumulated information of the first invention, FIG. 3 is a block diagram showing an embodiment of the second invention, FIG. 4 is a block diagram showing an embodiment of the third invention, and FIG. The figure is a block diagram showing an example of a conventional multimedia mail device, FIG. 6 is an explanatory diagram showing a frame structure in an audio-visual service, and FIG. 7 is a block diagram showing an example of another conventional multimedia mail device. be. 1... Circuit switched network, 2... Multimedia mail device, 3, 4... Telephone, 5.6... Text terminal, 2
0...Storage unit, 21...Voice communication control unit, 22...
-Text communication control unit, 23...image communication control unit, 2
4゜25.26... Buffer, 27... Management section, 28... Demultiplexing section, 201... Accumulation control circuit,
202゜212... Holding circuit, 203... Comparison circuit, 204゜215... Generation circuit, 205... Detection circuit, 206... Selection circuit, 207, 217... Address counter, 211... ...Reproduction control circuit, 213...
- Judgment circuit, 214... Status circuit, 216... Gate circuit.

Claims (3)

[Claims] (1) Communication with communication terminals that input and output audio, data, video, etc. through communication lines where the communication band is divided into subchannels and the allocated band for each subchannel may change during communication. A message storage device that
In a message storage device that has a demultiplexing section that multiplexes and demultiplexes communication bands corresponding to subchannels, and stores messages transferred through each subchannel individually, when storing, a band allocation signal is sent from a source terminal through the demultiplexing section. When received and detects a change in band allocation, a band change flag and information indicating the allocated band (bandwidth information) are inserted and stored in the message information, and if the same code as the band change flag appears in the message information, Bandwidth change flags are accumulated continuously, and when a band change flag is detected in the playback message information during playback, only one band change flag is sent to the communication terminal if the subsequent data matches the band change flag. , if the subsequent data does not match the band change flag, it is interpreted as band information, and the demultiplexer changes the allocated band to the subchannel in the communication line according to the band information. How to play. (2) Communication with communication terminals that input and output audio, data, video, etc. through communication lines where the communication band is divided into subchannels and the allocated band for each subchannel may change during communication. A message storage device that
A storage control circuit in a message storage device that has a demultiplexing section that demultiplexes communication bands corresponding to subchannels, and stores messages transferred through each subchannel individually, the storage control circuit having a demultiplexing section that demultiplexes communication bands corresponding to subchannels, and that has a storage section that stores message information. A holding circuit that is connected to a buffer provided between and the demultiplexer and the demultiplexer and that holds and outputs a band change flag; b. Compares the message information received from the demultiplexer with the output of the hold circuit. c. A generating circuit that receives a band allocation signal from the multiplexing/demultiplexing section and generates band information based on the band allocation signal; d. From the multiplexing/demultiplexing section. a detection circuit that receives a band allocation signal, detects a change in the allocated band, and outputs a change signal; e. receives message information from the demultiplexer, receives the band change flag from the holding circuit, The band information is received from the circuit, the change signal is received from the detection circuit, the band change flag is continuously output when the matching signal is received, and the band change flag and the band are output when the change signal is received. An accumulation control circuit comprising: a selection circuit that outputs information, selects the message information, and outputs the message information to the buffer except when receiving the coincidence signal and the change signal. (3) Communication with communication terminals that input and output audio, data, video, etc. through communication lines where the communication band is divided into subchannels and the allocated band for each subchannel may change during communication. A message storage device that
A reproduction control circuit in a message storage device that has a demultiplexing section that demultiplexes communication bands corresponding to subchannels, and separately stores messages transferred through each subchannel, the circuit having a demultiplexing section that demultiplexes a communication band corresponding to subchannels, and a reproduction control circuit that is connected to a storage section that stores message information. A holding circuit that is connected to a buffer provided between the buffers and the demultiplexing section and that holds and outputs a band change flag; b. A holding circuit that compares the message information received from the buffer with the output of the holding circuit; c. A state circuit that receives the match signal, maintains the match state, and outputs the match state signal; d. A band change flag included in the message information received from the buffer. a generation circuit that outputs a band allocation signal to the multiplexing/demultiplexing unit based on band information subsequent to the above; If the matching signal is not received during reception of the matching state signal, the band changing flag and the allocated band information are discarded, and if the matching state signal is not received, the band changing flag is discarded. a gate circuit for outputting the message information to the demultiplexing unit.