JPS627237A - Method and apparatus for transmission and reception in time division multiplex - Google Patents

Abstract

PURPOSE:To improve the utilizing efficiency of a transmission line by applying assignment of a transmission line time slot in response to traffic characteristics of telephone signal, a data signal and a picture signal, applying coding to a telephone channel to multiplex the transmission signal only. CONSTITUTION:A telephone channel module circuit 105 inputting a telephone signal via a signal line 101-1 encodes the telephone signal. The result of coding is outputted to the 1st multiplex circuit 125 via a signal line 106 and a closing signal closing the telephone line is outputted via a signal line 101-2 according to the assignment signal outputted from an assignment memory 150 via a signal line 151. A picture signal is inputted to a picture channel module circuit 120 via a signal line 104-1 and outputted to the 3rd multiplex circuit 160 via a signal line 121. Further, the presence of a picture signal and speed information are outputted to the 2nd multiplex circuit 130. Moreover, a signal controlling the coding speed is outputted to an external picture encoder via a signal line 104-2 according to the assignment signal via the signal line 151.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a time-division multiplexing transmission/reception method and apparatus thereof, and in particular, a method for efficiently multiplexing and accommodating not only telephone signals but also data signals and image signals at once. When transmitting and receiving data, the i′″rgy<vp″*J! l#
! f* 1,1ar\t=4ifx%M&M.

The present invention relates to a time division multiplex transmission/reception method and apparatus for performing the same.

<Prior art and its problems> Conventionally, when multiplexing and transmitting telephone signals, data signals, and image signals, a transmission line with a certain transmission capacity is used for telephone signals within that transmission capacity. Each signal is multiplexed after predetermining the capacity for the data signal and the capacity for the Katazuka signal. For example, the retrospective capacity is 1.53
If there is a 6Mbps''C, 64KX1 will accommodate 10 channels of 64Kbps/channel telephone line.
0=640K), to accommodate 2 channels of 64KbpS/channel data line 64K
68/channel image lines were accommodated in combinations such as l channel/channel.

However, voice signals, data signals, and image signals are not always present on telephone lines, data lines, and video lines; when it comes to voice signals, they are present only about 40% of the time during a conversation. is statistically known. Therefore, in terms of time, the capacity of the transmission line is 100%.
It is rarely used, and its usage rate is only about 40 channels for audio channels, for example. The same can be said for data channels and DL channels. Therefore, in the conventional multiplexing system, the transmission line St was not fully used, resulting in considerable waste, and had the drawback of low line utilization efficiency.

<Object of the Invention> An object of the present invention is to provide a time division multiplexing transmitting/receiving method and an apparatus therefor, which further improves the utilization efficiency of transmission lines than in the past, in view of the drawbacks of the prior art described above.

<Configuration of the Invention> According to the first invention, when time-division multiplexing telephone signals, data signals, and image signals input from a plurality of telephone lines, data lines, and image lines, In a time division multiplexing transmission/reception method in which the telephone signal, the data signal, and the image signal are multiplexed only on a line for which it is determined that the telephone signal, data signal, or image signal is present, the transmitting side multiplexes the telephone signal. The telephone signal is encoded by selecting one of at least two encoding methods before the image signal is multiplexed. After blocking a predetermined number of telephone lines from among them, multiplexing is performed, and a plurality of said telephone lines,
Allocation information indicating which pulses of signals are multiplexed in the data line and the image line and also indicating the type of encoding method for the voice line; the encoded telephone signal; A data signal and the image signal are multiplexed and transmitted, the receiving side extracts the allocation information from the sent blood-rich signal, and according to the allocation information, the telephone signal is encoded in the multiplexed signal, 1. The data signal and the image signal are distributed to each corresponding line, and for telephone recall, one of at least two or more decoding methods is selected and decoded according to the allocation information. A time division multiplex transmission/reception method with ?4F frequency is obtained.

Furthermore, according to the second invention, at least one telephone channel module circuit inputs a telephone signal input from a telephone line and encodes the telephone signal according to an assigned signal; at least one data channel module circuit that receives a data signal and converts it into a format suitable for multiplexing according to the assigned signal; and a module circuit that receives an image signal input from the image line and converts it into a format suitable for multiplexing according to the assigned signal a first multiplexing circuit that inputs and multiplexes an encoded result of a telephone signal that requires less power to convert into a format suitable for pagination and a data signal; and a multi-channel output from the first multiplexing circuit. The presence or absence of an audio signal, data signal, or image signal in the telephone line, data line, and image line is outputted from the memory circuit and each of the module circuits by inputting the conversion signal and performing readout according to the allocation signal. a second multiplexing circuit that receives and multiplexes channel information representing the usage status of the nine lines and the input signal speed; and receives the multiplexed channel information output from the second multiplexing circuit as input. I. An allocation process for determining the telephone number, the number of transmission line time slots to be allocated to the data signal and the image signal based on the channel information.

Then, an allocation memory that stores the allocation information output from the allocation processor and outputs the allocation signal, an error correction encoding circuit that receives the allocation information and performs error correction encoding, and an error correction encoding circuit that also receives the allocation information. a control circuit that generates a control signal necessary for multiplexing as an input; a multiplexed signal output from the memory circuit according to the control signal; assignment information output from the error correction encoding circuit; and the image channel module. a third multiplexing circuit for multiplexing the image signals output from the circuit; A time division multiplex transmitting apparatus is obtained, which is characterized in that it selects and encodes 1) from among the above, and also blocks an empty telephone line in accordance with the assignment signal.

Furthermore, according to the third aspect of the present invention, a multi-page signal in which encoded telephone signals, data signals, nine painter signals, and transmission line time slot allocation information are multiplexed is input, and a multi-page signal is inputted according to a control signal from the multi-N signals. a first separation circuit that separates the telephone signal, the data signal, the painter signal, and the assignment information;
a memory circuit that receives the telephone signal and data signal output from the first separation circuit and performs time slot conversion according to one allocation signal; and a telephone signal and data signal that are multiplexed and output from the memory circuit. a second separation circuit that takes input and distributes it to corresponding channels; an error correction circuit that receives the allocation information output from the first separation circuit and performs error correction; and an output from the error correction circuit. an allocation memory that stores the allocation information to be used, and the allocation information outputted from the error correction circuit, and input the allocation information to the ff.
a control circuit that outputs a control signal necessary for controlling the eleven separation circuits; a telephone signal output from the second separation circuit; and the allocation signal output from the allocation memory; at least one telephone channel module circuit for decoding the telephone signal according to the assignment signal; and at least one image channel module circuit that manually converts the image signal output from the first separation circuit into a format suitable for transmission according to the assigned signal. In other words, the telephone channel module circuit includes at least two or more decoding circuits depending on the type of the input telephone signal, and one of the decoding circuits is decoded based on the allocation signal. A time division multiplex receiving apparatus is obtained, which is characterized in that it selects and decodes one signal.

<Operation/Principle of the Invention> The principle of the present invention is that voice signals, data signals, and image signals are not constantly present in telephone lines, data lines, and image lines; It is statistically known that audio old names only exist 40% of the time.
Noting that even with Ds data lines, data signals exist only when data is transmitted using a data terminal, and the same is true for image lines, When a signal or image signal is generated,
By adaptively multiplexing only these signals and transmitting them, one transmission line can be used effectively69, and by monitoring the trough and quick characteristics of telephone lines, data lines, and image lines, The objective is to achieve multiplexing that achieves the highest recycling efficiency when comprehensively judged from the following characteristics.

To explain more specifically, digital voice insertion (DSI:
Digital 5peech Interpola
tion), it is possible to accommodate approximately twice the number of telephone lines using the same transmission capacity as before. If you look at this from a different perspective, it means that the efficiency of using circuits is doubled. DSI is already well known.

To put it simply, by inserting all the telephone signals of another line into the idle time of one telephone line (statistically about 601),
One line is used isometrically to double the capacity. Therefore, for example, where 30 telephone lines were conventionally transmitted, it is now possible to transmit 60 telephone lines.

Furthermore, the present invention further increases the number of accommodated channels by performing highly efficient encoding on telephone signals. There are several high-efficiency encoding methods. For example, here we use adaptive differential PCM at a transmission rate of 32 Kbps.
method (ADPCM). To briefly explain ADPCM, a prediction signal for input audio 1M is obtained in advance, and only the difference signal (prediction error signal) between this prediction signal and the input signal is encoded.
There are various methods for achieving high-quality encoding in trade, but for example, the Conference record of global communication, which was published in December 1984.
7 of f global communication)
The methods described on pages 74 to 777 can be used. In this way, high quality signal transmission is possible at half the transmission speed compared to the conventional 64 Kbps PCM. Therefore, if this ADPCM is used together with the DSI mentioned above,
This means that as many as 120 telephone lines can now be sent using a line that previously could carry only 30 lines. However, the problem here is that this method is only effective for telephone signals, such as voice signals and similar signals.
For example, when a high-speed modem signal is present, the occurrence of idle time in the voice signal is unpredictable, and even if the signal is encoded using 32 Kbps high-efficiency encoding, high-quality encoding may not be expected. The former can be dealt with by reducing the number of input channels to an appropriate value, and the latter can be dealt with by using a different encoding method, such as 64Kbps PCMi, for high-speed modem signals. You can deal with it.

Regarding data lines, by sending data signals only on the lines where data signals are generated, based on the same principle as DSI for voice, it is possible to accommodate more data lines than before, increasing line utilization efficiency. will improve.

Similarly, the image line is also configured to transmit only when an image signal exists. However, in this case, the transmission capacity required to transmit the image signal is much larger than that for other audio and data, so even if an image signal is generated, it does not mean that the necessary transmission capacity can be obtained immediately. do not have. If you want to avoid this, you can always reserve capacity for images in the transmission capacity of the entire line, but if you do this, even when no image signals are generated, It is undesirable to leave the capacity secured, as this means that a large portion of the total circuit capacity remains unused.

Therefore, in the present invention, when no image signal is generated, the transmission line capacity is allocated to telephone signals and data signals to increase the efficiency of use of the transmission line, and when an image signal is generated, the transmission line capacity is allocated to telephone signals and data signals.
After securing the necessary transmission capacity by blocking a predetermined number of telephone lines, the entire transmission capacity is allocated to the image signal.

By allocating the transmission capacity adaptively in accordance with the generation of telephone signals, data signals, and image signals as described above, it is possible to eliminate unused portions of the transmission capacity of the line, and as a result, the line This makes it possible to significantly improve the utilization efficiency of

In this explanation, the audio signal is encoded with 32 Kbps ADPCM, and the high-speed modem signal is encoded with 64 Kbps PCM, but for example, if the audio signal is encoded with 16 Kbps
It is also possible to encode with ps and modem signal ft64Kbps, and there are no particular limitations on the encoding speed or type.

<Example> The first invention will be explained in detail using the drawings.

FIG. 1 is a block diagram of a time division multiplex transmission apparatus which is an embodiment of the second invention. Using FIG. 1, an example of the time division multiplex transmission method of the first invention will be explained. do. Among the signals input via a plurality of telephone lines, data lines or image lines indicated by reference numeral 100, voice signals are input to telephone channel modules 105, 110, data signals are input to data channel module circuit 115, The image signals are respectively input to module circuits 120 for image channels. For the sake of explanation, it is assumed here that there are a total of N input lines.

The telephone channel module circuit 105 to which the telephone signal is input via the signal line 101-1 encodes the telephone signal. Here, if the telephone signal is a voice signal or a low-speed modem signal, it is encoded using 32Kbps ADPCM, and for a high-speed modem signal, it is encoded using 64Kbps.
Encode using sPCM. In addition, it performs voice detection to detect whether or not a voice signal exists in the input telephone signal, and also determines whether the connected telephone line is currently in use, and stores this information (encoding speed; to 764
K.

The presence/absence of an audio signal (9 line used/unused, etc.) is sent as channel information to the second multiplexing circuit 1 via a signal line 107.
30. The encoding result is output to the first multiplexing circuit via signal line 106. In addition, allocated memory 150
A blocking signal for blocking the connected telephone line is outputted via the signal line 101-2 in accordance with an assignment signal outputted from the terminal via the signal line 151.

The above operation is similar for other telephone channel modière circuits, for example, telephone channel modière circuit 1.
10, similar signals are exchanged via signal lines 111, 112, 151 corresponding to signal lines 106, 107, 151, respectively.

In the data channel module circuit 115, the signal 11
d3) The data signal input via 103 is converted into a format suitable for multiplexing and output via signal line 116 to the first multiplexing circuit. Further, channel information indicating the data signal, whether or not a data signal is present in the gland, and the speed of the input data signal is outputted to the second multiplexing circuit 130 via the signal line 117.

The image channel module circuit 120 includes a signal line 10.
An image signal is inputted via line 4-1, converted into a format suitable for multiplexing, and sent to third multiplexing circuit 1 via signal line 121.
At the same time, channel information indicating whether or not an image signal is present on the image line and the speed of the input image signal is outputted to the second multiplexing circuit 130 via the signal line 122. A speed control signal for controlling the encoding speed of the image signal according to the assignment signal inputted via the signal line 151 is outputted to the external image encoding device via the signal line 104-2. be done.

The first multiplexing circuit 125 receives the encoded result of the telephone signal and the data signal output from the voice channel module circuits 105 and 110 and the data channel module circuit 115, multiplexes them, and outputs them via the signal $126. and is input to the memory circuit 135. The memory circuit 135 reads and stores only the signals to be transmitted from among the telephone signals or data signals inputted in accordance with the assignment signal inputted via the signal line 151.

The channel information of each module circuit is input to the second multiplexing circuit 130, multiplexed, and then input to the allocation processor 140 via the signal line 131. Time slots (or transmission capacity) to be assigned to channels and image channels are determined.

The transmission time slot assignment result for each channel is sent via the signal edge 141 to the assignment memo 1J150° control circuit 1.
45 and an error correction encoding circuit 155. In the allocation memory 150, the time slot allocation results are held and repeatedly read out and sent to the signal line 151 as an allocation signal.
through the memory circuit 135. Telephone channel module circuit 105° 110, data channel module circuit 115° and image channel module circuit 1
20 is input. The error correction encoding circuit 155 performs error correction encoding on the input allocation signal, and then outputs the signal 4.
156 to a third multiplexing circuit 160.

The control circuit 145 generates a control signal for controlling the third multiplexing circuit 160 in accordance with the input assignment signal, and outputs this via the signal line 146.

The third multiplexing circuit 160 receives the encoded telephone signal and data signal output from the memory circuit 135 and the assignment information output from the error correction encoding circuit 155, as well as input via the signal line 121. Image signals are input, these signals are multiplexed according to a control signal input via signal +1!146, and output to terminal 165.

FIG. 2 is a block diagram of the telephone channel module circuit 105 in FIG. Signaling converter 20
0 is the signal line 202 for signaling signals on the telephone line.
is input via the signal line 20, converted to a signal within the audio band, and connected to the signal line 20.
1 to the adder 230. By doing so, it becomes possible to treat the signaling signal as a signal equivalent to a voice signal, and there is no need to secure a transmission path time slot for the signaling signal.

A telephone signal input via the signal line 210 is input to the PCM encoder 210 and PCM encoded, resulting in a signal 421.
1 to the echo canceller 220. Echo canceller 220 eliminates echo by creating an echo replica from the received telephone signal input via signal line 211 and subtracting it from the PCM encoded telephone signal input via signal line 221. As an echo canceller, for example, Gross Seedings of International Kan7 Arance Op Acoustics, Speech and Signal Glossec/G (Proc.
eedings of international
conference of acoustics
, 5peech and signal pr
cessing).

The method described in April 1983, pages 466-470, can be used.

The echo-cancelled telephone signal is input to adder 230 via signal line 222 and added to the signaling signal before being sent to delay circuit 240 . Output to high speed modem detector 250 and voice detector 260. To detect high-speed modem signals, use methods that take advantage of the fact that their power spectrum is different from voice signals and low-speed modem signals, and that the signal power value is constant compared to voice signals. I can do it. For example, IEEE bone transaction communication (IEEE
Transaction on Communica
tion) Vol.

Com-30, Nn4, 1982, April 739
Those described on pages 750 to 750 can be used.

In addition, as a voice detector, it is possible to use the method described in Proceedings of the National Conference of the Institute of Electronics and Communication Engineers published in 1980, paper number 2332, ``Study on adaptive threshold type voice detector''. can.

The delay circuit 240 generates a delay corresponding to the detection time required for voice detection, thereby preventing the beginning of the voice from being cut off. The high-speed modem detector 250 determines whether the input telephone signal is a high-speed modem signal or not, and outputs the result via the signal line 251. A telephone signal is input to the voice detector 260, the presence or absence of a voice signal is checked, and the result is outputted via a signal line 261. The allocation signal for each channel is multiplexed and input to the block signal holding circuit 270 via the signal line 151, and if the allocation signal corresponding to the own channel includes block information, the block signal is Outputs a signal to indicate the state via the signal line.

The line status detector 280 examines the input signaling signal, determines whether the telephone line is in use, and outputs the result via the signal line 281. ADPCM encoder 290 ADPCM encodes the input telephone signal and outputs it via signal line 291. The switch circuit 295 connects the switch to the signal line 241 when the telephone signal is a high-speed modem signal according to the output of the high-speed modem detector 250, and connects the switch to the signal line 291 in other cases.

In this way, when the input telephone signal is a high-speed modem signal, it is encoded by PCM, and other voice signals, low-speed modem signals, etc. are encoded with high efficiency by ADPCM, and the result is It will be output via the signal line 106.

The code converter 296 receives the high-speed modem detection result, the voice detection result, and the line status determination result, and then sends the result to the signal line 10.
7 as channel information.

[Code converter output]

・With high-speed modem signal... 11
1. With audio signal... 1
10・Inactive state without high-speed modem signal)...
011・Inactive state without audio signal)・
・・010・Line not in use
...001 Next, the data channel module circuit 115 and the image channel module circuit 120 will be explained with reference to FIGS. 3 and 4 showing an example thereof.

In the data channel module circuit shown in FIG. 3, it is assumed that the input data signal is input at a speed of either 32 Kbps or 64 Kbps. This is preset by switch 420. Therefore 4.8 or 9.
The low-speed data signal for 6 is 32Kbps or 64Kbps in advance.
It is assumed that several channels are multiplexed into a Kbps signal and then input. The input data signal is input to the buffer circuit 400 via the signal line 401, and the input/output speed is controlled according to the assignment signal input via the signal line 151t. After a delay of connection time is given, the signal line 11
6. The code converter 410 receives the signal [4
Whether or not there is a data signal on the data line is notified via signal 8412 and signal 117, and is output as channel information.

[Code converter output]

With 64Kbps data signal... 10164
No Kbps data signal...01132Kb
With ps data signal... 10032Kbps
No data signal...010 In the image channel module circuit shown in FIG. 4, the speed of input image data is set in advance by a switch 530. An image signal is input to the buffer circuit 500 via a signal line 501, and the input/output speed is controlled according to the allocation signal input via the signal line 151, and the necessary connections to the transmission line are provided. After a delay of hours is given,
It is output via the signal line 121. Information indicating whether or not an image signal exists in the image line and speed information of the image signal are input to the code converter 510 via a signal line 511, and after code conversion as shown in the lower part of Table 1 is performed. , is output as channel information via the signal line 122.

The assignment signal of each channel is multiplexed and inputted to the speed control signal holding circuit 520 via the signal line 151, and the speed control signal holding circuit 520 holds the speed information for its own channel and also inputs the allocation signal of each channel via the signal line 151.
04-2, the speed is specified to the external image encoding device.

Next, the assignment processor 140 in FIG. 1 will be explained. The allocation processor 140 includes telephone channel modules 105, 110 . Channel information is input from each of the data channel module 115 and the image channel module 120, and based on this, transmission time slots are assigned to each channel, and the results are output as assignment information. Table 1 shows specific examples of channel information. Here, it is assumed that channel information per channel is expressed in 3 bits.

For example, in Table 1, if the channel information is 111', when it is sent from a telephone channel or a data channel, 111 - active with a signal speed of 54 Kbps.
e voicello... // 32
Kbps 〃101 =-// 64K
bps active dataloo ・-
・ // 32KbpS 011 =
-/l 64Kbps 1nactive voic
e, dataolo... // 32
Kbps number 001 --- Unused channel 000 --- Unused module 111
... Transmission speed 1.544Mbps110
... '/768Kbps101
...' / 512Kbps100
...'/384Kbps011
... '/256Kbpa010
...'/128Kbps001
...' / 64 K b p
5O00... Unused Channel Table 1 There is a telephone signal to be encoded on that channel (ac
tive), the encoding speed of each is 64 Kbps, which means that it is encoded with 64 Kbps PCM in this case. If the channel information is '001', it indicates that the telephone or data line is not being used at all.

'ooo' indicates that the module itself is not implemented.

The channel information for the image channel/channel indicates the signal speed of the image signal, and in particular, -"000" indicates that the image channel is not connected or that the image signal does not exist.

The channel information described above is input to the processor at predetermined intervals (for example, 6 m5 ec), and based on this, transmission time slots are assigned to each channel according to the algorithm shown below.

(1) Allocate a transmission path time slot to an active data channel (a data line in which a data signal exists).

(2) Allocate time slots again based on channel information to which time slots have already been allocated among active image channels.

(3) For those who request a new time slot among active image channels, the telephone line determined by the number of required time slots is blocked, and when the number of blockages reaches the specified number, the image channel is Assign time slots.

However, the number of time slots allocated to the image channel is 3.
We will use the types (high speed, medium speed, low speed) and allocate the possible ones among them.

(4) Allocate time slots to channels that have already been allocated time slots among active telephone channels.

(5) Allocate time slots to channels that require new time slots on the first side of the active telephone channel.

(6) Assign time slots to inactive (line is in use but no signal exists) channels.

(Assign time slots to unused channels and unused modules in that order.)

Allocate transmission line time slots in the order of (1) to (7) above, or if there are no more time slots to allocate in the middle of 1) to (7), that is, if the line capacity is full, No further operations are performed and the allocation ends.

In this way, time slots are used for each channel.

'11''...Allocate a time slot of -64Kbps 1101...32i<b p
s //"01" ... Block the channel without allocating a time slot 1001 ... Do not allocate a time slot 1111 ... Allocate a high-speed time slot 1o ... - Medium speed '01'
...Slow rate 'oo' ...Time slot is not allocated This allocation information is periodic (6ms
ec), and is stored in the allocated memory for 6 m5 ec, and the same information is repeatedly read out every 125 μsec.

Next, the 7-frame format of the multiplexed signal on the transmission path will be explained. However, here the transmission line speed is 1.5
It is assumed that the speed is 44 Mbps, the number of input audio or data channels is 92 channels, and the number of image channels is 4 channels. In FIG. 5, (a) shows the frame format of a frame. One frame consists of 193 bits (=125 asec), the first 1 bit is for frame synchronization, the next 1 bit is for multiframe synchronization, and the next 7 bits (TAI) are for time slot allocation information. used and the remaining time slot (TS
1 to T846) are the parts where telephone signals, data signals, and image signals are multiplexed. Figure 5(b) is a multi-frame (l multi-frame = 48 frames = 5 msec)
This shows the format of the TAI signal in . Three TAIs constitute one set of time slot assignment signals. Furthermore, this '1' AI has 9 for every 3 TAI.
Redundant bits are provided for bit error correction, resulting in a (21,9) BCH error correction code as a whole, and the time slot allocation information has strong resistance to transmission path bits t+. It is held. FIG. 5C shows the format of multiframe bits (MF bits) in one multiframe. The shaded bits are the bits used for multi-frame synchronization, and the other bits can be used as alarm-related bits for game management and the like.

Next, an embodiment of the time division multiplex reception method of the first invention will be described with reference to the drawings together with an embodiment of the time division multiplex reception apparatus of the third invention.

FIG. 6 shows a block diagram of one embodiment. In the figure, a signal in which a telephone signal, a data signal, two painter signals, etc. are multiplexed is input to a first separation circuit 600 via a signal line 601, and a telephone signal and a telephone signal are input in accordance with a control signal output from a control circuit 640. The data signal is separated into a multiplexed signal, allocation information, and image signal, and signal lines 602, 603, 604
Output via . Memory circuit 610 stores telephone signals and data signals, and time slot conversion of the signals is performed in accordance with the assignment signal input via signal 481631.

The second separation circuit 650 receives the time slot-converted data signal and telephone signal in a multiplexed form.
are separated into their respective corresponding channels. The error correction circuit 620 performs error correction on the input allocation information, and the result is input to the allocation memory 630 and the ttilJ control circuit 640 via the signal line 621.

The control circuit 640 controls the first separation circuit 60 according to the allocation information.
Outputs a control signal for controlling the 0 separation operation. Allocation information is input to the allocation memory 630, and the signal line 631
is read out repeatedly via .

Telephone channel module circuit 660 has signal line 631
32K telephone signal depending on the assigned signal input through
Decode with ADPCM or 64KPCM. Further, the data channel module circuit 680 outputs the input data signal in a format suitable for transmission. In the image channel module circuit 690, the data signal input via the signal line 604 is output in accordance with the transmission rate indicated by the allocation signal input via the signal line 631.

FIG. 7 is a block diagram showing an example of the telephone channel module circuit 660 in FIG. 6 in more detail. A telephone signal input via the signal line 651 is input to the signal line 631.
When Al)PCM is designated by the assignment signal input via the signal line 701, it is input to the ADPCM decoder 720 and decoded into a PCM code; otherwise, it is input to the switch circuit 7 via the signal line 702. .30 is entered. In the switch circuit 730, when AI) PCM is specified by the assignment signal input via the signal line 631, the switch is connected to the signal line 721, and the PCM
When specified, the switch is connected to the signal line 702, and otherwise, the switch is connected to the signal line 711.

Since no signal is sent to the receiving side when there is no voice signal or the like in the telephone channel of the transmitter 710, the noise generator 710 generates pseudo noise on the receiving side to make it easier for the listener to hear. It makes it seem as if there is line noise coming from the transmitting side. PCM decoder 7
A voice signal or a noise signal is inputted to 40 via a switch circuit 730, decoded, and output. The received signal output from the switch circuit 730 is input to the signaling signal device 750, and the signaling signal is reproduced.

FIG. 8 is a block diagram of an example of the data channel module circuit 680 in FIG.

A data signal is inputted to the buffer circuit 800 via the signal line 653, and the data signal is outputted according to the input/output speed specified by the allocation information inputted via the signal line 631.

FIG. 9 is a block diagram of an example of the image channel module circuit 690 in FIG. The image signal inputted via the signal line 604 is input/outputted according to the input/output speed specified by the allocation information inputted via the signal line 631. Also, the speed control signal generation circuit 9
Reference numeral 10 generates transmission speed information for the image signal specified by the allocation information, and outputs a speed control signal to an external image encoding device.

<Effects of the Invention> As explained above, the present invention adaptively allocates transmission path time slots according to the traffic characteristics of telephone signals, data signals, and image signals, and also applies high-efficiency coding to telephone channels. telephone signals to be transmitted,
As a result of multiplexing only one data signal and one painter signal, there is an effect that the utilization efficiency of the transmission line can be greatly increased compared to the conventional method.

[Brief Description of the Drawings] Fig. 1 is a block diagram showing an embodiment of the second invention;
The figure is a block diagram of an example of the telephone channel module circuit in Figure 1, Figure 3 is a block diagram of an example of the data channel module circuit in Figure 1, and Figure 4 is a block diagram of an example of the image channel module circuit in Figure 1. A block diagram of an example, FIG. 5 is a diagram showing an example of the frame format in FIG. 1, FIG. 6 is a block diagram of an embodiment of the third invention, and FIG. 7 is a telephone channel module of FIG. 6. FIG. 8 is a block diagram of an example of the data channel module circuit in FIG. 6. FIG. 9 is a block diagram of an example of the image channel module circuit in FIG. 6. . 105.1jO...Module circuit for telephone channel, 115...Module circuit for data channel, 120...Module circuit for image channel, 125...1st multiplexing circuit, 13
0...Second multiplexing circuit, 135...
Memory circuit, 140... Allocation processor, 14
5...Control circuit, 150...Assignment memo'J, 155...Error correction encoding circuit, 160
---Third multiplexing circuit, 200, signaling converter, 210, PCM encoder,
220...Echo canceller, 230...
...Adder, 240...Delay circuit, 250.
...High-speed modem production device, 260 ... Voice detector, 270 ... Blockage signal holding circuit, 280
・・・・・・Line status detector, 290・・・・・・AD
PCM encoder, 295...S・ftsuchi, 296
... code converter, 400 ... buffer circuit, 410 ... code converter, 420 ...
...Switch, 500...90. buffer circuit, 51
0... Code converter, 52°... Speed control signal holding circuit, 600... First separation circuit,
610...Memory circuit, 620...Error correction circuit, 630...-Allocation memory, 640...
...Control circuit, 650...Second separation circuit, 660, 670...Modile circuit for telephone channel, 680...Module circuit for data channel, 690 ...Module circuit for image channel, 700...Switch circuit, 71
0...Noise generator, 720...A D
PCM decoder, 730...switch circuit,
740...PCM No.1! , 750...
Signaling converter, 800...Buffer circuit, 900...Buffer circuit, 910...
・Speed control signal holding circuit. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] 1. When time-division multiplexing telephone signals, data signals, and image signals input from a plurality of telephone lines, data lines, and image lines, the telephone signals, data signals, and In a time division multiplexing transmission/reception method in which the telephone signal, the data signal, and the image signal are multiplexed only on a line for which it is determined that a signal or image signal exists, on the transmitting side, at least two One of the above encoding methods is selected to encode the telephone signal, and when multiplexing the image signal, a predetermined number of vacant telephone lines are selected from among the telephone lines determined to be vacant lines. Multiplexing is performed after blocking the telephone line, and it indicates which line's signal is multiplexed among the plurality of telephone lines, data lines, and image lines, and also indicates the encoding method for the voice line. The encoded telephone signal, the data signal, and the image signal are multiplexed and transmitted with assignment information also indicating the type, and the receiving side extracts the assignment information from the multiplexed signal sent. a telephone signal encoded in said multiplexed signal according to assignment information;
The data signal and the image signal are distributed to each corresponding line, and the telephone line is decoded by selecting one from at least two or more decoding methods according to the allocation information. A time division multiplex transmission/reception method. 2. at least one telephone channel module circuit which receives a telephone signal input from a telephone line and encodes the telephone signal in accordance with an assignment signal; and a module circuit which receives a data signal input from a data line and encodes the telephone signal according to the assignment signal; at least one module circuit for a data channel that converts an image signal inputted from an image line into a format suitable for multiplexing according to the assigned signal; an image channel module circuit; a first multiplexing circuit that receives and multiplexes the encoded result of the telephone signal and the data signal output from the telephone channel module circuit and the data channel module circuit; a memory circuit which inputs the multiplexed signal output from the first multiplexing circuit and performs writing and reading according to the allocation signal; and an audio signal output from each of the module circuits to the telephone line, data line and image line. , a second multiplexing circuit that receives and multiplexes channel information representing the presence or absence of a data signal or image signal, the usage state of the line, and the input signal speed; and a multiplexing circuit output from the second multiplexing circuit. an allocation processor which receives the converted channel information and determines the number of transmission path time slots to be allocated to the telephone signal, data signal and image signal based on the channel information; and an allocation processor which stores the allocation information outputted from the allocation processor; an allocation memory that outputs an allocation signal; an error correction encoding circuit that receives the allocation information as input and performs error correction encoding; a control circuit that receives the allocation information as input and generates a control signal necessary for multiplexing; a third multiplexing circuit that multiplexes a multiplexed signal output from the memory circuit according to the signal, allocation information output from the error correction encoding circuit, and an image signal output from the image channel module circuit; The telephone channel module circuit selects and encodes one of at least two encoding circuits depending on the type of the input telephone signal, and also encodes the vacant telephone line according to the assignment signal. A time division multiplex transmission device characterized by performing blocking. 3. A multiplexed signal in which encoded telephone signals, data signals, image signals, and transmission path time slot allocation information are multiplexed is input, and the telephone signal, data signal, and image signal are extracted from the multiplexed signal according to the control signal. and a first separation circuit that separates the allocation information; a memory circuit that receives the telephone signal and data signal output from the first separation circuit and performs time slot conversion according to the allocation signal; and the memory circuit. a second separating circuit which inputs the telephone signal and data signal multiplexed and outputted from and distributes them to corresponding channels; and an error correction circuit which receives the allocation information outputted from the first separating circuit as input and performs error correction. a correction circuit; an allocation memory that stores the allocation information output from the error correction circuit; and a control signal necessary for controlling the first separation circuit using the allocation information output from the error correction circuit as input. at least one input control circuit that receives the telephone signal output from the second separation circuit and the assignment signal output from the assignment memory and decodes the telephone signal according to the assignment signal; at least one data channel module circuit that receives the data signal output from the second separation circuit and converts it into a format suitable for transmission according to the assignment signal; at least one module circuit for an image channel which inputs an image signal output from a separation circuit of the telephone and converts it into a format suitable for transmission according to the assigned signal, and the module circuit for a telephone channel receives the input image signal from the telephone A time division multiplex receiver comprising at least two decoding circuits depending on the type of signal, and selecting one of the decoding circuits based on the assigned signal for decoding. .