JPS63157538A - Reception method for time division multiplex signal and device therefor - Google Patents

Abstract

PURPOSE:To efficiently use a transmission line by adaptively multiplexing a channel in which a significant signal exists among plural channels of different bit rates. CONSTITUTION:A reception device has a first separation circuit 110, a memory circuit 120, a time slot control circuit 130 and a second separation circuit 140. The first separation circuit 110 sets a multiplex signal to an input, and separates a multiplexed input channel from multiplexed information. The memory circuit 120 changes a multiplexing order of a multiplexed input channel signal outputted from the first separation circuit 110 in accordance with the output of an assignment information memory in the time slot control circuit 130 and outputs said signal. The second separation circuit 140 separates the output from the memory circuit 120 into output channels corresponding to the input channels. The time slot control circuit 130 finds the constitution of the channel in the multiplexed signal from a transmission side based on assignment information, and outputs assignment information to the memory circuit 120.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a time division multiplexed signal reception method and apparatus, and more specifically, to a method for collectively accommodating a plurality of channels with different bit rates. The present invention relates to a method and apparatus for receiving signals that are efficiently and flexibly time-division multiplexed using a high-speed digital dedicated line or the like.

[Conventional technology]

Conventionally, when transmitting a plurality of channels by time division multiplexing, the bit rate of each channel was almost always the same. For example, a PC that multiplexes 24 channels of audio lines using a 1.544 Mbps digital line.
In M24 line transmission equipment, all channel bit rates are 6
It is 4 kbps. In addition, even when multiplexing channels with different bit rates, each channel is often multiplexed in a fixed or semi-fixed manner, and if the number of channels or bit rate changes manually, the multiplexing system It was necessary to temporarily stop the operation of the system and make system changes.

[Problem that the invention seeks to solve]

However, in recent years, due to the development of audio encoding technology and the accompanying diversification of services, different bit rates have come to be used for each channel depending on the service and transmission quality. There is a need for something that can flexibly respond to rate changes, input channel configuration changes, and even traffic fluctuations without causing momentary communication interruptions, and conventional technology cannot meet these demands. .

In view of the shortcomings of the prior art, an object of the present invention is to efficiently (multiplex) multiple input channels with different bit rates, and to overcome changes in bit rate and input channel configuration, as well as traffic fluctuations, etc. It is an object of the present invention to provide a highly efficient and flexible method and apparatus for receiving signals multiplexed by time division multiplexing that can be flexibly handled.

[Means for solving problems]

The time-division multiplexed signal reception method of the present invention prioritizes active channels in which a significant signal exists over inactive channels among a plurality of input channels with different bit rates, and channels input channels with the same bit rate within a transmission path frame. are grouped and multiplexed, and if a new active channel occurs among unmultiplexed inactive channels, an input channel with the same bit rate as this new active channel is placed in the multiplexed group or before that group. or selecting at least one inactive channel according to a predetermined priority order from input channels of other bit rates that are later multiplexed, and multiplexing the new active channel in place of this inactive channel; In addition, in order to arrange a predetermined number of inactive channels at predetermined positions in the group within the frame, in order to cope with the occurrence of a new active channel when a new active channel does not occur, the inactive channels within the group are arranged at predetermined positions. The receiver receives input channels that are multiplexed and transmitted in such a way as to move the multiplexed input channels and multiplexing information indicating changes or movements of the multiplexed input channels, and multiplexes the input channels that have been multiplexed and transmitted It is characterized by separating and outputting into corresponding output channels according to multiplexing information.

Further, in the time division multiplexed signal receiving device of the present invention, among a plurality of input channels having different bit rates, an input channel where a significant signal exists is multiplexed with priority over an input channel where no significant signal exists, and the multiplexed information is multiplexed. a first demultiplexing circuit which receives a multiplexed signal sent together with the multiplexed signal and separates the multiplexed input channel and the multiplexed information from the multiplexed signal; and the multiplexed signal outputted from the first demultiplexing circuit. multiplexed information decoding means for decoding information; an allocation information memory for updating the contents of the memory according to the output of the multiplexed information decoding means; and a multiplexed input channel signal output from the first separation circuit. A memory circuit that changes the multiplexing order and outputs the information according to the output of the allocation information memory, and a second separation circuit that separates the output of the memory circuit into output channels corresponding to the input channels. It is said that

[Effect]

° Normally, voice, data, and image signals are not always present in telephone lines, data lines, and image lines; for example, in voice lines, voice signals are actually present only about 40% of the time. is statistically known, and the time during which significant information is actually sent on data lines and image lines is only a fraction of the total time. Focusing on this point, transmission paths can be effectively utilized by giving priority to channels in which significant signals exist among a plurality of input channels, time-division multiplexing, and transmitting the signals. For example, conventionally 48
If this principle is applied to a transmission path that multiplexes audio channels, it is possible to transmit about 100 audio channels using the same transmission path. The present invention is used for a multiplexing device that collectively accommodates various channels with different bit rates and uses the above-mentioned principle, and groups channels by bit rate and multiplexes them within a transmission path frame. It is possible to receive multiplexed signals using a multiplexing method that can improve transmission efficiency by efficiently using the transmission path time slots in the entire group by exchanging time slots in frames between each group. can. That is, a time slot within a transmission line frame is fixedly assigned for each bit rate, and only that time slot is used to perform meaningful transmission.

When multiplexing channels with high signal (active channels) with priority, when there is a shortage of time slots due to an increase in the number of active channels, even if there are unused time slots for other bit rates, Whereas that timeslot is not available,
In the multiplexed signal received using the present invention, channels to be transmitted for each bit rate are grouped, and the number of time slots allocated to each group can be made variable depending on the traffic. Specifically, at the boundary of each group, inactive channels that can accommodate one channel of the adjacent group are placed, and when the adjacent group runs out of time slots, the inactive channel for this inactive channel is placed. By immediately supplying time slots to adjacent groups, each group can mutually compensate for the lack of time slots, making it possible to use the transmission path effectively over the entire input channel.The received signal is multiplexed. It contains multiplexing information indicating changes or movements of input channels that have been input, and input channels that have been multiplexed and sent are separated into corresponding output channels and output according to this multiplexing information.

〔Example〕

Next, the present invention will be described and explained with reference to the drawings.

1 and 2 show an embodiment of the present invention,
FIG. 1 is a block diagram of a time division multiplexed signal receiving apparatus, and FIG. 2 shows the configuration of its time slot (TS) management circuit.

Moreover, FIGS. 3 to 6 show the configuration of the transmitting side.

First, for convenience of explanation, an example of a time division multiplexed signal receiving method according to the present invention and a time division multiplexed transmitting apparatus corresponding to the apparatus will be described with reference to FIGS. 3 to 6. FIG. 3 is a block diagram showing an example of a time division multiplex transmission device.

As shown in FIG. 3, the time division multiplex transmission device includes a first multiplexing circuit (MUX1) 310, a channel memory circuit 320, a second multiplexing circuit (MUX2) 330,
It has a time slot (TS) management circuit 340.

The first multiplexing circuit 310 is a circuit that multiplexes a plurality of input channels. The channel memory circuit 320 is a memory circuit that writes or reads the multichannel signal output from the first multiplexing circuit 310 in accordance with the output of an allocation information memory, which will be described later, in the time slot management circuit 340. The multiplexing circuit 330 connects the first multiplexing circuit 3 via this channel memory circuit 320.
This is a circuit that multiplexes the output of 10 and multiplexed information, which will be described later.

The time slot management circuit 340, as shown in FIG.
Channel state memory 400 and allocation information memory 410
and a new active channel (ACH) detection circuit 42
0, a time slot (TS) allocation circuit 430, and a group condition determination circuit 440.

The channel state memory 400 is a memory that stores channel state signals indicating the presence or absence of significant signals of a plurality of input channels and their bit rates, and the allocation information memory 41
0 is a memory that stores channel allocation information indicating which channel is multiplexed on the transmission path among the plurality of input channels, and this allocation information memory 410
The output of is applied to channel memory circuit 320 shown in FIG.

The new active channel detection circuit 420 is a circuit that detects a new active channel in which a new significant signal has been generated based on the output signals of the allocation information memory 410 and the channel state memory 400. Group condition determination circuit 44
0 indicates that, from the allocation information output from the allocation information memory 410, a predetermined number of inactive channels in which no significant signal exists among the channels grouped by bit rate in the transmission line frame are at the beginning of the group. , and the time slot allocation circuit 430 includes the allocation information memory 410 and the new active channel detection circuit 4.
20 and the output of the group condition determination circuit 440, this circuit outputs multiplexing information for updating and moving multiplex channels within the transmission path frame, and this multiplexing information is output to the allocation information memory 410. together with the third
It is adapted to be added to the second multiplexing circuit 330 shown in the figure.

When transmitting by a transmitting device having such a configuration, when multiple input channels with different bit rates are time-division multiplexed and transmitted, a manual channel (active channel) in which a significant signal exists among the input channels is Input channels with the same bit rate are grouped and multiplexed within a transmission path frame, giving priority to input channels (inactive channels), and when a new active channel occurs among unmultiplexed inactive channels, this new active channel is At least one channel according to a predetermined priority among input channels of other bit rates that are multiplexed within a group in which input channels of the same bit rate as the channel are multiplexed, or that are multiplexed immediately before or after this group. selects an inactive channel and multiplexes a new active channel in place of the inactive channel, and if no new active channel occurs, a predetermined number of inactive channels are added at the beginning and end of each group in the frame. This is done by moving the inactive channels within the group in order to arrange the active channels, and transmitting the input channels thus multiplexed and the multiplexing information indicating the change or movement of the multiplexed input channels.

Further, the time division multiplex transmission method will be explained with reference to FIGS. 5 and 6.

N-channel signals from CHI to CHN, indicated by reference numeral 300, are input to a first multiplexing circuit (MUXI) 310, multiplexed, and then input to a memory circuit 320 via a signal line 311. The memory circuit 320 writes only the signals of the channels to which the transmission line time slots are assigned among the input channels in accordance with the control signal input from the time slot (TS) management circuit 340 via the signal line 341, This is read out via the signal line 321 and output to the second multiplexing circuit (MUX2) 330. Channel information indicating the bit rate and significant signal of each input channel is input to the (TS) management circuit 340 via the signal line 350, and based on this channel information, the time slot in the transmission path frame is assigned a significant signal. Channels with existing channels are allocated preferentially. This allocation of time slots will be described in detail later using FIG. 4. The TS management circuit 340 outputs multiplexing information for notifying the receiving side of changes in the multiplexed channel via the signal line 342, and this information is sent to the second multiplexing circuit (MUX2) 330 via the signal line. The signal line 3 is multiplexed with the multiplexed channel signal input via the signal line 321.
31. Further, the TS management circuit 340 outputs to each channel via a signal line 343 a signal indicating whether or not a transmission line time slot is assigned to the input channel. Each channel unit or module uses this assignment information to know whether or not its own channel is multiplexed, and if it is not multiplexed, it can, for example, temporarily store transmission data in a buffer and assign a time slot. Deterioration of encoding quality can be prevented by making the audio encoder wait, or by stopping the operation of the audio encoder in synchronization with the decoder so that the internal state remains the same for both transmission and reception.

In FIG. 4, which is an example of the TS management circuit 340 in FIG.
A new active channel (
A CI() is input to the detection circuit 420. The channel information indicates the presence or absence of a significant signal in the input channel and its bit rate, and information from channel 1 to channel N is multiplexed in a time-division manner. On the other hand, the allocation information informs whether or not each manual channel is currently multiplexed on a transmission path in order of channel number, similar to the channel information. Based on this information, the new active channel (A CH) detection circuit 420 detects a so-called new active channel in which a significant signal has occurred among channels that are not currently multiplexed, and assigns the channel number and bit rate to the time slot. (TS) Assignment circuit 4
30 to request time slot allocation. The group condition determination circuit 440 receives the above-mentioned allocation information as input and checks how the transmission path time slots are allocated to the input channels.The input channels are grouped by bit rate, and the beginning and end of each group are It is determined whether a predetermined number of inactive channels are arranged in the 441, and if not, it is determined via the signal line 441 in which group and in which position the inactive channels should be arranged. The TS allocation circuit 430 is notified. The TS allocation circuit 430 checks what kind of multiplexing is currently being performed from the allocation information output from the allocation information memory 410, and assigns a new AC.
Based on a new connection request and a request to move an inactive channel to the group end from the H detection circuit 420 and the group condition determination circuit 440, the currently used transmission path time slot is assigned to a new active channel, and the existing multiplexed channel is Decide on changes to the position within the frame, etc.
The result is sent to the allocation information memory 41 via a signal line 431.
A signal line 342 is used to update the time slot allocation information and also send the same information to the receiving side.
The second multiplexing circuit (MUX2) in FIG.
The allocation result is also output to 330.

5 and 6 are flowcharts and transmission line frame formats for explaining the operation of this TS allocation circuit 430 in more detail. Each step (Sl-
The process of S8) will be explained. In step S1, data is read from the outside. This data includes the allocation information from the allocation information memory 410 described above and the new AC
These are the time slot allocation request and group condition determination results output from the H detection circuit 420 and the group condition determination circuit 440. In step S2, the time slot allocation requests among these are checked, and if any of the previously unconnected channels has generated a significant signal and become active, the process advances to step S3; otherwise, , the process moves to step S4. In step S3, it is checked whether or not there is an empty time slot to be allocated to the channel for which a new allocation request has been made among the time slots in the current transmission path frame. Here, this empty time slot will be explained using an example of the transmission path frame format shown in FIG. In the example shown in FIG. 6, N types of bit rates (B
l, B2. ...BN) channels are grouped into groups (Gl, G2. ・
...GN). In this configuration, the lowest speed (B1
) channels are multiplexed and transmitted using one time slot (TS) per channel, and the second . Third group G2. G3 has 2 channels each compared to G1.
If channels with double and quadruple bit rates (B2.B3) are grouped and multiplexed, then G2. G3
In this case, 2 TS and ATS are required for each channel. Note that A and I in the frame mean an active channel and an inactive channel, respectively.

Further, AM in the frame indicates an assignment message for notifying the receiving side of a time slot allocation change, and f is a bit for frame synchronization. Well, now,
- As an example, assuming that the bit rate of the channel for which the new time slot allocation request was made in step S3 of FIG. 5 is 32, it is determined whether or not a time slot can be allocated to this channel. This is possible if there is at least one inactive channel in group G2, and even when there is no inactive channel in group G2, the adjacent group G1. The right end of G3,
If there is an inactive channel at the left end that can accommodate one channel of bit rate B2, it is possible to allocate time slots using this inactive channel.

Therefore, if there are two ■ channels at the right end of group G1 or one I channel at the left end of group G3, they can be assigned even if there is no channel in group G2, and in this case, the step New allocation information is created in S5. However, G
2. Right end of Gl.

Inactive channels other than the left end of G3 are not allocated, and groups for each bit rate are not broken. When doing this, it prevents multiple time slots from being assigned to a channel at random, simplifies overall control, and
Because you can secure multiple consecutive time slots,
The time required for time slot assignment and the length of an assignment message for sending assignment information to the receiving side can be reduced.

In this way, multiple input channels C with different bit rates
In a time division multiplex transmission method in which HI to CHN are time division multiplexed and transmitted, an input channel (active channel) in which a significant signal exists among input channels CH1 to CHNO is divided into an input channel (inactive channel) in which a significant signal does not exist.
Input channels with the same bit rate are grouped and multiplexed within a transmission path frame, giving priority to input channels with the same bit rate ( In the present example, the input channel B2) is predetermined from among the input channels of other bit rates that are multiplexed within the group being multiplexed (02 in the present example) or immediately before or after this group. At least one inactive channel is selected according to the assigned priority order, and a new active channel is multiplexed in place of this inactive channel.

In this way, each group expands its own group by invading the I-channel at the edge of the adjacent group when there is no ■ channel in its own group, that is, when traffic becomes busy. Group boundaries automatically move according to traffic, and time slots can be used effectively as a whole. In order for the boundaries of each group to move smoothly according to the traffic, the sixth
CI, G2. As shown in G3, I channels for boundary movement may be always arranged at both ends of each group so that time slots can be exchanged with adjacent groups immediately. For this purpose, it is determined in step S4 in FIG. 5 whether there are at least as many channels as the number of time slots for one channel in the adjacent group at the end of each group. If there is a shortage of ■ channels at the end of the group in step S4, the necessary number of I channels in the group are moved to the end of the group in step S6.

In this way, the inactive channels within the group are moved so that a predetermined number of inactive channels are placed at the beginning and end of the group in each group within the frame, and in step S6 of FIG. Assignment change information is created to move a predetermined number of I channels to the group end. If there is no new allocation request or insufficient group end conditions, refresh (REFRESH) is performed in step s7! Information is created. This refresh information is transmitted and received by transmitting the multiplexing status within the frame (which channel is multiplexed to which time slot) to the receiving side when there is no change in the multichannel configuration within the frame. This is to match the multiplexing status at the time, and it plays the role of error correction when an incorrect assignment message (AM) is sent to the receiving side due to a transmission line bit error before that time. In step s8, step S5
, 36 or S7 is output as allocation information.

Time slot (TS) allocation circuit 43 shown in FIG.
0, such processing is performed, and its output is given to the second multiplexing circuit 330 shown in FIG.
In this way, the multiplexed input channels and multiplexing information indicating change or movement of the multiplexed input channels are transmitted.

Next, reception of such a transmission signal will be explained using FIG. 1 and FIG. 2.

As shown in FIG. 1, the receiving device includes a first separation circuit (D
EMUX 1) 110, a memory circuit 120,
It has a time slot (TS) management circuit 130 and a second separation circuit (DtJMUX2) 140.

The first separation circuit 110 multiplexes an input channel in which a significant signal exists among a plurality of input channels having different bit rates in preference to an input channel in which no significant signal exists, and receives a multiplexed signal sent together with multiplexed information. This is a circuit that receives input signals and separates multiplexed input channels and multiplexed information from this multiplexed signal. The memory circuit 120 is a circuit that changes the multiplexing order of the multiplexed input channel signal output from the first separation circuit 110 in accordance with the output of an allocation information memory to be described later in the time slot management circuit 130 and outputs the multiplexed input channel signal. The second separation circuit 140 is a circuit that separates the output of this memory circuit 120 into an output channel corresponding to an input channel.

The time slot management circuit 130, as shown in FIG.
It consists of an assignment information memory 200 and an assignment (AM) signal decoding circuit 210.

The assignment signal decoding circuit 210 is a circuit that receives and decodes the multiplexed information output from the first separation circuit 110, and the assignment information memory 200 decodes the memory contents according to the output of the decoding circuit 210. The memory to be updated is such that the output of this allocation information memory 200 is given to the memory circuit 120 shown in FIG.

The receiving device selects the multiplexed signal from the transmitting side explained using FIGS. 3 to 6, that is, the input channel (active channel) in which a significant signal exists among the plurality of input channels with different bit rates. Input channels with the same bit rate are grouped and multiplexed within a transmission path frame, giving priority to input channels that are not multiplexed (inactive channels), and when a new active channel occurs among unmultiplexed inactive channels, this At least according to a predetermined priority among input channels of other bit rates that are multiplexed within a group in which input channels of the same bit rate as the new active channel are multiplexed, or immediately before or after this group. Selecting an inactive channel of l channel and multiplexing an active channel in place of this inactive channel,
If no new active channels occur, the inactive channels within the group are moved so that a predetermined number of inactive channels are placed at the beginning and end of each group in the frame, and multiplexing is performed in this way. The multiplexing information indicating the change or movement of the multiplexed input channel and the input channel that is sent as a multiplexed input channel are received.

As shown in FIG. 1, a received signal input via a signal line 100 is separated into an assignment message and a multichannel signal by a first separation circuit (DEMUXI) 110, and the received signal is input via signal lines 111 and 112, respectively. and is input to the memory circuit 120 and the TS management circuit 130. In the memory circuit 120, multi-channel signals that are randomly multiplexed and input with respect to channel numbers are rearranged in order of channel numbers according to the assignment information that is input via the signal line 131 from the TS management circuit 130, and are sent via the signal line 121. Output. Second separation circuit (DUMU
In X2) 140, each channel signal is separated and output to each channel via the signal line group 150. The TS management circuit 130 learns the channel configuration in the multiplexed signal sent from the transmitting side based on the assignment information input via the signal line 121, and outputs the assignment information to the aforementioned memory circuit 120. , outputs information indicating whether or not the signals of each channel are currently multiplexed via the signal line 132. Based on this information, each channel unit, unit, or module sends a synchronization flag bit to the receiving terminal when it is not multiplexed in the case of a data line, or sends a synchronization flag bit to the receiving terminal in the case of a voice line, based on this information. By stopping the operation in synchronization with the encoder on the transmitting side, control is performed such that the internal state of transmission and reception remains the same and quality deterioration does not occur during remultiplexing. , 1st
In FIG. 2, which is an example of the TS management circuit 130 shown in the figure, an assignment message (AM) separated from the received signal is input to the AM signal decoding circuit 210 via the signal line 112, and is input into the transmission path frame. What kind of change has occurred in the configuration of the multiplexed channel group is decoded, and a signal for updating the allocation information memory 200 is outputted via the signal line 211 in accordance with this.

A map is created in the allocation information memory 200 that shows which channel is multiplexed into which time slot in the currently transmitted frame, and is updated sequentially by the signal from the AM signal decoding circuit 210 mentioned above. , the same map as that on the transmitting side is created, and control signals are outputted to the aforementioned memory circuit 120, each channel unit, etc. via signal lines 131 and 132 based on this map.

In this way, the receiving device receives the multiplexed and transmitted input channels and the multiplexing information indicating the change or movement of the multiplexed input channels, and receives the multiplexed and transmitted input channels. The channels are separated into corresponding output channels according to the multiplexing information, and each channel is output as a signal.

Note that each of the embodiments described above may be performed by software control instead of hardware, and in particular, T
The S management circuit may be implemented by a commercially available microprocessor.

Further, although the embodiment does not specifically limit signals sent through multiple channels, it is obvious that the present invention is effective even when a single medium such as voice, data, and images or various types of media are mixed. be.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to efficiently receive a multiplexed signal that is adaptively multiplexed on channels in which a significant signal exists among a plurality of channels with different bit rates, and to improve the efficiency of the transmission line. It is extremely effective in achieving various uses.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram of an example of the time slot (TS) management circuit of FIG. 1, and FIG. 3 is a time division multiplex transmitter corresponding to the present invention. Figure 4 is a block diagram of an example of the time slot (TS) management circuit in Figure 3. Figure 5 is a flowchart of an example of its processing contents. It is a figure showing an example. 110...First separation circuit (DEMUXI) 12
0...Memory circuit 130...Time slot (TS) management circuit 140
...Second separation circuit (DEMUX2) 200 ・
... Assignment information memory 210 ... Assignment (AM) signal decoding circuit 300 ... Input channel group 310 ... First multiplexing circuit (MUXI) 320
...Channel memory circuit 330 ...Second multiplexing circuit (MUX2) 340
...Time slot (TS) management circuit 400 ・
...Channel status memory 410 ...Assignment information memory 420 ...New active channel (ACH) detection circuit

Claims (3)

[Claims] (1) Among multiple input channels with different bit rates, active channels with significant signals are given priority over inactive channels, input channels with the same bit rate are grouped and multiplexed within a transmission path frame, and unmultiplexed channels are grouped and multiplexed. When a new active channel occurs in an inactive channel, other bits are multiplexed within the group where the input channel with the same bit rate as the new active channel is multiplexed, or before or after the group. Selecting at least one inactive channel from among the rate input channels according to a predetermined priority order and multiplexing the new active channel instead of this inactive channel, and when no new active channel occurs, is multiplexed by moving the inactive channels within the group to place a predetermined number of inactive channels in a predetermined position in the group within the frame in order to accommodate the occurrence of a new active channel. Receives the transmitted input channel and multiplexing information indicating change or movement of the multiplexed input channel, and separates the multiplexed input channel into corresponding output channels according to the multiplexed information. 1. A method for receiving a time division multiplexed signal, the method comprising: outputting a time division multiplexed signal. (2) In the method for receiving a time division multiplexed signal according to claim 1, the multiplexed signal to be sent is configured to receive input signals from input channels of other bit rates when the new active channel is generated. The active channel is selected from among the input channels of other bit rates that are multiplexed immediately before or after the group in which the input channels of the same bit rate as the newly generated active channel are multiplexed. A time-sharing method characterized in that when a new active channel does not occur, the inactive channel is moved so that the inactive channel is placed at the beginning and/or end of the group in each group. How to receive multiplexed signals. (3) input a multiplexed signal in which an input channel with a significant signal among a plurality of input channels with different bit rates is multiplexed with priority over an input channel without a significant signal and sent together with multiplexed information; a first separation circuit that separates the multiplexed input channel and the multiplexed information from the multiplexed signal; a multiplexed information decoder that decodes the multiplexed information output from the first separation circuit; an allocation information memory for updating the contents of the memory in accordance with the output of the multiplexed information decoding means; and multiplexing the multiplexed input channel signal output from the first separation circuit in accordance with the output of the allocation information memory. 1. A time-division multiplexed signal receiving device comprising: a memory circuit that changes the order of the signals and outputs the signals; and a second separation circuit that separates the output of the memory circuit into output channels corresponding to input channels.