JPH02246637A - Digital multiplex transmitter - Google Patents

Abstract

PURPOSE:To use a line efficiently by discriminating whether or not a bit of a retarded data and that of an inputted non retarded data are identical to each other and discriminating and detecting the presence of a data not subject to packet processing accurately. CONSTITUTION:A fixed pattern detector 17 detects the presence of a data not subject to packet processing to control a selector 16. The selector 16 outputs selectively either a packet data or a data not subject to packet processing. A fixed pattern generator 23 outputs a data retarded by a prescribed frame and not subject to packet processing when a received digital data is a prescribed fixed pattern and outputs an inputted data not subject to packet processing as it is when a prescribed fixed pattern is not provided. Thus, the transmission line is efficiently utilized independent of the kinds of terminal equipments.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a digital multiplexing transmission device that inserts and transmits packet data into silent sections of audio signals for highly efficient multiplexing, and provides efficient transmission paths regardless of the type of terminal, etc. The first selection means selects and outputs the audio data between the audio data and the packet data, and selectively outputs the packet data during a silent period when the audio data does not exist. , a second selection means for selectively outputting the unpacketized data from the terminal and the data that is normally not packetized out of the packet data, and selectively outputting the packet data during a period when the unpacketized data does not exist; A digital multiplexing transmission device comprising a multiplexing section that multiplexes each output data of the first and second selection means and sends it to a transmission path, the delay circuit delaying the non-packetized data by a certain frame; A determination circuit that determines whether input data and output data of the circuit have the same value; and a determination circuit that determines whether the unpacketized data does not exist when the determination output of the same value is continuously obtained from the determination circuit for a certain number of frames. and a detection circuit that outputs a detection signal shown as a control signal for the second selection means and also outputs it to the multiplexing section.

(Industrial Application Field) The present invention relates to a digital multiplex transmission device, and more particularly to a digital multiplex transmission device that inserts packet data into a silent section of an audio signal and transmits the signal in order to achieve high efficiency multi-Φ.

In recent years, digital communication networks have become increasingly wide-area, including international lines, and equipment costs have accordingly increased, so it is necessary to use digital lines as efficiently as possible.

(Prior Art) Fig. 6 shows a block diagram of an example of the main parts of a conventional digital multiplex transmission device. In the figure, voice data from a switch (not shown) and packet switch (not shown) are transmitted. The packet data is input to the selector 1, while the audio data is supplied to the audio detection circuit 2, where the presence or absence of audio is detected.

The sound detector 2 controls the selector 1 so that the sound data is selectively output during the sound period 111 where the sound data exists,
During a silent period when no audio data exists, the selector 1 is set to $111 so that packet data is selectively output.

On the other hand, packet data and data from a terminal (not shown) are respectively input to the selector 3, and the data is supplied to the data detection circuit 4. The data detection circuit 4 detects the presence or absence of data based on the bit pattern between certain frames, and the selector 3 detects the presence or absence of data based on the bit pattern between certain frames.
is controlled to selectively output data, and during one period of no data, the selector 3 is controlled by ti11 to selectively output packet data.

A multiplexing block 5 time-division multiplexes the output data of the selectors 1 and 3 and the detection results from the voice detector 2 and the data detector 4, respectively, and sends the multiplexed data to the communication line.

In this way, packet data can be transmitted instead of audio data during silent periods, and packet data can be transmitted instead of unpacketized data during periods of no data, so that audio data, packet data, and packetized It is possible to multiplex transmit data to the same communication line with high efficiency.

[Problem to be solved by the invention]

However, the above-mentioned conventional digital multiplex transmission device
The data detector 4 detected the presence or absence of data based on whether there was a certain bit pattern between one frame, such as all bits "1" or all bits "0". Terminals that send out a pattern different from the judgment bit pattern as invalid data despite trying to improve transmission efficiency by using silent periods or periods with no data (for example, synchronous terminals and asynchronous terminals) (in which the polarity of all marks on the transmission path is opposite), it cannot be determined that there is no data, so the transmission efficiency on the transmission path has decreased.

The present invention has been made in view of the above points, and an object of the present invention is to provide a digital multiplexing transmission device that can efficiently utilize a transmission path regardless of the type of terminal or the like.

(Means for Solving the Problems) Fig. 1 shows a principle block diagram of the present invention.In the figure, 11 indicates a multiplexing block, 12 indicates a line as a transmission path, and 13 indicates a separation block.The present invention basically consists of a multiplex block 11.

14 is a selector that selectively outputs either audio data or packet data. 15 is an audio detection circuit that detects the presence or absence of audio data, and uses the detection signal to set the selector 14 to 1Ill.
I'll do it. A selector 16 selectively outputs either packet data or non-packetized data. A fixed pattern detector 17 detects the presence or absence of data that is not packetized, and controls the selector 16 using the detection signal. 1
8 is a multiplexing unit, which includes selectors 14, 16 . Voice detection circuit 1
5 and the fixed pattern detector 17 are multiplexed and sent to the line 15.

19 is a demultiplexing section that demultiplexes the input digital multiplexed signal. 20 is a selector which sorts and outputs input digital data for each data item. A selector 21 selectively outputs either the audio data or the noise from the noise generation circuit 22.

23 is a fixed pattern generator which outputs unpacketized data delayed by a certain frame when the received digital data has a predetermined fixed pattern, and outputs unpacketized data delayed by a certain frame when the received digital data does not have a predetermined fixed pattern; Output as is.

A selector 24 selectively outputs either the packet data from the selector 20 or the non-packetized data from the fixed pattern generator 23.

The present invention provides a first method for selectively outputting packet data during a silent period.
a second selection means 14 and 15 for selectively outputting non-packetized data when non-packetized data exists, and selectively outputting packet data when non-packetized data exists;
The digital multiplexing transmission apparatus comprising the selecting means 16 and the multiplexing section 18 is characterized in that it is equipped with a fixed pattern detector 17 having a configuration as shown in FIG.

In FIG. 2, the fixed pattern detector 17 includes a delay circuit 26 having a fixed frame delay time, a determination circuit 27 that determines whether input data and output data of the delay circuit 26 have the same value, and data that is not packetized. It consists of a detection circuit 28 that outputs a detection signal indicating the absence of.

The fixed pattern generator 23 on the receiving side is comprised of a delay circuit 29 made up of a memory, as shown in FIG.

[Effect]

Data that is not packetized is sent to the delay circuit 26 shown in FIG.
, where a certain frame (for example, 1 frame)
After being delayed, the signal is supplied to the determination circuit 27, while it is directly input to the determination circuit 27.

The determination circuit 27 is composed of, for example, an exclusive OR circuit, and determines whether the bits of the delayed data a from the delay circuit 26 and the input non-delayed data b have the same value.

Therefore, as shown in FIG. 3, the input data of the delay circuit 26 is F1→F2→F3−→F4→Fs→・
..., frames F2. F3 and F
4 have the same pattern, the determination circuit 27 continues to output a determination signal of a predetermined value "0" bit by bit during each frame period in which frames F3 and F4 are sequentially input (however, (When the delay time of the delay circuit 26 is one frame).

The detection port path 28 receives the value “0” of the output judgment signal of the judgment circuit 27.
When this continues for one frame, a detection signal with a value of "0" indicating no data is output. This detection signal is input to the multiplexing unit 18 shown in FIG. (or packet data) and after being time-division multiplexed with the packet data,
The signal is input to the separation unit 19 via the line 12.

Note that if the determination signal of 90'' does not continue for one frame, it is determined that there is data input at the current time, and the detection circuit 2
8 outputs a detection signal of value "1". At this time,
Data that is not packetized is transmitted and outputted from the multiplexing unit 18 together with a detection signal, audio data (or packet data), and the like.

The fixed pattern generator 23 in the separation block 13 is a second
As shown in the figure, it consists of a delay circuit 29 using memory, and when the value of the detection signal is "1", the delay circuit 29
writes the input data for that one frame period, and when the value of the detection signal becomes "0", the input operation is stopped and the unpacketized data held one frame before is written to the selector 24. Output to.

The selector 24 is configured to be controlled by a detection signal from the separation unit 19, and when the value of the detection signal is "0", it outputs delayed unpacketized data from the delay circuit 29, and outputs "1". ”, the current non-packetized data from the selector 20 is selected and output.

In this way, in the present invention, since the presence or absence of non-packetized data is transmitted using a 1-bit detection signal determined by whether the pattern is the same as that of data a certain frame before, the non-packetized data can be transmitted regardless of the type of terminal, etc. It is possible to accurately determine and detect the presence or absence of

〔Example〕

FIG. 4 shows a configuration diagram of an embodiment of the present invention. In the figure, the same components as those in FIG. In FIG. 4, 30 is a telephone, 31 is a telephone exchange, 32 is a terminal, 33 is a packet switch, and 34 is a telephone exchange.
is a terminal that outputs data that is not packetized.

Reference numeral 35 denotes a high-efficiency multiplexing device, which includes the multiplexing block 11 shown in FIG.

Fixed pattern detectors 17 in multiplexing block 11 are provided in one-to-one correspondence to the number of terminals 34. CPU
36Lt transmission line (7) ffi vision-IIJtll information (R
AS) at a transmission rate of 2.4 bps.
Send to 1.

The exchange 1131 also converts the reputation signal from the telephone 1130 into a digital signal of 966 bps voice data, and sends it to the multiplexing block 11 via the interface 37.
supply to Packet switch 33 assembles data from terminal 32 into packets and supplies them as packet data to multiplexing block 11 via interface 38. Furthermore, terminal 34 supplies unpacketized data to multiplexing block 11 .

The multiplexing block 11 generates a digital multiplexed signal with a frame format as shown in FIG. supply

In Fig. 5, the first bit is a frame synchronization bit for synchronizing this frame format, and the second bit is a bit indicating that the predetermined number of bits of data following the fifth bit, Jig Pulling SIG, is audio data or a packet. Data (PK
T) Speech/silence identification bit, the third bit is 2
The next predetermined number of bits of the second signaling SIG■ is a voice/silence identification bit that indicates whether the data is voice data or packet data (PKT), the fourth bit is a bit that indicates the presence or absence of data that is not packetized, and the fifth bit is a bit that indicates the presence or absence of data that is not packetized. The th bit is a bit indicating the presence or absence of RAS.

Further, R8 is a transmission request signal, in which unpacketized data or packet data (PKT) is multiplexed into a predetermined number of bits starting from the next bit.

Note that the monitoring information (RAS) is multiplexed and transmitted in a predetermined bit area starting from the 6th bit, regardless of the audio data. RAS is not transmitted all the time, but only when needed. Packet data consists of, for example, a header and data, and one packet may be divided into multiple transmissions and transmitted.

This embodiment is characterized by the fourth bit in FIG. 5, which indicates the presence or absence of data, and the value of this bit is the value of the output detection signal of the fixed pattern detector 17. Therefore, when the value of this bit is "1", unpacketized data is transmitted, and when it is "O", packet data is transmitted.

The digital signal having the frame format shown in FIG. 5 is separated into audio data, packet data, non-packetized data, and RAS by the separation block 13 shown in FIG. 4, as described above. RAS, gtrue data and packet data are respectively CPυ41. The signals are input to interfaces 42 and 43, respectively.

The voice data taken out from the interface 42 is converted into an analog voice signal by the exchange 44, and connected to the desired telephone IeI 45 of the other party. Note that the silent period includes the traces of conversation during the call, and in this case, the noise generated by the noise generation circuit 22 shown in FIG. Reduces the discomfort caused by

Further, the packet data taken out from the interface 43 is input to the packet exchange 1146, where the packets are disassembled and assembled into a message, and then sent to a predetermined destination terminal 47.

Further, the unpacketized data extracted from the separation block 13 is sent to the terminal 48.

As mentioned above, packet data is transmitted during a period in which non-packetized data is not transmitted, but during this period, non-packetized data at least one frame before the separation block 13 is retrieved, but is not packetized. The current packet data to be transmitted instead of data is sent from the separation block 13 to the interface 43.
It will be output to the packet switch 46 via.

According to this embodiment, when the value of the fourth bit of the frame format shown in FIG. 5 is "0", the transmitted data is treated as packet data, and the actual data includes at least the bits of the previous frame. The pattern is output.

C Effects of the Invention] As described above, according to the present invention, it is possible to accurately determine and detect the presence or absence of non-packetized data regardless of the type of terminal, etc. Therefore, when there is no non-packetized data, packet data is transmitted. In addition, even in the case of terminals transmitting the same frame data even during periods when they are not communicating, it is possible to accurately detect between WJs that are not communicating and still transmit data that is not packetized. It has features such as being able to use lines efficiently.

[Brief explanation of drawings]

Figure 1 is a diagram of the principle configuration of Kinoe and Akira, Figure 2 is a diagram of the principle configuration of the main parts of the present invention, Figure 3 is an explanatory diagram of data presence/absence determination, and Figure 4 is a diagram of the configuration of an embodiment of the present invention. , FIG. 5 is a diagram showing an example of a frame format, and FIG. 6 is a block diagram of an example of a conventional main part. 19 is a demultiplexer, 23 is a fixed pattern generator, 31.44 is a switch, 33.46 is a packet switch, and 35.40 is a high efficiency multiplexer. Patent applicant: Fujitsu Ltd., 11 is a multiplexing block, 13 is a separation block, 14, 16, 20, 21, 24 is a selector, 15 is a voice detection circuit, 17 is a fixed pattern detector, 18 is a multiplexing section,

Claims (1)

[Scope of Claims] A first selection means (14,
15) and second selection means for selectively outputting unpacketized data from the terminal and data that is normally not packetized from the packet data, and selectively outputting the packet data during a period when the unpacketized data does not exist. (16) and the first and second selection means (14-16)
A digital multiplexing transmission device comprising a multiplexing unit (18) that multiplexes each output data and sends it to a transmission path, the delay circuit (26) delaying the non-packetized data by a certain frame; a determination circuit (27) for determining whether the input data and output data of 26) have the same value; and a determination circuit (27) for determining whether the input data and the output data of the determination circuit (27) continuously obtain determination outputs of the same value for the certain frame, the packetization is not performed. A detection circuit (28) that outputs a detection signal indicating that data does not exist as a control signal for the second selection means (16) and also outputs it to the multiplexing section (18). Digital multiplex transmission equipment.