JPH11196182A - Private branch exchange and multiplexer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a private branch exchange and a multiplexer for compressing a sound signal and executing communication through a common line signal, which can execute communication through the use of compression function of another device if the other device has the same compression function even if a compression system differs end-to-end. SOLUTION: A switching part 130 for connecting signals inputted from a terminal and a line to a prescribed outgoing line; a compression information processing part 110 for processing information on the compression system of the input signal and storing sound compression information in a common line signal; a compression decoding processing part 120 for referring the input signal to the compression system stored in the compression information processing part 110, for compressing/outputting the input sound signal from the terminal when the input signal is the signal of a compression/decoding object and for decoding/outputting the input sound signal from the line; and a multiplexer 140 for multiplexing uncompressed signals from the switching part 130, compressed signals form the compression/decoding processing part and common line signals from the compressed information processing part 110 so as to execute transmission/reception are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private branch exchange which performs communication by compressing a voice signal using a common channel signal, and a multiplexing apparatus.

[0002] With the progress of the information society, the amount of voice communication and data communication between each base has been steadily increasing, and effective use of a line connecting the bases has been strongly demanded. .

[0003] From such a demand, as a basic unit, an audio signal encoded at 8 bits x 8 kbps = 64 kbps is encoded at 32 kbps by a 32k-ADPCM (Ada).
ptive Differential Pulse Code Modulation, 16k-LD-CELP (Low Del
ay-Code Excited Linear Prediction, low-delay code-excited linear prediction), 16k-APC-AB (Adaptive Predic
tive Coding With Adaptive Bit allocation, 8k-LD-CELP, 8k-A
Compression methods such as PC-AB have been adopted.

As described above, although a plurality of coding systems are used, even when a plurality of coding systems are employed in a network, a private branch exchange and a multiplexing device capable of performing efficient communication are provided. Has been requested.

[0005]

2. Description of the Related Art FIG. 13 is a view for explaining a conventional example (part 1).
Is shown. In the figure, reference numeral 100 denotes a private branch exchange that performs voice compression communication, 112 denotes a processing unit that controls the compression / decoding process of voice signals, 113 denotes a storage unit that stores data designating a compression / decoding method for each terminal, and 120 denotes a terminal. A compression / decoding processing unit for compressing and decoding the audio signal input from T, a switch unit 130 for switching the audio signal, a multiplexing unit 140 for multiplexing the audio signal and the common channel signal, and a reference numeral 150 for the private branch exchange 100 and the terminal T 160 is an interface unit for interfacing with the private branch exchange 100 and the multiplexer 20.
0 (not shown).

In the configuration shown in the figure, whether or not communication is performed by compressing voice for each terminal T is input from the maintenance console 300 and registered in the storage unit 113. When there is a call from the terminal T, the processing unit 112 refers to the storage unit 113 to determine whether or not to perform compression, and in the case of the terminal T to perform compression, controls the switch unit 130 to perform the compression. Then, the audio signal is connected to the compression / decoding processing unit 120, compressed, and transmitted to the multiplexing unit 140.

On the other hand, the processing unit 112 converts the call signal (the destination number) from the terminal T into a common line signal, and
Send to The multiplexing unit 140 multiplexes the uncompressed audio signal, the compressed audio signal, and the common channel signal, and
0 to the multiplexer 200.

As the common line signal, a D channel common line signal system and a NO7 common line signal are used. Both of them are based on a communication speed of 64 kbps, but the data amount actually used is 9. 6 kbps or less.

FIG. 14 is a diagram (part 2) for explaining a conventional example. In the figure, reference numeral 200 denotes a multiplexing apparatus for performing voice compression communication, 212 denotes a processing unit for controlling a compression / decoding process of a voice signal, 213 denotes a storage unit for storing data designating a compression / decoding method for each line, and 220 denotes a local area A compression / decoding processing unit for compressing and decoding voice signals input from the exchange and the line; 230, a demultiplexing unit for demultiplexing the input signal;
Reference numeral 240 denotes an interface unit for interfacing the private branch exchange 100 with the multiplexing apparatus 200, and reference numeral 250 denotes a transmission / reception unit for transmitting / receiving data to / from a line.

In the configuration shown in the figure, transmission and reception of voice signals between the private branch exchange 100 and the multiplexing apparatus 200 are performed through a 2MDNI interface, and call signals are transmitted and received as common line signals. Here, the maintenance console 30 determines whether or not to perform communication by compressing voice for each channel of 2MDNI.
Input from 0 and register in the storage unit 213. Processing unit 2
Reference numeral 12 controls the demultiplexing unit 230 based on the information registered in the storage unit 213 to connect a channel for performing audio compression to the compression / decoding processing unit 220. The compressed audio signal is input again to the demultiplexer 230, multiplexed with another signal, and transmitted to the line.

Since the common channel signal is a signal that cannot be compressed, the multiplexer 200 transmits the signal to the line without performing any processing. FIG. 13 illustrates the private branch exchange 100 having the compression / decoding function of the audio signal, and FIG. 14 illustrates the multiplexing apparatus 200 having the compression / decoding function. However, which apparatus compresses the audio signal is determined at the time of network design. , Use either.

[0012]

As described above, a plurality of compressions are used in the audio compression system, and different networks may employ different audio compression systems in separately constructed networks. As described above, when communication is performed between networks using different compression schemes, one's own compressed audio signal is once decoded to a basic 64 kbps audio signal and then compressed again using the compression method of the other party. , The compression and decoding are performed twice, which degrades the voice quality. Further, in order to connect such audio signals of different compression systems, it is determined which of the private branch exchange and the multiplexer performs compression decoding, and the setting of the compression decoding process is performed from the maintenance console connected to each of them. It is necessary to perform

According to the present invention, even if the compression method is different from end to end, if another device has the same compression function, efficient communication can be performed using the compression function of the other device. A private branch exchange and a multiplexing device that can be realized.

[0014]

FIG. 1 is a diagram for explaining a first principle of the present invention. In the figure, reference numeral 100 denotes a private branch exchange that performs voice compression communication.

In the figure, reference numeral 110 denotes a compression information processing unit for processing information relating to the compression method of the input signal and accommodating the audio compression information in a common channel signal. When the input signal is a signal to be compressed and decoded, the input audio signal from the terminal T is compressed and output, and the input audio signal from the line is decoded and output by referring to the stored information regarding the compression method. A decoding processing unit 130 is a switch unit that connects a signal input from the terminal T and a line to a predetermined output line.

A multiplexing unit 140 multiplexes an uncompressed signal from the switch unit 130, a compressed signal from the compression / decoding processing unit 120, and a common line signal from the compressed information processing unit 110 to perform transmission and reception.

In this configuration, whether or not compression is possible for each terminal T and the compression method are registered in the compression information processing unit 110 of the private branch exchange 100. Here, when there is a call from the terminal T, the compression information processing unit 110 refers to the terminal number of the terminal T and the stored compression enable / disable information for each terminal, and The audio signal is supplied to the switch unit 130
To perform compression by connecting to the compression / decoding processing unit 120. The compressed audio signal is sent to multiplexing section 140.

On the other hand, the compression information processing unit 110 writes the terminal number of the terminal T, the destination number, and the compression method compressed by the compression / decoding processing unit 120 into the common channel signal, and
Send to 40. The multiplexing unit 140 multiplexes the uncompressed audio signal, the compressed audio signal, and the common channel signal, and sends the multiplexed signal to a multiplexer (not shown).

As described above, whether or not compression is possible is registered in the compression information processing unit 110 for each terminal T, and the compression information processing unit 110 is referred to when a call from the terminal T is made. The compression is performed by the processing unit 120, and the compression method is transmitted on a common channel signal. Private branch exchange 10 on the receiving side
At 0, the common line signal is referred to by the compression information processing unit 110,
In the case of a compressed signal, the compression method is determined, and decoding processing of the compression method is executed.

According to such processing, compression and decoding can be easily performed, and efficient exchange of audio signals can be achieved.
FIG. 2 is a view for explaining the second principle of the present invention. Reference numeral 200 in the figure denotes a multiplexing device that performs voice compression communication.

In the figure, reference numeral 210 denotes a private branch exchange 100 and a compression information processing section for processing information relating to the compression method of the audio signal input from the line and accommodating the audio compression information in a common channel signal. The input signal is referred to as information relating to the compression method stored in the compression information processing unit 210. If the input signal is a signal to be subjected to compression decoding, the input audio signal from the private branch exchange 100 is compressed and output, and is output from the line. A compression / decoding processing unit that decodes and outputs the input voice signal, and 230 denotes a demultiplexing unit that demultiplexes the voice signal and common line signal input from the private branch exchange 100 and the line.

With this configuration, whether or not compression is possible is registered in the compression information processing unit 210 for each line, and the compression information processing unit 210 is referred to when a signal is received. The compression is performed by the section 220, and the compression method is transmitted on a common channel signal.

In the multiplexing apparatus 200 on the receiving side, the common channel signal is referred to by the compression information processing section 210.
The compression method is determined, and decoding processing of the compressed signal is executed.
By such processing, compression and decoding can be easily performed, and efficient exchange of audio signals becomes possible.

[Detailed Description of the Invention] FIG. 3 shows an embodiment (1) of the present invention.
FIG. The figure shows an embodiment of the private branch exchange 100 corresponding to the first principle diagram. In the figure, the same components as those in the principle diagram are denoted by the same numerals.

FIG. 3 shows that the compression information processing section 110 is composed of an audio compression information generation / analysis section 111, a processing section 112, and a storage 113.
This is an example configured from. In the figure, the maintenance console 3
The terminal T that performs compression and its compression method are input from 00 and registered in the storage unit 113. Here, when the terminal T makes a call, the outgoing signal is taken into the private branch exchange 100 via the interface unit 150. The processing unit 112
The voice compression information generation / analysis unit 111 is instructed to analyze the transmission signal. Upon receiving the instruction, the voice compression information generation / analysis unit 111 refers to the terminal number of the transmitting terminal T as the compression information in the storage unit 113 to determine whether or not to perform compression. The audio signal from the terminal T is transmitted to the switch unit 1
It connects to the compression / decoding processing unit 120 via 30, compresses it by a specified compression method, and sends out the compressed audio signal to the multiplexing unit 140. Further, the type of the used compression method is written in the common line signal and transmitted to the multiplexing unit 140. The multiplexing unit 140 multiplexes with a compressed and uncompressed audio signal from another terminal T and an uncompressed common channel signal, and transmits the multiplexed signal to the multiplexing apparatus 200 via the transmitting and receiving unit 160.

FIG. 4 is a diagram for explaining the audio compression information generation / analysis section of the present invention. The figure shows the configuration of the voice compression information generation / analysis unit 111 accommodated in the private branch exchange 100. Receiver A
Receives the calling signal from the processing unit 112 of the private branch exchange 100, the signal reading unit B reads the voice compression information on the common line signal, and the signal analysis unit C stores the voice compression information from the line and the storage unit 113. The control unit D refers to the compression information
Then, a compression instruction is issued to the processing unit 112 from the reference result, and the signal generation unit E generates a common channel signal, and the transmission unit F
To the multiplexing unit 140 via

FIG. 5 shows the data format of the common line signal of the present invention. As described above, the common line signal is 64 k
Although one time slot of bps is used, the actual band used is about 9.6 kbps, so there is a sufficient margin and the following signals can be accommodated.

(A) Shows a transmission signal. D1; type of signal. 00; transmission signal, 11; return signal return D2: extension number of terminal T that transmitted.

D3: Called party number. D4: Whether compression is possible. 1; OK, 0; No D5; Compressor, 00; Invalid, 01; TDM, 10; P
BX D6; Compression method, 000; Invalid, 001; 64k-PCM, 0
10; 32k-ADPCM 011; 16k-LD-CELP, 100; 16k-APC-AB 101; 8k-LD-CELP, 111; 8k-APC-AB D7; channel number;
Channel number of interface (B) Indicates a return signal.

D8: Signal type. 00: reply signal D9; same as D2 in (A) D10: communication availability. 0: Communication enabled, 1; Communication disabled D11: Reason for failure; 00; Invalid, 01: Busy, 10: Different compression method D12: Same as D6 in (A) D13; Same as D7 in (A) Such data is common Efficient communication becomes possible by writing in the line signal and allowing the private branch exchange 100 and the multiplexer 200 to mutually recognize the compression method.

FIGS. 6 to 8 show flowcharts (Nos. 1 to 3) of the embodiment (1) of the present invention. The detailed operation of the present invention will be described with reference to a flowchart. S1: The receiving unit A of FIG. 4 receives a signal.

S2: It is determined whether the received signal is a signal from the processing unit 112 or a reception from a line. S3: In the case of reception from the processing unit 112, since the transmission process is performed, the number of the terminal T is referred to as information in the storage unit 113.

S4: It is determined whether or not the terminal performs compression. S5: Reference is further made to the information in the storage unit 113. S6: The apparatus that performs voice compression is a private branch exchange (PBX in the figure).
Is determined to be 100).

S7: When compression is performed by the private branch exchange 100, the signal generation unit E sets the compression enable / disable information D4 to "OK", sets the compression device information D5 to "PBX", and uses the installed compression method code as the voice of the common line signal. Write to the compression information data D6.

S8: A free channel of 2MDNI accommodating the audio signal is confirmed. S9: The control unit D sends a common channel signal to the line accommodating the other party from the other party's dial number D3.

S10: If it is determined that the terminal T originating in S3 does not compress, voice compression is performed with the compression availability information D4 as "No", the compression device information D5 as "Invalid", and the compression method D6 as "Invalid". Generate information data.

S11: If it is determined in S6 that compression is not to be performed by the private branch exchange 100, the signal generator E sets the compression device information D5 to "TDM", the compression availability information D4 to "OK", and the installed compression system. The code is written into the audio compression information data D6 of the common line signal.

S12: The vacant channel number confirmed in S8 is written into the audio compression information data D7 of the common line signal. S13: When the signal received in S2 is received from the line,
It is determined from the dial number whether the call is dropped by the own station.

S14: It is determined whether the signal is a transmission signal or a return signal. S15: If the received signal is a transmission signal, it is determined whether or not the audio compression information data can be compressed.

S16: The compression device determines whether it is "PBX". S17: The compression method of the audio compression information data is determined. S18: It is determined whether the partner terminal is empty.

S19: If the partner terminal is vacant, communication is possible, so that communication permission / prohibition D10 of the reply data is set to “permitted”. S20: The processing unit 113 instructs to connect the 2MDNI audio channel to the compression / decoding processing unit 120.

S21: If the received signal is not the own station, it is a relay, so a common line signal is sent out to the line. S22: If it is determined that the signal received in S14 is a return signal, it is determined whether communication is possible.

S23: If the communication is not possible, the reason for the failure is confirmed. S24: The compression method is checked in S17, and if the methods do not match, the return data is set to "compression method mismatch".

S25: If the destination terminal is not empty in S18, the reply data is set to "busy". S26: The communication propriety of the reply data is set to "No".

S27: Reply data is sent back to the line side. S28: If communication is possible in S22, a signal from the terminal is connected to the compression / decoding processing unit 120.

S29: If the reason for the non-communication is busy in S23, a busy tone is transmitted to the terminal T. According to this flow, in the case of transmission, while compressing the audio signal, the compression method in which the compression is performed on the common channel signal is written and transmitted, and in the case of reception, the decoding process for the compression system specified by the common channel signal is performed. Execute.

FIG. 9 is a view for explaining an embodiment (2) of the present invention. The figure shows a multiplexer 20 corresponding to the second principle diagram.
0 is an embodiment. The figure shows an example in which the compression information processing unit 210 is composed of a voice compression information generation / analysis unit 211, a processing unit 212, and a storage 213.

In the figure, the compression method equipped in the multiplexing device 200 is input from the maintenance console 300 and registered in the storage unit 213. Here, when the audio compression information generation / analysis unit 211 receives the signal, the processing unit 212 determines whether or not to perform compression by referring to the common line signal, and in the case of a signal to be compressed, multiplexes the signal. The signal is connected to the compression / decoding processing unit 220 via the demultiplexing unit 230, compressed by a specified compression method, and transmitted to the demultiplexing unit 230. Further, the type of the used compression method is written in the common line signal and transmitted to the demultiplexing unit 230. Demultiplexing unit 230
Then, the signal is multiplexed with an audio signal from another line and an uncompressed common line signal and transmitted to the line side via the transmission / reception unit 250.

The configuration of the audio compression information generation / analysis section 211 accommodated in the multiplexing apparatus 200 is the same as that shown in FIG. 4, and the connection destinations are respectively the multiplexing / demultiplexing section 230, the processing section 212, the storage section 213 in the multiplexing apparatus 200 Become.

FIGS. 10 to 11 show an embodiment (2) of the present invention.
Are shown (No. 1, No. 2). S1: The receiving unit A of the multiplexer 200 in FIG. 4 receives a signal.

S2: It is determined whether or not the received signal is a transmission signal. S3: In the case of an outgoing signal, it is determined whether or not the own station is dropped from the destination number. S4: If the terminal drops, it is determined whether or not the terminal performs compression.

S5: Compression device is multiplex device 200
It is determined whether or not. S6: It is determined whether or not a specified compression method is provided. S7: The corresponding audio channel of 2MDNI is connected to the compression / decoding processing unit 220.

S8: If it is determined in S3 that the own station has not been dropped, a common line signal is transmitted to the line. S9: If it is determined in S4 that the compression process is not possible or the compression device is determined to be the private branch exchange 100, the compression is not performed and the private branch exchange 100 is connected.

S10: If it is determined in S6 that there is no specified compression method, the compression device is rewritten to "PBX". S11: Send the rewritten common line signal to “PBX”.

S12: If the signal received in S2 is a reply signal, it is determined from the dial number whether or not the call is dropped by its own station. S13: In the case of the signal of the own station drop, it is determined whether or not the signal is a return signal.

S14: In the case of a return signal, it is determined whether communication is possible. S15: In the case of communication failure, it is determined whether the reason is method mismatch. S16: It is determined whether or not a communication non-compression method is provided.

S17: If equipped, rewrite the compression method to "TDM". S18: Connect the 2MDNI audio channel to the compression / decoding processing unit 220. S19: If the local station is not dropped in S12, it is a relay, so a common line signal is transmitted to the line.

S20: If it is determined in S13 that the received signal is not a return signal (in the case of return), or if it is determined in S14 that communication is possible, a common line signal is sent to the PBX. S21: If the reason for communication failure is not system mismatch, or if a compression method for communication failure is not provided, the communication availability of the return data is left as "No".

S22: After rewriting the compression method to "TDM" in S17, the signal type is rewritten to "return". According to this flow, when the private branch exchange 100 performs compression and performs communication with the other private branch exchange 100, the multiplexer 200 has the same compression scheme even if the private branch exchange 100 does not have a scheme that matches the compression scheme. In such a case, it is possible to set so that the compression / decoding is automatically performed on the multiplexing apparatus 200 side, thereby enabling communication.

FIG. 12 is a diagram illustrating a network according to the present invention. Reference numerals 101 to 104 denote private branch exchanges.
Multiplexers 01 to 204 are connected to the private branch exchanges 101 to 14. For example, if audio compression of the A system is performed between the multiplexing devices 201 and 202, and audio compression of the B system is performed between the multiplexing devices 203 and 204, the terminal T1 and the private branch exchange 104 accommodated in the private branch exchange 101 accommodate the private exchanges. Terminal T4 performs communication, the private branch exchanges 101, 104,
Each of the multiplexing devices 201 to 204 confirms the compression method provided, and the device provided with the communicable compression method performs compression by performing communication.

[0061]

According to the present invention, even if the audio compression method differs between end and end, if the devices constituting the network have the same compression method, the compression method is automatically selected. Communication can be performed by performing compression / decoding processing.

Further, the number of times of compression / decoding of the audio signal can be reduced by the connection processing, and the quality of the audio signal can be prevented from deteriorating. Further, when communication is performed between terminals using different compression methods, it is necessary to register the compression method for each line from the maintenance console to a device configuring the network. Eliminates the need.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first principle of the present invention.

FIG. 2 is a diagram illustrating a second principle of the present invention.

FIG. 3 illustrates an embodiment (1) of the present invention.

FIG. 4 is a view for explaining a voice compression information generation / analysis unit of the present invention;

FIG. 5 is a data format of a common line signal according to the present invention.

FIG. 6 is a flowchart (part 1) of the embodiment (1) of the present invention.

FIG. 7 is a flowchart (part 2) of the embodiment (1) of the present invention.

FIG. 8 is a flowchart (part 3) of the embodiment (1) of the present invention.

FIG. 9 illustrates an embodiment (2) of the present invention.

FIG. 10 is a flowchart (part 1) of the embodiment (2) of the present invention.

FIG. 11 is a flowchart (part 2) of the embodiment (2) of the present invention.

FIG. 12 illustrates a network according to the present invention.

FIG. 13 illustrates a conventional example (part 1).

FIG. 14 illustrates a conventional example (part 2).

[Explanation of symbols]

 100, 101 to 104 Private branch exchange 110, 210 Compression information processing unit 111, 211 Voice compression information generation and analysis unit 112, 212 Processing unit 113, 213 Storage unit 120, 220 Compression and decoding processing unit 130 Switch unit 140 Multiplexing unit 150, 240 Interface Units 160, 250 Transmission / reception units 200, 201 to 204 Multiplexer 230 Demultiplexer 300 Maintenance console A Receiver B Signal reader C Signal analyzer D Controller E Signal generator F Transmitter T, T1 to T4 Terminal

Claims (2)

[Claims] 1. A private branch exchange for performing voice compression communication, comprising: a switch unit for connecting a signal input from a terminal and a line to a predetermined outgoing line; A compression information processing unit for accommodating audio compression information in a common line signal, and referring to the input signal as information on a compression method stored in the compression information processing unit, and when the input signal is a signal to be compressed and decoded, A compression decoding unit for compressing and outputting an input audio signal from a terminal, decoding and outputting an input audio signal from a line, an uncompressed signal from the switch unit, a compressed signal from the compression and decoding unit, A private branch exchange comprising a multiplexing unit for multiplexing and transmitting / receiving a common channel signal from the compression information processing unit. 2. A multiplexer for performing voice compression communication, comprising: a private branch exchange, a demultiplexer for demultiplexing a voice signal and a common line signal input from a line, and a voice input from the private branch exchange and a line. Performs processing of information related to a signal compression method, and refers to a compression information processing unit that accommodates the audio compression information in a common channel signal, and refers to the input signal as information related to a compression method stored in the compression information processing unit. In the case where the input signal is a signal to be subjected to compression / decoding, a compression / decoding processing unit is provided for compressing and outputting an input voice signal from the private branch exchange, and decoding and outputting an input voice signal from the line. Multiplexing equipment.