JPH0514528A - Signal relay transmission system - Google Patents

Abstract

PURPOSE:To discriminate a signal representing a loss of its own station by an exchange and to prevent the deterioration in the operating efficiency of a relay line by providing a voice coding function and a bit addition/deletion function to the same module. CONSTITUTION:When a discrimination information detection means 9 detects discrimination information as to a signal from an exchange 1, a control means 10 switches selectors 4, 8 to the position of a bit addition section 3 and a bit deletion section 7 respectively. Thus, a compression signal from a relay line is added with bit information and discrimination information is added by a discrimination information addition means 5 via the selector 4 and bit information is deleted after the relay exchange and the result is sent to other relay line via the selector 8. On the other hand, when the means 9 does not detect discrimination information, the control means 10 switches the selectors 4, 8 to the position of a decoder section 2 and a coder section 6 respectively. Thus, the signal from a terminal equipment accommodated in the exchange 1 is coded and sent to a transmission line via the selector 8 and a compression signal from an opposite station is sent to the terminal equipment as a signal representing a loss of its own station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal relay transmission system for transmitting, for example, 64 Kbps digital voice at a low speed such as 32 Kbps or 16 Kbps for transmission.

Generally, in the case of transmitting a voice signal while performing relay exchange, a voice coder (a voice coder here is a codec having a coding unit and a decoding unit. When it is passed through a repeater exchange (the processing unit in this repeater exchange is 64 Kbps), voice quality will deteriorate if another link is connected. In this case, the audio coded by the audio encoder is not returned to 64 Kbps but is added to the bit so that the audio compressed at low speed is apparently set to 64 Kbps.

[0003]

2. Description of the Related Art FIG. 6 is a block diagram showing a conventional example. In FIG. 6, 101 is a transit exchange (TS),
102 is a private branch exchange (L
S) and 103 are time division multiplexers. This time division multiplexer 103 is a switch interface (PBX).
IF; hereinafter referred to as PBX interface) 104, network port (NP) 105, bit adder / deleter 106, and voice encoder 107.

Here, the PBX interface 104 is
The interface processing required is performed when signals are exchanged between the time division multiplexer 103 and the repeater exchange 101 and private branch exchange 102.

The network port 105 is an input / output port to the trunk line of the time division multiplexer 103. The bit adder / deleter 106 adds a bit to a signal to the repeater exchange 101 or deletes a bit from a signal from the repeater exchange 101. By adding the bit in this way, compression is performed at a low speed. Apparently 64K
The signal is compressed at a low speed by setting bps and deleting bits on the contrary.

The voice encoder 107 is a private branch exchange 102.
The signal from the private branch exchange 102 is subjected to the decoding process and the signal from the private branch exchange 102 is subjected to the encoding process. The bit adder / deleter 106
And the speech coder 107 are placed separately.

With such a configuration, as shown in FIG. 6, first, the compressed signal from the relay line (see FIGS. 6 and 7).
Is sent to the bit adder / deleter 106 via the 1ch network port 105 of the time division multiplexer 103. The compressed signal sent to the bit adder / deleter 106 is added with bits to obtain 64KPCM. Is output as a signal (see FIGS. 6 and 7) which is apparently the same as the signal (see FIGS. 6 and 7) and is sent to the transit exchange 101 via the PBX interface 104.

The apparent 64KPCM signal sent to the repeater exchange 101 is discriminated as to whether it is for relay or for a local station, and in the case of relay, the bit addition / deletion unit 10 is used.
6 to the voice encoder 107 in the case of own station drop, respectively, via the PBX interface 104.

Further, the signal sent to the bit adder / deleter 106 has the previously added bits deleted,
The original compressed signal (see FIGS. 6 and 7) is converted and sent to the transmission line through the network port 105 of another channel (for example, 2ch) (see the dotted line path in FIG. 6).

The signal sent to the voice coder 107 is highly efficient compressed and also passes through the private branch exchange 102 via the same PBX interface 104 and then the extension terminal 102.
a) (see the solid line route in FIG. 6).

[0011]

However, in such a conventional voice signal relay / transmission means, hardware for adding / deleting bits is required in addition to the voice encoder, and the transmitted signal is On the other hand, since it is necessary to change the number of bits to be added / deleted according to the bit rate of the voice encoder both when going to the trunk line and when going to the own station, the management becomes complicated. Further, in the case where the own station is dropped, since it comes to the own station from the relay line via the voice encoder once, there is a problem that the efficiency of use of the relay line is reduced.

The present invention was devised in view of the above problems, and by providing a voice coding function and a bit addition / deletion function in the same module, the time and effort required to change the number of bits of a local station drop signal are eliminated. An object of the present invention is to provide a signal relay transmission system that can identify a signal by a switchboard even if it is omitted, and that can also prevent a decrease in the usage efficiency of a relay line.

[0013]

FIG. 1 is a block diagram of the principle of the present invention. In FIG. 1, reference numeral 1 is an exchange. On the input side of the exchange 1, a decoding section 2, a bit adding section 3,
A selector 4 and discrimination information adding means 5 are provided.

Here, the decoding unit 2 decodes the compressed signal from the relay line, and the bit addition unit 3 is provided in the same module as the decoding unit 2 and the compressed signal from the relay line is provided. The bit information is added so that the exchange 1 can process it.

The selector 4 selects either the decoding unit 2 or the bit addition unit 3, and the discrimination information addition unit 5 adds discrimination information to the output signal from the selector 4. .. Further, on the outgoing line side of the exchange 1, an encoding unit 6, a bit deleting unit 7, a selector 8 and a discrimination information detecting means 9 are provided.

Here, the encoding unit 6 compresses and encodes the signal from the exchange 1, and the bit deleting unit 7
Is provided in the same module as the encoding unit 6 and deletes bit information from the signal from the exchange 1 in order to restore the signal from the exchange 1 to a compressed signal.

The selector 8 selects either the encoding unit 6 or the bit deleting unit 7, and the discrimination information detecting means 9
Is for detecting the presence / absence of discrimination information regarding the signal from the exchange 1.

By the way, 10 is a selector switching control means, and when the discrimination information detecting means 9 detects the discrimination information about the signal from the exchange 1, the selector switching control means 10 adds bits to the selectors 4 and 8 respectively. When the discriminant information is not detected in the signal from the exchange 1, the selectors 4 and 8 are switched to the decoding unit 2 and the encoding unit 6 side.

[0019]

In the signal relay transmission system of the present invention described above, when the discrimination information detecting means 9 detects the discrimination information about the signal from the exchange 1, the selector switching control means 10
The selectors 4 and 8 are switched to the bit addition section 3 and the bit deletion section 7 side, respectively. As a result, after the bit information is added to the compressed signal from the relay line by the bit addition unit 3,
After the discrimination information is added by the discrimination information adding means 5 via the selector 4 and relayed by the exchange 1, the bit information is deleted by the bit deleting unit 7, and another relay line is passed through the selector 8. Sent out to.

On the other hand, when the discrimination information detecting means 9 does not detect the discrimination information about the signal from the exchange 1, the selector switching control means 10 switches the selectors 4 and 8 to the decoding section 2 and the encoding section 6 side. As a result, the exchange 1
The signal from the terminal accommodated in the switch is encoded by the encoding unit 6 from the exchange 1 and is output to the transmission line through the selector 8. The compressed signal from the game is decoded by the decoding unit 2 and is sent to the terminal accommodated in the exchange 1 as a local station drop signal via the selector 4 and the exchange 1.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 2 is a block diagram showing a signal relay transmission system as an embodiment of the present invention. In the one shown in FIG. 2, the relay exchange 11 includes a plurality of time division multiplexers 13.
-I (I = 1, 2, ...) Through a plurality of trunk lines 14
-I (each trunk line 14-I is composed of an upstream trunk line 141-I and a downstream trunk line 142-I), and this relay exchange 11 is a premises that accommodates a plurality of extension terminals 12a. It is connected to the exchange 12.

Then, each time division multiplexer 13-I
An interface [exchange interface (PBX interface)] 13a-I on the exchange 11 side and a port (network port) 13k-I on the trunk line side are provided.
Further, between the PBX interface 13a-I and the network port 13k-I, the decoding unit 13b-I, the bit adding unit 13c-I, the delay unit 13c'-I, the selector 13d-I are provided on the incoming side of the exchange 11. , The discrimination information adding section 13e-I, and the encoder 11f-I, the bit deleting section 13g-I, on the outgoing line side of the exchange 11.
It has a delay unit 13g'-I, a selector 13h-I, and a discrimination information detection unit 13i-I. It also includes a selector switching control unit 13j-I.

Here, the decoding unit 13b-I uses the trunk line 1
For example, a 16 Kbps compressed signal (of FIG. 5) from 4-I is decoded. Bit adder 13c-I
Is to add bit information so that the exchange 11 processes the compressed signal from the trunk line 14-I. That is,
Bits are added as shown in FIG. 5 in order to adapt the 16 Kbps compressed signal (in FIG. 5) from the trunk line to the processing speed (64 Kbps) in the exchange 11.

The delay unit 13c'-I adjusts the time between the decoding processing time in the decoding unit 13b-I and the bit addition time in the bit addition unit 13c-I. The selector 13d-I selects either the signal from the decoding unit 13b-I or the signal from the bit addition unit 13c-I.

The discrimination information adding section 13e-I adds the frame bit F as discrimination information to the output signal from the selector 13d-I. The frame bit F is the S / N of the signal. It is added to the LSB so as not to deteriorate it. Here, when the frame bit F is added to the signal from the decoding unit 13b-I, it becomes as shown in FIG. 5, and when the frame bit F is added to the signal from the bit adding unit 13c-I, It looks like 5.

The coding unit 13f-I compresses the signal (64 Kbps) from the exchange 11 to 16 Kbps for coding. The bit deleting unit 13g-I deletes bit information from the signal from the exchange 1 in order to restore the signal from the exchange 11 to a compressed signal. That is, the signal of 64 Kbps from the exchange 11 (in FIG. 5).
From the 16 Kbps compressed signal (Fig. 5).
No)).

The delay unit 13g'-I adjusts the time between the coding processing time in the coding unit 13f-I and the bit deletion time in the bit deletion unit 13g-I. The selector 13h-I selects either the signal from the encoding unit 13f-I or the signal from the bit deleting unit 13g-I.

The discrimination information detecting section 13i-I is provided in the exchange 11
Frame bit F as discrimination information for signals from
The presence or absence of is detected. Selector switching control unit 13
When the discriminant information detection unit 13i-I detects the frame bit F of the signal from the exchange 11, the selectors 13d-I and 13h-I are connected to the bit addition unit 13c-I and the bit deletion unit 13g. When the frame bit F is not detected in the signal from the exchange 11, the selectors 13d-I and 13h-I are switched to the decoding unit 13b-I and the encoding unit 13f-I, respectively.

The decoding unit 13b-I, the bit adding unit 13c-I, the delay unit 13c'-I, and the selector 13d-.
I, discrimination information addition unit 13e-I, encoding unit 13f-I,
The bit deletion unit 13g-I, the delay unit 13g'-I, the selector 13h-I, the discrimination information detection unit 13i-I, and the selector switching control unit 13j-I are incorporated in the same module.

FIG. 5 shows the number of bits of each PCM signal, is 64 KPCM and has 8 bits, is 64 KPCM signal is compressed to 16 KPCM into 2 bits, and is Converted to 16KP
6 bits are added to the 2-bit signal of CM to make it apparently 8 bits, is added with the frame bit F which is the discrimination information, and is added with the frame bit F.

Next, the operation of this embodiment will be described. First, for example, via the exchange 11, the trunk lines 14-1, 14
The case where a signal is relayed between the two terminals (such a signal is referred to as a relay signal) will be described.

That is, in this case, the signal that has entered the exchange 11 from the trunk line 14-1 is the time division multiplexer 13.
-1 discriminant information addition unit 13e-1, the frame bit F
Is added, the discrimination information detecting unit 13i-2 of the time division multiplexing apparatus 13-2 detects the discrimination information about the signal from the exchange 11. As a result, the selector switching control unit 13j-2 of the time division multiplexing apparatus 13-2 is
Switches the selectors 13d-2 and 13h-2 to the bit addition section 13c-2 and bit deletion section 13g-2, respectively.

At this time, the relay line 14-to the exchange 11-
Although the signal also comes in from 2, the frame information F is added to this signal by the discrimination information adding unit 13e-2 of the time division multiplexing apparatus 13-2, so that the time division multiplexing apparatus 13- The discrimination information detecting unit 13i-1 of No. 1 detects discrimination information about the signal from the exchange 11. As a result, the selector switching control unit 13j-1 of the time division multiplexing apparatus 13-1 switches the selectors 13d-1 and 13h-1 to the bit adding unit 13c-1 and the bit deleting unit 13g-1 side, respectively.

As a result, the compressed signal from the relay line 14-1 is further added with bit information by the bit adding unit 13c-1, and then delay-corrected by the delay unit 13c'-1 to select the selector 13d. 1 through the discrimination information addition unit 1
In 3e-1, the frame bit F is added and the exchange 1
After being relay-exchanged by 1, the bit information is deleted by the bit deleting unit 13g-2, delay correction is further performed by the delay unit 13g-2, and another relay line 14-is connected via the selector 13h-2.
2 (see thick solid arrow A in FIG. 3).

In addition, with respect to the signal coming into the exchange 11 from the trunk line 14-2, bit information is added by the bit adding unit 13c-2 of the time division multiplexer 13-2 in the same manner. After delay correction is performed by the delay unit 13c'-2, the frame bit F is added by the discrimination information addition unit 13e-2 via the selector 13d-2, and relay switching is performed by the exchange 11, Time division multiplexer 13
−1 bit deletion unit 13g-1 deletes the bit information, delay unit 13g-1 performs delay correction, and the signal is output to relay line 14-1 via selector 13h-1 (thick solid line arrow in FIG. 3). (See B).

Next, the extension terminal 12a and, for example, the trunk line 1
A case will be described in which a call is made with a terminal of a game connected to 4-1 (so-called a case where the own station is dropped). That is, in this case, the terminal 1 accommodated in the exchange 12
The signal from 2a is sent from the exchange 11 to the time division multiplexer 1.
Although the frame bit F is not added to this signal, it is output to the discrimination information detecting unit 13h-1.
The selector switching control unit 13j-1 switches the selectors 13d-I and 13h-1 to the decoding unit 13b-1 and the encoding unit 13f-1 according to the detection information. As a result, the signal from the terminal 12a accommodated in the exchange 12 is encoded by the encoding unit 13f-1 after being output from the exchange 11, and is output to the relay line 14-1 via the selector 13h-1 ( (See thick dotted arrow A'in FIG. 4).

The compressed signal from the game is decoded by the decoding unit 1.
It is decoded by 3b-1 and sent to the terminal 12a accommodated in this exchange 11 as a local station drop signal via the exchange 13 via the selector 13d-1 (see thick dotted arrow B'in FIG. 4).

As described above, the voice encoding function and the bit addition / deletion function are provided in the same module, and the frame pulse F serving as a mark is added from the trunk line toward the exchange 11 to send a signal, whereby the exchange 11 When the frame pulse F is found by recognizing whether the signal sent from the relay line or the extension line is sent, each signal is added to each bit addition unit 13c-I, delay unit 13c'-I and bit deletion unit. 13g-I, delay unit 13g'-I, bit addition /
Deletion is performed and delays of the decoding unit 13b-I and the encoding unit 13f-I are corrected, and each selector 13d
-I and 13h-I send the bit-added / deleted signal to the relay line, and when the frame pulse F is not found, connect it to the encoding unit 13b-I and the decoding unit 13f-I and send it to the extension line. As a result, it is possible to always maintain the same quality as the one-stage relay regardless of the number of relay stages.

Further, in the case where no frame pulse is found, the trouble of adding / removing bits is saved, it is not necessary to count the number of bits to be added / deleted according to the bit rate, the hardware structure is simplified, and management is also possible. It will be easier.

Further, in the case where the own station is dropped, the signal sent to the exchange 11 is directly sent to the own station without being returned to the encoding / decoding section, so that the efficiency of use of the trunk line is improved.

[0041]

As described in detail above, according to the signal relay transmission system of the present invention, the following effects and advantages are obtained. (1) In the case of a relay signal, a bypass passage that bypasses the encoding unit and the decoding unit is provided, and a bit addition / deletion unit having the same module configuration as the encoding unit and the decoding unit is installed in the bypass passage. Also, when the discrimination information that serves as a mark is added in the direction of the exchange and the discrimination information about the signal from the exchange is detected, the selector is switched to the bit addition unit / bit deletion unit side and the discrimination information about the signal from the exchange is detected. If not, by providing selector switching control means for switching the selector to the decoding unit / encoding unit side, it has a function of distinguishing and selecting an extension line and a relay line, thereby always performing one-stage relay regardless of the number of relay stages. Equal quality can be maintained. (2) Further, when transmitting / receiving to / from the own station, it is not necessary to change the number of bits for bit addition / deletion according to the bit rate of the voice encoder and the bit addition / deletion is omitted, and the hardware structure is simplified. Also, management becomes easier, and the setting of the exchange can be set without considering the extension / relay line. (3) Further, in the case where the own station is dropped, the efficiency of use of the trunk line can be improved because it goes directly to the own station via the voice encoder without passing through the trunk line.

[Brief description of drawings]

FIG. 1 is a principle block diagram of the present invention.

FIG. 2 is a block diagram showing an embodiment of the present invention.

FIG. 3 is a block diagram illustrating an operation of one embodiment of the present invention.

FIG. 4 is a block diagram illustrating the operation of the embodiment of the present invention.

FIG. 5 is a diagram illustrating the operation of the embodiment of the present invention.

FIG. 6 is a block diagram showing a conventional example.

FIG. 7 is a diagram illustrating an operation of a conventional example.

[Explanation of symbols]

 1 Switch 2 Decoder 3 Bit Deleter 4 Selector 5 Discrimination Information Adder 6 Encoder 7 Bit Adder 8 Selector 9 Discrimination Information Detector 10 Selector Switching Control 11 Switch 12 Private Branch 12a Terminal 13-I Time Division Multiplexing Device 13a-I PBX interface 13b-I decoding unit 13c-I bit deleting unit 13c'-I delay unit 13d-I selector 13e-I discrimination information adding unit 13f-I encoding unit 13g-I bit adding unit 13h- I selector 13i-I discrimination information detector 13j-I selector switching controller 13k-I network port 14-I trunk line 101 exchange 102 private branch exchange 102a terminal 103 time division multiplexer 104 PBX interface 105 network port 106 bit addition / deletion Vessel 107 Encoder

Claims (1)

Claim: What is claimed is: 1. A decoding unit (2) for decoding a compressed signal from a relay line on the incoming line side of an exchange (1), and a module within the same module as the decoding unit (2). A bit adding section (3) for adding bit information for processing the compressed signal from the relay line in the exchange (1), a decoding section (2) and the bit adding section (3). The selector (4) for selecting either one and the discrimination information adding means (5) for adding discrimination information to the output signal from the selector (4) are provided, and the selector (4) is provided on the outgoing line side of the exchange (1). An encoding unit (6) for compressing and encoding a signal from the exchange (1), and a signal provided from the exchange (1) provided in the same module as the encoding unit (6) and restored to a compressed signal. Therefore, the exchange (1)
A bit deleting section (7) for deleting the bit information from the signal from the switch, a selector (8) for selecting one of the encoding section (6) and the bit deleting section (7), and the exchange (1). ), And the discrimination information detecting means (9) for detecting the presence or absence of the discrimination information, and the discrimination information detecting means (9) detects the discrimination information for the signal from the exchange (1). Then, the selectors (4, 8) are switched to the bit adding section (3) and the bit deleting section (7) side, and if the discrimination information is not detected for the signal from the exchange (1), the selector (4 , 8)
A signal relay transmission system, characterized in that selector switching control means (10) for switching between the decoding unit (2) and the encoding unit (6) is provided.