JPH104582A - Digital signal speech monitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain voice monitoring for a high multiplex signal on a highway between a voice processing unit and a radio base station in the speech monitor for a digital mobile communication system represented by a digital cellular telephone system. SOLUTION: A high multiplex signal on a highway between a voice processing unit and a radio base station is given to a code conversion section 8 from an input terminal 7. The code conversion section 8 is made up of a time slot selection section 81, a channel selection section 82 and a format conversion section 83. A channel designation section 9 selects a time slot and a channel desired to be monitored from the signal. The format conversion section 83 converts the signal into a signal format in 64kbps at an exchange network side and the output of the code conversion section is given to an input terminal 1 receiving a highway signal between a conventional processing unit and the exchange.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone call monitor for a digital mobile communication system represented by a digital car telephone.

[0002]

2. Description of the Related Art FIG. 4 is a schematic system configuration diagram of a digital mobile communication system.

In a digital mobile communication system, a highly efficient coded voice signal is used in a wireless section between the mobile station 100 and the base station 200 for the purpose of effectively utilizing the frequency and increasing the system capacity. For example, VSELP (Vector
Sum Excited Linear Predi
ction) system or PSI-CELP (Pitch S)
ynchronousInnovation-CEL
P) system. Further, in the public fixed communication network 500 after the mobile communication exchange 400, the μ-law
An audio signal based on a non-linear quantized PCM code using / A-law is used.

[0004] The voice processing apparatus 300 performs signal conversion between a high-efficiency coded voice signal in these radio sections and a PCM-coded voice signal in a public fixed communication network.

[0005] There are three operation modes of the audio processing apparatus 300: an audio mode, a through mode, and a non-audio mode.

[0006] The voice mode is a mode for making a call between the mobile station 100 and the fixed station terminal 600 via the base station 200. In this case, the voice processing apparatus 300 performs high-efficiency coding of a radio section. PCM of public fixed communication network for voice signal
It is converted to an encoded audio signal and output.

[0007] The through mode is a mode in which the mobile station 100 communicates with another mobile station (not shown). In this case, the voice processing apparatus 300 performs high-efficiency coding of a radio section. The audio signal is output as it is without conversion processing. This means that the final partner section is also a wireless section,
This is because a highly efficient encoded audio signal is used, so that the audio signal is prevented from deteriorating due to repetition of conversion processing in the middle.

The non-voice mode is a mode for data communication such as facsimile, and the voice processing device 300 outputs the received data signal as it is.

Conventionally, as shown in Japanese Patent Application Laid-Open No. 5-83373, for example, this type of call monitoring device sets a line in a digital mobile communication exchange to a call outside a normally used μ-law PCM signal. In addition, even a speech signal using another encoding method such as a through-mode speech is used for the purpose of correctly monitoring.

That is, in the configuration of the mobile communication system, a highway signal between the voice processing device 300 and the mobile communication exchange 400 can be monitored.

An output signal of the voice processing device described below is a 64 Kbps signal of one time slot selected from a highway signal between the voice processing device 300 and the mobile communication switching system 400 and from a plurality of time slots through a time slot selection unit. Which is the same as that described in Japanese Patent Laid-Open No.
The output is equivalent to the output of the branch circuit 4 of JP 83373.

FIG. 5 is a block diagram showing the configuration of a conventional digital signal telephone call monitoring device.

This conventional digital signal communication monitor device has an input terminal 1 for inputting an output signal of a voice processing device,
A signal identification unit 2 for identifying which mode the input signal is in, and a code mode selection for separating and connecting the signal input to the input terminal 1 into three types of outputs according to the identification result of the signal identification unit 2 And a decoder 41 which is connected to an output corresponding to the through mode of the code mode selecting unit 3 and converts the high efficiency coded voice signal transmitted thereto into a PCM coded voice signal in accordance with the coding algorithm. When,
A decoding unit 4 connected to an output corresponding to the non-voice mode of the code mode selection unit 3 and configured to convert a non-voice data signal transmitted thereto into a silent PCM coded signal; A PCM monitor circuit 5, which is connected to an output corresponding to the audio mode of the selection unit 3 and an output of the decoding unit 4, converts the PCM coded signal transmitted to each to an analog signal and outputs the analog signal, and monitors the PCM monitor circuit 5. And an output terminal 6 for outputting an analog signal.

Next, the operation of the conventional digital signal communication monitor device will be described.

The signal from the audio processing device input to the input terminal 1 is drawn into the synchronization detection circuit 21 of the signal identification unit 2. This synchronization detection circuit detects the synchronization pattern of the received signal and compares it with the contents of the synchronization pattern memory 22 that stores the synchronization patterns of the audio mode, the through mode, and the non-audio mode. Signal. This identification result is transmitted to the code mode selection unit 3.

The code mode selector 3 receiving the identification information of the input signal mode outputs 0 for the audio mode, 1 for the through mode, and 2 for the non-voice mode. To connect the input signal to the output corresponding to each mode. As shown in FIG. 5, the output 0 of the code mode selection unit 3 is connected to the PCM monitor circuit 5 via the decoder 41, and the output 2 is connected to the PCM monitor circuit 5 via the decoder 42.

In the audio mode connected to output 0, the signal transmitted thereto is already
Since it has been converted to an encoded audio signal,
It can be output to the monitor circuit 5 and converted into an analog audio signal, which can be used for monitoring.

In the through mode connected to the output 1, the signal transmitted there remains as a high-efficiency coded voice signal. The signal is output to the circuit 5 to be converted into an analog audio signal and supplied to a monitor.

In the non-speech mode connected to the output 2, the signal transmitted there is a data signal, which, if monitored, only produces unpleasant noise, so the decoder 42
To convert the signal into a silent PCM-encoded audio signal, and then output it to the PCM monitor circuit 5. The analog audio output is, of course, silent.

[0020]

In the conventional digital signal telephone call monitoring device, it was not possible to monitor the sound of the highway signal between the voice processing device and the radio base station.

The reason is that the signal speed and the signal format are different between the highway signal between the voice processing device and the exchange, which can be monitored conventionally, and the highway signal between the voice processing device and the radio base station.

It is an object of the present invention to provide a digital signal communication monitoring device capable of monitoring not only a highway signal between a voice processing device and an exchange but also a highway signal between a voice processing device and a radio base station.

[0023]

The present invention employs the following means to solve the above-mentioned problems.

(1) By comparing the signal type of the highway signal between the voice processing device and the exchange with a synchronization pattern stored in advance, the input signal is identified to identify the non-voice detection and coding mode. A code mode selection unit selectively connected to a decoder of a corresponding algorithm, a decoding unit for converting a coded signal into a PCM code according to a coding algorithm, and a PCM signal connected to an output of the decoding unit. And a PCM monitor circuit for converting a signal into an analog audio signal. In the digital signal communication monitor device, a desired signal format is selected by selecting an arbitrary channel from a high-multiplexed signal on the highway between the audio processing device and the radio base station. A code specifying unit for selecting a channel of a highly multiplexed signal is added to the code converting unit, and the code converting unit Output, digital signal call monitoring device connected to the input of the signal identification unit.

(2) The digital signal communication monitoring device according to (1), wherein the code conversion unit comprises a time slot selection unit, a channel selection unit, and a format conversion unit.

(3) The digital signal communication monitoring device according to (2), wherein an input signal selection switch is connected between the format converter and ground.

(4) In the digital signal communication monitoring device according to (2), the format conversion unit is replaced with a decoder having both the function of the format conversion unit and the function of the decoding unit. .

[0028]

The high-multiplexed signal on the highway between the voice processing device and the radio base station is converted into a desired format of the signal between the voice processing device and the exchange through the code conversion unit, so that the signal between the voice processing device and the radio base station is converted. Audio monitoring of high-multiplexed signals on highways is also possible.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail with reference to FIG.

First, the configuration will be described.

FIG. 1 is a block diagram showing a first embodiment of a digital signal communication monitoring device according to the present invention. The input terminal 1 receives a 64 Kbps coded signal branched from the output highway signal of the voice processing apparatus to the switching network. The signal identification unit 2 includes a synchronization detection circuit 21 for identifying a non-speech mode and various encoded data, and a synchronization pattern memory 22 for storing the identification pattern. The signal identification unit 2 is connected to the input terminal 1 and identifies an input signal. To identify the non-speech detection and coding mode. The code mode selection unit 3 is connected to the input terminal 1 and the synchronization detection circuit 21, and selectively connects an input signal to a decoder of a corresponding algorithm according to the output of the synchronization detection circuit 21. The decoding unit 4 is connected between the code mode selection unit 3 and the PCM monitor circuit 5 and includes various decoders 41 to 4n that change a coded signal into a PCM code according to a coding algorithm. PCM monitor circuit 5
Is connected to the output of the decoding unit 4 and converts PCM audio into an analog audio signal. Analog audio signal output terminal 6
Is connected to the output of the PCM monitor circuit 5. The input terminal 7 receives a highway signal between the audio processing device and the wireless base station. The code conversion unit 8 includes a time slot selection unit 81 that selects and outputs an arbitrary time slot from the highway signal, a channel selection unit 82 that selects an arbitrary channel from the highly multiplexed signal of the arbitrary time slot, A format conversion unit 83 that converts the efficiency coded signal into a signal format of 64 Kbps is connected between the input terminal 7 and the inputs of the signal identification unit 2 and the code mode selection unit 3, and the high multiplexing input from the input terminal 7 is performed. Any one channel is selected from the converted signal and converted to a signal format of 64 Kbps. The channel specifying unit 9 is connected to the code converting unit, and is an input unit for specifying a selected channel of the high-multiplexed coded signal in the code converting unit 8, and is configured by a switch or the like.

Next, the operation of the circuit of FIG. 1 will be described.

A highway signal between the voice processing device and the radio base station is connected to an input terminal 7, and a desired channel of a desired slot to be monitored is specified by a channel specifying unit 9. For example, if the channel is designated as the k-th channel in the m-th slot, the time slot selector 8
In step 1, only the m-th slot is extracted from a plurality of time slots on the basis of a highway frame pulse and output to the next-stage channel selection unit 82. Channel selection unit 8
In 2, a high-efficiency coded signal of only the k-th channel is extracted from the highly multiplexed signal according to the designation of the channel designation unit 9, and output to the format conversion unit 83 in the next stage. The format conversion unit 83 converts the high-efficiency coded signal into a 64
The signal is converted into a signal of Kbps and output. Therefore, the transcoder 8 converts the signal of the k-th channel of the m-th slot into 64 signals among the highway signals between the voice processing device and the radio base station.
The signal is converted into a high-speed signal format on the switching network side of Kbps and output.

The output of the code conversion unit 8 is connected to the input terminal 1, and after the input terminal 1, an audio monitor circuit as described with reference to FIG. 5 operates.

That is, the signal input to the input terminal 1 is drawn into the synchronization detection circuit 21 of the signal identification unit 2.
In this synchronization detection circuit, the synchronization pattern of the pulled-in signal is detected and compared with the contents of the synchronization pattern memory 22 which stores each synchronization pattern such as a full rate through mode, a half rate through mode, and a non-voice mode. , In which mode the signal is. This identification result is transmitted to the code mode selection unit 3. The code mode selection unit 3 having received the identification information of the input signal mode,
An output is selected according to each mode, and an input signal is connected to an output corresponding to each mode. Code mode selector 3
Are connected to the PCM monitor circuit 5 via the decoder 4n.

When the mode connected to the output n is the full rate through mode, the signal transmitted there remains the high-efficiency coded voice signal, so that the signal is converted to the PCM coded voice signal by the decoder 4n. Thereafter, the signal is output to the PCM monitor circuit 5 to be converted into an analog audio signal and supplied to the monitor.

When the mode connected to the output n is the non-voice mode, the signal transmitted there is a data signal, which is converted by the decoder 4n into a silent PCM-coded voice signal, and thereafter, the PCM monitor. Output to the circuit 5. The analog audio output is, of course, silent.

As described above, one channel of the high-multiplex coded signal on the highway between the audio processing device and the radio base station can be monitored for audio.

Next, a second embodiment of the present invention will be described with reference to FIG.

FIG. 3 is different from FIG. 1 in that the format converter 83 of the code converter 8 in FIG. 1 is replaced by a decoder 84. Here, the function of the decoder 84 is such that the format conversion unit 83 is added to the functions of the decoders 41 to 4n of the decoding unit 4, that is, the high-efficiency coded signal is decoded according to the coding algorithm and the PCM 6 is used.
Convert to a 4 Kbps signal.

A highway signal between the voice processing device and the radio base station is connected to the input terminal 7, and a desired channel of a desired slot to be monitored is specified by the channel specifying unit 9. For example, if the first channel of the second slot is designated, the time slot selecting unit 8
In step 1, only the second slot is extracted from a plurality of time slots on the basis of the highway frame pulse, and output to the next-stage channel selection unit 82. Channel selection unit 8
In 2, in accordance with the designation of the channel designation unit 9, the highly efficient coded signal of only the first channel is extracted from the highly multiplexed signal,
The signal is output to the decoder 84 at the next stage. The decoder 84 converts the high-efficiency coded signal into a PCM signal of 64 Kbps and outputs it. Therefore, in the transcoder 8, of the highway signal between the voice processing device and the radio base station, the first slot of the second slot is used.
The channel signal is converted to a 64 Kbps PCM signal and output.

The output of the code conversion section 8 is connected to the input terminal 1, and the code mode selection section 3 which has received the input signal mode identification information selects the output 0 in the case of the audio mode.
Connect the input signal to the output corresponding to the mode.

In the audio mode connected to the output 0, since the signal transmitted there has already been converted into a PCM encoded audio signal by the decoder 84, it is output as it is to the PCM monitor circuit 5 and converted into an analog audio signal. As a result, one channel of the high-multiplexed coded signal on the highway between the voice processing device and the radio base station can be monitored for voice.

[0044]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The operation of one embodiment of the first embodiment of the present invention will be described in detail.

Here, the high-multiplexed signal of the highway between the audio processing device and the radio base station is converted to 2 MHz (8 kHz × 8 bit).
X32CH = 2.048 MHz), and the multiplicity of the highly efficient coded signal is 6 (VSELP: full rate).

Referring to FIG. 2, an input signal selection switch 10 is connected between the code converter 8 and the ground.
When the input signal selection switch 10 is turned off and the output goes to the ground level (low level), the output of the format converter 83 becomes high impedance, and the input terminal 1 receives the output highway signal to the switching network of the audio processing device. So that it does not become a burden.

When the input signal selection switch 10 is turned on and the output becomes the power supply voltage level VDD (high level), the output of the format converter 83 becomes a normal output.

Therefore, the communication between the voice processing device and the radio base station is performed in two steps.
When monitoring the MHz highway signal, the input signal selection switch 10 is turned on, and the 2 MHz highway signal between the audio processing device and the radio base station is connected to the input terminal 7;
A desired channel of a desired slot to be monitored is designated by a channel designation section 9. For example, when the first channel of the second slot is designated, the time slot selecting unit 81 extracts only the second slot from 32 tyro slots based on an 8 kHz frame pulse by the designation by the channel designating unit 9. The signal is output to the next-stage channel selection unit 82. The channel selecting unit 82 extracts a high-efficiency coded signal of only the first channel from the highly multiplexed signals of six channels according to the designation of the channel designating unit 9 and outputs the signal to the format conversion unit 83 in the next stage. The format converter 83 converts the high-efficiency coded signal into a through mode signal of 64 Kbps and outputs it. Therefore, in the transcoding unit 8, the second of the highway signals between the audio processing device and the radio base station is output.
The signal of the first channel of the slot is converted into a 64 Kbps high-speed signal format on the switching network side and output.

The output of the code converter 8 is connected to the input terminal 1, and the input terminal 1 and thereafter operate the voice monitor circuit as described with reference to FIG. One channel of the highly multiplexed coded signal of
Audio monitoring becomes possible.

[0050]

As is apparent from the above description, the present invention has the following advantages.

The first effect is that the multiplexed high-efficiency coded signal on the highway between the voice processing device and the radio base station can also be voice-monitored.

The reason for this is that a digital signal communication monitoring device capable of monitoring a highway signal between a conventional voice processing device and an exchange is provided with a high-multiplexed signal of a highway between the voice processing device and a radio base station, and a voice processing device and a switching device. This is because a code conversion unit for converting into the format of the inter-highway signal has been added.

A second effect is that when a communication failure such as one-way communication occurs during operation of the digital car / mobile phone system, it is possible to quickly determine whether the system is a base station system or an exchange system.

The reason is that the location of the audio processing device is
This is because all the uplink / downlink signals of the wireless system and the wired system can be confirmed by the conversation voice.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an example of the first exemplary embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a digital mobile communication system.

FIG. 5 is a block diagram showing a configuration of a conventional digital signal call monitoring device.

[Explanation of symbols]

 1, 7 input terminal 2 signal identification unit 3 code mode selection unit 4 decoding unit 41 to 4n decoder 5 PCM monitor circuit 6 output terminal 8 code conversion unit 81 time slot selection unit 82 channel selection unit 83 format conversion unit 84 decoder 9 Channel designation section 10 Selection switch

Claims (4)

[Claims] A signal identification unit for identifying a non-voice detection and encoding mode by identifying an input signal by comparing a signal type of a highway signal between a voice processing device and an exchange with a synchronization pattern stored in advance. A code mode selection unit selectively connected to a decoder of a corresponding algorithm, a decoding unit for converting a coded signal into a PCM code according to a coding algorithm, and a PCM signal connected to an output of the decoding unit. In a digital signal communication monitoring device comprising a PCM monitor circuit for converting to an analog voice signal, an arbitrary one channel is selected from a high-multiplexed signal on a highway between a voice processing device and a radio base station to obtain a desired signal format. A transcoding unit that performs conversion, and a channel designating unit that selects a channel of a highly multiplexed signal is added to the transcoding unit; Force, a digital signal call monitoring apparatus characterized by connecting to the input of the signal identification unit. 2. The digital signal communication monitoring device according to claim 1, wherein said code converter comprises a time slot selector, a channel selector, and a format converter. 3. The digital signal communication monitor device according to claim 2, wherein an input signal selection switch is connected between said format conversion unit and ground. 4. The digital signal communication monitor according to claim 2, wherein said format converter is replaced by a decoder having both the function of said format converter and the function of said decoder. Call monitoring device.