JP3514208B2 - Multiplexed audio signal processing device, method and recording medium recording program - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex voice signal processing apparatus which is provided between a radio base station and a mobile switching center in a digital mobile communication system, and which converts a highway signal encoding method from both sides and sends it out. The present invention relates to a recording medium on which a method and a program used therefor are recorded.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a schematic configuration of a conventional digital mobile communication system. In FIG.
In the wireless section between the mobile device 100 and the wireless base station 200, a high-efficiency coded voice signal is used for the purpose of effective use of frequency and increase of system capacity. As the high efficiency encoding algorithm, for example, VSELP system, AC
The ELP method and the PSI-CELP method are available.

In addition, in the public communication network 500 after the mobile communication switch 400, the companding characteristic is μ-law / A-la.
A PCM coded audio signal using w is used. The multiple voice signal processing device 300 uses the high-efficiency coded voice signal in these wireless sections and the PCM in the public fixed communication network.
The signal conversion between the encoded voice signal is performed.

In a conventional system, for example, Japanese Patent Laid-Open No. 5-8
As disclosed in Japanese Patent No. 3373, the multiple voice signal processing device 3
00 and the mobile switching center 400 can be monitored for highway signals.

[0005]

Demand for automobiles and mobile phones is rapidly expanding, but when a call failure occurs,
Although there is a highway monitoring means between the mobile communication switch and the multiple voice signal processing device, there is no means for monitoring the highway signal between the radio base station and the multiple voice signal processing device, and it takes time to separate the highway signals. That is, when a failure such as a call failure occurs in the actual system and the radio base station 200 and the multiplex audio signal processing device 300 are suspected of failure, the highway between the wireless base station 200 and the multiplex audio signal processing device 300. The signal condition needs to be investigated. However, there is no means for monitoring and confirming the highway signal on the side of the multiplex audio signal processing device, and at present, an evaluation jig is connected to the highway terminal on the back of the device, or a card inside is pulled out to display the DSP.
It was necessary to connect the ICE to the CPU and the CPU to perform the work while interrupting the work many times, and the work efficiency was not very good.

According to the present invention, by connecting a general-purpose PC to the PC connector on the front of the apparatus without interrupting the operation (service), the contents of the radio base station side highway signal can be easily and quickly confirmed. Is intended.

[0007]

In order to achieve such an object, in the multiplex audio signal processing device according to the present invention,
The first multiplex-encoded audio signal according to the first encoding method that is input is converted into the second multiplex-encoded audio signal according to the second encoding method and is output, and the second multiplex input is input. Converting means for converting the coded encoded speech signal into a first multiplexed coded speech signal and outputting the same; capturing means for capturing the input and output first multiplexed encoded speech signals; and the captured signal Is provided, and interface means to which a device for extracting and analyzing the stored signal is connected.

Further, in the multiplex audio signal processing method according to the present invention, the input first multiplex-encoded audio signal according to the first encoding system is input to the second multiplex-encoded audio signal according to the second encoding system. A conversion procedure of converting the signal into a signal and outputting the same, and converting the input second multiplexed coded audio signal into a first multiplexed coded signal and outputting the first multiplexed coded signal; A capturing procedure for capturing the encoded audio signal and a storing procedure for storing each of the captured signals are provided.

Further, in the recording medium in which the program according to the present invention is recorded, the inputted first multiplex-encoded audio signal according to the first encoding system is subjected to second multiplex-encoding according to the second encoding system. A conversion process of converting the input second multiplexed encoded audio signal into an audio signal and outputting the converted audio signal, and converting the input second multiplexed encoded audio signal into a first multiplexed encoded audio signal and outputting the first multiplexed encoded audio signal; The program for executing the capturing process for capturing the multiple encoded voice signal and the storage procedure for storing the captured signal is recorded.

Further, in the above-described multiple audio signal processing device, method and recording medium, the first multiple encoded audio signal is a high efficiency encoded audio signal, and the second multiple encoded audio signal is a PCM code. And the first multi-coded voice signal is a signal transmitted to and received from a radio base station in the mobile communication system,
The input second multiple encoded voice signal may be a signal transmitted / received to / from a mobile communication exchange in a mobile communication system.

The first multi-coded voice signal may be fetched from a time slot of a required channel.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a multiplex audio signal processing device according to an embodiment of the present invention. In the present embodiment, an HW selection circuit 7 that selects two highway signals, an upstream and a downstream highway signal, and a channel selection circuit 8 that selects a required time slot signal from the highway signal, S / P conversion circuit 9 for converting a selected serial signal into a parallel signal, and a RAM for a signal under test for storing a plurality of frames of the selected and converted signal
6 and a personal computer (hereinafter referred to as PC) interface 10 are provided.

With the above configuration, by utilizing the PC interface 10 function of the CPU 5 provided for program download, a high-way signal on the radio base station side is fetched and stored by adding a RAM and a simple logic circuit to the conventional circuit. However, it can be easily monitored by the maintenance PC 11.

In FIG. 1, the multiple voice signal processing device is
A signal processing unit 1a to 1n for mutually converting a PCM encoded voice signal and a high efficiency encoded signal such as VCELP, a master program memory 2 for storing programs of the signal processing unit 1a to 1n and the CPU 5, and a highway clock ( HW
CLK), the frame pulse (FLCLK), and the time slot position information (TS information), a time slot selection signal CODLD is generated and signal processing units 1a to 1n and C are generated.
It is provided with a COD signal timing generation section 3 for sending to the OD signal multiplexing circuit 4.

Further, the frame sync signal (or sync pattern) from each of the encoders 101a to 101n in the signal processing section is detected, and the outputs of the encoders 101a to 101n are output based on the detected sync signal. A COD signal multiplexing circuit 4 for switching and transmitting a time division multiplexed audio signal in synchronization with the signal CODLD, and a CPU 5 for controlling download processing of the program of the master program memory 2 to the signal processing units 1a to 1n are provided. There is.

Further, a RAM 6 for a signal under test, which stores a plurality of frames of signals taken in from the S / P conversion circuit 9 according to an instruction from the CPU 5, and an up and down line between the radio base station according to an instruction from the CPU 5. HW selection circuit 7 for selecting a highway signal (multiplex encoded signal input and multiple encoded signal output), and a channel selection circuit 8 for selecting and outputting a time slot signal required for the highway signal corresponding to the signal CODLD. An S / P conversion circuit 9 that converts a selected serial signal into a parallel signal, a PC interface 10 that can be connected to an external PC 11, and a bus 100 are provided.

The signal processing unit 1n includes an encoder 101n, a decoder 102n and a program memory 103n. The encoder 101n converts the 64 kbps PCM encoded voice signal SI into VCELP, ACELP, PSI-CELP.
It is converted into a high-efficiency coded voice signal CO, etc., and is transmitted in a highway interface format with a radio base station.

Decoder 102n is VCELP, ACEL
P, PSI-CELP, or other high-efficiency coded audio signal CI is extracted from the highway interface format 6
It is decoded into a 4 kbps PCM encoded audio signal SO. Further, the frame synchronization signal (or the synchronization pattern) is extracted and transferred to the encoder 101n, which is the basis of the synchronization signal when the encoder multiplexes.

The encoder 1 is included in the program memory 103n.
01n and the processing programs of the decoder 102n are stored. The other encoders 101a and decoders 102a are similarly configured.

FIG. 2 shows a highway clock (HWCL
K), frame pulse (FLCLK), signal CODL
D shows the relationship between time slots. Figure 3 is full rate 6
The multiplexed signal output frame in the case of CH (channel) is shown.

Next, the operation will be described. First, the basic operation of the multiple audio signal processing device will be described. When the present multiple audio signal processing device is powered on, the CPU 5 is activated and the program in the master program memory 2 is loaded via the bus 100 into the program memory 103a of the signal processing units 1a to 1n.
-10n downloaded. When this program boot processing is completed, the signal processing units 1a to 1n execute processing according to the contents of the master program.

That is, the decoder 102n decodes the signal of the channel N from the input high-efficiency multiplex encoded audio signal CI, extracts the MHF (MF) frame synchronization signal, and transmits the timing to the encoder 101n. To do. The encoder 101n converts the PCM encoded voice signal SI into a high-efficiency encoded signal CO, puts the data on the highway interface format with the radio base station, and also performs MHF according to the timing from the decoder 103n.
(MF) A frame synchronization signal is added and transmitted.

The COD signal timing generator 3 selects a valid time slot from the high-efficiency multiplex encoded signal input based on the highway clock, the frame pulse and the time slot position information, and decodes the selected multiplex voice signal CI. 103n and outputs the time slot selection signal CODLD.

In the COD signal multiplexing circuit 4, MHF (MF) synchronizing signals of the output signals of the encoders 101a to 101n are extracted, and their timings are compared to each other to make majority decision synchronization (for example, when n = 6, 6CH is used. Of these, the timing at which synchronization is performed on 4CH or more is determined as the output timing) is taken as the formal synchronization signal. This frame synchronization signal MH
F (MF) is forcibly added to the outputs of the encoders 1a to 1n, and 6 of n = 6 is set on the basis of the MHF (MF) synchronization signal.
In the case of CH, the outputs of the encoders 1a, 1b, 1c, 1d, 1e, 1f are switched in the order of channels 0, 1, 2, 3, 4, 5 to output multiplexed outputs as shown in FIG.

Next, the monitor function will be described. CPU
Reference numeral 5 denotes a PC interface 10 such as RS232.
PC11 is connected to 0. The PC 11 gives an instruction to select a highway signal to be monitored. That is, by controlling the SC input of the HW selection circuit 7, the multiple coded signal input (up)
And multiplex encoded signal output (downlink). The selected highway signal is composed of 32 time slots in the case of 2 MHW, but the time slot effective in this multiplex audio signal processing device has been extracted by the COD signal timing generation unit 3 and the output of the signal CODLD is turned on. Then, the gate of the channel selection circuit 8 is opened, the S / P conversion circuit 9 in the next stage converts the serial signal into an 8-bit parallel signal, and the fetched data is latched until the next data comes.

FIG. 2 shows the relationship between the highway signal and the CODLD output when the time slot is designated as 1 (TS01). The 8-bit data is written in the signal-under-test RAM 6 through the bus 100 according to an instruction from the CPU 5.

The writing and reading of the RAM 6 for the signal under test are performed by the CPU 5, but the written data can be read and analyzed by the PC 11. Eg 1
RAM when time slot data is 64 Kbps
When the capacity is 4 Mbit, it takes about 62.5 seconds, which enables data monitoring for about 1 minute.

According to the present embodiment, the analysis of the high-efficiency multiplex-encoded voice signal, which is the highway signal between the multiple voice signal processing device and the radio base station, does not require any special jig or device for maintenance. This can be easily done by connecting a PC. The reason is that the HW selection circuit 7 that uses the output of the COD signal timing generation unit 3 to select a channel.
And an RA for the signal under test that stores the S / P converted data
M6 and P such as RS232C that can be connected to general-purpose PC 11
This is because the C interface 10 is added so that a high-efficiency multiplex encoded voice signal is taken in and stored.

The master program memory 2 for storing the programs of the CPU 5 and the signal processing units 1a to 1n constitutes a recording medium recording the program according to the present invention. As such a storage medium, an optical disc, a magneto-optical disc, a floppy (registered trademark) disc, a magnetic card, a magnetic tape, a semiconductor storage device, or the like can be used.

[0030]

As described above, according to the present invention, a high efficiency multiplex encoded voice signal which is a highway signal between the multiple voice signal processing device and the radio base station is taken in and stored, so that a special jig can be used. By connecting a maintenance PC, the highway signal confirmation work can be easily performed without the need for a device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a multiplex audio signal processing device according to an embodiment of the present invention.

FIG. 2 is a timing chart showing the relationship between signals.

FIG. 3 is a timing chart showing the output of a multi-coded audio signal.

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

[Explanation of symbols]

1a to 1n signal processing unit 101a-101n encoder 102a to 102n decoder 2 Master program memory 3 COD signal timing generator 4 COD signal multiplexing circuit 5 CPU 6 RAM for signal under test 7 HW selection circuit 8 channel selection circuit 9 S / P conversion circuit 10 PC interface 11 PC CI High efficiency coded signal input CO High efficiency coded signal output SI PCM audio signal signal input SO PCM audio signal signal output 100 mobile 200 wireless base stations 300 Multiplex audio signal processor 400 mobile telecommunication switch 500 public communication network

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 H04M 3/00 H04M 3/08-3/40 H04M 7/00-7/16 H04Q 1 / 20-1/26 H04Q 7/00-7/38

Claims (12)

(57) [Claims] 1. A first encoding method according to a first encoding method
The multiplex-encoded voice signal of the second encoding system is converted into the second multiplex-encoded voice signal and output, and the input second multiplex-encoded voice signal is converted into the first multiplex-coded signal. Conversion means for converting into a converted audio signal and outputting the converted signal, capturing means for capturing the input and output first multi-coded audio signal, storage means for storing the captured signal, and the stored signal And a means for taking out and analyzing the equipment, and an interface means to which the equipment is connected. 2. The first multiple-coded speech signal is a high-efficiency coded speech signal, and the second multiple-coded speech signal is a PCM-coded speech signal. Multiple audio signal processing device. 3. The first multi-coded voice signal is a signal transmitted to and received from a radio base station in a mobile communication system, and the second multi-coded voice signal is a mobile communication switch in the mobile communication system. 2. The multiple audio signal processing device according to claim 1, wherein the multiple audio signal processing device is a signal transmitted / received to / from. 4. The multiplex audio signal processing apparatus according to claim 1, wherein said acquisition means acquires from the time slot of a required channel of said first multiplex encoded audio signal. 5. A first encoding method according to a first encoding method
The multiplex-encoded voice signal of the second encoding system is converted into the second multiplex-encoded voice signal and output, and the input second multiplex-encoded voice signal is converted into the first multiplex-coded signal. A conversion procedure for converting the signal into a converted audio signal and outputting the converted signal, a capturing procedure for capturing the input and output first multi-coded audio signal, and a storage procedure for storing the captured signal. Multiple audio signal processing method. 6. The first multiplexed coded speech signal is a high efficiency coded speech signal, and the second multiplexed coded speech signal is a PCM coded speech signal. Multiplexed audio signal processing method. 7. The first multiple encoded voice signal is a signal transmitted to and received from a radio base station in a mobile communication system, and the second multiple encoded voice signal is a mobile communication switch in a mobile communication system. 6. The multiple audio signal processing method according to claim 5, which is a signal transmitted / received to / from. 8. The method for processing multiplex audio signals according to claim 5, wherein the acquisition procedure is to acquire from the time slot of a required channel of the first multiplex encoded audio signal. 9. A first encoding method according to a first encoding method
The multiplex-encoded voice signal of the second encoding system is converted into the second multiplex-encoded voice signal and output, and the input second multiplex-encoded voice signal is converted into the first multiplex-coded signal. A program for executing a conversion process of converting into a converted audio signal and outputting it, a capture process of capturing the input and output first multiple-coded audio signal, and a storage procedure of storing the captured signal. A recording medium on which is recorded. 10. The first multiple-coded speech signal is a high-efficiency coded speech signal, and the second multiple-coded speech signal is a PCM-coded speech signal. Recording medium recording the program of. 11. The first multiplex-encoded voice signal is a signal transmitted / received to / from a radio base station in a mobile communication system, and the input second multiplex-encoded voice signal is in the mobile communication system. The recording medium recording the program according to claim 9, wherein the recording medium is a signal transmitted / received to / from a mobile communication exchange. 12. The recording medium recording the program according to claim 9, wherein the capturing process is performed from a time slot of a required channel of the first multiplex encoded audio signal.