KR100347333B1 - Dsp module for vocoder in mobile communication system - Google Patents

Abstract

The present invention relates to a module mounted on a selector board in a control station in an International Mobile Telecommunication (IMT) -2000 asynchronous system, and more specifically, to an adaptive multi rate (AMR) voice with four digital signal processor (DSP) cores through one flash memory. The present invention relates to a DSP module for a vocoder in a mobile communication system that loads a codec algorithm and processes a voice signal of up to 80 channels. According to the present invention, a boot program and four AMR codec programs are downloaded using only one flash memory. By allowing loading, the internal configuration of the vocoder DSP module is simplified to simplify system design, reduce design and implementation costs, and accommodate more subscribers than the number of DSP cores with built-in flash memory. There is an excellent effect of being able to.

Description

DSP MODULE FOR VOCODER IN MOBILE COMMUNICATION SYSTEM}

The present invention is a module mounted on a selector board in a control station in an IMT (International Mobile Telecommunication (IMT))-2000 asynchronous system, and more specifically, one flash memory. Digital Signal Processor (DSP) is referred to as "DSP." Four AMRs are each used for adaptive multi rate (AMR).) Loading a Codec algorithm (Algorism) The present invention relates to a DSP module for vocoder in a mobile communication system that processes a voice signal of up to 80 channels by loading.

In the conventional IMT-2000 control station system, the vocoder DSP module receives a PCM (Pulse Code Modulation; PCM) voice data from the switching station 1 as shown in FIG. After compressing in units of packets, a DP port (hereinafter referred to as a "DS RAM") 20 is transmitted to the selector board interface unit 30 through a communication method, and the selector board interface unit ( Four DSPs 10 for decoding and transmitting the packet PCM voice data to the switching center 1 through the DP RAM 20 communication scheme; Upon receiving the PCM voice data compressed in the unit of packet from the base station 2, the PCM voice data is transmitted to the DSP 10 through the DP RAM 20 communication method, and the DP RAM 20 communication method from the DSP 10. A selector board interface unit 30 for transmitting the PCM voice data to the base station 2 when the PCM voice data is received; A flash memory 40 allocated to each of the four DSPs 10 and storing a boot program and a voice codec program of each of the DSPs 10; Processor Load Data (PLD) for sequentially loading the boot code and the voice codec codes stored in the four flash memories 40 into the four DSPs 10 when the four DSPs 10 are powered on or reset. "PLD".) Logic section 50; And a power supply unit 60 for supplying constant power to each component.

However, in the above-described conventional IMT-2000 control station system, the vocoder DSP module is allocated one flash memory for each of the four DSPs, so that the internal components of the vocoder DSP module are complicated and difficult to design and implement. In addition, the system cost also increased, there was a problem that is not practical.

In addition, since the DSP module for vocoder in the conventional IMT-2000 control station system has all four flash memories for program down of four DSPs, the internal space is so small that it is difficult to expand the DSP. As a result, the increase in the number of subscribers was difficult.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to implement a simple and inexpensive module in implementing a DSP module for vocoder and at the same time move to increase the number of subscribers. There is provided a DSP module for vocoder in a communication system.

In order to achieve the above object, the Vocoder DSP module in the mobile communication system of the present invention comprises: a DP RAM unit for performing DP RAM communication of compressed PCM voice data;

When receiving the PCM voice data from the switching center, the packet is compressed in a predetermined time packet unit and stored in the corresponding area of the DP RAM unit, and a read interrupt is generated. When the read interrupt is input, the PCM voice data stored in the DP RAM unit is read. A plurality of DSPs which are then decoded and transmitted to the switching center;

When receiving the compressed PCM voice data in the unit of packet from the base station is stored in the corresponding area of the DP RAM unit and outputs a read interrupt to the plurality of DSPs, while receiving a read interrupt from the corresponding DSP stored in the DP RAM unit A selector board interface unit which reads PCM voice data and transmits the same to the base station;

A flash memory connected to signal inputs of the plurality of DSPs and storing a boot code and a voice codec code;

A PLD logic unit configured to sequentially load boot codes and voice codec codes stored in the flash memory into the plurality of DSPs when the plurality of DSPs are powered on or reset; And

And a power supply unit for supplying constant power to the DP RAM unit, a plurality of DSPs, a selector board interface unit, a flash memory, and a PLD logic unit.

1 is a functional block diagram showing a configuration of a Vocoder DS module in a conventional IMT-2000 control station system;

FIG. 2 is a functional block diagram showing the configuration of a vocoder DSP module in an IMT-2000 control station system according to an embodiment of the present invention; FIG.

FIG. 3 is a diagram for describing a procedure of sequentially downloading boot codes and voice codec codes to a plurality of DSPs by a PLD logic unit in a DSP module for vocoder in the IMT-2000 control station system according to FIG. 2.

<Explanation of symbols for the main parts of the drawings>

100: DP RAM 101: 16 bit DP RAM

200: DSP 300: selector board interface

400: flash memory 500: PLD logic section

600: power supply unit 700: JTAG header unit

Hereinafter, a vocoder DSP module in an IMT-2000 control station system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a functional block diagram of a vocoder DSP module in an IMT-2000 control station system according to an embodiment of the present invention, and the vocoder DSP module in an IMT-2000 control station system according to an embodiment of the present invention is DP RAM unit 100, DSP 200 of four, selector board interface unit 300, flash memory 400, PLD logic unit 500, power supply unit 600, and JTAG (Joint Test Action Group; JTAG ".) The header unit 700 is comprised.

The DP RAM unit 100 is connected between the four DSP 200 and the selector board interface unit 300 so that a 32-bit PCM voice between the four DSP 200 and the selector board interface unit 300 is provided. It plays a role of DP data communication and consists of two 16-bit DP RAMs 101 for storing PCM voice data compressed in 32-bit packet units.

In addition, when the four DSP 200 receives the PCM voice data transmitted from the switching center 1 through the ST-bus, the four DSP 200 compresses it in units of 20 ms and stores the same in the two 16-bit DP RAMs 101. The read interrupt is generated to the selector board interface unit 300, and when the read interrupt is input from the selector board interface unit 300, the PCM voice data stored in the two 16-bit DP RAMs 101. After decoding, it decodes and transmits the decoded data to the switching center 1.

On the other hand, when the selector board interface unit 300 receives the PCM voice data compressed in packet units from the base station 2, the selector board interface unit 300 stores the read interrupt in the corresponding areas of the two 16-bit DP RAMs 101 and simultaneously reads the read interrupt. The DSP 200 outputs four DSP 200s to the corresponding DSP 200, and when the read interrupt is inputted from the DSP 200, the PCM voice data stored in the two 16-bit DP RAMs 101 is read and then read. It serves to transmit to the base station (2).

The flash memory 400 is a memory that is connected to signal input terminals of the four DSPs 200 and stores a boot code and an AMR codec code.

On the other hand, the PLD logic unit 500 is a boot code and the AMR codec code stored in the flash memory 400 when the power on (Power) or reset (Reset) of the four DSP 200, the four DSP It serves to sequentially load the 200.

In addition, the power supply unit 600 is the two 16-bit DP RAM 101, four DSP 200, selector board interface unit 300, flash memory 400, PLD logic unit 500, and The JTAG header 700 serves to supply a constant power.

Meanwhile, the JTAG header unit 700 is connected to the input / output terminals of the four DSPs 200, and the four DSP 200 debugging processing operations under the control of the operator terminal 3, and the four It performs a sequential boot code and voice codec code downloading process to the two DSP (200).

Next, the vocoder DSP module in the IMT-2000 control station system according to the embodiment having the above configuration will be described with reference to FIGS. 2 and 3.

First, a procedure for sequentially downloading the boot code and the AMR codec code by the PLD logic unit 500 to the four DSPs 200 upon power-on or reset of the four DSPs 200 will be described. This will be described with reference to 3.

First, when the power on or reset of the four DSPs 200 is detected, the PLD logic unit 500 applies "00" to the address [18:17] terminal of the flash memory 400. do.

Then, the boot code and the AMR codec code stored in the flash memory 400 are downloaded to the first DSP 200.

Subsequently, when downloading is completed, the first DSP 200 applies a downloading completion signal ACK1 to the PLD logic unit 500.

In addition, the PLD logic unit 500 receives a download completion signal ACK1 from the first DSP 200 and then applies "01" to the address [18:17] terminal of the flash memory 400. do.

Then, the boot code and the AMR codec code stored in the flash memory 400 are downloaded to the second DSP 200.

Thereafter, when the downloading is completed, the second DSP 200 applies a downloading completion signal ACK2 to the PLD logic unit 500.

In addition, the PLD logic unit 500 receives a download completion signal ACK2 from the second DSP 200 and then applies "10" to the address [18:17] terminal of the flash memory 400. do.

Then, the boot code and the AMR codec code stored in the flash memory 400 are downloaded to the third DSP 200.

Subsequently, when the downloading is completed, the third DSP 200 applies a downloading completion signal ACK3 to the PLD logic unit 500.

In addition, the PLD logic unit 500 receives a download completion signal ACK3 from the third DSP 200 and then applies "11" to the address [18:17] terminal of the flash memory 400. do.

Then, the boot code and the AMR codec code stored in the flash memory 400 are downloaded to the fourth DSP 200.

Thereafter, when the downloading is completed, the fourth DSP 200 applies a downloading completion signal ACK4 to the PLD logic unit 500.

Therefore, the program downloading operation to the four DSPs 200 is completed by the above-described procedure.

On the other hand, the following describes the encoding process of the vocoder DSP module in the IMT-2000 control station system according to an embodiment of the present invention.

First, when the four DSPs 200 receive the PCM voice data transmitted from the switching center 1 through the ST bus, they are compressed in 20 ms units and then stored in the two 16-bit DP RAMs 101. .

Thereafter, the four DSPs 200 generate read interrupts to the selector board interface 300.

Then, after the selector board interface unit 300 receives a read interrupt from the corresponding DSP 200, the selector board interface unit 300 reads PCM voice data stored in the two 16-bit DP RAMs 101 to the base station 2. send.

Here, the above-described encoding process continues repeatedly.

In addition, the following describes the decoding process of the vocoder DSP module in the IMT-2000 control station system according to an embodiment of the present invention.

First, when the selector board interface unit 300 receives the PCM voice data compressed in the packet unit from the base station 2, the selector board interface unit 300 stores the selected PCM voice data in the corresponding regions of the two 16-bit DP RAMs 101.

Thereafter, the selector board interface unit 300 generates a read interrupt to the corresponding DSP 200 among the four DSPs 200.

Then, the DSP 200 receives the read interrupt from the selector board interface unit 300 and then reads the PCM voice data stored in the two 16-bit DP RAMs 101.

The DSP 200 then decodes the PCM voice data and transmits it to the switching center 1 via the ST bus.

Here, the above-described decoding process continues repeatedly.

On the other hand, the following describes the debugging process of the vocoder DSP module in the IMT-2000 control station system according to an embodiment of the present invention.

First, the operator outputs a debugging control signal to the JTAG header unit 700 through the operator terminal (3).

Then, the JTAG header unit 700 transmits the debugging control signal to the four DSPs 200.

Subsequently, the four DSPs 200 receive a debugging control signal from the JTAG header unit 700, and then grasp their current state and output the state information to the JTAG header unit 700, respectively. .

Then, the JTAG header unit 700 receives the respective DSP status information received from the four DSP 200, and transmits it to the operator terminal (3).

Subsequently, the operator terminal 3 receives the state information of the four DSPs 200 from the JTAG header unit 700 and then displays the information to the operator.

On the other hand, by using the above-described JTAG header unit 700, the operator can directly perform the boot code and AMR codec code downloading process of the four DSP (200).

As described above, according to the Vocoder DSP module in the mobile communication system according to the present invention, it is possible to download a boot program and an AMR codec program to four DSP cores with only one flash memory, thereby making the internal of the Vocoder DSP module possible. The simplified configuration not only simplifies system design, but also lowers the cost of design and implementation. It also has the added benefit of accommodating more subscribers than the number of DSP cores with built-in flash memory.

Claims (4)

A DP RAM unit performing DP RAM communication of PCM voice data in a compressed packet unit; When receiving the PCM voice data from the switching center, the packet is compressed in a predetermined time packet unit and stored in the corresponding area of the DP RAM unit, and a read interrupt is generated. When the read interrupt is input, the PCM voice data stored in the DP RAM unit is read. A plurality of DSPs which are then decoded and transmitted to the switching center; When receiving the compressed PCM voice data in the unit of packet from the base station is stored in the corresponding area of the DP RAM unit and outputs a read interrupt to the plurality of DSPs, while receiving a read interrupt from the corresponding DSP stored in the DP RAM unit A selector board interface unit which reads PCM voice data and transmits the same to the base station; A flash memory connected to signal inputs of the plurality of DSPs and storing a boot code and a voice codec code; A PLD logic unit configured to sequentially load boot codes and voice codec codes stored in the flash memory into the plurality of DSPs when the plurality of DSPs are powered on or reset; And DSP module for a vocoder in a mobile communication system, characterized in that consisting of a power supply for supplying a constant power to the DP RAM unit, a plurality of DSP, selector board interface unit, flash memory, and PLD logic unit. The method of claim 1, And the DP RAM unit comprises two 16-bit DP RAMs for storing PCM voice data compressed in 32-bit packet units. The method of claim 1, The voice codec code stored in the flash memory is an AMR voice codec code, vocoder DSP module for a mobile communication system. The method of claim 1, The input / output terminals of the plurality of DSPs further include a JTAG header unit configured to perform the plurality of DSP debugging processing operations and the sequential boot code and voice codec code downloading processing to the plurality of DSPs under the control of an operator terminal. Vocoder DSP module for mobile communication systems.