KR100264039B1 - Pcm data communication unit of digital mobile communication exchange sampling number regard - Google Patents

Abstract

PURPOSE: An apparatus for transmitting PCM data of a digital mobile communication exchanger is provided to multiply the signal processing audio tone of the digital mobile communication exchanger signal device by equalizing the number of sampling of PCM data, to simplify the structure of a hardware and the control of a software by removing the PCM data output control circuit, and to enhance the reliability and performance of the system by enabling a kine of board to provide with R2 MFC/DTMF/CCT, tone functions. CONSTITUTION: The apparatus for transmitting PCM data of a digital mobile communication exchanger having an equalized sampling number includes an EP-ROM memory (2') for receiving a control signal from a microcontroller(4) and selectively outputting the sampled PCM signal data such as the ready-stored same R2MFC signal, DTMF signal and constant test sound as well as outputting an audio tone signal sound as same as the R2MFC signal, DTMF signal and constant test sound according to the pre-set time; a parallel/serial converter(3) for receiving the parallel data output from the memory part(2'), converting it into a serial data and outputting it to a sub-high way interface part(8); a single counter circuit part(6') for counting clock signals to provide an address for outputting the R2MFC/DTMF/CCT and audio tone signal sound stored in the EP-ROM memory part (2'); and a clock demultiply circuit part(7) for supplying a demultiplied clock to the parallel/serial converter(3) and the counter circuit part(6') according to the clock signal output from the sub-highway interface part (8).

Description

PCM data transmission device of digital mobile communication switch with the same number of samplings

1 is a block diagram showing a PCM data transmission apparatus of a conventional digital mobile communication switch.

2 is a block diagram showing a map of an EP-ROM memory in which PCM data is incorporated in a PCM data transmission apparatus of a conventional digital mobile communication exchange.

3 is a block diagram showing a signal device block in which a PCM data transmission device of a conventional digital mobile communication switch is implemented.

4 is a block diagram showing a PCM data transmission apparatus of a digital mobile communication switch in which sampling numbers are equalized according to an embodiment of the present invention.

FIG. 5 is a block diagram showing a map of an EP-ROM memory in which PCM data is embedded in a PCM data transmission apparatus of a digital mobile communication switch having the same number of sampling according to an embodiment of the present invention.

FIG. 6 is a block diagram showing a signal device block in which a transmitter of a digital mobile communication switch in which sampling numbers are equalized according to an embodiment of the present invention is devised.

* Explanation of symbols for main parts of the drawings

2 ′: EP-ROM 3: Parallel / serial converter

4: microcontroller 6 ′: counter circuit

7: Clock division circuit unit 8: Sub-highway interface unit

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a digital mobile communication switch signaling apparatus having the same number of PCM data sampling numbers, and more particularly, to a PCM (PULSE CODE MOOULATION) signal used in a digital mobile communication exchange signaling apparatus. R2 MFC (R2 MULTIFREQUENCY COMPELLED: Signaling between stations; hereinafter referred to as R2 MFC) signal for exchange between exchanges, and DTMF of dual pushbutton subscribers Continuity test tone (CCT: CONTINUITY CHECK TONE; hereinafter referred to as CCT) to confirm the normality of signal and communication channel (AUDIBLE TONE). .) Digital PC of digital mobile communication exchange which equalizes the number of sampling which makes it possible to implement the circuit of PCM data transmission device by the same number of sampling of signal. M data transmission apparatus.

A block diagram of a PCM data transmission apparatus of a conventional digital mobile telecommunication switch is shown in FIG. 1 as shown in FIG. 1 to temporarily store channel information and signal digit information input from a microcontroller 4 via a latch (not shown). STATIC RANDOM ACCESS MEMORY 1; EP-ROM (ERASABLE PROGRAMM-ABLEREAD ONLY MEMORY), which is connected to the S-RAM 1 and stores binaryly sampled signal data such as PCM-audible audible tones, R2MFC signals, DTMF signals and CCT test sounds. )and; A parallel / serial converter (3) for converting the parallel data of the EP-ROM (2) into serial and outputting the serial data through a sub-highway interface (8) to a time switch device (not shown); A PCM data output control unit 5 for controlling the output of the PCMized data according to the control of the microcontroller 4 and the clock signal output from the sub-highway interface unit 8; and an address in the EP-ROM 2; A counter circuit section (6) for selectively counting clock signals for R2MFC / DTMF / CCT or audible tones in accordance with the control signal output from the PCM output control section (5) to provide a? The parallel / serial converting section 3 and the clock divider section 7 are provided to apply a divided clock to the counter circuit section 6.

On the other hand, as can be seen in FIG. 2, the memory map of the beep PCM data stored in the EP-ROM 2 includes an audible tone tone region, an R2 MFC front region, an R2 MFC back region, and a DTMF. The data is divided into a signal area and a CCT signal area, and the data stored in the memory map corresponding to the PCM signal data designated for each time slot according to the time slot information and the signal information received from the microcontroller 4 are looked up in a table. Using the method, it is generated from the memory and sent to the time switch device.

To this end, the EP-ROM 2 distinguishes memory pages and repeatedly reads the number of samplings of the selected page as a lower address, and generates a beep sound. The R2MFC / DTMF / CCT signal is 400 bytes, and the audible tone is The case uses binary sample data of 2048 bytes.

At this time, the upper address uses signal information for each time slot written from the microcontroller 4 to the S-RAM 1, and the lower address generates an address corresponding to the number of samplings by the counter circuit unit 6.

On the other hand, zero signal data having no signal frequency and no beep sound is embedded in the audible beep sound, R2MFC rear signal, R2MFC front signal and CCT signal area, respectively. It is used under the control of the microcontroller 4, and since there are 16 types of DTMF signals in the DTMF signal area, zero signal data is not built-in, and zero signals embedded in the R2 MFC front area are used when zero signal data is used. do.

3 is a block diagram illustrating a signal device block in which a PCM data transmission device of a conventional digital mobile communication switch is implemented, and a plurality of RDC boards for transmitting / receiving R2MFC / DTMF / CCT signals (for example, 10) On the other hand, it can be seen that a tone board for transmitting an audible tone signal and a spare board (SPARE board), which is used when an error occurs in the tone board, are additionally mounted.

However, the PCM data transmitter of the conventional digital mobile communication switch requires a PCM data output control unit separately because the number of PCM data sampling of the R2MFC signal, DTMF signal, CCT signal and audible tone signal is 400 bytes and 2048 bytes, respectively. In addition, since the counter circuit unit selectively counts the sampling number to 400 bytes or 2048 bytes according to the control signal output from the PCM data output controller, the hardware and software of the signal device are complicated.

In addition, since the PCM data stored in the EP-ROM are different from each other in 400 bytes and 2048 bytes, a board for outputting R2MFC / DTMF / CCT tones and a board for outputting audible tone signals are separately provided for redundancy. SPARE) is required.

Accordingly, the present invention is to solve the above problems, by realizing the PCM data sampling number of the R2MFC / DTMF / CCT signal and the audible tone signal equal to the PCM data (synthesis frequency), R2MFC / DTMF / The CCT signal transmission sub-highway and audible tone PCM data transmission sub-highway are designed to be fixed separately, and the PCM data transmission control circuit can be eliminated to simplify the configuration and logic of the counter circuit section, simplifying hardware design and software implementation. It would be.

In addition, the present invention can multiplex the signal processing audible tone of the mobile communication exchange signaling device by making the same number of sampling of PCM data, so that a redundant board (SPARE board) is not necessary, so that R2MFC / DTMF / CCT, The present invention provides a PCM data transmission device of a digital mobile switching center that has the same number of samples to be able to simultaneously service an audible tone function, thereby improving reliability and performance in the system.

In order to achieve the above object, the PCM data transmission apparatus of the digital mobile communication switch having the same number of samplings of the present invention receives the control signals output from the microcontroller 4, and stores the same R2MFC signal, DTMF signal, and the like. EP-ROM memory section 2 'that selectively outputs sampled PCM signal data such as CCT test tones and outputs the same audible tone signal as the R2MFC signal, DTMF signal and CCT test tones according to a preset time. And a parallel / serial conversion section 3 for receiving the parallel data output from the EP-ROM memory section 2 'and converting the serial data into serial data and outputting the serial data to the sub-highway interface section 8; A single counter circuit section 6'counting a clock signal to provide an address for outputting an R2MFC / DTMF / CCT and an audible tone beep stored in the memory section 2 '; And a clock divider circuit 7 for supplying a divided clock to the parallel / serial converter 3 and the counter circuit 6 'according to the clock signal output from the sub-highway interface 8. .

Hereinafter, a PCM data transmission apparatus of a digital mobile communication switch having the same number of samplings according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram showing a PCM data transmitter of a digital mobile telecommunication switch with the same number of samplings. FIG. 5 is a block diagram of an EP-ROM memory in which PCM data is stored in a PCM data transmitter of a digital mobile telecommunication switch with the same number of samplings. It is a block diagram showing a map.

6 is a block diagram showing a signal device block in which a PCM data transmission device of a digital mobile communication switch having the same number of samplings is implemented.

As shown in FIG. 4, first, the EP-ROM memory unit 2 'receives a control signal output from the microcontroller 4, and stores R2 MFC signals, DTMF signals, and CCT tests stored in advance. It selectively outputs sampled PCM signal data such as sound, and outputs an audible signal sound according to a preset time.

In addition, the parallel / serial converter 3 receives parallel data output from the EP-ROM memory unit 2 ′, converts the parallel data into serial data, and outputs the serial data to the sub-highway interface unit 8.

The counter circuit section 6 'then counts the same clock signal to provide an address for outputting R2MFC / DTMF / CCT and audible tone tones stored in the EP-ROM memory section 2' with the same number of samples. The clock division circuit unit 7 supplies a divided clock to the parallel / serial conversion unit 3 and the counter circuit unit 6 'according to the clock signal output from the sub-highway interface unit 8. Play a role.

Hereinafter, an operation process of the PCM data transmission apparatus of the digital mobile communication exchange in which the sampling numbers configured as described above are equalized will be described below.

When the control signal output from the upper processor (not shown) is received by the microcontroller 4 and outputs a control signal corresponding thereto, the control signal output from the microcontroller 4 in the EP-ROM memory unit 2 '. As shown in FIG. 5, the PCM signal data stored in advance, that is, sampled signal data such as R2MFC signal, DTMF signal, and CCT test tone are selectively output, and the audible signal tone is preset. Output uniformly over time.

In addition, the parallel / serial converter 3 receives the parallel signal data output from the EP-ROM memory unit 2 ′ and converts the parallel signal data into serial signal data so as to be input by a time switch device (not shown). The conversion is output to the sub-highway interface unit 8.

At this time, the counter circuit section 6 'has the same address so as to output the R2MFC / DTMF / CCT and audible tone tones stored in the EP-ROM memory section 2' by the control signal of the microcontroller 4. For example, the clock signal for providing a sampling number of 2048 bytes is counted.

That is, the counter circuit 6 'increments the counter output every frame, which designates 11 bits of the lower address of the EP-ROM memory unit 2' which stores the signal data, and among 7 bits of the upper address. The most significant 1 bit is divided into u-law (North American coding system) / A-law (European coding system) area, and the remaining 6 bits are beep block information for every 125/64 usec from the EP-ROM memory unit 2 '. Specify with.

In addition, the microcontroller 4 generates an interrupt every 25ms by using the 8KHz signal of the sub-highway interface unit 8 as a counter interrupt source, thereby controlling the interruption ratio of the audible beep, so that the sub-highway interface unit 8 The R2 MFC / DTMF / CCT and sub-highway for audible tones are separated and fixed, enabling 32 channels of capacity service for each sub-highway.

On the other hand, the clock division circuit unit 7 receives the clock signal output from the sub-highway interface unit 8 and divides the divided clock according to the clock signal to the parallel / serial conversion unit 3 and the counter circuit unit 6 '. Supply it.

5 is a memory map of the EP-ROM memory unit 2 'according to the present invention. The u-law (North American coding method) / A-law (which has a total capacity of 256K bytes and is bisected by 128K bytes) is shown in FIG. U-law PCM data memory map of the European coding scheme) is shown.

That is, one PCM data is 2048 bytes, and each PCM data sampling number of the R2MFC / DTMF / CCT signal and the audible tone signal is implemented at the optimal synthesis frequency so that the most optimal PCM data can be found in the same 2048 bytes.

Meanwhile, as shown in FIG. 6, R2MFC / DTMF / CCT and audible tone signal data are shown in the configuration of the signal device block in which the PCM data transmission device of the digital mobile communication switch having the same number of samplings as described above is implemented. It can be done on one board, so no independent tone boards and redundant boards (SPARE boards) are included.

As described above, the PCM data transmission apparatus of the digital mobile communication exchange in which the sampling number of the present invention is equalized. By implementing the PCM data of the R2MFC / DTMF / CCT signal and the audible tone signal at the same sampling rate, the PCM data output control part becomes unnecessary, and thus, in the case of R2MFC / DTMF / CCT or audible tone signal service, the counter circuit part additionally While the necessary hardware logic and configuration are not necessary, the multiplexing of the signal processing audible tones of the mobile switching device signal device can be multiplexed, thus eliminating the need for a tone board and a redundant board, which simplifies the control of the software, and the R2MFC / DTMF on one board. / CCT and audible tone function can all be serviced at the same time, improving the reliability and performance of the system.

Claims (1)

Receives a control signal output from the microcontroller 4 and selectively outputs sampled PCM signal data such as the same pre-stored R2MFC signal, DTMF signal, and continuity test tone, and the R2MFC signal according to a preset time. And an EP-ROM memory section 2 'which outputs an audible tone signal identical to the DTMF signal and the continuity test tone; A parallel / serial converter (3) which receives the parallel data output from the EP-ROM memory section (2 '), converts the serial data into serial data, and outputs the serial data to the sub-highway interface section (8); A single counter circuit section 6'counting a clock signal to provide an address for outputting the R2MFC / DTMF / CCT and audible tone tones stored in the EP-ROM memory section 2 '; And a clock divider circuit section 7 for supplying a divided clock to the history / serial converting section 3 and the counter circuit section 6 'according to the clock signal output from the sub-highway interface section 8. PCM data transmission device of a digital mobile communication switch with the same number of samplings.