JP2866836B2 - Communication device and communication method for digital mobile communication exchange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a PCM (Pulse Cod
e Modulation) A communication device and a communication method of a digital mobile communication exchange having the same data sampling number, particularly a PCM (pulse code modulation method) signal used in a communication device of a digital mobile communication exchange, R2MFC (R2 Multi-fr) for signal transmission
equency Compelled: Signal system between stations, DTMF (Dual Tone Multi-frequency) signal for push button subscribers, continuity to check whether the communication path between exchanges is normal Test sound CCT (Continu
(digital tone) signal and the number of samples of audible tone signals for notifying the call connection and processing status of the exchange and the like, so that the circuit is simplified. And a communication method.

[0002]

2. Description of the Related Art FIG. 3 shows a block diagram of a PCM data transmitting section of a communication device of a conventional digital mobile communication exchange. S-RAM (Static Random Access Memory) 1 for temporarily storing channel information and signal digit information input from the microcontroller 4 through a latch
And an EP-RO connected to the S-RAM 1 for storing sampled signal data such as an audible signal, an R2MFC signal, a DTMF signal, and a continuity test signal converted into a PCM.
An E / M (Erasable Programmable Read Only Memory) 2; a parallel / serial converter 3 for converting the parallel data of the EP-ROM 2 into serial data and outputting the serial data to a time switch device (not shown) through a sub-highway interface unit 8; A PCM data output control unit 5 for controlling the controller 4 and controlling the output of the PCM data by the clock signal from the sub-highway interface unit 8;
It comprises a counter circuit section 6 for counting a clock signal to provide an address to the P-ROM 2, and a clock frequency dividing circuit section 7 for applying a frequency-divided clock to the parallel / serial converting section 3 and the counter circuit section 6.

FIG. 4 is a memory map of the conventional PCM data stored in the EP-ROM 2. As shown in the figure, the memory map of the PCM signal data stored in the EP-ROM 2 includes an audible tone signal tone area, R2MFC.
The area is divided into a forward area, an R2MFC rear area, a DTMF signal area, and a CCT signal area. In accordance with the time slot information and signal information received from the microcontroller 4, data stored in a memory map position corresponding to PCM signal data specified for each time slot is generated from a memory using a look-up table method and time is used. Send to the switch device. For this purpose, the EP-ROM 2 divides the pages of the memory, and generates a signal tone by repeatedly reading the number of samples of the selected page as the lower address while repeating the reading, but R2MFC / DTMF / CCT.
400 bytes for signal, 204 for audible tone
8-byte sample data is used. At this time, the upper address is designated by the microcontroller 4 as S-RA.
The information of the signal for each time slot written in M1 is used, and the lower-order address is generated by the counter circuit 6 as many as the number corresponding to the number of samples.

On the other hand, zero signal data having no signal frequency and no signal sound include an audible signal sound, an R2MFC rear signal, and an R2M signal.
Since the signal information is stored in each area of the FC forward signal and the CCT signal, when the signal information is continuously transmitted, the signal information is used as a division display between the signal information under the control of the microcontroller 4. Is DT
Since there are 16 types of MF signals, zero signal data is not stored. When using zero signal data, R2MF
The zero signal in the C forward region is used.

[0005]

In the communication apparatus of the conventional digital mobile communication exchange constructed as described above, R
Since the sampling numbers of the 2MFC signal, the DTMF signal, the CCT signal, and the PCM data of the audible tone signal are respectively 400 bytes and 2048 bytes, respectively,
When the PCM data output control unit 5 is separately required, the hardware and software of the communication device become complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a communication apparatus and a communication method of a digital mobile communication exchange which have solved the above-mentioned problems by making the sampling numbers of PCM data the same. The purpose is to:

[0007]

SUMMARY OF THE INVENTION In view of the above-mentioned object, the present invention stores a sampled signal data of an audible signal sound, an R2MFC signal, a DTMF signal and a CCT signal sound which are connected to a microcontroller and converted into PCM. E
A P-ROM memory unit, a parallel / serial conversion unit for converting parallel data in the EP-ROM memory unit to serial data and sending the serial data to the sub-highway interface unit;
A counter circuit for counting a clock signal for providing an address to the M memory unit; and a clock divider circuit unit for applying a divided clock to the counter circuit unit by a clock signal from the sub-highway interface unit. And PCM data having the same sampling number.

Further, the present invention further provides a digital mobile communication exchange for communicating a multi-frequency signal R2MFC / multi-tone multi-frequency DTMF / continuous test tone CCT and PCM data of an audible tone signal from a digital mobile communication exchange. The PCM data sampling number is the same, the optimum PCM data is stored in the memory unit and the R2MFC /
The present invention also includes a communication method of a digital mobile communication exchange characterized by simultaneously providing DTMF / CCT and tone functions.

According to the present invention, since the sampling number of PCM data is made the same, the signal processing audible tone of the communication device of the mobile communication exchange can be multiplexed.
By eliminating the need for the N + 1 additional mode in the OM,
Software control is simplified, hardware configuration and logic are simplified, and R2M
FC / DTMF / CCT and tone functions can be provided simultaneously, which allows for increased device reliability and performance.

That is, the present invention relates to R2MFC / DTM.
By making the number of samples of the F / CCT signal and that of the audible tone signal the same, the optimum PCM data
(Synthetic frequency), and the sub-highway for R2MFC / DTMF / CCT signal communication and the sub-highway for audible tone PCM data communication are separately designed, eliminating the need for a PCM data output control circuit, and designing hardware and software programs. This PCM coding technique can be widely used not only in exchanges but also in other fields, and can be applied to speech synthesis.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description will be given with reference to the accompanying drawings. FIG. 1 is a block diagram of a PCM data transmitting unit of a communication device of a digital mobile communication exchange according to an embodiment of the present invention. As shown in the figure, a microcontroller 4 and an audible signal sound, an R2MFC signal, a DTM
EP-ROM memory unit 20 for storing sampled signal data such as F signal and CCT signal which is a continuity signal
A parallel / serial conversion unit 3 for converting the parallel data of the EP-ROM memory unit 20 into serial data and sending the serial data to the sub-highway interface unit 8;
Circuit section 6 for counting clock signals to provide an address to sub-highway interface section 8
And a sub-highway interface section 8 for applying a frequency-divided clock to the counter circuit section 6 in response to a clock signal from

[0014] 204 of the counter circuit unit 6 of the signal sound transmission unit
An 8-up counter (not shown) increases the counter output every frame, but this is a signal storage EP-ROM.
11 bits of the lower address of the signal storage EP
-The most significant 1 bit of the upper 7 bits of the ROM is U-law (North American coding system) / A-law.
(European coding system) The area is divided into two parts, and the remaining 6 bits are
The 1-byte parallel PCM data output from the EP-ROM memory unit 20, designated as signal tone block information every 25/64 μsec, is converted to serial data by the parallel / serial conversion unit 3 and
And sent to a time switch device (not shown).

The microcontroller 4 uses the 8 KHz signal of the sub-highway interface section 8 as an interrupt source of a counter to generate an interrupt signal every 25 ms to control the intermittent ratio of the audible signal sound. Highway interrupt part 8 is R2MF
Sub-highways for C / DTMF / CCT and audible tones are separated, and a service of 32 channel capacity can be provided for each sub-highway.

FIG. 2 is a memory map diagram of the EP-ROM memory unit 20 according to the present invention. The EP-ROM memory unit 20 has a total capacity of 256 Kbytes, and is divided into U-laws (North American coding system) / A divided into 128 Kbytes. U-law in the -law (European coding scheme) domain
3 illustrates a memory map of PCM data. As can be seen from the figure, one PCM data is set to 2048 bytes, and the number of samples of the PCM data of the R2MFC / DTMF / CCT signal and the audible tone signal is set so that the most suitable PCM data can be searched from the same 2048 bytes. Each was embodied by the optimal composite frequency.

[0015]

As described above, according to the present invention, R2MFC /
By embodying the DTMF / CCT signal and the PCM data of the audible tone signal by using the same number of samples, the R2MFC / DTMF / CCT service and the tone service additionally require a counter circuit unit. The EP-RO eliminates the need for hardware logic and its configuration, and can multiplex audible tones for signal processing of the communication device of the mobile communication exchange.
By eliminating the need for the N + 1 additional mode in M, P
Since the CM data output control unit can be eliminated, software control is simplified, and all functions of R2MFC / DTMF / CCT and tone can be simultaneously provided on one type of board. As a result, the effect of improving the reliability and performance of the device can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a PCM data transmitting unit of a communication device of a digital mobile communication exchange according to an embodiment of the present invention.

FIG. 2 is a memory map diagram of PCM data in an EP-ROM memory unit in FIG. 2;

FIG. 3 is a block diagram of a PCM data transmission unit of a communication device of a conventional digital mobile communication exchange.

FIG. 4 is a memory map of PCM data of the EP-ROM of FIG. 3;

[Explanation of symbols]

3 parallel / serial converter, 4 microcontroller, 6
A counter circuit section, a 7-clock dividing circuit section, an 8 sub-highway interface section, and a 20 EP-ROM memory section.

────────────────────────────────────────────────── (5) References JP-A-63-207265 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04Q 1/45 H04M 19/02

Claims (2)

(57) [Claims] 1. A PC connected to a microcontroller
An EP-ROM memory unit for storing sampled signal data of the audible signal sound, the R2MFC signal, the DTMF signal and the CCT signal sound which have been converted into M; Parallel sent to interface /
A serial converter, a counter circuit for counting a clock signal to provide an address to the EP-ROM memory unit, and a clock for applying a divided clock to the counter circuit unit by a clock signal from the sub-highway interface unit. A communication device for a digital mobile communication exchange, comprising: a frequency divider circuit; and a PCM data sampling number equalized. 2. A multi-frequency DTMF of a multi-frequency signal R2 MFC / dual tone from a digital mobile communication exchange to an office.
/ Continuity test tone CCT and audible tone signal PCM
A communication method of a digital mobile communication exchange for communicating data, in which sampling numbers of PCM data are made the same, optimal PCM data based on the sampling number is stored in a memory unit, and R2MFC / DTMF / CCT,
A communication method for a digital mobile communication exchange, wherein a tone function is provided at the same time.