KR0147271B1 - Private exchanger - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a North American and European method of converting a voice signal, and more particularly, to a method of converting a voice signal suitable for a digital trunk interface.

The voice signal converting apparatus of the private exchange according to the present invention is different from the conventional method in which the type of the private exchange is determined by the trunk type (North American or European) of the other station, regardless of the trunk type of the other station. North America or Europe), and within the private exchange, it is possible to simultaneously connect with the counterpart with the North American trunk as well as the counterpart with the European trunk. Alternatively, there is an effect that the coding schemes of both exchanges can be matched without using existing conversion equipment to match the coding schemes of both exchanges.

Description

Voice signal converter of private exchange

1 is a simplified configuration diagram of a voice signal conversion apparatus of a conventional private exchange.

2 is a block diagram of a voice signal conversion apparatus of a private switch according to the present invention.

3 is an operation timing diagram of the voice signal conversion apparatus shown in FIG.

* Explanation of symbols for main parts of the drawings

1: private exchange 100: digital trunk interface circuit

200: digital switching circuit 300: converter

10: system control unit 11: microprocessor

12: address decoder 13: D flip-flop

20: input data converter 30: output data converter

21A, 21B, 31A, 31B: Shift Register

22A, 22B, 32A, 32B: Latch 23, 33: PROM

40: Digital switching circuit part 50: Data transmission path opening and shutting part

51: digital trunk interface unit

52A, 52B, 53A, 53B: Three Staple Buffers

54: inverter

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a North American and European method of converting a voice signal, and more particularly, to a method of converting a voice signal suitable for a digital trunk interface.

In general, in international communication, devices or methods that match each method should be provided when the communication methods are different. For example, since the North American method and the European method of the telephone call device have a remarkable difference, as shown in FIG. 1, a T-Tira trunk interface circuit part 100, a digital switching circuit part 200, and the like, which transmit and receive to a counterpart station, are included. The private exchange 1 and the conversion device 300 for converting the digital coding into the North American system to the European system between the private exchange 1 and the local exchange were to be provided.

A brief description of the operation of the prior art configured as shown in FIG. 1 is as follows.

The digital switching interface 200 directly connects the signal (only the voice) received from the counterpart station to the extension subscriber in the digital switching circuit unit 200 to make a call with the subscriber of the counterpart station. At this time, if the other country's currency method is different from the domestic one, only normal North American-European exchanges (one device) could be used between the other country and the private exchange.

Therefore, in the above-described prior art, the private bridge is operated in the North American or European manner depending on whether the counterpart's digital trunk is North American or European. Therefore, before installing the private exchange, the digital trunk type of the counterpart is first selected. In consideration of this, the inconvenience of having to decide the type of private exchange (North American or European) according to this problem has been presented as a problem. Also, when the digital coding scheme is different, both exchangers are used by using the converter 300 between the private exchange and the local exchange. The inconvenience of having to match the coding scheme between them has been presented as a problem.

An object of the present invention for solving the problems of the prior art as described above is a voice signal conversion device of a private exchange that can be automatically converted by adding a function to determine the North American or European method to the voice conversion device in the private exchange. To provide.

A feature of the present invention for achieving the above object is a system for generating a control signal for opening and closing an input / output data transmission path by detecting the format of input / output data in the voice signal conversion apparatus of a private exchange. A controller 10; A data transmission path opening and closing unit 50 for opening and closing a connection to an input / output data transmission path to a trunk line subscriber according to a control signal of the system control unit 10; An input data conversion unit (20) for converting the trunk line side data applied from the data transmission line opening / closing unit (50) through the input data transmission line to the station side data by another coding scheme; Transmitting the data received from the input data conversion unit 20 and the data transmission path opening and closing unit 50 to the subscribers, and receives the transmission data of the extension subscribers, the data transmission path opening and closing unit 50 and the output data conversion described later A digital switching circuit section 40 output to the section 30 side; Output data conversion unit 30 for converting the transmission data of the extension subscriber received through the digital switching circuit unit 40 to the trunk line-side data of the other coding scheme to be transmitted to the data transmission path opening and closing unit 50 through the output data transmission path ) Is provided.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram of a voice signal conversion apparatus of a private switching system according to the present invention, which includes a system control unit 10, an input data conversion unit 20, an output data conversion unit 30, a digital switching circuit unit 40, and data. The transmission path opening and closing part 50 is provided. The system control unit 10 is responsible for the overall system control and detects the format of the input and output data to generate a control signal for opening and closing the input and output data transmission path, the data transmission path opening and closing unit 50 is the control of the system control unit 10 According to the signal, the input / output data transmission line connection to the trunk line is opened and closed, and the input data conversion unit 20 transfers the data of the trunk line side applied from the data transmission line opening / closing unit 50 through the input data transmission line to another coding scheme. Convert to ext. Side data. The digital switching circuit 40 transmits data received from the input data converting unit 20 and the data transmission line opening and closing unit 50 to the subscriber, and receives the transmission data of the extension subscriber to receive the output data converting unit. Output to the 30 and the data transmission path opening and closing part 50 side. In addition, the output data conversion unit 30 converts the transmission data of the extension subscribers received through the digital switching circuit unit 40 into the trunk line side data of another coding scheme and converts the data transmission path opening and closing unit 50 through the output data transmission path. To send).

Looking at the detailed configuration of each configuration, the system control unit 10 is configured with a microprocessor 11, an address decoder 12 and a D flip-flop (13). The microprocessor 11 performs system-wide control and checks the transmission data input / output method, and outputs a conversion control signal to the D flip-flop 13 side. The address decoder 12 transmits the microprocessor 11 to the microprocessor 11. Connected to decode the address and output an address enable signal to the D flip-flop 13 side. The D flip-flop 13 receives a conversion control signal output from the microprocessor 11 to the data input terminal D. The address enable signal of the address decoder 12 is applied as a clock signal and operated to output a signal through the first and second output terminals Q and (/ Q).

In addition, the data transmission path opening and closing unit 50 may include a digital trunk interface unit 51, a first three state buffer 52A, a second three state buffer 53A, a third three state buffer 52B, and a fourth three state. It is comprised with the buffer 53B. The digital trunk interface unit 51 inputs and outputs data to and from the trunk line, and the first three state buffer 52A is connected to the second output terminal (/ Q) of the D flip-flop 13 included in the system control unit 10. In response to the output signal, the data from the digital trunk interface unit 51 is applied to the input data converter 20. The second three state buffer 53A applies data from the digital trunk interface unit 51 in accordance with an output signal by the first output terminal Q of the D flip-flop 13 included in the system control unit 10. Is applied to the digital switching circuit 40, and the third three state buffer 52B is in response to an output signal from the second output terminal (/ Q) of the D flip-flop 13 included in the system controller 10. The data from the output data conversion unit 30 is received and applied to the digital trunk interface unit 51, and the fourth three state buffer 53B is a D flip-flop 13 provided in the system control unit 10. The data from the digital switching circuit unit 40 is applied to the digital trunk interface unit 51 according to the output signal of the first output terminal Q.

In addition, the input data converter 20 includes a first shift register 21A, a first latch 22A, a first PROM 23, a second latch 22B, and a second shift register 21B. . The first shift register 21A receives serial data from the first three state buffers 52A of the data transmission path opening and closing unit 50 and converts the data into serial data, and the first latch 22A converts the data into parallel data. The data from the one shift register 21A is received, and the first PROM 23 receives the data from the first latch 22A and converts the data into the extension data of another coding scheme. The second latch 22B receives the data of the first PROM 23, and the second shift register 21B converts the data of the parallel format applied from the second latch 22B into serial data.

In addition, the output data converter 30 includes a third shift register 31A, a third latch 32A, a second PROM 33, a fourth latch 32B, and a fourth shift register 31B. do. The third shift register 31A receives serial data from the digital switching circuit 40 and converts the data into parallel data, and the third latch 32A converts the data from the third shift register 31A. The second PROM 33 receives the data from the third latch 32A, converts the data into trunk line data of another coding scheme, and outputs the converted data. In addition, the fourth latch 32B receives the data from the second PROM 33, and the fourth shift register 31B converts the parallel type data received from the fourth latch 32B into serial data. The conversion is applied to the third three state buffer 52B of the data transmission path opening and closing section 50.

In addition, the respective components of the input / output data conversion unit 20 and 30 and the digital switching circuit unit 40 configured as described above operate according to the following clock signals. The first and third latches 22A 32A operates in synchronization with the first latch clock signal / AL, and the second and fourth latches 22B and 32B operate in synchronization with the second latch clock signal / BL. The third syst registers 21A and 31A operate in synchronization with the output signal of the inverter 54 which receives a clock signal (/ D ₂ MHz) of a predetermined frequency. In addition, the second and fourth shift registers 21B and 31B and the digital switching circuit 40 operate in synchronization with a clock signal (2 MHz) of a predetermined frequency.

A detailed operation example of the voice signal conversion apparatus configured as described above will be described in detail with reference to FIG.

The digital trunk interface unit 51 selects only the audio signal from the digital signals received from the partner station and outputs the voice signal to the input data transmission path. At this time, the D flip-flop 13 outputs the voice output to the input data transmission path by the digital trunk interface unit 51 according to the conversion control signal from the microprocessor 11 and the address enable signal from the address decoder 12. You decide whether to convert the data to North American to European or directly.

When the conversion from the North American method to the European method is required, the D flip-flop 13 sets the output signal of the first output terminal Q to a low level to turn off the second three state buffer 53A so that voice data is immediately available. By preventing the digital switching circuit 40 from being applied to the digital switching circuit 40 through the input data transmission path and turning on the first three state buffer 52A by setting the output signal of the second output terminal / Q to a high level, the digital trunk interface The serial-type voice data applied from the unit 51 is input to the first shift register 21A through the first three state buffer 52A, changed in parallel, and then the first PROM 23 through the first latch 22A. ) As an address.

At this time, the North American system-European conversion data is programmed in the first PROM 23, and the parallel voice data applied from the first latch 22A is taken as an address and converted into the North American-European system stored at the corresponding address. The voice data of the trunk line is converted into the station-side data of another coding scheme by outputting corresponding data. In this way, the parallel data output from the first PROM 23 is applied to the second shift register 21B via the second latch 22B, converted into a serial format, and applied to the digital switching circuit unit 40.

The digital switching circuit unit 40 transmits the data input from the second shift register 21B to the subscribers of the station, and is applied to the digital trunk interface unit 51 to receive the transmission data of the subscribers and transmit the data to the subscribers. The D flip-flop 13 outputs voice data output from the digital switching circuit 51 to the output data transmission path in accordance with the conversion control signal from the microprocessor 11 and the address enable signal from the address decoder 12. It is decided whether or not to convert the data into North American ↔ European Ice or directly.

When the conversion from the North American method to the European method is required, the D flip-flop 13 low-levels the output signal of the first output terminal Q, turns off the four-state buffer 53B, and immediately outputs audio data. The digital switching circuit unit is turned on by turning on the third three state buffer 52B by preventing the digital trunk interface unit 51 from being applied to the digital trunk interface unit 51 through the data transmission path and setting the output signal of the second output terminal / Q to a high level. The data outputted from the 40 is converted to the trunk line side data of another coding scheme by the output data conversion section 30 and then applied to the digital trunk interface section 51 through the third three state buffer 52B.

At this time, the serial voice data applied from the digital switching circuit unit 40 to the third shift register 31A is converted into parallel data in the third shift register 31A, and the second PROM is transferred through the third latch 32A. The second PROM 33 receives the parallel voice data applied from the third latch 32A as an address and outputs the corresponding data for conversion to the North American to European method stored at the address. The side voice data is converted into the trunk line data of another coding scheme. In this way, the parallel-type data output from the second PROM 33 is applied to the fourth shift register 31B via the fourth latch 32B, converted into a serial format, and then converted into the serial format through the third three-state buffer 52B. By being applied to the trunk interface unit 51, it is output to the trunk line side through the digital trunk interface unit 51.

At this time, it should be noted that the voice signal converted in the North American to European method is delayed by one time slot (T / S), so that the switching of the input data transmission path input to the digital switching circuit unit 40 is performed by one type slot ( T / S) is delayed and the switching of the highway outputted from the digital switching circuit unit 40 to the North American-European conversion circuit unit should also delay one time slot (T / S). The conversion output to the digital trunk interface unit 51 is converted in the same manner as the change input to the digital switching circuit unit 40. In the contents of the first and second PROMs 23 and 33, the first PROM 23 is used in the North American method. If data is stored to be converted to the European method, the second PROM 33 stores data to be converted from the European method to the North American method.

Unlike the conventional method in which the type of the private exchange was determined by the trunk type (North American or European) of the partner station by providing a voice signal conversion device of the private exchange according to the present invention operating as described above, Regardless, it is possible to determine the type of private exchange (North America or Europe) and to simultaneously connect with a counterpart with a North American trunk as well as a counterpart with a European trunk within the private exchange. In addition, there is an effect that the coding scheme of both exchanges can be matched without using the existing conversion equipment to match the coding scheme of both exchanges.

Claims (9)

An apparatus for converting a voice signal of a private switch, comprising: a system controller (10) for controlling overall system and detecting a format of input / output data and generating a control signal for opening and closing an input / output data transmission path; A data transmission path opening and closing unit 50 for opening and closing a connection to an input / output data transmission path to a trunk line subscriber according to a control signal of the system control unit 10; An input data conversion unit (20) for converting the trunk line side data applied from the data transmission line opening / closing unit (50) through the input data transmission line to the station side data of another coding scheme; The data received from the input data conversion unit 20 and the data transmission line opening and closing unit 50 is transmitted to the subscribers, and the data transmission path opening and closing unit 50 and output data to be described later are converted by receiving the transmission data of the extension subscriber. A digital switching circuit section 40 output to the section 30 side; Output data conversion unit 30 for converting the transmission data of the extension subscriber received through the digital switching circuit unit 40 to the trunk line-side data of the other coding scheme to be transmitted to the data transmission path opening and closing unit 50 through the output data transmission path Voice signal converter of the private exchange, characterized in that it comprises a). The system control apparatus of claim 1, further comprising: a microprocessor (11) for performing system-wide control and checking a scheme of input / output transmission data and outputting a conversion control signal; An address decoder (12) connected to the microprocessor (11) for decoding an address and outputting an address enable signal; The first and second output terminals Q are operated by receiving a conversion control signal output from the microprocessor 11 to a data input terminal D and receiving an address enable signal of the address decoder 12 as a clock signal. And a D flip-flop (13) for outputting a signal via (/ Q). The data transmission path opening and closing unit (50) according to claim 1 or 2, further comprising: a digital trunk interface unit (51) for inputting and outputting data to and from a trunk line; The input data converting unit 20 receives data from the digital trunk interface unit 51 according to an output signal from the second output terminal / Q of the D flip-flop 13 included in the system control unit 10. A first three state buffer 52A to be applied to; The data from the digital trunk interface unit 51 is applied to the digital switching circuit unit 40 according to the output signal of the first output terminal Q of the D-flop 13 provided in the system control unit 10. An applied second three state buffer 53A; The digital trunk interface unit 51 receives data from the output data converting unit 30 according to an output signal from the second output terminal / Q of the D flip-flop 13 included in the system control unit 10. A third three state buffer 52B to be applied to; The data from the digital switching circuit unit 40 is applied to the digital trunk interface unit 51 according to the output signal of the first output terminal Q of the D flip-flop 13 included in the system control unit 10. And a fourth three-state buffer (53B) to be applied. 2. The apparatus of claim 1, wherein the input data converting section (20) comprises: a first shift register (21A) for receiving serial data from the data transmission line opening / closing section (50) and converting the data into parallel data; A first latch 22A receiving data from the first shift register 21A; A first PROM (23) for receiving the data from the first latch (22A) and converting the data into internal data of another coding scheme; A second latch 22B receiving data of the first PROM 23; And a second shift register (21B) for converting the parallel data applied from the second latch (22B) into serial data and outputting the data to the digital switching circuit section (40). Voice signal converter. 3. The output data converter (30) according to claim 1, further comprising: a third shift register (31A) for receiving serial data from the digital switching circuit (40) and converting the data into a parallel data; A third latch (32A) receiving data from the third shift register (31A); A second PROM (33) which receives data from the third latch (32A) and converts the data into trunk line side data of another coding scheme; A fourth latch (32B) receiving data from the second PROM (33); And a fourth shift register 31B for converting the parallel-type data received from the fourth latch 32B into serial-type data and applying the same to the data transmission path opening and closing unit 50 side. Voice signal converter. The apparatus of claim 4 or 5, wherein the first latch 22A and the third latch 32A operate in synchronization with the first latch clock signal / AL. . 6. The apparatus of claim 4 or 5, wherein the second latch 22B and the fourth latch 32B operate in synchronization with the second latch clock signal / BL. . The output signal of the inverter 54 according to claim 4 or 5, wherein the first shift register 21A and the third shift register 31A are inverted by receiving a clock signal (/ D ₂ MHz) of a predetermined frequency. And a voice signal converting apparatus of a private exchange. The second and fourth shift registers 21B and 31B and the digital switching circuit 40 operate in synchronization with a clock signal of a predetermined frequency (2 MHz). Voice signal converter of private exchange.