KR950003675B1 - Self-error detecting circuit - Google Patents

Abstract

The circuit can diagnose the problem of the system and repair it by itself. The circuit is suitable for time-divisional voice exchange system that uses pulse code modulation method. When designing the system, the exchange can do its function reliably by adding the self diagnosis function to the system. The circuit includes an external connector(100), an internal connector(200), a tone generator/detector(300) communicaing to a voice signal exchange circuit(500) through a receiving/transmitting high-way and a system controller(400) that communicates to the voice signal exchange circuit with the address bus and data bus and controls the external connector, internal connector and tone generator/detector through the control bus.

Description

Self Diagnosis Circuit of Simple Exchange Device

1 is a voice division circuit diagram of a space division method.

2 is a block diagram of a self-diagnosis circuit of the present invention.

3, 4 and 5 are circuit diagrams of the external connector 100, the internal connector 200, and the tone generator / detector 300 of FIG.

* Explanation of symbols for main parts of the drawings

100: external connection 200: internal connection

300: tone generation / detection unit 400: system control unit

500: audio signal exchange circuit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-diagnosis circuit of a simple exchange device, and more particularly, to a self-diagnosis circuit of a simple exchange device adapted to be suitable for a time division voice exchange device using pulse code modulation (PCM).

In general, a key telephone for exchanging an analog voice signal of a space division method has been used. However, in the space division method of a voice exchange circuit, it is difficult to check the entire communication path at a specific port. This will be briefly described with reference to the accompanying drawings.

FIG. 1 is a spatially divided voice exchange circuit diagram. As shown in FIG. 1, a call path is connected by turning on a cross point switch 1 of an X-axis port and a Y-axis port.

However, to connect the X-axis port and the X-axis port, one line of the Y-axis is required, so there is no way to connect the two X-axis ports without disturbing the Y-axis. For this reason, since it is very difficult to perform self-diagnosis efficiently in the analog voice exchange circuit, there is a problem of being economical in the analog type simple switch without using the self-diagnosis circuit.

In view of the above problems, the present invention is capable of timely maintenance by diagnosing a failure, and thus, a pulse code modulation that enables simple and efficient self-diagnosis by adding a function related to self-diagnosis when designing a system for reliable operation. In the simple switching apparatus using the voice exchange unit, the external connection unit and the internal connection of the internal diagnostic circuit of the internal connection of the invention, which will be described in detail with reference to the accompanying drawings.

2 is a block diagram of the self-diagnosis circuit of the present invention as shown in the voice signal circuit (through the transmission and reception highway, respectively, the external connection unit 100, the internal connection unit 200 and the tone generation / detection unit 300 ( And the system control unit 400 communicating with the voice signal exchange circuit 500 and the address bus and the data bus via the control bus to the external connection unit 100, the internal connection unit 200, and the tone generation / It was configured to control the sensing unit 300.

3, 4, and 5 are detailed circuit diagrams of the external connector 100, the internal connector 200, and the tone generator / detector 300. As shown therein, an external ring line R ₁ and by tipseon (T ₁₎ is a ring detect circuit 101 and through the dial circuit 102 in common and connected to a hybrid coil (TT _1), the hybrid coil (TT _1), the resistance (R ₁₁ -R ₁₃₎ The external connection unit 100 is configured to be connected to the analog / digital and digital / analog converter 103 whose gain is controlled and communicate with the voice signal exchange circuit 500 through a transmission and reception highway.

In addition, an inner ring wire R ₂ and a tip wire T ₂ are connected to the hybrid coil TT ₂ through a power supply and a closed circuit detection unit 201, and the hybrid coil TT ₂ is a resistor R ₂₁ -R. _{23 is} connected to the analog / digital and digital / analog converter 202 whose gain is controlled by the extension, and the extension connector 200 is configured to communicate with the voice signal exchange circuit 500 through a transmission and reception highway.

Then, the grounded capacitor C ₃₂ is connected to the non-inverting input terminal of the operational amplifier OP ₃₁ , and the connection point is connected to the output of the operational amplifier OP ₃₁ through the capacitor C ₃₁ and the resistor R ₃₁ . The terminal is connected to the inverting input terminal of the operational amplifier OP ₃₂ through the variable resistor VR ₃₂ , and then connected to the output terminal of the operational amplifier OP ₃₂ through the resistor R ₃₃ again. The connection point is connected to the inverting input terminal of the operational amplifier OP ₃₁ through a resistor R ₃₂ and connected to the output terminal of the operational amplifier OP ₃₁ through a variable resistor VR ₃₁ again. A tone detection circuit 302 composed of a tone generating circuit 301, a frequency detector 32 and a filter 31 connected to the system control unit, the tone detecting circuit 302 and the tone generating circuit 301 thereof. Analog / digital and connected with the voice signal exchange circuit 500 through the transmit and receive highway connected to the The jital / analog converter 303, the tone generating / detecting unit 300 as was constructed.

Referring to the operation and effect of the self-diagnosis circuit in the simplified exchange device of the present invention configured as described above are as follows.

The present invention is applied to the same system as the patent application (notification number 87-1098, application number 83-2909, name: key telephone system) in one embodiment, the voice exchange and control operation of the simple switching device is Since the operation is the same as the operation of the self-diagnosis circuit only the operation will be described.

The tone generating circuit 301 generates a tone of a specified frequency and sends the tone source to the audio signal exchange circuit 500 through the analog / digital and digital / analog converter 303. At this time, the system controller 400 designates a pulse code modulation highway and time slot to be diagnosed in advance, and one port of an external line or an internal station. The tone source signal arrives at the external connection unit 100 or the internal connection unit 200 via the transmission highway in the voice signal exchange circuit 500 and is converted into an analog signal in the analog / digital and digital / analog converters 103 or 203. the hybrid coil (TT ₁₎ or (TT ₂₎ after the hybrid coil (TT ₁₎ or (TT ₂₎ resistors (R _13), or (R ₂₃₎ the signal is a resistance (R _11, R ₁₂₎ taken in is sent to the Or amplified by a ratio of (R ₂₁ , R ₂₂ ) and digitally converted through an analog / digital and digital / analog converter 103 or 203 and returned through the receive highway.

At this time, the magnitude of the signal returned from the external connection unit 100 or the internal connection unit 200 to the reception highway is

Carrier signal = tone source signal level ×

(Resistor (R _21- R ₂₂ ) is for internal connection)

Same as

The signal returned through the reception highway is converted into analog signals through the analog / digital and digital / analog converters 303 of the tone generator / detector 300 in the voice signal exchange circuit 500 and then the tone detection circuit ( Only the necessary signal is selected through the filter 31 of the 302, and the signal is detected and transmitted to the system controller 400 through the frequency detector 32. The system control unit 400 repeatedly executes the above operation process in the time slots of the all external connection unit 100 and the internal connection unit 200 and the voice signal exchange circuit 500 to inform the user of the result.

)하여 연산증폭기(OP₃₁) 의 반전입력단자로 입력시키면, 이 신호는 다시 증폭(

)되어 연산증폭기(OP₃₁)를 통하여 톤이 발생된다. 가변저항(VR₃₁),(VR₃₂)은 정확한 주파수 및 시그날 크기를 맞추는데 사용되고, 주파수 및 시그날의 크기는 발진부와 증폭부의 결합으로 이루어진다.The tone generating circuit 301 of the tone generating / detecting unit 300 were used for both of the operational amplifier (OP _31), (OP ₃₂₎ in order to get the exact frequency and signal magnitude ratio of the operational amplifier (OP ₃₁₎ An integrating circuit (resistance (R ₃₁ ), condenser (C ₃₁ , C ₃₂ )) is connected to the inverting input terminal to synthesize the oscillator, and the operational amplifier (OP ₃₂ ) amplifies the generated signal (

And input it to the inverting input terminal of the operational amplifier OP ₃₁ , this signal is amplified again.

Tone is generated through the operational amplifier OP ₃₁ . The variable resistors VR ₃₁ and VR ₃₂ are used to match the correct frequency and signal size, and the frequency and signal size are composed of a combination of an oscillator and an amplifier.

In addition, the tone detection circuit 302 removes the signals other than the frequencies generated by the tone generation circuit 301 using the commercial frequency filter 31 and sends them to the frequency detector 32 when the signal of a predetermined size or more is inputted. The output of the detector 32 becomes high potential, and if it is not over a certain size, it becomes low potential. The frequency detector 32 uses a commercial frequency detector, which reads the output terminal of the frequency detector 32 from the system controller 400 to indicate that the communication path is normal if the high potential is high, and that an abnormality has occurred in the communication path if the potential is low. .

Therefore, when the tone generation circuit 301 generates a tone of the frequency specified, the voice signal exchange circuit 500 in order to diagnose the pulse code modulation highway, time slots and ports of the outside line or the extension line connection unit 100 or the extension connection unit Sending the tone source to the 200 to the signal transmitted from its hybrid coil (TT ₁ ) or (TT ₂ ) to the tone detection circuit 302 to inform the system control unit 400 is normal and abnormal by the detected signal do.

As described above, the present invention enables the system to check the status of its own and notify the user while using the G-telephone. Self-diagnosis is effective.

Claims (3)

The tone generator 301 for generating a specific frequency, the voice signal exchange circuit 500 for transmitting and receiving the frequency of the tone generator 301 through a transmission and reception highway, and the signal through the voice signal exchange circuit 500 Receives and converts the analog signal into an analog signal and converts the output signal of the internal and external connection parts 200 and 100 and the voice signal exchange circuit 500 into an analog signal to selectively detect a specific frequency. System control unit 400 for controlling the time slots of the internal and external connection unit 200, 100 and the voice signal exchange circuit 500 by receiving the tone detection circuit 302 and the signal of the tone detection circuit 302. Self-diagnosis circuit of a simple exchange device characterized in that the configuration. The method of claim 1, wherein the tone generating circuit 301 comprises an operational amplifier (OP ₃₁₎ in the one side input terminal (+) a capacitor (C ₃₂₎ and one side input terminal (+) is the other side of the grounded operational amplifier (OP ₃₂₎ in the The variable resistor VR ₃₂ of the input terminal (-) is connected to the output terminal of the operational amplifier OP ₃₁ through the capacitor 31 and the resistor R ₃₁ , and the other side of the operational amplifier OP ₃₁ . The input terminal (-) is connected to the output terminals of the operational amplifiers OP ₃₁ and OP ₃₂ through the variable resistor V ₃₁ and the resistor R ₃₂ , respectively, and the other input terminal of the operational amplifier OP ₃₂ . The self-diagnosis circuit of the simplified exchanger is configured by connecting the negative terminal and the output terminal with a resistor (R ₃₃ ). 2. The self-diagnosis apparatus of the simplified exchange device according to claim 1, wherein the tone detection circuit (302) comprises a filter (31) for selecting only a specific frequency and a frequency detector (32) for detecting a frequency of an output signal of the filter (31). Circuit.

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