KR970005262B1 - Digital key-phone - Google Patents

Digital key-phone Download PDF

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Publication number
KR970005262B1
KR970005262B1 KR1019940010342A KR19940010342A KR970005262B1 KR 970005262 B1 KR970005262 B1 KR 970005262B1 KR 1019940010342 A KR1019940010342 A KR 1019940010342A KR 19940010342 A KR19940010342 A KR 19940010342A KR 970005262 B1 KR970005262 B1 KR 970005262B1
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South Korea
Prior art keywords
call
digital
conversation
line
path
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KR1019940010342A
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Korean (ko)
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KR950035235A (en
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박병민
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대우통신 주식회사
박성규
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/58—Anti-side-tone circuits

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

To provide a telephone circuit that has an extension line side sound function and maintains a high quality of conversation. The telephone circuit of digital keyphone consists of an Analog/Digital(A/D) and Digital/Analog(D/A) conversion unit(1) and a switching unit(11). The A/D and D/A conversion unit(1) is to convert a digital signal from telephone line into D/A and to deliver it to a digital keyphone, or to convert a conversation signal through the handset or speaker into the A/D. The switching unit(11), controlled by a feedback resistance(R) connected to the D/A conversion signal terminal of the A/D and D/A conversion unit(1) and an exterior control device indicating extension line and national line conversation modes, is to switch a conversation path directly to the A/D and D/A conversion unit(1) without passing the resistance(R) in the case of national line conversation and is to form a conversion path through the resistance(R). Thereby, it is possible to provide the side sound of extension line conversation in the digital keyphone, and to increase a conversation quality in the national line conversation.

Description

내선 측음기능을 갖는 디지틀 키폰의 통화회로Call circuit of digital key phone with internal sidetone function

제1도는 종래의 디지틀 키폰의 통화회로도.1 is a circuit diagram of a conventional digital key phone.

제2도는 본 발명에 따른 디지틀 키폰회로의 구성도.2 is a block diagram of a digital key phone circuit according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 아날로그/디지틀 변환 및 디지틀/아날로그(A/D 및 D/A 변환부)1: Analog / digital conversion and digital / analog (A / D and D / A converter)

2 : 송신이득 지정부 3 : 수신 세력 조정부2: Transmission gain specifying unit 3: Receiving force adjusting unit

4 : 아날로그 스위치 R : 저항4: analog switch R: resistance

11 : 멀티플렉서11: multiplexer

본 발명은 디지틀 키폰에서의 내선 측음 발생기능이 부가된 통화회로에 관한 것으로, 특히 국선뿐만 아니라 내선인 인터콤 통화시에도 우수한 통화품질을 유지하면서 내선 측음 발생기능을 갖는 통화회로에 관한 것이다.The present invention relates to a call circuit to which an extension side tone generation function is added in a digital key phone, and more particularly, to a call circuit having an extension side tone generation function while maintaining excellent call quality in intercom calls as well as CO lines.

일반적으로 측음이라는 것은 통화시 송신하는 것이 자기 자신의 귀에 들리도록 하는 일종의 송신 궤환음인데, 송수화가 분리되어 있는 디지틀 키폰에서는 내선통화시 측음을 제공할 수 없었다.In general, the sidetone is a kind of transmission feedback sound that allows the user to transmit his / her own ear during the call. The digital keyphone with the handset separated cannot provide the sidetone during the internal call.

제1도를 통하여 종래의 기술을 살펴보면, 제1도는 종래의 디지틀 키폰의 통화회로도로서, 도면에서 1은 아날로그/디지틀 변환 및 디지틀/아날로그(이하, A/D 및 D/A라 한다.) 변환부, 2는 송신이득 지정부, 3은 수신 세력 조정부, 4는 아날로그 스위치, R은 저항을 각각 나타낸다.Referring to FIG. 1, FIG. 1 is a communication circuit diagram of a conventional digital key phone, in which 1 is analog / digital conversion and digital / analog (hereinafter referred to as A / D and D / A conversion). 2 denotes a transmission gain designation unit, 3 denotes a reception force adjustment unit, 4 denotes an analog switch, and R denotes a resistance.

A/D 및 D/A 변환부(1)는 통화라인상에서 입력되는 디지틀 신호를 D/A 변환하여 전달하거나, 핸드셋이나 스피커를 통해 입력되는 통화신호를 통신로상으로 A/D 변환하여 제공하며, 일반적인 'COMBO' IC를 사용한다. 그리고 아날로그 스위치(4)는 외부의 제어신호에 따라 상기 A/D 및 D/A 변환부(1)에서 변환된 음성신호를 원하는 경로(핸드셋 통화 모드와 스피커 통화 모드를 선택할 수 있는)로 전달한다.The A / D and D / A converter 1 converts and transmits a digital signal input on a call line by D / A conversion, or provides A / D conversion on a communication path through a call signal input through a handset or a speaker. Use a common 'COMBO' IC. The analog switch 4 transfers the voice signal converted by the A / D and D / A converter 1 to a desired path (which can select a handset call mode and a speaker call mode) according to an external control signal. .

그러므로 A/D 및 D/A 변환부(1)에서 디코딩된 음성신호는 아날로그 스위치(4)에 공급되었다가 외부의 제어장치(CPU)로부터 국선 또는 내선을 감지한 결과에 따라 제어신호를 아날로그 스위치(4)에 제공하면, 아날로그 스위치(4)의 스위칭에 의해 선택된 경로로 음성신호가 전달되게 된다.Therefore, the audio signal decoded by the A / D and D / A converter 1 is supplied to the analog switch 4, and the control signal is converted to the analog switch according to a result of detecting a trunk line or an internal station from an external control unit (CPU). When provided to (4), the audio signal is transmitted to the path selected by the switching of the analog switch (4).

상기와 같은 종래의 구성에 의한 디지틀 키폰에서는 송수화가 분리되어 디지틀 폰 끼리의 내선통화시 측음이 존재하지 않았다. 그런데, 내선의 측음을 위해서 통화시 측음을 발생시키기 위하여 연결된 저항(R)의 값을 조정하면, 국선통화시 측음이 너무 커지게 되어 통화품질이 현저하게 나빠지게 된다.In the digital key phone according to the conventional configuration as described above, the handset was separated and there was no side tone during the internal call between the digital phones. However, when the value of the connected resistor R is adjusted in order to generate sidetones in the call for the sidetone of the extension, the sidetone becomes too large during the trunk line call and the call quality is significantly worsened.

따라서, 상기 종래기술의 문제점을 해결하기 위하여 안출된 본 발명은, 내선간의 통화시에도 측음을 제공하고, 국선통화시에는 종래보다 우수한 통화품질을 제공하도록 한 디지틀 키폰의 통화회로를 제공하는데 그 목적이 있다.Accordingly, the present invention has been made in order to solve the problems of the prior art, to provide a side-tone even when the call between the extension, and to provide a call circuit of the digital key phone to provide a better call quality than the conventional when the trunk line call. There is this.

본 발명은 상기 목적을 달성하기 위하여, 통화라인상에서 입력되는 디지틀 신호를 디지틀/아날로그(D/A) 변환하여 디지틀 키폰 내로 전달하거나, 핸드셋이나 스피커를 통해 입력되는 통화신호를 통신로상으로 아날로그/디지틀(A/D) 변환하여 제공하는 A/D 및 D/A 변환수단과, 측음 제공을 위해 상기 A/D 및 D/A 변환수단의 D/A 변환신호 출력단에 연결된 피드백 저항과, 내선통화 모드와 국선통화 모드를 나타내는 외부의 제어장치의 제어를 받아 국선통화시에는 상기 저항을 거치지 않고 상기 A/D 및 D/A 변환수단으로 직접 통화로가 형성되게 통화경로를 스위칭하고, 내선통화시에는 상기 피드백저항을 거친 통화로가 형성되도록 통화경로를 스위칭하는 스위칭 수단을 구비하도록 하였다.In order to achieve the above object, the present invention converts a digital signal input on a call line into a digital / analog (D / A) and delivers it into a digital keyphone, or a call signal input through a handset or a speaker through an analog / A / D and D / A conversion means for providing digital (A / D) conversion, feedback resistors connected to the D / A conversion signal output terminals of the A / D and D / A conversion means for providing sidetones, and internal calls Under the control of an external control device indicating a mode and a trunk line call mode, during a trunk line call, the call path is switched so that a direct call path is formed by the A / D and D / A conversion means without passing through the resistance. It is to be provided with a switching means for switching the call path to form a call path through the feedback resistance.

이하, 첨부된 제2도를 참조하여 본 발명의 일실시예를 상세히 설명한다.Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 2.

제2도는 본 발명에 따른 디지틀 키폰회로의 구성도로서, 도면에서 11은 멀티플렉서를 나타낸다.2 is a configuration diagram of a digital key phone circuit according to the present invention, in which 11 is a multiplexer.

도면에 도시된 바와 같이, 본 발명이 제1도의 종래기술의 구성과 다른 점은 새로운 점은, 아날로그 스위치를 3가지 스위칭 상태를 갖는 멀티플렉서(11)로 대치하였고, 멀티플렉서(11)가 국선통화때에는 피드백 저항(R)을 통하지 않도록 하고, 내선통화인 경우에는 피드백 저항을 통해 통화가 이루어지게 제어장치(CPU)가 제어신호를 보내게 한 점이다.As shown in the figure, the present invention is different from the configuration of the prior art of FIG. 1, and a new point is that the analog switch is replaced with a multiplexer 11 having three switching states, and the multiplexer 11 is in the case of a trunk line call. The control unit (CPU) sends a control signal so that the call is made through the feedback resistor while avoiding the feedback resistor (R).

구체적으로 살펴보면, A/D 및 D/A 변환부(1)로부터 디코딩된 음성신호는 수신 세력 조정부(3)를 거친 후 멀티플렉서(11)에 도달한다.In detail, the voice signal decoded from the A / D and D / A converter 1 passes through the reception force adjusting unit 3 and reaches the multiplexer 11.

상기 멀티플렉서(11)는 외부의 CPU의 제어신호를 공급받아 스위칭 동작을 행하는데, 01제어신호가 국선 통화임을 알리면 도면에서 C단과 CX단, B단과 BY단, A와 AY단을 연결시켜, 피드백 저항을 거치지 않고 통화가 이루어지게 한다. 이렇게 되면 디지틀 폰 내부에서는 측음이 발생되지 않으므로 외부(교환기, 메인 장치등)에서 발생되는 측음만이 들리게 되며 이에 따라 통화품질은 향상되게 된다.The multiplexer 11 receives a control signal from an external CPU and performs a switching operation. When the 01 control signal indicates that a CO line call is made, the multiplexer 11 connects the C and CX stages, the B and BY stages, and the A and AY stages in the drawing. Make calls without resistance. In this case, since the side tone is not generated inside the digital phone, only the side tone generated from the outside (exchanger, main device, etc.) is heard, and thus the call quality is improved.

또한 내선통화시는 공급되는 제어신호에 따라, C단과 CX단, B단과 BX단, A와 AY단이 연결되게 하여, 피드백 저항(R)을 통해 내선통화시 측음이 발생되도록 한다.In addition, during an internal call, the C and CX stages, the B and BX stages, and the A and AY stages are connected according to the supplied control signal, so that the side tone is generated during the internal call through the feedback resistor R. FIG.

멀티플렉서(11)의 제어단에는 통화모드에 따른 제어데이타가 인가되게 하였고, 내선통화와 국선통화에 따른 CPU로부터의 제어데이타 제공은 통상의 지식을 가진자가 극히 용이하게 알 수 있는 공지의 기술이므로 본 발명에서 상세한 설명은 피하기로 한다.The control data of the multiplexer 11 is applied to the control data according to the call mode, and the control data from the CPU according to the internal call and the trunk line call is a well-known technique that can be easily known by those skilled in the art. Detailed description of the invention will be avoided.

따라서, 상기와 같이 구성되어 동작하는 본 발명은, 디지틀 키폰에 있어서 내선간 통화시의 측음을 제공하였으며, 국선통화시 통화품질을 향상시키는 효과가 있다.Therefore, the present invention configured and operated as described above provides a side tone for inter-line calls in a digital key phone, and has an effect of improving call quality during a trunk line call.

Claims (2)

디지틀 키폰의 통화회로에 있어서, 통화라인상에서 입력되는 디지틀 신호를 아날로그/디지틀(D/A) 변환하여 디지틀 키폰 내로 전달하거나, 핸드셋이나 스피커를 통해 입력되는 통화신호를 통신로상으로 아날로그/디지틀(A/D) 변환하여 제공하는 A/D 및 D/A 변환수단(1)과, 측음 제공을 위해 상기 A/D 및 D/A 변환수단(1)의 D/A 변환 신호 출력단에 연결된 피드백 저항(R)과, 내선통화 모드와 국선통화 모드를 나타내는 외부의 제어장치의 제어를 받아 국선통화시에는 상기 저항(R)을 거치지 않고 상기 A/D 및 D?A 변환수단(1)으로 직접 통화로가 형성되게 통화경로를 스위칭하고, 내선통화시에는 상기 저항(R)을 거친 통화로가 형성되도록 통화경로를 스위칭하는 스위칭 수단(11)을 구비하도록 한 것을 특징으로 하는 디지틀 키폰의 통화회로.In the call circuit of a digital key phone, a digital signal input on a call line is converted into an analog / digital (D / A) signal and transferred into the digital key phone, or a call signal input through a handset or a speaker is transmitted on an analog / digital channel ( A / D) A / D and D / A converting means 1 for converting and providing feedback, and a feedback resistor connected to the D / A converted signal output terminal of the A / D and D / A converting means 1 for providing sidetones. (R) and a direct call to the A / D and D? A conversion means (1) without passing through the resistor (R) during a trunk line call under the control of an external control device indicating an internal call mode and a trunk line call mode. And a switching means (11) for switching a call path so that a path is formed, and for switching a call path so that a call path passing through said resistance (R) is formed during an internal call. 제1항에 있어서, 상기 스위칭 수단은 세가지 스위칭 상태를 가지는 멀티플렉서를 구비하도록 한 것을 특징으로 하는 디지틀 키폰의 통화회로.2. The circuit according to claim 1, wherein said switching means comprises a multiplexer having three switching states.
KR1019940010342A 1994-05-12 1994-05-12 Digital key-phone KR970005262B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7386944B2 (en) 2003-11-08 2008-06-17 Samsung Electronics Co., Ltd. Method and apparatus for drying a wafer, and an apparatus for cleaning and drying a wafer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7386944B2 (en) 2003-11-08 2008-06-17 Samsung Electronics Co., Ltd. Method and apparatus for drying a wafer, and an apparatus for cleaning and drying a wafer

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