KR950035235A - Call circuit of digital key phone with internal sidetone function - Google Patents

Call circuit of digital key phone with internal sidetone function Download PDF

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Publication number
KR950035235A
KR950035235A KR1019940010342A KR19940010342A KR950035235A KR 950035235 A KR950035235 A KR 950035235A KR 1019940010342 A KR1019940010342 A KR 1019940010342A KR 19940010342 A KR19940010342 A KR 19940010342A KR 950035235 A KR950035235 A KR 950035235A
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KR
South Korea
Prior art keywords
call
digital
converting
switching
key phone
Prior art date
Application number
KR1019940010342A
Other languages
Korean (ko)
Other versions
KR970005262B1 (en
Inventor
박병민
Original Assignee
박성규
대우통신 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 박성규, 대우통신 주식회사 filed Critical 박성규
Priority to KR1019940010342A priority Critical patent/KR970005262B1/en
Publication of KR950035235A publication Critical patent/KR950035235A/en
Application granted granted Critical
Publication of KR970005262B1 publication Critical patent/KR970005262B1/en

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Classifications

    • 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)
  • Interface Circuits In Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

본 발명은, 내선간의 통화시에도 측음을 제공하고, 국선통화시에는 종래보다 우수한 통화 품직을 제공하도록 한 디지틀 키폰의 통화 회로를 제공하는데 그 목적이 있으며, 통화라인상에서 입력되는 디지틀 신호를 디지틀/아날로그(D/A) 변환하여 디지틀 키폰 내로 전달하거나, 핸드셋이나 스피커를 통해 입력되는 통화신호를 통신 로상으로 아날로그/디지탈(A/D) 변환하여 제공하는 A/D 및 D/A변환수단(1)과, 측음 제공을 위해 상기 A/D 및 D/A 변환수단(1)의 D/A 변환신호 출력단에 연결된 피드백 저항(R)과, 내선통화모드와 국선통화 모드를 나타내는 외부의 제어장치로 부터의 제어신호에 제어를 받아 국선통화시에는 상기 저항을 거치지 않고 상기 A/D 및 D/A변환수단(1)으로 직접 통화로가 형성되게 통화경로를 스위칭하고, 내선통화시에는 상기 저항(R)을 거친 통화로가 형성되도록 통화경로를 스위칭하는 스위칭 수단(11)을 구비하도록 하였다.The present invention has a purpose to provide a digital key phone call circuit for providing side tones even during internal calls, and to provide a better call quality than conventional calls, and for digital signals to be input on a call line. A / D and D / A converting means for converting analog (D / A) and transmitting the same into a digital key phone or converting a call signal input through a handset or a speaker into an analog / digital (A / D) conversion on a communication path (1 And a feedback resistor (R) connected to the D / A conversion signal output terminal of the A / D and D / A converting means (1) to provide side tones, and an external control device indicating an internal call mode and a trunk line call mode. Under the control of the control signal from the call, the call path is switched to form a direct call path to the A / D and D / A conversion means 1 without passing through the resistance during the trunk line call, and the resistance ( R) rough Such that the furnace was formed to have a switching means 11 for switching a call path.

Description

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

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

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

Claims (2)

디지틀 키폰의 통화회로에 있어서, 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 변환수단(1)과, 측음 제공을 위해 상기 A/D 및 D/A 변환수단(1)의 D/A 변환신호를 출력단에 연결된 피드백 저항(R)과, 내선통화모드와 국선통화 모드를 나타내는 외부의 제어 장치의 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 a digital / analog (D / A) and transmitted into the digital key phone, or a call signal input through a handset or a speaker can be analog / digital ( A / D and D / A converting means 1 for converting and providing the A / D and D / A converting signals of the A / D and D / A converting means 1 for providing side sound feedback connected to an output terminal. Under the control of the resistor R and the external control device indicating the internal call mode and the trunk line call mode, the trunk line call is directly directed to the A / D and D / A converting means 1 without passing through the resistor R. The switching circuit of the digital key phone characterized in that it comprises a switching means for switching the call path so that a call path is formed, and during the internal call, switching the call path so that a call path passing through the resistance (R) is formed. . 제1항에 있어서, 상기 스위칭 수단은 세가지 스위칭 상태를 가지는 멀티 플렉서를 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. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940010342A 1994-05-12 1994-05-12 Digital key-phone KR970005262B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940010342A KR970005262B1 (en) 1994-05-12 1994-05-12 Digital key-phone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940010342A KR970005262B1 (en) 1994-05-12 1994-05-12 Digital key-phone

Publications (2)

Publication Number Publication Date
KR950035235A true KR950035235A (en) 1995-12-30
KR970005262B1 KR970005262B1 (en) 1997-04-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019940010342A KR970005262B1 (en) 1994-05-12 1994-05-12 Digital key-phone

Country Status (1)

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KR (1) KR970005262B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100636035B1 (en) 2003-11-08 2006-10-18 삼성전자주식회사 Method and apparatus for drying a wafer and wafer treatment apparatus comprising the wafer drying apparatus

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Publication number Publication date
KR970005262B1 (en) 1997-04-14

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