KR910017819A - Call circuit of key phone - Google Patents

Call circuit of key phone Download PDF

Info

Publication number
KR910017819A
KR910017819A KR1019900004388A KR900004388A KR910017819A KR 910017819 A KR910017819 A KR 910017819A KR 1019900004388 A KR1019900004388 A KR 1019900004388A KR 900004388 A KR900004388 A KR 900004388A KR 910017819 A KR910017819 A KR 910017819A
Authority
KR
South Korea
Prior art keywords
amplifier
telephone
resistor
key
circuit
Prior art date
Application number
KR1019900004388A
Other languages
Korean (ko)
Other versions
KR920009872B1 (en
Inventor
이규택
Original Assignee
정몽헌
현대전자산업 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.)
Filing date
Publication date
Application filed by 정몽헌, 현대전자산업 주식회사 filed Critical 정몽헌
Priority to KR1019900004388A priority Critical patent/KR920009872B1/en
Publication of KR910017819A publication Critical patent/KR910017819A/en
Application granted granted Critical
Publication of KR920009872B1 publication Critical patent/KR920009872B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6008—Substation equipment, e.g. for use by subscribers including speech amplifiers in the transmitter circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
    • H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6016—Substation equipment, e.g. for use by subscribers including speech amplifiers in the receiver circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2201/00—Electronic components, circuits, software, systems or apparatus used in telephone systems
    • H04M2201/34—Microprocessors

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Telephone Function (AREA)

Abstract

내용 없음No content

Description

키폰전화기의 통화회로Call circuit of key phone

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명에 따른 키폰전화기의 통화회로의 블럭도, 제2도는 제1도의 상세회로도.1 is a block diagram of a call circuit of a key-phone telephone according to the present invention, and FIG. 2 is a detailed circuit diagram of FIG.

Claims (6)

키폰전화기의 통화회로에 있어서, 송화기(T)로부터 제1송신증폭부(3), 이득제어부(2), 제2송신증폭부(1) 및 주장치와 접속되는 트랜스 T1이 종속접속되되, 상기 이득제어부(2)는 CPU(7)의 이득제어신호에 의하여 이득이 제어되도록 접속되고, 상기 CPU(7)의 뮤트 제어신호에 의해 상기 송화기(T)의 출력신호를 통화중에 소정시간 뮤트시킬 수 있도록 상기 제1송신증폭부(3) 및 송화기(T)간에 접속 구성되는 뮤트제어부(4)와, 상기 트랜스 T1으로부터 수신증폭부(6) 및 수화기(R)가 종속접속되되, 상기 수신증폭부(6)에는 측음제어부(5)가 접속되고, 상기 측음 제어부(5)는 CPU의 측음제어 신호에 의하여 측음이 제어되도록 접속된 것을 특징으로 하는 키폰전화기의 통화회로.In the telephone circuit of the key-phone telephone, a transformer T 1 connected to the first transmission amplifier 3, the gain control unit 2, the second transmission amplifier 1, and the main device from the transmitter T is cascaded. The gain control unit 2 is connected so that the gain is controlled by the gain control signal of the CPU 7, and the mute control signal of the CPU 7 can mute the output signal of the talker T for a predetermined time during a call. The mute control unit 4 is configured to be connected between the first transmission amplifier 3 and the transmitter T so that the reception amplifier 6 and the receiver R are cascaded from the transformer T 1 . A side circuit control unit (5) is connected to the unit (6), and the side tone control unit (5) is connected so that the side tone is controlled by the sidetone control signal of the CPU. 제1항에 있어서, 상기 제1송신증폭부(3)는 그의 출력단자는 저항 R20을 경유해 접지되는 동시에 캐패시터 C2가 병렬 접속되는 저항 R9를 경유해 입력단자에 접속구성되는 연산증폭기 U3로 구성되는 것을 특징으로 하는 키폰전화기의 통화회로.The method of claim 1, wherein the first transmission amplifier section 3 is its output terminal The operation at the same time grounded via a resistor R 20 has the capacitor C 2 configuration connected to an input terminal via a resistor R 9 are connected in parallel to the amplifier U Call circuit of a key-phone telephone, characterized in that consisting of three . 제1항에 있어서, 이득제어부(2)는 상기 CPU(7)로부터 제어신호를 받고 상기 연산증폭기 U3의 출력을 입력으로 하는 이득제어 IC U2로 구성되는 것을 특징으로 하는 키폰전화기의 통화회로. 2. The call circuit of a key-phone telephone according to claim 1, wherein the gain control unit 2 comprises a gain control IC U 2 which receives a control signal from the CPU 7 and inputs an output of the operational amplifier U 3 . . 제1항에 있어서, 상기 제2송신증폭부(1)는 그의 출력단자는 저항 R5를 경유해 접지되는 동시에 캐패시터 C1이 병렬 접속되는 저항 R6를 경유해 그의 입력단자에 접속되는 연산증폭기 U1으로 구성되는 것을 특징으로 하는 키폰전화기의 통화회로.The method of claim 1, wherein the second operation transmitted amplifying section 1 to its output end shall via the resistor R 6 to be through to the ground at the same time, the capacitor C 1 is connected in parallel to be a resistance R 5 connected to its input terminal amplifier U Key telephone phone call, characterized in that the circuit consisting of the first. 제1항에 있어서, 상기 측음제어부(5)는 상기 CPU(7)로부터 제어신호를 받고 상기 연산증폭기 U1의 출력을 입력으로 하여 상기 수신증폭부(6)의 증폭이득을 조절할 수 있는 측음제어 IC U5를 포함하는 것을 특징으로 하는 키폰전화기의 통화회로.The method of claim 1, wherein the side tone control section 5 side tone control that can receive a control signal from the CPU (7) to the output of the operational amplifier U 1 as the input to control the amplification gain of the reception amplification unit 6, A communication circuit of a key-phone telephone, comprising: IC U 5 . 제1항 및 제2항에 있어서, 상기 수신증폭부(6)는 그의 출력단자는 저항 R14를 경유해 접시되는 동시에 저항 R15를 경유해 그의 한입력 단자에 접속되고 나머지 입력단자는 저항 R6를 경유해 상기 측음제어 IC U5에 접속되는 U4로 구성되는 것을 특징으로 하는 키폰전화기의 통화회로.3. The receiving amplifier (6) according to claim 1 or 2, wherein the receiving amplifier (6) has its output terminal dished out via a resistor (R 14 ) and connected to its one input terminal via a resistor (R 15) and the other input terminal is a resistor (R 6). And a U 4 connected to the side sound control IC U 5 via a telephone circuit of a key telephone telephone. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019900004388A 1990-03-31 1990-03-31 Keytelephone system KR920009872B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019900004388A KR920009872B1 (en) 1990-03-31 1990-03-31 Keytelephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019900004388A KR920009872B1 (en) 1990-03-31 1990-03-31 Keytelephone system

Publications (2)

Publication Number Publication Date
KR910017819A true KR910017819A (en) 1991-11-05
KR920009872B1 KR920009872B1 (en) 1992-11-02

Family

ID=19297546

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019900004388A KR920009872B1 (en) 1990-03-31 1990-03-31 Keytelephone system

Country Status (1)

Country Link
KR (1) KR920009872B1 (en)

Also Published As

Publication number Publication date
KR920009872B1 (en) 1992-11-02

Similar Documents

Publication Publication Date Title
KR920011158A (en) Secondary attenuator device for use in voice switching speakerphones and methods for selectively inserting losses into the speakerphone communication path
KR850000161A (en) Telephone circuit
KR910017819A (en) Call circuit of key phone
KR900005734A (en) Dialing confirmation sound output device and its control method
KR920006135B1 (en) Hands free unit eliminated echo signals in full duplex system
KR920011070B1 (en) Side tone prevention circuit
KR910015131A (en) A cordless phone device
KR920001541Y1 (en) Four lines doorphone circuit
US4412353A (en) Mixing circuit
KR100216628B1 (en) Transmitting noise reducing device in cellular phone
KR950004952B1 (en) Interface circuit for paging system terminal and receiver
KR940007129Y1 (en) Keytelephone system
KR890002374Y1 (en) Hybrid circuit of key system
SU860350A2 (en) Call device
KR830001580B1 (en) Voiceless two-wire simultaneous call device for a loudspeaker
SU150134A1 (en) Device for two-way dispatch communication
KR930001422Y1 (en) Voice signal compensating circuit
JPH0358223B2 (en)
KR930011536A (en) Extension and trunk line sharing circuit
JPS5627557A (en) Side-tone preventing circuit
KR950022535A (en) On-hook dialing device for cordless phones
KR930007135A (en) Hand-Free Circuit and Control Method for Bidirectional Communication of Automobile Telephones
KR20000016032U (en) Volume elimination apparatus of input signal in facsimile
JPS55147870A (en) Terminal equipment for data communication
KR920020870A (en) Method for preventing eavesdropping in radiotelephone

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
G160 Decision to publish patent application
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
LAPS Lapse due to unpaid annual fee