KR920020870A - Method for preventing eavesdropping in radiotelephone - Google Patents

Method for preventing eavesdropping in radiotelephone Download PDF

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Publication number
KR920020870A
KR920020870A KR1019910007006A KR910007006A KR920020870A KR 920020870 A KR920020870 A KR 920020870A KR 1019910007006 A KR1019910007006 A KR 1019910007006A KR 910007006 A KR910007006 A KR 910007006A KR 920020870 A KR920020870 A KR 920020870A
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KR
South Korea
Prior art keywords
transmission
unit
wireless telephone
distance
cpu
Prior art date
Application number
KR1019910007006A
Other languages
Korean (ko)
Inventor
맹현진
Original Assignee
백중영
금성통신 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 백중영, 금성통신 주식회사 filed Critical 백중영
Priority to KR1019910007006A priority Critical patent/KR920020870A/en
Publication of KR920020870A publication Critical patent/KR920020870A/en

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  • Transceivers (AREA)

Abstract

내용 없음.No content.

Description

무선전화기에서의 도청 방지 방법 및 그 장치Method for preventing eavesdropping in radiotelephone

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

제1도는 본 발명 장치의 회로도,1 is a circuit diagram of an apparatus of the present invention,

제2도는 본 발명 방법을 설명하기 위한 플로우 챠트.2 is a flow chart for explaining the method of the present invention.

Claims (4)

CPU(60)에서 검출한 결과 무선전화기가 다이얼모드 상태이면 다이얼코드를 모두 송출시킨다음 통화모드이면 통화상태를 유지시키는 무선전화기의 송.수신방법에 있어서, 통화 상태 유지중 통화 종료코드가 입력될때까지 통화거리가 1단계, 2단계 및 3단계인가를 순차적으로 검출하여 각각의 거리에 상응하도록 송신출력신호의 크기를 조절하여 송출하도록 함을 특징으로 하는 무선전화기에서의 도청방지방법.In the transmission / reception method of the wireless telephone which transmits all the dial codes when the wireless telephone is in the dial mode and detects the telephone mode when the wireless telephone is in the dial mode, when the call termination code is input while maintaining the communication status. The method for preventing eavesdropping in a wireless telephone, characterized in that it detects sequentially whether the call distance is in steps 1, 2 and 3 and adjusts the size of the transmission output signal to correspond to each distance. 송.수신버퍼부(10), 고주파증폭부(20), 중간주파증폭 및 혼합부(30), 음성증폭부(40), 데이타검출부(50), CPU(60), 송신변조부(80)및 음성신호증폭부(90)와를 구비하여서된 무선전화기에 있어서, 상기 중간주파증폭및 혼합부(30)의 출력신호를 입력받아 통화거리에 상응하는 소정신호를 CPU(60)에 입력시켜주는 통화거리 감지부(110)와, 상기 송신전력증폭부(70)에서 출력되는 고주파 송신신호를 CPU(60)의 출력신호에 따라 소정레벨로 자동조절하여 상기 송.수신 버퍼부(10)에 인가시켜주는 송신출력조절부(120)와를 개재하여 구성된 것을 특징으로 하는 무선전화기에서의 도청 방지장치.Transmission and reception buffer unit 10, high frequency amplifier 20, intermediate frequency amplifier and mixer 30, voice amplifier 40, data detector 50, CPU 60, transmission modulator 80 And a voice signal amplifying unit (90), wherein the telephone receives the output signal of the intermediate frequency amplification and mixing unit (30) and inputs a predetermined signal corresponding to a communication distance to the CPU (60). The high frequency transmission signal output from the distance detection unit 110 and the transmission power amplifier 70 is automatically adjusted to a predetermined level according to the output signal of the CPU 60 and applied to the transmission / reception buffer unit 10. Note that the wiretap prevention device in a radiotelephone, characterized in that configured via the transmission output control unit 120. 제2항에 있어서, 상기 통화거리감지부(110)는 저항(R1~R12), 콘덴서(C1~C4), 다이오드(D1~D2)및 연산증폭기(IC1, IC2)를 상호연결 구성하여서된 것을 특징으로 하는 무선전화기에서의 도청방지장치.The method of claim 2, wherein the call distance detection unit 110 is a resistor (R 1 ~ R 12 ), capacitors (C 1 ~ C 4 ), diodes (D 1 ~ D 2 ) and operational amplifiers (IC 1 , IC 2 ) Eavesdropping device in a radiotelephone, characterized in that by configuring the interconnection. 제2항에 있어서, 상기 송신출력조절부(120)는 저항(R13, R14)과 아날로그스위치(SW1, SW2)를 상호연결 구성하여서된 것을 특징으로 하는 무선전화기에서의 도청방지장치.The apparatus of claim 2, wherein the transmission output control unit (120) is configured by interconnecting resistors (R 13 , R 14 ) and analog switches (SW 1 , SW 2 ). . ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019910007006A 1991-04-30 1991-04-30 Method for preventing eavesdropping in radiotelephone KR920020870A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019910007006A KR920020870A (en) 1991-04-30 1991-04-30 Method for preventing eavesdropping in radiotelephone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019910007006A KR920020870A (en) 1991-04-30 1991-04-30 Method for preventing eavesdropping in radiotelephone

Publications (1)

Publication Number Publication Date
KR920020870A true KR920020870A (en) 1992-11-21

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Application Number Title Priority Date Filing Date
KR1019910007006A KR920020870A (en) 1991-04-30 1991-04-30 Method for preventing eavesdropping in radiotelephone

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KR (1) KR920020870A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101229358B1 (en) * 2006-06-27 2013-02-05 엘지전자 주식회사 Mobile terminal and method for preventing wiretap thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101229358B1 (en) * 2006-06-27 2013-02-05 엘지전자 주식회사 Mobile terminal and method for preventing wiretap thereof

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