KR970055913A

KR970055913A - Prevention of eavesdropping in wireless telephone systems

Info

Publication number: KR970055913A
Application number: KR1019950056359A
Authority: KR
Inventors: 홍충선
Original assignee: 배순훈; 대우전자 주식회사
Priority date: 1995-12-26
Filing date: 1995-12-26
Publication date: 1997-07-31

Abstract

본 발명은 메모리소자에 복수의 그룹별로 복수개의 변/복조주파수채널을 미리 설정해 두고서 통화개시가 되어 임의의 그룹이 선정되면 그 그룹내의 변조주파수채널을 순차적으로 절환시키되 송신시간을 랜덤하게 하여 음성신호를 송신하고 베이스장치측에는 수신된 신호를 해당 복조주파수채널로 복조하여 출력함으로써 도청방지의 효율을 극대화하도록 한 무선전화시스템의 도청방지방법을 제공하기 위한 것이다.According to the present invention, when a plurality of modulation / demodulation frequency channels are set in advance in a plurality of groups in a memory device and a call is started, a random group is selected, and the modulation frequency channels in the group are sequentially switched, but the transmission time is randomized. The present invention provides a method for preventing eavesdropping in a radiotelephone system for maximizing the effectiveness of eavesdropping by demodulating and transmitting the received signal to a corresponding demodulation frequency channel.

이를 위해 본 발명은, 베이스장치와 무선전화기 핸드세트으로 이루어진 무선전화시스템에서, 통화가 개시되면 기저장된 복수의 그룹중에서 선택된 어느 한 그룹내의 복수의 변조주파수채널을 순차적으로 절환시키면서 음성변조 후 송신시키되 그 송신시간을 상호 가변되도록 하고, 통화종료신호의 입력여부 및 그룹변경신호의 입력여부에 따라 상기 음성변조/송신동작을 반복수행하는 송신시의 과정과; 통화개시가 행해지면 수신되는 변조신호에서 현재의 그룹 및 주파수채널을 검출하여 기저장된 해당 그룹의 복조주파수채널에 의해 복조출력시키고, 통화종료신호의 입력여부에 따라 상기 신호복조/출력동작을 반복수행하는 수신시의 과정으로 구성된 것이다.To this end, the present invention, in the radiotelephone system consisting of the base unit and the radiotelephone handset, when the call is initiated, after the voice modulation is transmitted while sequentially switching a plurality of modulation frequency channels in any one group selected from a plurality of previously stored groups, A transmission process for varying the transmission time, and repeatedly performing the voice modulation / transmission operation according to whether the call termination signal is input and the group change signal is input; When the call is initiated, the current group and frequency channel are detected from the received modulated signal, demodulated and output by the pre-stored demodulation frequency channel, and the signal demodulation / output operation is repeatedly performed depending on whether the call termination signal is input. It consists of the process of receiving.

Description

How to prevent eavesdropping on wireless telephone systems

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

제1도는 본 발명의 실시예로써 채용되는 무선전화시스쳄의 도청방지장치의 블럭구성도.1 is a block diagram of a wiretap prevention apparatus of a wireless telephone system employed as an embodiment of the present invention.

Claims

In a radiotelephone system comprising a base device and a radiotelephone hand cell, when a call is initiated, a plurality of modulation frequency channels in a group selected from a plurality of prestored groups are sequentially switched and then transmitted after voice modulation, but the transmission time is mutually interchangeable. A transmission process for varying and repeatedly performing the voice modulation / transmission operation according to whether or not a call termination signal is input and a group change signal is input; When the call is initiated, the current group and frequency channel are detected from the received modulated signal, demodulated and output by the pre-stored demodulation frequency channel, and the signal demodulation / output operation is repeatedly performed depending on whether the call termination signal is input. Eavesdropping method of a wireless telephone system, characterized in that consisting of a process at the time of reception.

※ Note: The disclosure is based on the initial application.