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WIRETAPPING PREVENTING METHOD FOR CORDLESS TELEPHONE SET AND CORDLESS TELEPHONE SET APPLIED WITH THE SAME METHOD
WIRETAPPING PREVENTING METHOD FOR CORDLESS TELEPHONE SET AND CORDLESS TELEPHONE SET APPLIED WITH THE SAME METHOD
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机译:无绳电话机的防写方法及应用相同方法的无绳电话机
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摘要
PURPOSE: To obtain the wiretapping preventing method for the cordless telephone set and the cordless telephone set applied with the method. ;CONSTITUTION: The cordless telephone set consists of a fixed unit 11 which is connected to a telephone line and a slave unit 6 which performs radio transmission to and reception from the fixed unit 11. In addition to circuits 5 and 7 for radio transmission and reception, the slave unit 6 and fixed unit 11 have ciphering and deciphering circuits 4 and 8 for multi-mode cipher which cipher and send out a speech signal to the transmitting and receiving circuits 5 and 7 and decipher the ciphered signal received by the transmitting and receiving circuits and mode setting circuits 3 and 9 which selectively set a mode of cipher to be used according to a user's indication.;COPYRIGHT: (C)1994,JPO
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