Privacy communication method and apparatus using time base...

Details Privacy communication method and apparatus using time base... Privacy communication method and apparatus using time base...

H - Electricity

04

K

379/1, 325/3

H04K 1/06 (2006.01)

Patent

CA 1219914

ABSTRACT OF THE DISCLOSURE A privacy communication method is performed by transmission of a signal from a transmitter (1) to a receiver (7) with the signal kept in a privacy state. To that end, an input signal is alternately subjected to compression and expansion in terms of the time base by means of a time base compressing/expanding circuit (3), whereupon the signal is transmitted from a transmitting circuit (5) through a transmitting antenna (6). The transmitted signal is received through a receiving antenna (8) by a receiving circuit (9) and is then alternately subjected to expansion and compression in terms of the time base of the received signal by means of a time base expanding/compressing circuit (10) in synchronism with the compression and expansion on the part of the transmitter, whereby the original signal is restored.

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