Signal communication capable of avoiding an audible...

Details Signal communication capable of avoiding an audible... Signal communication capable of avoiding an audible...

H - Electricity

04

B

325/28, 354/47,

H04B 14/06 (2006.01) H04M 11/06 (2006.01)

Patent

CA 1318402

537126 Abstract of the Disclosure In a communication system for use in transmitting a sequence of information signals in addition to a sequence of digital voice signals subjected to adaptive delta modulation, the information signal sequence is modulated by a phase modulator (51) of the transmitter section (11a) into a phase modulated signal sequence and is combined with the digital signals by a combining circuit (15) into output signals. The phase modulated signals might be sent through an ADM decoder (36) and a switch (44) of a receiver section (12a) to a loudspeaker (45) to be reproduced togeter with the digital voice signals. However, such phase modulated signals are not substantially audible for listeners because the phase modulated signals scarcely comprise a low frequency component. The phase modulated signals may be binary Manchester code signals and may be either interposed in a quiescent time of the digital voice signals or placed at the end or beginning of each digital voice signal.

537126

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