Signal communication capable of avoiding an audible reproduction

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

1987-05-18

1990-02-06

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

455 45, 3701104, H04L 2710

Patent

active

048993506

ABSTRACT:
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 together 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.

REFERENCES:
patent: 3735048 (1973-05-01), Tomsa et al.
patent: 3845391 (1974-10-01), Crosby
patent: 4131849 (1978-12-01), Freeburg et al.
patent: 4254501 (1981-03-01), Griffith et al.
patent: 4354265 (1982-10-01), Nyberg et al.
patent: 4379947 (1983-04-01), Warner
patent: 4660193 (1987-04-01), Young et al.
patent: 4689790 (1987-08-01), Lacroix et al.

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