Pulse or digital communications – Repeaters – Testing
Patent
1981-01-12
1982-12-07
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 34, 3701104, 179 84VF, H03K 1322
Patent
active
043631274
ABSTRACT:
Statistical properties of a signal are used to distinguish between a voice signal and an "on hook" indication on a low bandwidth digital data link. Noise is intentionally added to the voice signal to guarantee a minimum power level, while not disrupting normal demodulation. A digital signal, having a known maximum power level upon demodulation, is used to represent the "on hook" condition. Upon demodulation, the minimum power level of the noise-colored voice signal is greater than the maximum power level of the "on-hook" signal, and the two signals can be distinguished by a power level threshold detector. This apparatus and technique is particularly well-suited to under-sampled, such as CVSD (continuously variable slope delta), data links, which are usually noisy and distorted. It alleviates the need for direct access to the digital link and simplifies the required hardware and retrofit modifications.
REFERENCES:
patent: 3941924 (1976-03-01), Leiboff
patent: 3999129 (1976-12-01), Kasson
patent: 4071692 (1978-01-01), Weir et al.
patent: 4122300 (1978-10-01), Busigny
patent: 4132864 (1979-01-01), Feng
patent: 4199664 (1980-04-01), Grange et al.
Buddenhagen James F.
Evans Randall G.
Chin Stephen
Ford Aerospace & Communications Corporation
Huang A.
Radlo E. J.
Safourek Benedict V.
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