Signal presence detector and method

Details Signal presence detector and method Signal presence detector and method

1978-11-27

1982-12-07

Chin, Tommy P.

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

455 67, 455296, 364485, H04B 1700, H04B 110

Patent

active

043631380

ABSTRACT:
Circuitry and methods are presented for detecting the presence of a spectrally distributed signal having a known distribution, e.g. spread spectrum, in a strong noise environment. The signal is split into two channels, each filtering a predetermined frequency band within the given spectrum. The channels are tuned and balanced so that they pass differential amounts of signal energy that may be present but provide equalized noise outputs. The channels are alternately coupled to the input of an energy detector which provides a DC component responsive to the difference in the signal levels of interest, while effectively cancelling noise energy components in each channel. In the spread spectrum example the frequency bands are typically selected to the maximum and a null location in a ##EQU1## distribution.

REFERENCES:
patent: 3173087 (1965-03-01), Loposer
patent: 3737781 (1973-06-01), Deerkoski
patent: 3988679 (1976-10-01), Clarke et al.
patent: 4034299 (1977-07-01), Cho
patent: 4039953 (1977-08-01), Chadwick
patent: 4125809 (1978-11-01), Mott

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