Carrier squelch method and apparatus

Details Carrier squelch method and apparatus Carrier squelch method and apparatus

1997-10-31

2000-04-25

Chin, Wellington

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

455212, 455219, 455222, 455223, H04Q 714

Patent

active

060554215

ABSTRACT:
A radio receiver operates primarily in a first operating mode to process received signals (410). When a carrier signal detect is triggered while in the first operating mode (415, 420), the receiver temporarily operates in a second operating mode which has receiver parameters selected to reduce carrier detect falsing when compared to the first operating mode (430). Preferably, in the second operating mode, the receiver's frequency and time response characteristics are modified to facilitate carrier squelch detection. Carrier squelch is performed if a carrier signal detect is triggered while the receiver operates in the second operating mode (440, 450, 460, 470).

REFERENCES:
patent: 4455664 (1984-06-01), Burke
patent: 4724545 (1988-02-01), Hamada
patent: 4731873 (1988-03-01), Voyce
patent: 5151922 (1992-09-01), Weiss
patent: 5199109 (1993-03-01), Baker
patent: 5287549 (1994-02-01), Roehrs et al.
patent: 5450622 (1995-09-01), Vandegraaf
patent: 5526530 (1996-06-01), Sueoka et al.
patent: 5649321 (1997-07-01), Kellenberger
patent: 5844938 (1998-12-01), Hupp et al.

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