Method and apparatus for determining audio band energy of a sque

Details Method and apparatus for determining audio band energy of a sque Method and apparatus for determining audio band energy of a sque

1995-05-05

1997-07-15

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

455212, 455213, H04B 110

Patent

active

056493215

ABSTRACT:
A squelch circuit (111) that is contained in an communications receiver (100) estimates (403, 405) the energy of an input signal in an audio band and in a first portion of the audio band. The squelch circuit (111) then determines (407) whether the energy in the first portion of the audio band is at least a predetermined proportion of the total energy in the audio band. When the energy in the first portion of the audio band is at least a predetermined proportion of the total energy in the audio band, the squelch circuit increases (409) the audio band energy estimate to produce an updated audio energy estimate. The squelch circuit (111) can then use the updated audio energy estimate to adjust (413) a so-called squelch threshold that is subsequently used to determine (419) the presence of the radio frequency signal at an input (101) to the communications receiver (100).

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patent: 5355530 (1994-10-01), Ikeda
patent: 5398286 (1995-03-01), Balestri et al.
patent: 5408694 (1995-04-01), Tran

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