Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1997-08-29
2000-02-08
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327558, 327337, 327341, 327362, 327552, 333 14, 708312, H03K 500
Patent
active
060231912
ABSTRACT:
A level detector detects an input signal level. A rectifier (210) receives the input signal and provides a rectified signal. A prefilter (220) receives the rectified signal and attenuates high frequency components at frequencies near multiples of a decimation sample rate. The prefiltered signal is decimated (230) and low pass filtered by a lowpass filter (240) having a passband below the input frequency of the input signal. The level detector can be provided to control a variable gain stage circuit (935, 1010) which applies a gain to the input signal based on the level to form a dynamic range compressor or expander.
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Callicotte Mark Joseph
Connell Lawrence Edwin
Roeckner William Joseph
Juffernbruch Daniel W.
Le Dinh T.
Mancini Brian M.
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