Method and apparatus for detecting an input signal
摘要
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.
申请公布号
US6023191(A)
申请公布日期
2000.02.08
申请号
US19970920369
申请日期
1997.08.29
申请人
CONNELL, LAWRENCE EDWIN;CALLICOTTE, MARK JOSEPH;ROECKNER, WILLIAM JOSEPH
发明人
CONNELL, LAWRENCE EDWIN;CALLICOTTE, MARK JOSEPH;ROECKNER, WILLIAM JOSEPH