发明名称 |
Method and apparatus for detecting and input signal level |
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 |
ZA9408521(B) |
申请公布日期 |
1995.06.26 |
申请号 |
ZA19940008521 |
申请日期 |
1994.10.28 |
申请人 |
MOTOROLA, INC. |
发明人 |
LAWRENCE EDWIN CONNELL;MARK JOSEPH CALLICOTTE;WILLIAM JOSEPH ROECKNER |
分类号 |
G01R19/00;H03D1/00;H03G7/00;H03G7/08;H03H19/00 |
主分类号 |
G01R19/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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