发明名称 |
SIGNAL CONDITIONING CIRCUIT FOR COMPRESSING AUDIO SIGNALS |
摘要 |
A signal conditioning circuit (10) compresses an audio signal by producing a gain signal (Vc) that is a function of the time-averaged audio signal and a compression ratio, and amplifying the audio signal by an exponential function of the gain signal. The conditioning circuit merges the functions of buffering the audio signal and producing a full-wave rectified version of the audio signal into a single buffer circuit (12). An averaging circuit (14) generates a time-averaged signal in response to the full-wave rectified signal. An interface circuit (16) includes downward expansion (60), compression (58) and limiting (59) circuits for scaling the time-averaged signal with a low compression ratio when it is less than a break point, with a selected compression ratio when it is between the break point and a rotation point, and with a high compression ratio when it exceeds the rotation point.
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申请公布号 |
WO9639744(A1) |
申请公布日期 |
1996.12.12 |
申请号 |
WO1995US11078 |
申请日期 |
1995.08.31 |
申请人 |
ANALOG DEVICES, INC. (ADI) |
发明人 |
FREY, DOUGLAS, R.;COPLEY, PATRICK |
分类号 |
H03G7/00;H03G7/06;(IPC1-7):H03G7/00 |
主分类号 |
H03G7/00 |
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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