| 摘要 |
A microphone circuit has a clip detection circuit (30) which detects when an analogue to digital converter (ADC,12) output has reached a threshold. A variable attenuator (34a,34b,34c,34d), preferably in the form of a variable input load associated with the microphone (11), is controlled based on the clip detection circuit output. The feedback is thus based on the ADC output level, and the processing of this signal can be implemented without requiring baseband processing of the signal - it can simply be based on a state of the ADC output. |
