TRANSIENT PROCESSING FOR COMMUNICATION SYSTEM

摘要

An automatic gain control for a cabin communication system improves the clarity of voice spoken within a movable interior cabin. The automatic gain control includes a microphone (102) for receiving the spoken voice and the ambient noise and for converting the spoken voice and the ambient noise into a first audio signal, the first audio signal including a first component corresponding to the spoken voice and a second component corresponding to the ambient noise, a parameter estimation processor (802 and 806) for receiving the first audio signal and for determining parameters for deciding whether or not the second component corresponds to an undersirable transient noise, decision logic for deciding (804 and 808), based on the parameters, whether or not the second component corresponds to an undersirable transient signal, a filter (300) for filtering the first audio signal to provide a filteres audio signal, a loudspeaker (104) for outputting a reproduced voice in response to the filtered audio signal with a variable gain at a second location in the cabin, and a control signal generating circuit for generating an automatic gain control signal in response to the decision logic.