Automatic Detection and Enhancement of Speech Signals.

摘要

The objective of the work described in this report was to make it less tiring to monitor speech at low signal-to-noise ratios over long periods of time. Two approaches to reducing auditory fatigue were studied: (1) automatic detection of speech and (2) automatic enhancement of the S/N of speech. The first approach was aimed at reducing the amount of time spent in simply listening for speech to occur. After examining several methods of detecting speech,the authors selected a method that intrinsically is independent of the spectrum characteristics of the communication channel or tape being monitored,of the speech characteristics of the talker,and of the language. The technique proved to be capable of detecting speech in wideband noise at an S/N of -6dB. Its major disadvantage appears to be that the complexity of the required computations demands the use of a computer to implement the method.