Enhancing the performance of speech recognition with echo cancellation

The use of echo cancellation to improve speech recognition performance over telephone channels is described. Echo cancellation is shown to provide an increase of 25 dB in signal-to-noise ratio, thereby increasing recognition performance to a level which can be attained over telephone channels with no echo. A prototype system which includes the echo canceller and an isolated-word speaker-independent speech recognizer has been implemented within a single AT&T WE DSP-32.<<ETX>>