Abstract
In this paper, a complete speakerphone is implemented with an AT&T WE DSP16A microprocessor. This single chip implementation has the advantage of low cost and hence can be applied to the speakerphone installed in a small conference room or a hands‐free cellular phone. A robust speech detector is developed to classify four different operation modes; a corresponding gain regulation algorithm is then applied to guarantee the stability of local acoustic and electronic loop. More specifically, it reduces signal levels on both channels when in idle mode, freezes acoustic (or line) echo canceler during the transmit (or receive) mode, and freezes both echo cancelers when double talk mode occurs. The performance of the system is evaluated by computer simulation and tested by real time experiment.
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