Differential microphone array is known to have low sensitivity to distant sound sources. Such characteristics may be advantageous in voice activity detection where it can be assumed that the target speaker is close and background noise sources are distant. In this paper we develop a simple modification to the EVRC rate determination algorithm (EVRC RDA) to exploit the noise-canceling property of differential microphone array to improve its performance in highly dynamic noise environment. Comprehensive computer simulations show that the modified algorithm outperforms the original EVRC RDA in all tested noise conditions.
Bibliographic reference. Widjaja, Henry / Wibowo, Suryoadhi (2009): "Application of differential microphone array for IS-127 EVRC rate determination algorithm", In INTERSPEECH-2009, 1123-1126.