A portable speech signal preprocessing (SSP) device having a microphone for receiving spoken speech and background noise, a digital signal processor (DSP) for processing the received noise into feature vectors, a coupler for coupling to a communication device and for transmission over a communication...http://www.google.com.tw/patents/US6615171?utm_source=gb-gplus-share專利 US6615171 - Portable acoustic interface for remote access to automatic speech/speaker recognition server
