why non-acoustic voiced speech sensing?
One initiative of Phase I of DARPA’s ASE program was to use noise-immune sensors in conjunction with microphone sensors in order to develop very low bit rate speech encoders. Very low bit rate speech encoding is a difficult problem in acoustically noisy environments. The speech encoder can be fooled by loud background noises and may not be able to accurately determine the key parameters of speech necessary to perform intelligable encoding. The Tuned Electromagnetic Resonator Collar (TERC) sensor, one of several non-acoustic speech sensors evaluated by the ASE program, was designed to enable this technology.
