PLP coefficients can be quantized at 400 bps

Previous work in wireless speech recognition has focused on two methods, namely, quantizing recognition features (e.g. MFCC) or performing recognition using speech coding parameters (e.g. LPC). All of this previous research assumes that the communication channel is only large enough to transmit either speech coding parameters or speech recognition parameters. By contrast, we propose that the speech recognition parameters can be quantized at a rate sufficiently low to allow transmission of both speech coding and speech recognition parameters over a standard cellular channel. In particular, the paper shows that the perceptual LPC (PLP) coefficients can be transmitted at 400 bps with an insignificant loss of digit recognition accuracy