Eyes free dialing for cellular telephones

The authors describe a chip set that implements voice dialing for cellular telephones using isolated-word speaker-dependent speech-recognition algorithms. High recognition rates of over 98% in noisy car cabins are achieved using noise-immune techniques for preprocessing, feature extraction, template training, and template comparison. A unique work endpoint detector is realized with a modified dynamic time warping algorithm and a noise-robust voice-activated switch. The chip set supports up to two users and a vocabulary of 32 words. It incorporates speech synthesis for guiding, prompting, and verification by vocal feedback, and allows dialing digit by digit or speed dialing of up to 10 stored numbers invoked with user-defined phrases