Abstract: Voice processing methods and circuits use bandpass filters and energy detectors to determine the energy in frequency channels of a voice signal. A bit array having a horizontal direction corresponding to the channels and a vertical direction corresponding to time provides a representation of the voice signal that can be stored during training and compared to other bit arrays during voice recognition. One comparison method compares horizontal lines of bit arrays using a position-weighted K factor. A segmentation process divides arrays into segments to better identify corresponding lines in arrays. Corresponding lines can also be selected in segments using an alternating top-down/bottom-up best match process. When this comparison finds a matching array, the match is confirmed if match result is significantly better than a match result for a bit array corresponding to different voice command and if vertical checking confirms the match.

Abstract: A system for reducing noise coupling in a mixed-signal IC includes a digital clock, an analog clock, and gating signal generator, and a gating circuit. The gating circuit receives a digital clock signal and the gating pulse to generate a gated digital clock signal having no pulses at a sampling edge of the analog clock signal to provide a "quiet time" for analog sampling.