Signal pattern encoder and classifier

Abstract

The circuit described here is used to vibrate a listener's chair. It consists of a bandpass filter tuned to cover roughly the fundamental frequency range of speech and a rectifier/low-pass combination to measure the amplitude level in the filtered band. A voice discriminator consists of a comparator that indicates when the bandpass energy is greater than a certain fraction of the overall energy. The switched and amplified low-pass portion of the signal is used to vibrate the seat of a movicgoer for heightened effects.m DLR 4,624,009 43.72.Ne SIGNAL PATTERN ENCODER AND CLASSIFIER James W. Glenn and Joseph C. Brown, assignors to Figpie International, Incorporated 18 November 1986 {Class 381/43}; filed 2 May 1980