Patent Document ID: 3989896
Application ID: 05358427
Patent Status: 1

Claim One:
1. Apparatus for tracking a spectral peak within the frequency spectrum of a spoken word wherein a spectral peak is a frequency which corresponds to a peak amplitude in the spoken word, comprising: first and second electronically tunable filter means connected to receive spoken words and produce an output signal having an adjustable center frequency and an adjustable Q characteristic, said first tunable filter means responding to the frequency content of spoken words occurring in a frequency range in a first direction from said center frequency and a second tunable filter means responding to the frequency content of spoken words occurring in the frequency range in an opposite direction, said first and second tunable filter means including control inputs to receive control input signals to adjust said center frequencies and said Q characteristics, and feedback control means connected to the outputs of said first and second tunable filter means to determine the deviation of said center frequencies from a spectral peak in said spoken word and develop a control input signal to adjust said center frequencies to establish a predetermined relationship between said center frequencies and spectral peak.