SYSTEM FOR CONVERTING A VOICE SIGNAL TO A PITCH SIGNAL

摘要

A system for converting a voice signal to a pitch signal comprises a first circuit for obtaining a pulse signal having a period corresponding to peak values of an input voice signal, a second circuit for quantizing the output pulse signal of the first circuit and for generating a quantized signal, a third circuit for setting a quantized signal as a preliminary pitch signal which indicates a preliminary pitch when the same quantized signal is successively obtained from the second circuit for a predetermined number of times, and a fourth circuit supplied with the quantized signal from the second circuit and the preliminary pitch signal from the third circuit for correcting the preliminary pitch signal by raising or lowering the preliminary pitch when a pitch described by the quantized signal and the preliminary pitch are not equal to each other. The fourth circuit generates a pitch signal which indicates a pitch of the input voice signal.