SYSTEM FOR EXTRACTION OF POLE PARAMETER VALUES

There is disclosed a system for the extraction of pole parameter values. The system comprises an autocorrelation value calculating circuit receiving an input voice signal through a time window, for calculating an autocorrelation value V.sub.i (i=0, 1, 2, . . .) of the input voice signal within the time window; a linear prediction coefficient memory circuit for storing linear prediction coefficients (.alpha..sub.1, .alpha..sub.2) corresponding to various pole parameter values; a signal processor for receiving as its input the output value V.sub.i of the autocorrelation value calculating circuit, performing thereon an arithmetic operation according to the following formula using the prediction coefficients (.alpha..sub.1, .alpha..sub.2) supplied by the linear prediction coefficient memory circuit: EQU r.sub.i =(l+.alpha..sub.1.sup.2 +.alpha..sub.2.sup.2)V.sub.i -(.alpha..sub.1 -.alpha..sub.1 .alpha..sub.2)V.sub.i+1 -(.alpha..sub.1 -.alpha..sub.1 .alpha..sub.2)V.sub.i-1 -.alpha..sub.2 V.sub.i-2 -.alpha..sub.2 V.sub.i+2 and delivering an output (r.sub.i) representative of an autocorrelation value of an output voice signal; an autocorrelation value temporary storage circuit for storing the output of the signal processor; a minimum value detecting circuit for detecting a minimum of the autocorrelation values stored in the storage circuit, whereby the pole parameter corresponding to the minimum autocorrelation value is extracted.