A construction of pole‐deviation tracking filter
Masato Akagi, Taizo Iijima · Electronics and Communications in Japan (Part I Communications) · 1984
Abstract This paper describes a construction method for the pole‐deviation tracking filter, which is a computing system to follow the variation‐in‐time of the poles of the signal waveform. Until now, the methods such as filter‐bank, FFT and LPC, are used to track the deviation of poles, assuming the stationarity within the frame. There are some methods in nonstationary speech analysis that assume the variation within the frame. However, they have a problem in that the error may accumulate since the locations of poles are calculated after correcting the LPC coefficients. The method proposed in this paper, on the other hand, is an extension of the idea of POLPEC I, which we have proposed as a means of speech recognition. It assumes the variation within the frame, and the pole deviation is calculated directly from the waveform. By this scheme, the location of the pole is not averaged within the frame and the error does not accumulate. Neither is it necessary to solve an algebraic equation of higher order to determine the pole location. The result of simulation using synthesized waveform and the analysis of C‐V type speech also are discussed.