Switched-capacitor pre-processor for speech processing using SC CIC filter

Author

Horio, Yoshihiko ; Takase, Hiroyuki ; Nakamura, Shogo

Author_Institution

Dept. of Electron. Eng., Tokyo Denki Univ., Japan

fYear

1989

Firstpage

1311

Abstract

A switched-capacitor (SC) preprocessing system is proposed for analog speech processing. The preprocessor extracts the time transition pattern of the local peaks of the speech spectrum and emphasizes the peaks in real-time. A switched-capacitor cascaded integrated-comb (CIC) filter is proposed as one of the construction blocks of the preprocessor. The architecture of the preprocessor is described, and the details of some of the construction blocks are given. Local peak extraction filtering using SC CIC filters is proposed. The filter emphasizes the local peak pattern of the spectrum in the direction of the channel of the bandpass filter bank (frequency domain) and smoothes its transition pattern in the time domain. The SC CIC filter design technique is given

Keywords

band-pass filters; cascade networks; speech analysis and processing; switched capacitor filters; SC CIC filter; bandpass filter bank; extraction filtering; local peak pattern; local peaks; preprocessing system; speech processing; speech spectrum; switched-capacitor cascaded integrated-comb; time transition pattern; transition pattern; Band pass filters; CMOS technology; Channel bank filters; Distributed processing; Feature extraction; Filter bank; Low pass filters; Signal processing; Speech processing; Speech recognition;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1989., IEEE International Symposium on

Conference_Location

Portland, OR

Type

conf

DOI

10.1109/ISCAS.1989.100597

Filename

100597