A switched-capacitor preprocessor for speech recognition

Yoshihiko Horio, Shogo Nakamura, Hiroyuki Takase

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A switched-capacitor (SC) preprocessing system (preprocessor) which extracts and emphasizes the local peaks of the spectrum in real time is proposed for speech recognition systems. Main components of the system are a specially designed bandpass filter bank, a low-pass decimation filter bank, two-dimensional local peak extraction (LPE) filters, and a LPE filter selection circuit. Furthermore, a SC cascaded integrator-comb filter design technique is proposed to realize the decimation low-pass filter and the LPE filter. Finally, the system is tested by using two speech recognition systems.

Original languageEnglish
Pages (from-to)79-94
Number of pages16
JournalAnalog Integrated Circuits and Signal Processing
Issue number2
Publication statusPublished - 1992 Apr


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