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A switched-capacitor preprocessor for speech recognition

โœ Scribed by Yoshihiko Horio; Shogo Nakamura; Hiroyuki Takase

Publisher
Springer
Year
1992
Tongue
English
Weight
812 KB
Volume
2
Category
Article
ISSN
0925-1030

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โœฆ Synopsis

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.

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