Title :
A feedback control system for real-time formant estimation. I. Static and dynamic analysis for sinusoidal input signals
Author :
Zierhofer, Clemens M. ; Hochmair, Erwin S.
Author_Institution :
Inst. fuer Experimentalphysik, Innsbruck Univ., Austria
Abstract :
A scheme suitable for the real-time estimation of formant frequencies is presented. Formant tracking is based on a feedback technique which uses both the amplitude and phase characteristics of two stagger-tuned bandpass filters to give an improved dynamic behavior. The implementation of the system requires a small number of components, and is practical for low-power applications. An analysis of the static and dynamic behavior is given for sinusoidal input signals. The transient response is independent of the amplitude level of the input signal. The system is designed for second formant detection in a cochlear prosthesis system.
Keywords :
biocontrol; feedback; hearing aids; spectral analysis; speech analysis and processing; amplitude characteristics; cochlear prosthesis system; dynamic analysis; feedback control system; low-power applications; phase characteristics; real-time formant estimation; second formant detection; sinusoidal input signals; speech analysis; stagger-tuned bandpass filters; static analysis; transient response; vowel spectra; Band pass filters; Counting circuits; Digital signal processing; Feedback control; Filter bank; Frequency estimation; Independent component analysis; Prosthetics; Real time systems; Signal analysis; Speech; Transient response; Cochlear Implants; Prosthesis Design; Signal Processing, Computer-Assisted;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
