Subband noise canceller with reduced residual noise for speech applications

Research output: Contribution to journalArticle

Abstract

This paper presents a subband noise canceller with improved performance. The canceller is developed by modifying and optimizing an existing multirate filter bank that is used to improve the performance of a conventional full-band adaptive filtering. The system is aimed to overcome problems of slow asymptotic convergence and high residual noise incorporating with the use of oversampled multirate filter banks for noise cancellation applications. System equation is formulated and the optimum prototype filters are derived. Prototype analysis and synthesis filters are optimized to minimize amplitude distortion. The proposed scheme offers a simplified structure that without employing cross adaptive filters or notch filtering reduces the effect of colored components near the band edge in the frequency response of the analysis prototype filter. Issues of increasing convergence speed and decreasing the residual noise at the system output are addressed. The performance under white and colored environments is evaluated in terms of mean square error MSE performance. A comparison is made with an equivalent unmodified system as well as with a conventional full-band scheme. Fast initial convergence was obtained with this modification. Also a decrease in the amount of residual noise by approximately 10dB compared to a subband model without modification was reachable under actual speech and background noise.

Original languageEnglish
Pages (from-to)45-57
Number of pages13
JournalEuropean Journal of Scientific Research
Volume30
Issue number1
Publication statusPublished - 2009

Fingerprint

Filter banks
Noise
filter
Adaptive filtering
Filter Banks
Adaptive filters
Prototype
Filter
prototypes
Mean square error
Frequency response
Noise Cancellation
Adaptive Filtering
Adaptive Filter
Asymptotic Convergence
Notch
Convergence Speed
Frequency Response
Filtering
Synthesis

Keywords

  • Adaptive Filtering
  • Multirate filter banks
  • Noise cancellation
  • Oversampled filter banks
  • Polyphase representation
  • Subband decomposition

ASJC Scopus subject areas

  • General

Cite this

Subband noise canceller with reduced residual noise for speech applications. / Noor, Ali O Abid; Abdul Samad, Salina; Hussain, Aini.

In: European Journal of Scientific Research, Vol. 30, No. 1, 2009, p. 45-57.

Research output: Contribution to journalArticle

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