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A Warped Low Delay Filter for Speech Enhancement
- Author(s)
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- Heinrich Löllmann, (RWTH Aachen University)
- Peter Vary, (RWTH Aachen University)
- Topics
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- Multirate filter banks and subband systems
- Adaptive filtering algorithms and structures for echo and noise control
- Noise reduction techniques
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Abstract
Warped analysis-synthesis filter-banks with Bark-scaled frequency
bands are used for speech enhancement systems to improve the
subjective speech quality. In this contribution, an alternative
warped filter(-bank) structure is proposed which has a
significantly lower signal delay and algorithmic complexity. The
warped moving-average low delay filter allows to decrease the
signal delay in a simple and flexible manner. The warped
auto-regressive low delay filter has minimum phase property and
can achieve a delay of only a few samples. The application to
speech enhancement shows that a similar subjective quality for the
enhanced speech can be achieved as by means of a warped
analysis-synthesis filter-bank.
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