A High Speech Quality Distance-Based Howling Canceller with Adaptive Cascade Notch Filter and Silent Pilot Signal
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概要
- 論文の詳細を見る
We have previously proposed a howling canceller which cancels howling by using a cascade notch filter designed from a distance between a loudspeaker and a microphone. This method utilizes a pilot signal to estimate the distance. In this paper, we introduce two methods into the distance-based howling canceller to improve speech quality. The first one is an adaptive cascade notch filter which adaptively adjusts the nulls to eliminate howling and to keep speech components. The second one is a silent pilot signal whose frequencies exist in the ultrasonic band, and it is inaudible while on transmission. We implement the proposed howling canceller on a DSP to evaluate its capability. The experimental results show that the proposed howling canceller improves speech quality in comparison to the conventional one.
- 2011-11-01
著者
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Kawamura Arata
Osaka Univ. Osaka Jpn
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Kawamura Arata
Graduate School Of Engineering Science Osaka University
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SOGAMI Akira
Graduate School of Engineering Science, Osaka University
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Sogami Akira
Graduate School Of Engineering Science Osaka University
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Iiguni Youji
Osaka Univ. Toyonaka‐shi Jpn
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Iiguni Youji
Graduate School Of Engineering Science Osaka University
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Kawamura Arata
Department Of Systems Innovation Graduate School Of Engineering Science Osaka University
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