The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Neste artigo, propomos um cancelador de uivos baseado em distância com alta qualidade de fala. Desenvolvemos um cancelador de uivos baseado em distância que utiliza apenas informações de distância, observando a propriedade de que o uivo ocorre de acordo com a distância entre um alto-falante e um microfone. Este método estima a distância transmitindo um sinal piloto do alto-falante para o microfone. Múltiplos candidatos de frequência para cada uivo são calculados a partir da distância estimada e eliminados por filtros de entalhe em cascata que possuem nulos. No entanto, ocorre degradação da qualidade da fala na saída do cancelador uivante. A primeira causa é a ocorrência de ruído de disparo no início e no final da transmissão do sinal piloto devido à mudança descontínua da amplitude. Desenvolvemos assim um novo sinal piloto que é robusto contra ruídos ambientais. Podemos então reduzir o efeito do ruído do disparo diminuindo a amplitude. O segundo é uma degradação da fala causada pela sobreposição de bandas de parada dos filtros notch. Assim, derivamos uma condição para as larguras de banda para que as bandas de parada não se sobreponham e propomos um esquema de largura de banda adaptativo que altera a largura de banda de acordo com a distância.
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Akira SOGAMI, Arata KAWAMURA, Youji IIGUNI, "Improvement of Speech Quality in Distance-Based Howling Canceller" in IEICE TRANSACTIONS on Fundamentals,
vol. E92-A, no. 4, pp. 1039-1046, April 2009, doi: 10.1587/transfun.E92.A.1039.
Abstract: In this paper, we propose a distance-based howling canceller with high speech quality. We have developed a distance-based howling canceller that uses only distance information by noticing the property that howling occurs according to the distance between a loudspeaker and a microphone. This method estimates the distance by transmitting a pilot signal from the loudspeaker to the microphone. Multiple frequency candidates for each howling are computed from the estimated distance and eliminated by cascading notch filters that have nulls at them. However degradation of speech quality occurs at the howling canceller output. The first cause is a shot noise occurrence at the beginning and end of the pilot signal transmission due to the discontinuous change of the amplitude. We thus develop a new pilot signal that is robust against ambient noises. We can then reduce the shot noise effect by taking the amplitude small. The second one is a speech degradation caused from overlapped stopbands of the notch filters. We thus derive a condition on the bandwidths so that stopbands do not overlap, and propose an adaptive bandwidth scheme which changes the bandwidth according to the distance.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/transfun.E92.A.1039/_p
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@ARTICLE{e92-a_4_1039,
author={Akira SOGAMI, Arata KAWAMURA, Youji IIGUNI, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Improvement of Speech Quality in Distance-Based Howling Canceller},
year={2009},
volume={E92-A},
number={4},
pages={1039-1046},
abstract={In this paper, we propose a distance-based howling canceller with high speech quality. We have developed a distance-based howling canceller that uses only distance information by noticing the property that howling occurs according to the distance between a loudspeaker and a microphone. This method estimates the distance by transmitting a pilot signal from the loudspeaker to the microphone. Multiple frequency candidates for each howling are computed from the estimated distance and eliminated by cascading notch filters that have nulls at them. However degradation of speech quality occurs at the howling canceller output. The first cause is a shot noise occurrence at the beginning and end of the pilot signal transmission due to the discontinuous change of the amplitude. We thus develop a new pilot signal that is robust against ambient noises. We can then reduce the shot noise effect by taking the amplitude small. The second one is a speech degradation caused from overlapped stopbands of the notch filters. We thus derive a condition on the bandwidths so that stopbands do not overlap, and propose an adaptive bandwidth scheme which changes the bandwidth according to the distance.},
keywords={},
doi={10.1587/transfun.E92.A.1039},
ISSN={1745-1337},
month={April},}
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TY - JOUR
TI - Improvement of Speech Quality in Distance-Based Howling Canceller
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1039
EP - 1046
AU - Akira SOGAMI
AU - Arata KAWAMURA
AU - Youji IIGUNI
PY - 2009
DO - 10.1587/transfun.E92.A.1039
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E92-A
IS - 4
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - April 2009
AB - In this paper, we propose a distance-based howling canceller with high speech quality. We have developed a distance-based howling canceller that uses only distance information by noticing the property that howling occurs according to the distance between a loudspeaker and a microphone. This method estimates the distance by transmitting a pilot signal from the loudspeaker to the microphone. Multiple frequency candidates for each howling are computed from the estimated distance and eliminated by cascading notch filters that have nulls at them. However degradation of speech quality occurs at the howling canceller output. The first cause is a shot noise occurrence at the beginning and end of the pilot signal transmission due to the discontinuous change of the amplitude. We thus develop a new pilot signal that is robust against ambient noises. We can then reduce the shot noise effect by taking the amplitude small. The second one is a speech degradation caused from overlapped stopbands of the notch filters. We thus derive a condition on the bandwidths so that stopbands do not overlap, and propose an adaptive bandwidth scheme which changes the bandwidth according to the distance.
ER -