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
Propomos uma nova metodologia de estimativa de DOA (direção de chegada) denominada SPIRE (Stepwise Phase dIfference REstoration) que é capaz de estimar direções de fontes sonoras mesmo que haja mais de uma fonte em um ambiente reverberante. A estimativa de DOA em ambientes reverberantes é difícil porque a variância da direção de uma fonte sonora estimada aumenta em ambientes reverberantes. Portanto, queremos que a distância entre os microfones seja longa. No entanto, devido ao problema de aliasing espacial, a distância não pode ser superior a metade do comprimento de onda da frequência máxima de uma fonte. O desempenho da estimativa DOA do SPIRE não é limitado pelo problema de aliasing espacial. A principal característica do SPIRE é a restauração da diferença de fase de um par de microfones (M1) usando a diferença de fase de outro par de microfones (M2) sob a condição de que a distância entre os microfones M1 seja maior que a distância entre os microfones M2. Este processo de restauração permite a redução da variância de uma direção estimada da fonte sonora e pode aliviar o problema de aliasing espacial que ocorre com a diferença de fase M1 usando a estimativa de direção dos microfones M2. Os resultados experimentais em ambiente reverberante (tempo de reverberação = cerca de 300 ms) indicam que mesmo quando existem múltiplas fontes, o método proposto pode estimar a direção da fonte com mais precisão do que os métodos convencionais. Além disso, o desempenho de estimativa DOA do SPIRE com o comprimento do array de 0.2 m é quase equivalente ao do GCC-PHAT com o comprimento do array de 0.5 m. O SPIRE pode executar estimativas DOA com um conjunto de microfones menor que o GCC-PHAT. Do ponto de vista do tamanho do hardware e do problema de coerência, o comprimento do array deve ser o menor possível. Este recurso do SPIRE é preferível.
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Masahito TOGAMI, Yasunari OBUCHI, "Stepwise Phase Difference Restoration Method for DOA Estimation of Multiple Sources" in IEICE TRANSACTIONS on Fundamentals,
vol. E91-A, no. 11, pp. 3269-3281, November 2008, doi: 10.1093/ietfec/e91-a.11.3269.
Abstract: We propose a new methodology of DOA (direction of arrival) estimation named SPIRE (Stepwise Phase dIfference REstoration) that is able to estimate sound source directions even if there is more than one source in a reverberant environment. DOA estimation in reverberant environments is difficult because the variance of the direction of an estimated sound source increases in reverberant environments. Therefore, we want the distance between microphones to be long. However, because of the spatial aliasing problem, the distance cannot be longer than half the wavelength of the maximum frequency of a source. DOA estimation performance of SPIRE is not limited by the spatial aliasing problem. The major feature of SPIRE is restoration of the phase difference of a microphone pair (M1) by using the phase difference of another microphone pair (M2) under the condition that the distance between the M1 microphones is longer than the distance between the M2 microphones. This restoration process enables the reduction of the variance of an estimated sound source direction and can alleviates the spatial aliasing problem that occurs with the M1 phase difference using direction estimation of the M2 microphones. The experimental results in a reverberant environment (reverberation time = about 300 ms) indicate that even when there are multiple sources, the proposed method can estimate the source direction more accurately than conventional methods. In addition, DOA estimation performance of SPIRE with the array length 0.2 m is shown to be almost equivalent to that of GCC-PHAT with the array length 0.5 m. SPIRE can executes DOA estimation with a smaller microphone array than GCC-PHAT. From the viewpoint of the hardware size and coherence problem, the array length is required to be as small as possible. This feature of SPIRE is preferable.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1093/ietfec/e91-a.11.3269/_p
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@ARTICLE{e91-a_11_3269,
author={Masahito TOGAMI, Yasunari OBUCHI, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Stepwise Phase Difference Restoration Method for DOA Estimation of Multiple Sources},
year={2008},
volume={E91-A},
number={11},
pages={3269-3281},
abstract={We propose a new methodology of DOA (direction of arrival) estimation named SPIRE (Stepwise Phase dIfference REstoration) that is able to estimate sound source directions even if there is more than one source in a reverberant environment. DOA estimation in reverberant environments is difficult because the variance of the direction of an estimated sound source increases in reverberant environments. Therefore, we want the distance between microphones to be long. However, because of the spatial aliasing problem, the distance cannot be longer than half the wavelength of the maximum frequency of a source. DOA estimation performance of SPIRE is not limited by the spatial aliasing problem. The major feature of SPIRE is restoration of the phase difference of a microphone pair (M1) by using the phase difference of another microphone pair (M2) under the condition that the distance between the M1 microphones is longer than the distance between the M2 microphones. This restoration process enables the reduction of the variance of an estimated sound source direction and can alleviates the spatial aliasing problem that occurs with the M1 phase difference using direction estimation of the M2 microphones. The experimental results in a reverberant environment (reverberation time = about 300 ms) indicate that even when there are multiple sources, the proposed method can estimate the source direction more accurately than conventional methods. In addition, DOA estimation performance of SPIRE with the array length 0.2 m is shown to be almost equivalent to that of GCC-PHAT with the array length 0.5 m. SPIRE can executes DOA estimation with a smaller microphone array than GCC-PHAT. From the viewpoint of the hardware size and coherence problem, the array length is required to be as small as possible. This feature of SPIRE is preferable.},
keywords={},
doi={10.1093/ietfec/e91-a.11.3269},
ISSN={1745-1337},
month={November},}
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TY - JOUR
TI - Stepwise Phase Difference Restoration Method for DOA Estimation of Multiple Sources
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 3269
EP - 3281
AU - Masahito TOGAMI
AU - Yasunari OBUCHI
PY - 2008
DO - 10.1093/ietfec/e91-a.11.3269
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E91-A
IS - 11
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - November 2008
AB - We propose a new methodology of DOA (direction of arrival) estimation named SPIRE (Stepwise Phase dIfference REstoration) that is able to estimate sound source directions even if there is more than one source in a reverberant environment. DOA estimation in reverberant environments is difficult because the variance of the direction of an estimated sound source increases in reverberant environments. Therefore, we want the distance between microphones to be long. However, because of the spatial aliasing problem, the distance cannot be longer than half the wavelength of the maximum frequency of a source. DOA estimation performance of SPIRE is not limited by the spatial aliasing problem. The major feature of SPIRE is restoration of the phase difference of a microphone pair (M1) by using the phase difference of another microphone pair (M2) under the condition that the distance between the M1 microphones is longer than the distance between the M2 microphones. This restoration process enables the reduction of the variance of an estimated sound source direction and can alleviates the spatial aliasing problem that occurs with the M1 phase difference using direction estimation of the M2 microphones. The experimental results in a reverberant environment (reverberation time = about 300 ms) indicate that even when there are multiple sources, the proposed method can estimate the source direction more accurately than conventional methods. In addition, DOA estimation performance of SPIRE with the array length 0.2 m is shown to be almost equivalent to that of GCC-PHAT with the array length 0.5 m. SPIRE can executes DOA estimation with a smaller microphone array than GCC-PHAT. From the viewpoint of the hardware size and coherence problem, the array length is required to be as small as possible. This feature of SPIRE is preferable.
ER -