A Recursive Adaptive Method of Impulse Response Measurement with Constant SNR over Target Frequency Band
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H. Ochiai, and Y. Kaneda, "A Recursive Adaptive Method of Impulse Response Measurement with Constant SNR over Target Frequency Band," J. Audio Eng. Soc., vol. 61, no. 9, pp. 647-655, (2013 September.). doi:
H. Ochiai, and Y. Kaneda, "A Recursive Adaptive Method of Impulse Response Measurement with Constant SNR over Target Frequency Band," J. Audio Eng. Soc., vol. 61 Issue 9 pp. 647-655, (2013 September.). doi:
Abstract: Although an impulse response is the output from a linear system when excited by a pulse, such responses cannot be obtained with a high signal-to-noise ratio (SNR) because the pulse has low energy. Swept sine signals and maximum length sequences are alternative inputs, however, conventional signals still have low SNR problems in some frequency bands. This study is based on a swept-sine that maintains a constant SNR regardless of the frequency. The spectrum of a measurement signal is shaped, adapting to not only the background noise spectrum but also the recursively estimated transfer function of the system itself. To verify the validity of the proposed method, the authors measured the room impulse response in a noisy environment and calculated the room frequency response. The experimental result showed that a frequency response with an almost constant SNR was obtained with two iterations. This approach is useful in reverberation time measurements.
@article{ochiai2013a,
author={ochiai, hirokazu and kaneda, yutaka},
journal={journal of the audio engineering society},
title={a recursive adaptive method of impulse response measurement with constant snr over target frequency band},
year={2013},
volume={61},
number={9},
pages={647-655},
doi={},
month={september},}
@article{ochiai2013a,
author={ochiai, hirokazu and kaneda, yutaka},
journal={journal of the audio engineering society},
title={a recursive adaptive method of impulse response measurement with constant snr over target frequency band},
year={2013},
volume={61},
number={9},
pages={647-655},
doi={},
month={september},
abstract={although an impulse response is the output from a linear system when excited by a pulse, such responses cannot be obtained with a high signal-to-noise ratio (snr) because the pulse has low energy. swept sine signals and maximum length sequences are alternative inputs, however, conventional signals still have low snr problems in some frequency bands. this study is based on a swept-sine that maintains a constant snr regardless of the frequency. the spectrum of a measurement signal is shaped, adapting to not only the background noise spectrum but also the recursively estimated transfer function of the system itself. to verify the validity of the proposed method, the authors measured the room impulse response in a noisy environment and calculated the room frequency response. the experimental result showed that a frequency response with an almost constant snr was obtained with two iterations. this approach is useful in reverberation time measurements.},}
TY - paper
TI - A Recursive Adaptive Method of Impulse Response Measurement with Constant SNR over Target Frequency Band
SP - 647
EP - 655
AU - Ochiai, Hirokazu
AU - Kaneda, Yutaka
PY - 2013
JO - Journal of the Audio Engineering Society
IS - 9
VO - 61
VL - 61
Y1 - September 2013
TY - paper
TI - A Recursive Adaptive Method of Impulse Response Measurement with Constant SNR over Target Frequency Band
SP - 647
EP - 655
AU - Ochiai, Hirokazu
AU - Kaneda, Yutaka
PY - 2013
JO - Journal of the Audio Engineering Society
IS - 9
VO - 61
VL - 61
Y1 - September 2013
AB - Although an impulse response is the output from a linear system when excited by a pulse, such responses cannot be obtained with a high signal-to-noise ratio (SNR) because the pulse has low energy. Swept sine signals and maximum length sequences are alternative inputs, however, conventional signals still have low SNR problems in some frequency bands. This study is based on a swept-sine that maintains a constant SNR regardless of the frequency. The spectrum of a measurement signal is shaped, adapting to not only the background noise spectrum but also the recursively estimated transfer function of the system itself. To verify the validity of the proposed method, the authors measured the room impulse response in a noisy environment and calculated the room frequency response. The experimental result showed that a frequency response with an almost constant SNR was obtained with two iterations. This approach is useful in reverberation time measurements.
Although an impulse response is the output from a linear system when excited by a pulse, such responses cannot be obtained with a high signal-to-noise ratio (SNR) because the pulse has low energy. Swept sine signals and maximum length sequences are alternative inputs, however, conventional signals still have low SNR problems in some frequency bands. This study is based on a swept-sine that maintains a constant SNR regardless of the frequency. The spectrum of a measurement signal is shaped, adapting to not only the background noise spectrum but also the recursively estimated transfer function of the system itself. To verify the validity of the proposed method, the authors measured the room impulse response in a noisy environment and calculated the room frequency response. The experimental result showed that a frequency response with an almost constant SNR was obtained with two iterations. This approach is useful in reverberation time measurements.
