Sine sweep optimization for room impulse response measurements

Richard, Antoine; Christensen, Claus Lynge; Koutsouris, George

doi:10.48465/fa.2020.0163

Cited by 1 publication

(2 citation statements)

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“…It is desirable that the measured impulse response has constant NNP (normalized noise power) over all frequency bands in various applications, such as reverberation time measurement, auralization, and sound field control. However the conventional adaptive measurement signals aimed at achieving this property were derived intuitively, and the theoretical background was insufficient [18,21,28].…”

Section: Discussionmentioning

confidence: 99%

“…When an SS signal is used, the nonlinear distortion causes a harmonic distortion and generates an artifact in the impulse response. However, this artifact occurs in the noncausal part of the impulse response and is separable [18,28]. Even if it cannot be separated and overlaps with the linear response, the energy is sufficiently smaller than the linear component, so the effect of the artifact on the impulse response energy decay curve (Schroeder curve) is small.…”

Section: Nonlinearitymentioning

confidence: 99%

See 1 more Smart Citation

Shortest Impulse Response Measurement Signal That Realizes Constant Normalized Noise Power in All Frequency Bands

Nakahara¹,

Iiyama²,

Ikeda³

et al. 2021

J. Audio Eng. Soc.

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It is desirable that the measured acoustic impulse response has constant normalized noise power (NNP) in all frequency bands. However the conventional measurement signals aimed at achieving this property were derived intuitively, and the theoretical background is insufficient. In this work we first theoretically derived the relational formula that the measurement signals must satisfy for the measured impulse response to have constant NNP over all frequency bands. This formula includes all the measurement signals that achieve constant NNP. We then found the shortest (equivalently, the minimum energy) measurement signal among them. We call this signal the bandwise minimum noise (BMN) signal. Experiments to measure the room impulse responses were carried out. The experimental results confirmed that the impulse responses measured by the BMN signal had almost constant NNP in all frequency bands. Also, it was confirmed that the BMN signal achieved the required NNP for reverberation time measurement with the shortest signal length as compared with the conventional measurement signals.

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Section: Discussionmentioning

confidence: 99%

Section: Nonlinearitymentioning

confidence: 99%