Limitations caused by distortion in room impulse response measurements by swept sine technique

Branko Stojic, Dejan Ciric, Milos Markovic

Publikation: Bidrag til tidsskriftKonferenceabstrakt i tidsskriftForskningpeer review

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Resumé

The significance of a room impulse response implies the requirement that its measurement should have a high level of accuracy in certain applications. One of the common problems in a measurement process is nonlinearity leading to the distortion of a room impulse response. Limitations caused by the distortion in room impulse response measurements by swept sine technique are analyzed here by the simulations and measurements. For the investigation, both linear and exponential swept sines are used as an excitation signal. In the simulations, this signal is modified by the nonlinearity model in the time domain with or without memory. On the other hand, the distortion in measurements is achieved either by applying the nonlinearity model or by using higher excitation level and a loudspeaker with a highly nonlinear characteristic. The results show that the most of distortion energy is located in the non-causal part of the extracted impulse response. In this way, the distortion products can be separated from the linear response. However, a part of the distortion energy remains in the causal part of room impulse response. As a consequence, in the case where distortion is present, the dynamic range of a measured response can be limited in a similar way as in maximum length sequence technique, although the saturation level (maximum dynamic range) is higher for swept sine technique. Thus, swept sine technique is also vulnerable to a certain extent to distortion that limits the quality of measured impulse response.
OriginalsprogEngelsk
TidsskriftAcustica United with Acta Acustica
Vol/bind97
Udgave nummerSupplement 1
Sider (fra-til)S 119
ISSN1610-1928
StatusUdgivet - 2011
BegivenhedForum Acusticum 2011 - Aalborg, Danmark
Varighed: 27 jun. 20111 jul. 2011
Konferencens nummer: 6

Konference

KonferenceForum Acusticum 2011
Nummer6
LandDanmark
ByAalborg
Periode27/06/201101/07/2011

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rooms
impulses
nonlinearity
dynamic range
Impulse
loudspeakers
excitation
simulation
saturation
requirements
energy
products
Nonlinearity

Citer dette

Stojic, Branko ; Ciric, Dejan ; Markovic, Milos. / Limitations caused by distortion in room impulse response measurements by swept sine technique. I: Acustica United with Acta Acustica. 2011 ; Bind 97, Nr. Supplement 1. s. S 119.
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Limitations caused by distortion in room impulse response measurements by swept sine technique. / Stojic, Branko; Ciric, Dejan; Markovic, Milos.

I: Acustica United with Acta Acustica, Bind 97, Nr. Supplement 1, 2011, s. S 119.

Publikation: Bidrag til tidsskriftKonferenceabstrakt i tidsskriftForskningpeer review

TY - ABST

T1 - Limitations caused by distortion in room impulse response measurements by swept sine technique

AU - Stojic, Branko

AU - Ciric, Dejan

AU - Markovic, Milos

PY - 2011

Y1 - 2011

N2 - The significance of a room impulse response implies the requirement that its measurement should have a high level of accuracy in certain applications. One of the common problems in a measurement process is nonlinearity leading to the distortion of a room impulse response. Limitations caused by the distortion in room impulse response measurements by swept sine technique are analyzed here by the simulations and measurements. For the investigation, both linear and exponential swept sines are used as an excitation signal. In the simulations, this signal is modified by the nonlinearity model in the time domain with or without memory. On the other hand, the distortion in measurements is achieved either by applying the nonlinearity model or by using higher excitation level and a loudspeaker with a highly nonlinear characteristic. The results show that the most of distortion energy is located in the non-causal part of the extracted impulse response. In this way, the distortion products can be separated from the linear response. However, a part of the distortion energy remains in the causal part of room impulse response. As a consequence, in the case where distortion is present, the dynamic range of a measured response can be limited in a similar way as in maximum length sequence technique, although the saturation level (maximum dynamic range) is higher for swept sine technique. Thus, swept sine technique is also vulnerable to a certain extent to distortion that limits the quality of measured impulse response.

AB - The significance of a room impulse response implies the requirement that its measurement should have a high level of accuracy in certain applications. One of the common problems in a measurement process is nonlinearity leading to the distortion of a room impulse response. Limitations caused by the distortion in room impulse response measurements by swept sine technique are analyzed here by the simulations and measurements. For the investigation, both linear and exponential swept sines are used as an excitation signal. In the simulations, this signal is modified by the nonlinearity model in the time domain with or without memory. On the other hand, the distortion in measurements is achieved either by applying the nonlinearity model or by using higher excitation level and a loudspeaker with a highly nonlinear characteristic. The results show that the most of distortion energy is located in the non-causal part of the extracted impulse response. In this way, the distortion products can be separated from the linear response. However, a part of the distortion energy remains in the causal part of room impulse response. As a consequence, in the case where distortion is present, the dynamic range of a measured response can be limited in a similar way as in maximum length sequence technique, although the saturation level (maximum dynamic range) is higher for swept sine technique. Thus, swept sine technique is also vulnerable to a certain extent to distortion that limits the quality of measured impulse response.

M3 - Conference abstract in journal

VL - 97

SP - S 119

JO - Acustica United with Acta Acustica

JF - Acustica United with Acta Acustica

SN - 1610-1928

IS - Supplement 1

ER -