Relation between Direction-of-Arrival distribution of reflected sounds in late reverberation and room characteristics: Geometrical acoustics investigation

Izumi, Yuto; Otani, Makoto

doi:10.1016/j.apacoust.2020.107805

Cited by 7 publications

(4 citation statements)

References 12 publications

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“…In Sect. 6.2, the 2-norm isotropy indicator is applied to some RIRs [17] in order to demonstrate the usefulness and limitations of the indicator.…”

Section: " Cmentioning

confidence: 99%

“…Conditions A, D, and E represent absorption conditions in the simulation (see Table 1 and Ref. [17] for graphical visualizations of their DEDs). The lower limit of the vertical axis of the figure is the theoretical minimum of the 2-norm isotropy indicator of 4th degree.…”

Section: Applications Of 2-norm Isotropy Indicator Tomentioning

confidence: 99%

“…Next, the 2-norm isotropy indicator was applied to measured RIRs (see Ref. [17] for details of measurement).…”

Section: Applications Of 2-norm Isotropy Indicator Tomentioning

confidence: 99%

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An isotropic sound field model composed of a finite number of plane waves

Tanaka

Otani

2023

Acoust. Sci. & Tech.

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Isotropy is a fundamental property of a diffuse sound field. Although several studies have proposed an isotropy indicator to quantify the extent of the isotropy of a sound field, what is not yet very clear is how to interpret the quantified isotropy using these indicators. This study aims to contribute to the understanding of the isotropy by (i) modifying an existing isotropy indicator based on the spherical harmonic expansion and (ii) presenting isotropic sound field model composed of a finite number of plane waves. Theoretical and numerical investigations show that a limited-degree isotropy can be established by using the isotropy indicator and the isotropic sound field model.

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“…In Sect. 6.2, the 2-norm isotropy indicator is applied to some RIRs [17] in order to demonstrate the usefulness and limitations of the indicator.…”

Section: " Cmentioning

confidence: 99%

Section: Applications Of 2-norm Isotropy Indicator Tomentioning

confidence: 99%

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An isotropic sound field model composed of a finite number of plane waves

Tanaka

Otani

2023

Acoust. Sci. & Tech.

Self Cite

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“…The late reverberation undergoes multiple boundary reflections, and they are integrated both spatially and temporally before reaching the receiver [45]. Since the late reverberation characteristics are primarily characterized by the surface absorption and room shape [45,46], we can analyze the directional decay rates to study their behavior. We can further visualize the power spectrum of P R (t, k,ŷ|y o ) across time for an extensive analysis of the variations in the anisotropic spatial properties between the early reflections and late reverberations.…”

Section: Directional Decays and Dominant Reflection Directionsmentioning

confidence: 99%

Power Response and Modal Decay Estimation of Room Reflections from Spherical Microphone Array Measurements Using Eigenbeam Spatial Correlation Model

2021

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Modal decays and modal power distribution in acoustic environments are key factors in deciding the perceptual quality and performance accuracy of audio applications. This paper presents the application of the eigenbeam spatial correlation method in estimating the time-frequency-dependent directional reflection powers and modal decay times. The experimental results evaluate the application of the proposed technique for two rooms with distinct environments using their room impulse response (RIR) measurements recorded by a spherical microphone array. The paper discusses the classical concepts behind room mode distribution and the reasons behind their complex behavior in real environments. The time-frequency spectrum of room reflections, the dominant reflection locations, and the directional decay rates emulate a realistic response with respect to the theoretical expectations. The experimental observations prove that our model is a promising tool in characterizing early and late reflections, which will be beneficial in controlling the perceptual factors of room acoustics.

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