Nearfield binaural synthesis and ambisonics

Menzies, Dylan; Al-Akaidi, Marwan

doi:10.1121/1.2434761

Cited by 45 publications

(32 citation statements)

References 4 publications

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“…1 To account for the distance-dependence of HRTFs in the near-field, approaches have been proposed to estimate near-field HRTFs from measurements taken at a single distance. 2,[6][7][8][9] Recently, HRTF databases have been published containing measurements taken at various distances in the near-field. [10][11][12] However, there is a lack of algorithms and tools to make use of such databases.…”

Section: Introductionmentioning

confidence: 99%

Head-related transfer function interpolation in azimuth, elevation, and distance

Gamper

2013

The Journal of the Acoustical Society of America

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Although distance-dependent head-related transfer function (HRTF) databases provide interesting possibilities, e.g., for rendering virtual sounds in the near-field, there is a lack of algorithms and tools to make use of them. Here, a framework is proposed for interpolating HRTF measurements in 3-D (i.e., azimuth, elevation, and distance) using tetrahedral interpolation with barycentric weights. For interpolation, a tetrahedral mesh is generated via Delaunay triangulation and searched via an adjacency walk, making the framework robust with respect to irregularly positioned HRTF measurements and computationally efficient. An objective evaluation of the proposed framework indicates good accordance between measured and interpolated nearfield HRTFs.

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Section: Introductionmentioning

confidence: 99%

Head-related transfer function interpolation in azimuth, elevation, and distance

Gamper

2013

The Journal of the Acoustical Society of America

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“…When this array is driven with appropriate signals to synthesize a desired virtual source, the HRIRs from the virtual source to the ears is synthesized. In [5,6] two techniques have been introduced which are based on higher-order Ambisonics (HOA) for the computation of the driving signals. The synthesis of virtual sources at closer distances than the loudspeaker array may be subject to instabilities when no countermeasures are taken.…”

Section: Range Extrapolation Of Hrirsmentioning

confidence: 99%

Efficient range extrapolation of head-related impulse responses by wave field synthesis techniques

Spors

Ahrens

2011

2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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Head-related impulse responses (HRIRs), which are measured from an acoustic source to the left and right ear, characterize the acoustic properties of the outer ear. Due to the involved measurement effort, HRIRs are typically available only for source positions on a circle or surface of a sphere. Range extrapolation techniques aim at calculating HRIRs with a different source distance. A number of techniques have been proposed in the past which are based on expansions of HRIRs in terms of surface spherical harmonics. This paper presents an alternative approach which bases on the interpretation of a BRIR dataset as virtual loudspeaker array which is driven by Wave Field Synthesis in order to achieve range extrapolation.

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“…are sometimes used because both the complex-value and real harmonics have the same properties [9], [10]. First-order Ambisonics uses only spherical harmonics with degrees 0 and 1 to encode an audio signal, which results in a set of signals consisting of four channels: W, X, Y, and Z.…”

Section: Ambisonicsmentioning

confidence: 99%

Audio Information Hiding Based on Spatial Masking

Nishimura

2010

2010 Sixth International Conference on Intelligent Information Hiding and Multimedia Signal Processing

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Herein an information hiding technique for audio signals is proposed based on the spatial masking phenomenon observed in the human auditory system. This method employs an audio encoding technique called Ambisonics, which has recently received much attention because unlike conventional audio formats that cannot retain precise spatial information, Ambisonics is capable of reproducing sound space. For secrecy, information is hidden as an additive phantom sound source, which should be located near the real one to exploit spatial masking. Thus, only individuals who know the position of the phantom sound source and the key sequence can extract the hidden information. Additionally, computer simulations of common signal processes confirmed that the proposed method is robust against the all tested attacks except for the pitch scaling attack.

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Nearfield binaural synthesis and ambisonics

Cited by 45 publications

References 4 publications

Head-related transfer function interpolation in azimuth, elevation, and distance

Head-related transfer function interpolation in azimuth, elevation, and distance

Efficient range extrapolation of head-related impulse responses by wave field synthesis techniques

Audio Information Hiding Based on Spatial Masking

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