Hemispheric difference in evoked potentials to spatial sound field stimuli

1983 ◽  
Vol 74 (S1) ◽  
pp. S64-S65 ◽  
Author(s):  
Y. Ando ◽  
I. Hosaka
Keyword(s):  
Evoked Potentials ◽  
Sound Field ◽  
Hemispheric Difference ◽  
Spatial Sound

scholarly journals Efficient binaural rendering of spherical microphone array data by linear filtering

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Johannes M. Arend ◽  
Tim Lübeck ◽  
Christoph Pörschmann
Keyword(s):  
Real Time ◽  
Transfer Functions ◽  
Finite Impulse Response ◽  
Microphone Array ◽  
Sound Field ◽  
Limited Range ◽  
Time Signal ◽  
Head Orientation ◽  
Linear Filtering ◽  
Spatial Sound

AbstractHigh-quality rendering of spatial sound fields in real-time is becoming increasingly important with the steadily growing interest in virtual and augmented reality technologies. Typically, a spherical microphone array (SMA) is used to capture a spatial sound field. The captured sound field can be reproduced over headphones in real-time using binaural rendering, virtually placing a single listener in the sound field. Common methods for binaural rendering first spatially encode the sound field by transforming it to the spherical harmonics domain and then decode the sound field binaurally by combining it with head-related transfer functions (HRTFs). However, these rendering methods are computationally demanding, especially for high-order SMAs, and require implementing quite sophisticated real-time signal processing. This paper presents a computationally more efficient method for real-time binaural rendering of SMA signals by linear filtering. The proposed method allows representing any common rendering chain as a set of precomputed finite impulse response filters, which are then applied to the SMA signals in real-time using fast convolution to produce the binaural signals. Results of the technical evaluation show that the presented approach is equivalent to conventional rendering methods while being computationally less demanding and easier to implement using any real-time convolution system. However, the lower computational complexity goes along with lower flexibility. On the one hand, encoding and decoding are no longer decoupled, and on the other hand, sound field transformations in the SH domain can no longer be performed. Consequently, in the proposed method, a filter set must be precomputed and stored for each possible head orientation of the listener, leading to higher memory requirements than the conventional methods. As such, the approach is particularly well suited for efficient real-time binaural rendering of SMA signals in a fixed setup where usually a limited range of head orientations is sufficient, such as live concert streaming or VR teleconferencing.

scholarly journals Binaural Reproduction Based on Bilateral Ambisonics

2021 ◽  
Author(s):  
Zamir Ben-Hur ◽  
David Alon ◽  
Or Berebi ◽  
Ravish Mehra ◽  
Boaz Rafaely
Keyword(s):  
Detrimental Effect ◽  
Sound Field ◽  
Substantial Improvement ◽  
Binaural Processing ◽  
Truncation Errors ◽  
Spatial Sound ◽  
Reproduction Process ◽  
Virtual And Augmented Reality ◽  
Head Related Transfer Function ◽  
Head Rotations

Binaural reproduction of high-quality spatial sound has gained considerable interest with the recent technology developments in virtual and augmented reality. The reproduction of binaural signals in the Spherical-Harmonics (SH) domain using Ambisonics is now a well-established methodology, with flexible binaural processing realized using SH representations of the sound-field and the Head-Related Transfer Function (HRTF). However, in most practical cases, the binaural reproduction is order-limited, which introduces truncation errors that have a detrimental effect on the perception of the reproduced signals, mainly due to the truncation of the HRTF. Recently, it has been shown that manipulating the HRTF phase component, by ear-alignment, significantly reduces its effective SH order while preserving its phase information, which may be beneficial for alleviating the above detrimental effect. Incorporating the ear-aligned HRTF into the binaural reproduction process has been suggested by using Bilateral Ambisonics, which is an Ambisonics representation of the sound-field formulated at the two ears. While this method imposes challenges on acquiring the sound-field, and specifically, on applying head-rotations, it leads to a significant reduction in errors caused by the limited-order reproduction, which yields a substantial improvement in the perceived binaural reproduction quality even with first order SH.

Effects of variable acoustic elements on the spatial sound field in multipurpose venues

2017 ◽  
Vol 142 (4) ◽  
pp. 2688-2688
Author(s):  
Michelle C. Vigeant ◽  
Matthew T. Neal ◽  
David A. Dick
Keyword(s):  
Sound Field ◽  
Spatial Sound

scholarly journals Analysis of effects of spherical microphone array physical parameters using simulations

2013 ◽  
Vol 26 (2) ◽  
pp. 107-119
Author(s):  
Dejan Ciric ◽  
Ana Djordjevic ◽  
Marko Licanin
Keyword(s):  
Sound Source ◽  
Microphone Array ◽  
Sound Field ◽  
Embedded Software ◽  
Microphone Arrays ◽  
Field Analysis ◽  
Physical Parameters ◽  
Spatial Sound ◽  
Spherical Microphone Arrays

Spherical microphone arrays are used for spatial sound field analysis. Although there are commercially available products, they are not the most suitable for research due to their price and working limits of the embedded software. In those cases it is more convenient to build an own prototype in a lab. In this paper, the analysis of the effects of the physical parameters of a spherical microphone array is presented. The observed parameters are radius of the sphere, distance from the sound source and distribution of the microphone elements points over the sphere. The obtained results provide useful inputs for building a spherical microphone array for the desired applications.

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