Related Experiment Video
Updated: Aug 27, 2025
07:14
A Method to Study Adaptation to Left-Right Reversed Audition
Published on: October 29, 2018
6.6K
Spheroidal ambisonics: Spatial audio in spheroidal bases
Shoken Kaneko1, Ramani Duraiswami1
1Perceptual Interfaces and Reality Laboratory, Computer Science and UMIACS, University of Maryland, College Park, Maryland 20742, USA kaneko60@umd.edu, ramanid@umd.edu.
JASA Express Letters
|September 26, 2022
Summary
Spheroidal ambisonics, a new spatial audio method using spheroidal microphone arrays, is introduced. It offers compatibility with existing systems and improves sound field reconstruction accuracy along the array
Area of Science:
- Acoustics
- Signal Processing
- Spatial Audio
Background:
- Ambisonics utilizes spherical harmonics for spatial sound field capture and reproduction.
- Existing ambisonics frameworks are primarily designed for spherical microphone arrays.
Purpose of the Study:
- To propose spheroidal ambisonics, a generalization of ambisonics for spheroidal microphone arrays.
- To ensure compatibility between spheroidal and spherical ambisonics.
- To enhance spatial sound field recording accuracy.
Main Methods:
- Derivation of analytical conversions between spheroidal and spherical ambisonics.
- Implementation of spheroidal ambisonics encoding and transcoding.
- Numerical experiments for verification of the proposed methods.
Main Results:
- Successful analytical conversion from spheroidal to spherical ambisonics.
- Verification of encoding and transcoding processes for spatial sound field recording.
- Demonstration of an extended zone of accurate sound field reconstruction along the prolate spheroidal array's long axis.
Conclusions:
- Spheroidal ambisonics provides a viable framework for spatial audio capture with spheroidal microphone arrays.
- The derived conversions ensure seamless integration with the current ambisonics ecosystem.
- This generalization extends the applicability and accuracy of spatial audio technologies.
More Related Videos
Related Concept Videos
01:23Spherical Coordinates
10.7K
Spherical coordinate systems are preferred over Cartesian, polar, or cylindrical coordinates for systems with spherical symmetry. For example, to describe the surface of a sphere, Cartesian coordinates require all three coordinates. On the other hand, the spherical coordinate system requires only one parameter: the sphere's radius. As a result, the complicated mathematical calculations become simple. Spherical coordinates are used in science and engineering applications like electric and...
10.7K
01:13The Cochlea
45.7K
The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
45.7K
01:21Perceiving Loudness, Pitch, and Location
405
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
405
01:16Anatomy of the Ear
8.7K
Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
8.7K
01:26Gauss's Law: Spherical Symmetry
7.7K
A charge distribution has spherical symmetry if the density of charge depends only on the distance from a point in space and not on the direction. In other words, if the system is rotated, it doesn't look different. For instance, if a sphere of radius R is uniformly charged with charge density ρ0, then the distribution has spherical symmetry. On the other hand, if a sphere of radius R is charged so that the top half of the sphere has a uniform charge density ρ1 and the bottom half...
7.7K
01:15Depth Perception and Spatial Vision
847
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
847