System and method for realistic rotation of stereo or binaural audio
OwnerPhilip Raymond Schaeferinventor
Life of this patent
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Abstract
A system for rotating sound provides for the ability of the apparent direction of sound sources in a listening environment to remain in consistent orientations in space despite rotations of the microphones used to capture the sound and despite rotations of the head of the listener, even when wearing headphones. Modules are provided in the system to distinguish the sound sources and their apparent directions, as well as to rotate the sound sources in response to detected rotations of the listener's head and/or detected rotations of the microphones.
Claims20
A system for extracting sound signals from multiple directions comprising:
- a plurality of Sound Source Extractors, wherein a first Sound Source Extractor of the plurality of Sound Source Extractors comprises a Source Filter and an Angle Calculator, and wherein a second Sound Source Extractor of the plurality of Sound Source Extractors comprises a second Source Filter and a second Angle Calculator;
- wherein the first Sound Source Extractor is configured to receive a multiple-channel input sound signal;
- and wherein the second Sound Source Extractor is configured to receive the multiple-channel input sound signal;
- and wherein the Source Filter is configured to receive the multiple-channel input sound signal and to output a sound source signal;
- and wherein the second Source Filter is configured to receive the multiple-channel input sound signal and to output a second sound source signal;
- and wherein the Angle Calculator is configured to produce an apparent direction based on the sound source signal;
- and wherein the second Angle Calculator is configured to produce a second apparent direction based on the second sound source signal;
- and wherein the Source Filter comprises a filter configured to have a frequency response comprising a plurality of local maxima occurring substantially periodically as a function of frequency, and wherein the Source Filter is associated with a fundamental frequency.
A method for extracting sound signals from multiple directions comprising:
- providing a first filter having a first fundamental frequency and a first frequency response, the first frequency response comprising a first plurality of local amplitude maxima occurring substantially periodically with frequency;
- providing a second filter having a second fundamental frequency and a second frequency response, the second frequency response comprising a second plurality of local amplitude maxima occurring substantially periodically with frequency;
- receiving a multiple-channel input sound signal;
- filtering the multiple-channel input sound signal with the first filter and outputting a first multiple-channel sound source signal;
- filtering the multiple-channel input sound signal with the second filter and outputting a second multiple-channel sound source signal;
- producing a first apparent direction based on the first multiple-channel sound source signal;
- and producing a second apparent direction based on the second multiple-channel sound source signal.
Dependencies are inferred from the claim text.