Audio processing device, method and program
AssigneesSony Corporation, Institut de Recherche et Coordination Acoustique/Musique
InventorsYuhki Mitsufuji, Axel Roebel
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Abstract
An audio processing device including a factorization unit which factorizes frequency information obtained by performing time-frequency transformation on an audio signal of a plurality of channels into a channel matrix representing characteristics of a channel direction, a frequency matrix representing characteristics of a frequency direction, and a time matrix representing characteristics of a time direction; and an extraction unit which extracts the frequency information of audio from an arbitrary designated direction based on the channel matrix, the frequency matrix, and the time matrix.
Claims8
An audio processing device comprising:
- circuitry configured to:
- factorize frequency information obtained by performing time-frequency transformation on an audio signal from a plurality of channels into a channel matrix representing characteristics of a channel direction, a frequency matrix representing characteristics of a frequency direction, and a time matrix representing characteristics of a time direction;
- obtain direction specification information specifying a matrix component relating to audio from a designated direction based on direction information of the designated direction and the channel matrix representing the designated direction;
- determine a direction specific amplification factor using the direction specification information;
- and
- extract the frequency information of audio from the designated direction based on the channel matrix, the frequency matrix, the time matrix, and the direction specification information by amplifying the frequency information by the direction specific amplification factor.
An audio processing method comprising:
- factorizing frequency information obtained by performing time-frequency transformation on an audio signal from a plurality of channels into a channel matrix representing characteristics of a channel direction, a frequency matrix representing characteristics of a frequency direction, and a time matrix representing characteristics of a time direction;
- obtaining direction specification information specifying a matrix component relating to audio from a designated direction based on direction information of the designated direction and the channel matrix representing the designated direction;
- determining a direction specific amplification factor using the direction specification information;
- and
- extracting, using circuitry, the frequency information of audio from the designated direction based on the channel matrix, the frequency matrix, the time matrix, and the direction specification information by amplifying the frequency information by the direction specific amplification factor.
A non-transitory computer readable medium including executable instructions, which when executed by a computer cause the computer to execute an audio processing method comprising:
- factorizing frequency information obtained by performing time-frequency transformation on an audio signal from a plurality of channels into a channel matrix representing characteristics of a channel direction, a frequency matrix representing characteristics of a frequency direction, and a time matrix representing characteristics of a time direction;
- obtaining direction specification information specifying a matrix component relating to audio from a designated direction based on direction information of the designated direction and the channel matrix representing the designated direction;
- determining a direction specific amplification factor using the direction specification information;
- and
- extracting the frequency information of audio from the designated direction based on the channel matrix, the frequency matrix, the time matrix, and the direction specification information by amplifying the frequency information by the direction specific amplification factor.
Dependencies are inferred from the claim text.