Method and apparatus for stereo to five channel upmix
AssigneeNokia Technologies Oy
InventorMithil Ramteke
Life of this patent
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Abstract
An apparatus comprising at least one processor and at least one memory including computer program code The at least one memory and the computer program code is configured to, with the at least one processor, cause the apparatus at least to perform determining a covariance matrix for at least one frequency band of a first and a second audio signal, non-negative factorizing the covariance matrix to determine at least one first weighting value and at least one second weighting value associated with the at least one frequency band; and determining a third audio signal associated with the at least one frequency band by combining the first weighting value and the first audio signal to the second weighting value and the second audio signal.
Claims20
A method comprising:
- determining a covariance matrix for at least one frequency band of a first and a second audio signal, wherein the covariance matrix comprises a cross correlation coefficient between the first and the second audio signal;
- non-negative factorizing the covariance matrix, based on the cross correlation coefficient, to determine at least one first weighting value and at least one second weighting value associated with the at least one frequency band based on the cross correlation coefficient;
- determining a third audio signal associated with the at least one frequency band by combining the first weighting value and the first audio signal to the second weighting value and the second audio signal, and
- generating a plurality of channels from the first weighting value and the second weighting value corresponding to the non-negative factorized covariance matrix.
An apparatus comprising at least one processor and at least one memory including computer program code the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform:
- determine a covariance matrix for at least one frequency band of a first and a second audio signal, wherein the covariance matrix comprises a cross correlation coefficient between the first and the second audio signal;
- non-negative factorize the covariance matrix, based on the cross correlation coefficient, to determine at least one first weighting value and at least one second weighting value associated with the at least one frequency band;
- determine a third audio signal associated with the at least one frequency band by combining the first weighting value and the first audio signal to the second weighting value and the second audio signal, and
- generate a plurality of channels from the first weighting value and the second weighting value corresponding to the non-negative factorized covariance matrix.
Dependencies are inferred from the claim text.