Speech signal separation apparatus and method
AssigneeSony Corporation
InventorAtsuo Hiroe
Life of this patent
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Abstract
A speech signal separation apparatus for separating an observation signal in a time domain of a plurality of channels wherein a plurality of signals having a speech signal are mixed using independent component analysis to produce a plurality of separation signals of the different channels, including: a first conversion section, a non-correlating section, a separation section, and a second conversion section.
Claims4
A speech signal separation apparatus for separating an observation signal in a time domain of a plurality of channels wherein a plurality of signals including a speech signal are mixed using independent component analysis to produce a plurality of separation signals of the different channels, comprising:
- a first conversion section configured to convert the observation signal in the time domain into an observation signal in a time-frequency domain;
- a non-correlating section configured to non-correlate the observation signal in the time-frequency domain between the channels;
- a separation section configured to produce separation signals in the time-frequency domain from the observation signal in the time-frequency domain;
- and
- a second conversion section configured to convert the separation signals in the time-frequency domain into separation signals in the time domain;
- said separation section being operable to produce the separation signals in the time-frequency domain from the observation signal in the time-frequency domain and a separation matrix in which initial values are substituted, calculate modification values for the separation matrix using the separation signals in the time-frequency domain, a score function which uses a multi-dimensional probability density function, and the separation matrix, modify the separation matrix until the separation matrix substantially converges using the modification values and produce separation signals in the time-frequency domain using the substantially converged separation matrix;
- each of the separation matrix which includes the initial values and the separation matrix after the modification which includes the modification values being a normal orthogonal matrix.
A speech signal separation method for separating an observation signal in a time domain of a plurality of channels wherein a plurality of signals including a speech signal are mixed using independent component analysis to produce a plurality of separation signals of the different channels, comprising the steps of:
- converting the observation signal in the time domain into an observation signal in a time-frequency domain;
- non-correlating the observation signal in the time-frequency domain between the channels;
- producing separation signals in the time-frequency domain from the observation signal in the time-frequency domain and a separation matrix in which initial values are substituted;
- calculating modification values for the separation matrix using the separation signals in the time-frequency domain, a score function which uses a multi-dimensional probability density function, and the separation matrix;
- modifying the separation matrix using the modification values until the separation matrix substantially converges;
- and
- converting the separation signals in the time-frequency domain produced using the substantially converged separation matrix into separation signals in the time domain;
- each of the separation matrix which includes the initial values and the separation matrix after the modification which includes the modification values being a normal orthogonal matrix.
Dependencies are inferred from the claim text.