Signal processing apparatus, signal processing method, and program

A signal processing device, a technology for separating signals, applied in systems for determining direction or offset, direction finders using ultrasonic/sonic/infrasonic waves, directional multiplex systems, etc. Complete convergence, etc.
CN101604012AInactive Publication Date: 2009-12-16SONY CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SONY CORP
Publication Date
2009-12-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a signal processing device, a signal processing method and program thereof. The signal processing apparatus includes: a learning processing unit that finds a separating matrix for separating mixed signals in which outputs from a plurality of sound sources are mixed, by a learning process that applies ICA (Independent Component Analysis) to observed signals including the mixed signals; a separation processing unit that applies the separating matrix to the observed signals to separate the mixed signals and generate separated signals corresponding to each of the sound sources; and a sound source direction estimating unit that computes a sound source direction of each of the generated separated signals. The sound source direction estimating unit calculates cross-covariance matrices between the observed signals and the separated signals in corresponding time segments in time-frequency domain, computes phase differences between elements of the cross-covariance matrices, and computes a sound source direction corresponding to each of the separated signals by applying the computed phase differences.
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Description

technical field

[0001] The present invention relates to a signal processing device, a signal processing method and a program. More specifically, the present invention relates to a signal processing device, a signal processing method and a program for separating a signal in which a plurality of signals are mixed and further estimating a sound source direction by using Independent Component Analysis (ICA). Background technique

[0002] The present invention relates to a technique for estimating the direction of a sound source (direction of arrival of sound viewed from a microphone; also referred to as Direction of Arrival (DOA)). In particular, the present invention relates to a technique for estimating sound source directions in real time by using Independent Component Analysis (ICA).

[0003] Since the present invention relates to sound source direction estimation and ICA, both will be described in the following order as related techniques. Then, the problems associated wi...

Claims

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