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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.

Inactive Publication Date: 2009-12-16
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0162] (2) The separation matrix has not fully converged
However, since a model without reverberation is assumed and values ​​such as sound velocity and microphone position are used in the estimation of the transfer function, the accuracy of separation decreases if such assumptions or values ​​are different from those in the actual environment

Method used

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  • Signal processing apparatus, signal processing method, and program
  • Signal processing apparatus, signal processing method, and program
  • Signal processing apparatus, signal processing method, and program

Examples

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Embodiment

[0349] Next, a description will be given of a specific configuration and processing example of a signal processing apparatus according to an embodiment of the present invention, which performs sound source direction estimation processing using the above-described 1. cross-covariance matrix and 2. straight line fitting.

[0350] (device configuration)

[0351] Figure 12 The configuration of a signal processing device according to an embodiment of the present invention is shown. Figure 12 The device configuration shown is based on Japanese Patent Application No. 2006-331823 "REAL-TIME SOUND SOURCE SEPARATION APPARATUS AND METHOD" previously filed by the present applicant. The sound source direction estimation unit 125 is added to the configuration disclosed in Japanese Patent Application No. 2006-331823. Figure 12 The signal processing means shown can be embodied by, for example, a PC. That is, respective processes in the separation processing unit 123 , the learning proce...

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PUM

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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.

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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Application Information

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IPC IPC(8): G01S3/808G10L21/028G10L21/0308
CPCG01S3/801G01S3/8006
Inventor 广江厚夫
Owner SONY CORP
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