Title:
音信号加工装置
Document Type and Number:
Japanese Patent JP4684359
Kind Code:
B2
Abstract:
A method and an apparatus for processing a sound signal are provided, which process an input sound signal including degraded sound such as quantization noise so as to make the degraded sound subjectively unperceptible. A transformation strength controller calculates a spectrum of a decoded speech after perceptually weighting the decoded speech as the input sound signal, and calculates transformation strength based on the extent of the amplitude and the continuity of the spectrum. A signal transformer obtains a spectrum of the decoded speech, smoothes the amplitude and disturbs the phase based on the transformation strength, and the obtained signal is returned back to a signal region as a transformed decoded speech. A signal evaluator obtains background noise likeness by analyzing the decoded speech and the obtained value is made to be an addition control value. In the weighted value adder, when the addition control value appears to be the background noise likeness, the weight for adding to the decoded speech is reduced, the weight for adding to the transformed decoded speech is increased, and an output speech is obtained.
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Inventors:
Hirohisa Tazaki
Application Number:
JP2010131107A
Publication Date:
May 18, 2011
Filing Date:
June 08, 2010
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
G10L21/0364; G10L19/00; G10L19/26; G10L21/02; G10L21/0208; G10L21/034
Domestic Patent References:
| JP5224698A | ||||
| JP8063194A | ||||
| JP9311698A | ||||
| JP59057539A |
Attorney, Agent or Firm:
Shoji Mizoi