Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Reexamination Certificate
2006-07-18
2006-07-18
Knepper, David D. (Department: 2654)
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
C704S215000, C704S226000
Reexamination Certificate
active
07080007
ABSTRACT:
An apparatus and a method for computing a Speech Absence Probability (SAP), and an apparatus and a method for removing noise by using the SAP computing device and method are provided. The provided SAP computing device for computing the SAP indicating probability that speech is absent in a mthframe, from a first through Ncthposteriori (Nc means the total number of channels) Signal to Noise Ratios (SNR) calculated with regard to the mthframe of a speech signal and a first through Ncthpredicted SNRs predicted with regard to the mthframe, includes: a first through Ncthlikelihood ratio generators for generating a first through Ncthlikelihood ratios from the first through Ncthposterior SNRs and the first through Ncthpredicted SNRs, and outputting them; a first multiplying unit for multiplying the first through Ncthlikelihood ratios by a predetermined a priori probability, and outputting the multiplication results; an adding unit for adding each of the multiplication results received from the first multiplying unit to a predetermined value, and outputting the added results; a second multiplying unit for multiplying the added results received from the adding unit and outputting the multiplication result; and a inverse number calculator for calculating inverse number of the multiplication result received from the second multiplying unit and outputting the calculated inverse number as the SAP. Therefore, since the accuracy of the calculated SAP is high, noise can be efficiently removed from the speech signal that may have noise and an enhanced speech signal with an enhanced quality can be provided.
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Kim Sang-ryong
Shin Vladimir
Son Chang-yong
Buchanan & Ingersoll PC
Knepper David D.
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