Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Reexamination Certificate
2007-07-05
2011-10-18
Armstrong, Angela A (Department: 2626)
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
C704S210000
Reexamination Certificate
active
08041563
ABSTRACT:
Activity is determined for each frequency band in a frame, and when it is determined that an activity-OFF state has not continued for a predetermined number of times for preceding frames, normal coding processing is performed for the frequency band. When it is determined that the activity-OFF state has continued for the predetermined number of times or more, DTX coding is performed for the frequency band. After this processing has been performed for all of the bands of one frame, a total power of the one entire frame and the power of the band or bands to which the DTX coding is applied are calculated. Subsequently, a new target bit value is calculated based on a ratio of the total power of the one entire frame and the power of the band or bands to which the DTX coding is applied.
REFERENCES:
patent: 5150387 (1992-09-01), Yoshikawa et al.
patent: 2004/0024596 (2004-02-01), Carney et al.
patent: 2005/0177364 (2005-08-01), Jelinek
patent: 03-191618 (1991-08-01), None
Miseki Kimio
Osada Masataka
Takeuchi Hirokazu
Armstrong Angela A
Holtz, Holtz, Goodman & Chick, P.C.
Kabushiki Kaisha Toshiba
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