Data processing: speech signal processing – linguistics – language – Speech signal processing – Psychoacoustic
Reexamination Certificate
2006-06-13
2006-06-13
Chawan, Vijay B. (Department: 2654)
Data processing: speech signal processing, linguistics, language
Speech signal processing
Psychoacoustic
C704S219000, C704S220000, C704S224000, C704S500000, C704S229000, C375S240120, C375S240080
Reexamination Certificate
active
07062429
ABSTRACT:
A method and apparatus are disclosed for controlling a buffer in a communication system, such as a digital audio broadcasting (DAB) communication system. A more consistent perceptual quality over time provides for a more pleasing auditory experience to a listener. Thus, the disclosed bit allocation process determines, for each frame, a distortion d[k] at which the frame is to be encoded. Generally, the distortion d[k] is determined to minimize (i) the probability for a buffer overflow, and (ii) the variation of perceived distortion over time. A buffer level is controlled by partitioning a signal into a sequence of successive frames; estimating a distortion rate for a number of frames; and selecting a distortion such that the variance of the buffer level is bounded by a specified value. In one implementation, a signal is coded by partitioning the signal into a sequence of successive frames; encoding each frame k for each of a plurality of distortions Dito compute a frame bitrate; estimating an average bitrate Ri[k] for each of said plurality of distortions Digiven current and past frame bitrates; interpolating between each of said pair of values for said average bitrate Ri[k] and said plurality of distortions Dito obtain an approximation of a function that maps a distortion to an estimated average bitrate; and encoding each frame with a distortion level determined from said function.
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U.S. Appl. No. 09/477,314, filed Jan. 4, 2000, entitled “Perceptual Audio Coder Bit Allocation Scheme Providing Improved Perceptual Quality Consistency”.
Agere Systems Inc.
Chawan Vijay B.
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