System and method for stereo perceptual audio coding using adaptive masking threshold

A technology of masking threshold and perceptual coding, which is applied in the field of audio compression and can solve problems such as the complexity of the encoder

Active Publication Date: 2007-09-05
STMICROELECTRONICS ASIA PACIFIC PTE
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  • Abstract
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Problems solved by technology

[0010] Encoder is much more complex than decoder due to psychoacoustic modules and bit allocation - quantization

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  • System and method for stereo perceptual audio coding using adaptive masking threshold
  • System and method for stereo perceptual audio coding using adaptive masking threshold
  • System and method for stereo perceptual audio coding using adaptive masking threshold

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Embodiment Construction

[0023] 1-8 and the various embodiments described in this disclosure are for illustration purposes only, and they should not be considered as limitations on the scope of the invention. Those skilled in the art will recognize that the various embodiments described herein may be modified, but such modifications fall within the scope of the invention.

[0024] As used herein, the phrase "perceptual audio coder" refers to an audio compression scheme that exploits the perceptual properties of human hearing. Various embodiments include techniques for configuring quantization noise below a masking threshold to render such noise imperceptible to the human ear. Such processing can be quite computationally intensive, in particular due to the psychoacoustic analysis and the bit allocation-quantization process. Techniques disclosed herein include methods to simplify the psychoacoustic modeling process by adaptively reusing computed masking thresholds based on signal characteristics. Also...

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Abstract

A method for stereo audio perceptual encoding of an input signal includes masking threshold estimation and bit allocation. The masking threshold estimation and bit allocation are performed once every two encoding processes. Another method for stereo audio perceptual encoding of an input signal includes performing a time-to-frequency transformation, performing a quantization, performing a bitstream formatting to produce an output stream, and performing a psychoacoustics analysis. The psychoacoustics analysis includes masking threshold estimation on a first of every two successive frames of the input signal.

Description

[0001] Cross References to Related Applications [0002] Pursuant to 35 U.S.C. §119(e), this application claims priority to U.S. Provisional Patent Application 60 / 758,369, filed January 12, 2006, which is hereby incorporated by reference. technical field [0003] The present disclosure relates generally to audio compression, and more particularly to systems and methods for low-power stereo-aware audio coding using adaptive masking thresholds. Background technique [0004] Digital audio transmission typically requires considerable storage space and bandwidth. For efficient transmission, signal compression is often employed. Efficient coding systems eliminate irrelevant and redundant parts of an audio stream in an optimized manner. The first goal above can be achieved by reducing psychoacoustic irrelevance through psychoacoustic analysis. "Perceptual audio coders" refer to those compression schemes that exploit the perceptual properties of human hearing. [0005] FIG. 1 sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00H03M7/30G10L19/02
CPCG10L19/02
Inventor E·库尔尼亚瓦蒂S·乔治
Owner STMICROELECTRONICS ASIA PACIFIC PTE
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