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Scalable coding method for high quality audio

A coding and scaling technology, which is applied in the field of decoding audio data, can solve the problems of not being able to reproduce audio signals, and not supporting the decoding of a single perceptual coded signal.

Inactive Publication Date: 2002-09-11
DOLBY LAB LICENSING CORP
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Another disadvantage of conventional perceptual coding techniques is that they do not support deciphering a single perceptually coded signal and thus cannot reproduce audio signals at more than one subjective quality level

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  • Scalable coding method for high quality audio
  • Scalable coding method for high quality audio
  • Scalable coding method for high quality audio

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Embodiment Construction

[0036] The present invention relates to scalable coding of audio data. Scalable coding uses a data channel with several layers. The layers include a core layer carrying data representing the audio signal at a first resolution and one or more extensions carrying data representing the audio signal at a higher resolution in combination with data carried in the core layer layer. The invention is applicable to audio sub-band signals. Each sub-band signal typically represents a frequency band of the audio spectrum. These frequency bands may overlap each other. Each sub-band signal typically contains one or more sub-band signal units.

[0037] Sub-band signals may be generated using various techniques. One technique is to apply a spectral transform to the audio data, producing sub-band signal units in the spectral domain. One or more adjacent sub-band signal units may be combined into groups to form sub-band signals. The number and identity of the sub-band signal units forming...

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Abstract

Scalable encoding of audio into the core layer based on an ideal noise spectrum determined according to psychoacoustic principles Supports encoding of extension data into the extension layer based on various criteria including offsets from this ideal noise spectrum. Compatible decoding provides multiple decoding resolutions from a single signal. Preferably, sub-band signals resulting from spectral transformation, quadrature mirror filtering, or other conventional processing of the audio input are encoded. A scalable data structure for audio transmission includes a core layer containing the first encoding of the audio signal such that the post-decoding noise is lower than the ideal noise spectrum, and an extension layer containing offset data about the ideal noise spectrum and an extension layer that makes the post-decoding noise lower than the ideal noise spectrum. Decoding data related to encoding of an audio signal with noise below the ideal noise spectrum of the mobile offset data.

Description

technical field [0001] The present invention relates to audio encoding and decoding, and more particularly to scalable coding of audio data into layers of standard data paths and scalable decoding of audio data from standard data paths. Background technique [0002] Due in part to the widespread commercial success of compact disc (CD) technology over the past two decades, 16-bit pulse code modulation (PCM) has become the industry standard for distribution and playback of recorded audio. For most of these two decades, the audio industry touted CD-ROMs as providing superior sound quality to vinyl records and cassette tapes, and many argued for increased audio resolution beyond what could be achieved with 16-bit PCM Audio resolution, with little perceivable benefit to be gained. [0003] In recent years, this belief has been challenged for various reasons. The dynamic range of 16-bit PCM is too limited for noise-free reproduction of all tones. When audio is quantized to 16-b...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02G10L19/035G11B20/10H03M7/30
CPCG10L19/0208G10L19/02
Inventor 路易斯·杜恩·菲尔德史蒂芬·戴克·维诺
Owner DOLBY LAB LICENSING CORP
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