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An audio distribution system, an audio encoder, an audio decoder and methods of operation therefore

An audio encoder and audio decoder technology, applied in the field of multi-channel audio encoding and decoding, can solve problems such as quality degradation and achieve low-complexity effects

Inactive Publication Date: 2007-02-28
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Application Information

AI Technical Summary

Problems solved by technology

Mono reproduction of a stereo signal represents a severe degradation of quality which is usually unacceptable

Method used

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  • An audio distribution system, an audio encoder, an audio decoder and methods of operation therefore
  • An audio distribution system, an audio encoder, an audio decoder and methods of operation therefore
  • An audio distribution system, an audio encoder, an audio decoder and methods of operation therefore

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Embodiment Construction

[0053] The following description focuses on embodiments of the invention that are applicable to stereo encoders and decoders, and in particular to the encoding and decoding of digital audio data containing audio data associated with MPEG Audio Layer II ( mp2) encodes standard-compliant audio data and also contains parametric stereo (PS) parametric extension data. However, it should be understood that the invention is not limited to this application, but may be applied to many other forms of multi-channel systems.

[0054] According to the described embodiments, intensity stereo coding is used in an encoder to generate information for a quality-limited stereo signal. This intensity stereo encoding is performed according to the encoding protocol used for the underlying signal. In particular, mp2 stereo intensity encoding is used. In parallel, the encoder generates parametrically encoded PS extension data, which is included in the ancillary data part of the mp2 data.

[0055] ...

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Abstract

A stereo audio encoder ( 100 ) comprises a parametric stereo encoder ( 115 ) which generates a mono signal and parametric stereo parameters for at least a high frequency part of an input stereo signal. A stereo intensity encoder ( 117 ) generates stereo intensity data for the mono signal. The mono signal and intensity data are encoded in accordance with an encoding standard such as MPEG Layer II and the parametric stereo parameters are included in the ancillary data sections by an output processor ( 113 ). Thus, a legacy decoder (such as an MPEG Layer II decoder) may generate a stereo signal using the stereo intensity data whereas a higher complexity decoder may generate a high quality audio signal using the parametric stereo parameters. A stereo decoder ( 200 ) receives the encoded data from the encoder ( 100 ). An intensity decoder ( 203 ) generates a stereo signal using intensity data. This is fed to a parametric stereo decoder ( 207 ) which processes the stereo signal in accordance with extracted parametric stereo data.

Description

technical field [0001] The present invention relates to audio distribution systems, audio encoders, audio decoders and methods of operation thereof, and in particular to multi-channel audio encoding and decoding. Background of the invention [0002] The distribution and storage of content signals in digital form has increased significantly in recent years. Accordingly, a large number of coding standards and protocols have been developed. [0003] One of the most common coding standards for digital audio coding of audio signals is the Moving Picture Experts Group Layer 3 standard commonly known as MP3. For example, MP3 allows a 30 or 40 megabyte digital PCM (Pulse Code Modulation) audio recording of a song to be compressed into eg a 3 or 4 megabyte MP3 file. The exact compression ratio depends on the desired quality of the MP3-encoded audio. Other examples of audio coding standards and technologies include: MPEG AAC (Advanced Audio Coding), ATRAC3 (Adaptive Transform Acous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/008
CPCG10L19/008H03M7/30
Inventor L·M·范德柯克霍夫
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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