Method and apparatus to encode and decode audio signal by using bandwidth extension technique

A technology of audio signal encoding and bandwidth expansion, which is applied in speech analysis, code conversion, electrical components, etc., and can solve problems such as audio signal quality degradation

Inactive Publication Date: 2008-04-16
SAMSUNG ELECTRONICS CO LTD
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  • Method and apparatus to encode and decode audio signal by using bandwidth extension technique
  • Method and apparatus to encode and decode audio signal by using bandwidth extension technique
  • Method and apparatus to encode and decode audio signal by using bandwidth extension technique

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[0043] Since structural or functional descriptions are provided to describe example embodiments of the invention, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

[0044] The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The exemplary embodiments should be considered in descriptive purpose only and not in restrictive purpose, and all differences within the scope will be construed as being included in the present invention. The same reference numerals refer to the same parts in the drawings.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used in the description have the meaning commonly understood by one of ordinary skill in the art. Terms defined in commonly used dictionaries should be interpreted as having the same meaning as terms in the related ...

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Abstract

A method and an apparatus for encoding/decoding an audio signal by using bandwidth expansion technique are provided to output an encoded bitplane and encoded bandwidth expansion information as an encoded result of an input signal, thereby efficiently encoding high frequency components at a limited bit rate and accordingly improving sound quality. An audio signal encoding method comprises the following steps of: splitting an input signal into a high band signal and a low band signal(1300); converting each of the high and low band signals from a time domain to a frequency domain(1310); performing quantization and context-dependent bitplane encoding of the converted low band signal(1320); generating and encoding bandwidth expansion information showing a characteristic of the converted high band signal by using the converted low band signal(1330); and outputting the encoded bitplane and the encoded bandwidth expansion information as an encoded result of the input signal(1340).

Description

technical field [0001] The present invention relates to a method and device for encoding and decoding audio signals, and more particularly, to a method and device for encoding and decoding audio signals using bandwidth extension technology. Background technique [0002] When encoding or decoding an audio signal, it is necessary to optimize the quality of the audio signal by using a limited bit rate. At low bit rates the amount of bits available is smaller, so the audio signal must be encoded or decoded by reducing the frequency bandwidth of the audio signal. Therefore, the quality of audio signals may be degraded. [0003] Generally, low-frequency components are more important than high-frequency components for people to recognize audio signals. Therefore, there is a need for a method of improving the quality of an audio signal by increasing the amount of bits allocated for encoding low frequency components and reducing the amount of bits allocated for encoding high freque...

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Application Information

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IPC IPC(8): G10L19/00G10L19/02H03M7/30
CPCG10L19/0204G10L19/035G10L19/24
Inventor 吴殷美朱基岘苗磊
Owner SAMSUNG ELECTRONICS CO LTD
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