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Method and apparatus to recover a high frequency component of audio data

A technology of high frequency component and low frequency component, applied in the field of audio coding/decoding system, can solve the problem that MP3pro decoder cannot recover high frequency component

Inactive Publication Date: 2006-02-15
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology

Therefore, the conventional MP3 decoding method using the SBR method requires a large amount of computation in the time-domain / frequency-domain conversion process
[0009] Secondly, since the MP3pro decoder using the SBR method processes the spectral envelope information obtained from the encoder to recover the high-frequency components in the frequency domain, MP3 encoders using other traditional encoding methods cannot be used together with the MP3pro decoder, must be refactored
That is, an MP3pro decoder using the SBR method cannot recover high frequency components from conventional MP3 files that do not include spectral envelope information

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  • Method and apparatus to recover a high frequency component of audio data
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  • Method and apparatus to recover a high frequency component of audio data

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[0020] Reference will now be made in detail to embodiments of the present general inventive concept, examples of which are illustrated in the accompanying drawings, wherein like reference numerals describe like parts throughout. The embodiments are described below in order to explain the present general concept by referring to the figures.

[0021] An MP3 bitstream input to an MP3 decoder according to the general concept of the present invention is formed by the following process. In the first step, Pulse Code Modulation (PCM) audio data is input. In the second step, PCM audio data input for each grain (minimum unit (576 samples) for performing encoding) is divided into 576 samples. In the third step, the perceived energy is obtained by applying the psychoacoustic model of MPEG-1 Layer 3 (MP3) to the samples. In the fourth step, the perceived energy obtained from the psychoacoustic model is compared with a threshold to determine the Modified Discrete Cosine Transform (MDCT) ...

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Abstract

A method and an apparatus to recover a high frequency component of an MP3 encoded audio signal in an audio decoder. The method includes: generating a filter bank value of a low frequency band from a modified discrete cosine transform (MDCT) coefficient, which is extracted from an input bitstream according to a window type, extracting transient information of a frame according to the window type and selecting a weight coefficient according to the extracted transient information, recovering a filter bank value of a lost high frequency band from the generated filter bank value of the low frequency band, and adjusting the recovered filter bank value of recovered high frequency components according to the weight coefficient.

Description

[0001] This application claims priority to Korean Patent Application No. 10-2004-0061423 filed with the Korean Intellectual Property Office on Aug. 4, 2004, which is hereby incorporated by reference. technical field [0002] The general concept of the present invention relates to an audio encoding / decoding system, and more particularly to a method and apparatus for recovering high frequency components of an MPEG layer 3 (commonly known as MP3) encoded audio signal in an audio decoder . Background technique [0003] Audio Motion Picture Experts Group (MPEG) is an ISO / IEC standard for encoding stereo audio with high quality and performance, where ISO stands for International Organization for Standardization and IEC stands for International Electrotechnical Commission. High performance multimedia data compression can be achieved by combining MPEG standard audio and MPEG standard video in various application products such as digi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/14H04N7/52G10L19/02G10L21/0388H03M7/30
CPCG10L19/04G10L21/038G11B20/10
Inventor 吴润学李爀在
Owner SAMSUNG ELECTRONICS CO LTD
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