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Method for high frequency reconstruction and apparatus thereof

A high-frequency component and equipment technology, applied in the field of audio coding, can solve problems such as difficult construction, inconsistent spectral envelope shape or rate of change, and not separately detecting input signal bandwidth.

Inactive Publication Date: 2007-06-06
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology

[0007] However, conventional high-frequency component restoration equipment should use an adaptive filter with a complicated structure because it does not detect the bandwidth of the input signal individually
Therefore, it is difficult to construct conventional high-frequency component restoration equipment
Also, the gain used when controlling the gain of the restored audio signal has a fixed value, and thus the restored audio signal has a lower-than-average quality, and the shape or rate of change of the spectral envelope cannot be consistent with the original audio signal

Method used

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  • Method for high frequency reconstruction and apparatus thereof
  • Method for high frequency reconstruction and apparatus thereof
  • Method for high frequency reconstruction and apparatus thereof

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[0033] 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 refer to like parts throughout. The embodiments are described below in order to explain the present general inventive concept by referring to the figures.

[0034] FIG. 4A is a block diagram illustrating an apparatus for restoring high frequency components of an audio signal according to an embodiment of the present general inventive concept. Referring to FIG. 4A, the signal bandwidth detector 400 obtains a correlation between an input signal and previously stored noise samples, and detects the bandwidth of the input signal based on the correlation. Noise samples are obtained by dividing general white noise into signals each having a predetermined bandwidth. That is, the noise samples are not correlated with the input signal.

[0035] The signal bandwidth detector 400 may include a...

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Abstract

A method and apparatus to restore a high frequency component. A correlation between an input signal and previously stored noise samples is obtained and a bandwidth of the input signal is detected according to the correlation. The detected input signal bandwidth is split into a predetermined number of sub-bands. A level of high frequency sub-band signals generated by performing a predetermined nonlinear operation on the split sub-bands is controlled in response to energy levels of the high frequency sub-bands to obtain restored signals. The restored signals and the input signal are combined to generate a target audio signal.

Description

[0001] This application claims the benefit of Korean Patent Application No. 10-2005-0114047 filed with the Korean Intellectual Property Office on Nov. 28, 2005, which is hereby incorporated by reference in its entirety. technical field [0002] The present general inventive concept relates to an audio encoding technology, and more particularly, to a method and apparatus for reconstructing high frequency components of an encoded audio signal. Background technique [0003] An audio CODEC (Coder Decoder) such as MP3 (MPEG1 Audio Layer 3) uses a technique of removing components (ie, high-frequency components) that are not important to human hearing from audio signals. However, high frequency components contribute to the quality of the audio signal and complement the liveliness of the sound. Therefore, high-frequency components should be maintained, or restored appropriately, to obtain high-quality audio sound. Therefore, an MP3 PR...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00H03M7/30G11C7/16
CPCG10L21/038
Inventor 曼尼斯·阿洛拉
Owner SAMSUNG ELECTRONICS CO LTD