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Method for implementing equalizer in audio signal decoder and apparatus thereof

A technology of audio signal and frequency band, applied in the field of realizing equalizer, which can solve the problems of delay, increasing the complexity of audio reproduction device, etc.

Inactive Publication Date: 2009-01-28
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During this process, the equalizer should handle a large number of signals, which increases the complexity of realizing a complete audio reproduction device with an equalizer
Also, after the user adjusts the amplitude of the frequency component through the input device, in order to output real sound through the speaker, information about the adjusted amplitude should be transformed by IMDCT or IFFT, which brings delay

Method used

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  • Method for implementing equalizer in audio signal decoder and apparatus thereof
  • Method for implementing equalizer in audio signal decoder and apparatus thereof
  • Method for implementing equalizer in audio signal decoder and apparatus thereof

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Embodiment Construction

[0022] The present invention will be described in further detail with reference to the associated drawings showing preferred embodiments of the invention.

[0023] FIG. 2 is a block diagram showing the structure of an audio signal decoder according to a preferred embodiment of the present invention.

[0024] As shown in FIG. 2 , the audio signal decoder according to the present preferred embodiment includes a stream decoder 210 , an inverse quantization unit 220 , a multi-channel decoder 230 , an equalizer 240 and a transformation unit 260 . The user interface 250 is a module that exists independently from the audio signal decoder.

[0025] The stream decoder 210 analyzes and parses a bit stream obtained by encoding an audio signal, and the inverse quantization unit 220 inverse quantizes a value output from the stream decoder 210 .

[0026] The multi-channel decoder 230 decodes the value output from the inverse quantization unit 220, and outputs sub-band sample data of each o...

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Abstract

A method of implementing an equalizer in an audio signal decoder and an apparatus therefor are provided. According to the method and apparatus, a signal output from an audio signal decoder is not processed by an equalizer, but the values of frequency components are adjusted according to a user's input before subband sample data is transformed into a frequency domain signal in an audio signal decoder, thereby implementing an equalizer in a codec. In this way, the complexity of implementing an apparatus for reproducing an audio signal can be reduced and delay of an equalizer can be reduced.

Description

technical field [0001] The method and device of the present invention relate to processing audio signals, in particular to a method for implementing an equalizer in a device for processing audio signals. Background technique [0002] FIG. 1 is a block diagram showing the structure of a conventional apparatus for audio signal reproduction according to the conventional art. [0003] The stream decoder 110 analyzes and parses a bit stream obtained by encoding an audio signal, and the inverse quantization unit 120 inverse quantizes a value output from the stream decoder 110 . [0004] The multi-channel decoder 130 decodes a value output from the inverse quantization slave unit 120, and outputs sub-band sample data of each of a plurality of channels. Subband coding is a well-known coding method used in various codecs (codecs) for coding efficiency, and a subband-coded audio signal is decoded in a plurality of subband units. The transform unit 140 generates information about com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02G10L19/26G10L21/02
CPCG10L19/26G10L19/0204H03G5/005G10L21/0205G10L21/0364G10L21/003G11B20/10H03M7/30
Inventor 吴宰源李健炯李雨郑钟勋李男淑
Owner SAMSUNG ELECTRONICS CO LTD