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Method and apparatus to encode and decode an audio signal

An audio signal and audio coding technology, applied in pulse modulation TV signal transmission, speech analysis, code conversion, etc., can solve problems such as monotonous output sound, change of pitch, and reduction of sound clarity

Inactive Publication Date: 2006-05-03
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
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Problems solved by technology

However, this loss of the high frequency band alters the pitch and reduces the clarity of the sound, giving a monotonous, suppressed output sound

Method used

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  • Method and apparatus to encode and decode an audio signal
  • Method and apparatus to encode and decode an audio signal
  • Method and apparatus to encode and decode an audio signal

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Embodiment Construction

[0022] Embodiments of the present general inventive concept will now be described in detail, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The embodiments are described below in order to explain the present general inventive concept by referring to the figures.

[0023] figure 1 is a block diagram showing an audio encoding device according to an embodiment of the present general inventive concept.

[0024] refer to figure 1 , the preprocessor 110 determines the similarity between frames of the input audio signal, and if the similarity is greater than a predetermined value, modifies the corresponding frame audio signal with respect to the time scale, and generates a frame time scale modification flag.

[0025] The encoder 120 encodes the audio signal preprocessed by the preprocessor 110 into audio data based on a psychoacoustic model.

[0026] The packing unit 130 constructs a signal output ...

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Abstract

An audio encoding / decoding method and apparatus for reproducing high-quality audio signals without loss of high-frequency bands by using time-scale compression / expansion. The method includes encoding an input audio signal into audio data by determining similarities between frames of the input audio signal, compressing the input audio signal with respect to time stamping, generating frame time stamp modification flags, and then based on the frames The time stamp modification flag decodes the audio data of the encoded audio signal.

Description

[0001] This application claims priority to Korean Patent Application No. 2004-85806 filed with the Korean Intellectual Property Office on Oct. 26, 2004, the entire disclosure of which is hereby incorporated by reference. technical field [0002] The present general inventive concept relates to an audio encoder / decoder (codec), and more particularly, to an audio encoding / decoding method and apparatus that can reproduce high-quality audio signals using time-scale compression / expansion without losing the high frequency band. Background technique [0003] Moving Picture Experts Group-1 (MPEG-1) is a standard related to digital video and audio compression, which is supported by the International Organization for Standardization (ISO). MPEG-1 audio is used to compress an audio signal with a sampling rate of 44.1KHz, which is stored on a CD with a capacity of 60 to 72 minutes, and the MPEG-1 audio is based on the complexity of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/30G10L19/02H04N7/24
CPCG10L21/04G10L19/02G10L21/02
Inventor 吴润学
Owner SAMSUNG ELECTRONICS CO LTD
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