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Method and apparatus for using time frequency related coding and/or decoding digital audio frequency

A digital audio and time-frequency technology, applied in the field of audio coding and/or decoding methods and devices thereof, can solve the problems of low bit rate, reduced output audio quality, etc.

Inactive Publication Date: 2006-04-05
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

because such as figure 1 The audio codec of the MP3 encoder shown performs encoding and decoding at a low bit rate, thus reducing the output audio quality

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  • Method and apparatus for using time frequency related coding and/or decoding digital audio frequency
  • Method and apparatus for using time frequency related coding and/or decoding digital audio frequency
  • Method and apparatus for using time frequency related coding and/or decoding digital audio frequency

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Embodiment Construction

[0037] Speech codecs and video codecs use temporal correlation between signal samples in order to compress data. Speech codecs use a linear predictive coefficient method to perform compression. Meanwhile, video codecs use motion measurements to perform temporal correlation.

[0038] In general, compressing data using temporal correlation is not suitable for audio codecs because the characteristics of audio signals are dynamic and have less temporal correlation. However, in the frequency transformed domain, each subband data signal is substantially static compared to those in the time domain. Therefore, a linear prediction method utilizing the correlation between frames is used in the frequency transform domain.

[0039] For example, in order to obtain a better compression ratio, MPEG-2 AAC performs linear prediction for each transform coefficient. Also, to remove long-term periodicity, MPEG-4 AAC uses a long-term predictor similar to the linear prediction method.

[0040] ...

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Abstract

An advanced digital audio encoding and / or decoding method and apparatus are provided. The digital audio encoding method involves (a) based on an input audio signal, generating a time-frequency band table; (b) based on the generated time-frequency band table, searching for a nearest neighbor block of a block being currently encoded, and generating information on the nearest neighbor block searched for; and (c) generating a bitstream containing the generated information on the nearest neighbor block.

Description

[0001] This application claims priority from Korean Patent Application No. 02-82380 filed December 23, 2002, the contents of which are hereby incorporated by reference in their entirety. technical field [0002] The present invention relates to a digital audio encoding and / or decoding method and a device for performing said method, in particular, the present invention relates to a method for improving the audio performance of prior art encoding and decoding devices by using time-frequency correlation of audio signals. Encoding and / or decoding method and device thereof. Background technique [0003] Audio encoders and decoders, ie audio codecs, are widely used because they enable users to send music files over the Internet at lower bit rates. Among audio codecs, an MP3 codec for sharing music files over the Internet and playing music files in portable audio players has become standard. The number of MP3 music files available on the Internet and the number of users sharing MP...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/02G10L19/00G10L21/02G11B20/10H03M7/30
CPCG10L21/038G10L19/0204G11B20/10
Inventor 马修·马努张基锡
Owner SAMSUNG ELECTRONICS CO LTD