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Data processing method by passage between different sub-band domains

A sub-band, data processing technology, used in the field of transcoding

Inactive Publication Date: 2007-11-07
FRANCE TELECOM SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem generally posed in these multiplexing transformation systems is to reconstruct the original signal without distortion after TDM->FDM->TDM operation

Method used

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  • Data processing method by passage between different sub-band domains
  • Data processing method by passage between different sub-band domains
  • Data processing method by passage between different sub-band domains

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Embodiment Construction

[0093] The method of switching between subband domains is described below in a manner generally representative of the present invention.

[0094] The L-band synthesis set used by the first compression coding system and defined by its filters, denoted F k (z), 0≤k≤L-1, and the M-band analysis filterbank used in the second compression system and defined by its filters, denoted H n (z), 0≤n≤M-1. As described below, assume that the two filter banks used in the two compression systems are decimation-first systems (or "critical sampling systems").

[0095] With X(z)=[X 0 (z)X 1 (z)...X L-1 (z))] T and Y(z)=[Y 0 (z)Y 1 (z)...Y M-1 (z)] T to denote the signal vectors representing the subbands of the signal in the domain of the first and second filter banks, respectively.

[0096] Figures 5a and 5b illustrate the principle of switching between subband domains. Including finding a system 51 corresponding to the cascade of the synthesis group BS1 and the analysis group BA2 (Fi...

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Abstract

The invention concerns data processing by passage between different subband domains, of a first number L to a second number M of subband components. After determining a third number K, least common multiple between the first number L and the second number M: a) if K is different from L, it consists in arranging in blocs, by a serial / parallel conversion, an input vector X(z) to obtain p 2.

Description

technical field [0001] The present invention relates to data processing by switching between different subband domains, in particular, but not in any way exclusive, to a transcoding between two types of compression encoding / decoding. Background technique [0002] The current development of digital encoding formats for multimedia signals allows high compression rates. Furthermore, the increase in the capacity of transmission and access networks ensures that a large amount of digital multimedia content (speech, audio, images, video, etc.) is used by the public every day. The content is consumed on various types of terminals (computers, mobile terminals, personal assistants (PDAs), television decoding terminals ("set-top boxes"), etc.) and over various types of networks (IP, ADSL, DVB, UMTS, etc. etc.) to achieve. This access by users to multimedia content must be done in a transparent manner on these various terminals and across these networks. Then someone proposed "univer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/14G10L19/02G10L19/16H04N19/33H04N19/40H04N19/42H04N19/436H04N19/59H04N19/60H04N19/625H04N19/63H04N19/80H04N19/91
CPCG10L19/0204G10L19/173
Inventor 阿卜杜勒拉蒂夫·本杰罗恩图伊米
Owner FRANCE TELECOM SA