Title:
IMPROVED HIERARCHICAL CODING
Document Type and Number:
WIPO Patent Application WO/2013/057453
Kind Code:
A3
Abstract:
Improved hierarchical coding. The present invention relates to the binary allocation in a hierarchical coding/decoding comprising a coding/decoding of a digital signal enhancement layer. The signal comprises a succession of L samples, each sample being represented by a mantissa and an exponent. The method comprises the allocation of a predetermined number N
b
of enhancement bits to a part at least of the L samples of highest exponent values. In particular, the method comprises the steps: a) enumerating the exponents of the L samples each having a given value, b) calculating at least one aggregate of enumerations of exponents by decreasing values of exponent until the predetermined number N
b
is approximated from above, for c) determining a threshold value of largest exponent iexp0 of sample for which no more enhancement bit is available, and allocating the N
b
enhancement bits, according to chosen rules, to the samples whose exponent is greater than the aforesaid threshold value iexpo.
Inventors:
LAMBLIN CLAUDE (FR)
Application Number:
PCT/FR2012/052400
Publication Date:
June 13, 2013
Filing Date:
October 19, 2012
Export Citation:
Assignee:
FRANCE TELECOM (FR)
International Classes:
G10L19/002; G10L19/00; G10L19/24
Foreign References:
| EP2187387A2 | 2010-05-19 |
Attorney, Agent or Firm:
FRANCE TELECOM/OLNC/OLPS/IPL/PAT (38-40 rue du Général Leclerc, Issy Moulineaux Cedex 9, FR)
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