Apparatus and method for encoding and decoding enhancement layer

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(11)

EP 2 187 387 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	25.01.2012 Bulletin 2012/04

(43)	Date of publication A2:
	19.05.2010 Bulletin 2010/20

(21)	Application number: 10153693.6

(22)	Date of filing: 18.08.2008

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International Patent Classification (IPC):

G10L 19/14^(2006.01)

G10L 19/00^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA MK RS

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Priority:

16.08.2007 KR 20070082346
18.03.2008 KR 20080024919
14.08.2008 KR 20080079929

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	08793289.3 / 2179415

(71)	Applicant: Electronics and Telecommunications Research Institute
	Daejeon-city 305-350 (KR)

(72)	Inventors:
	Sung, Jongmo 305-772, Daejeon-city (KR) Kim, Do-Young 305-755, Daejeon-city (KR)

(74)	Representative: Betten & Resch
	Patentanwälte Theatinerstrasse 8 80333 München 80333 München (DE)

(54)	Apparatus and method for encoding and decoding enhancement layer

(57) Provided is a method and apparatus for encoding and decoding an enhancement layer to reduce quantization error in a G.71 codec. Exponent indices of additional mantissa information of each samples are calculated based upon exponent information of each samples in a frame. A process of allocating 1 bit to each sample with a current exponent index is repeated, the exponent index starting from the maximum value while decreasing by 1 at every repetition until the total number of bits allocated to the samples is equal to the total number of available bits in the frame. And the most significant bits, as many as the number of bits allocated to each sample, are extracted from the additional mantissa information of each samples in the frame.

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