Robust quantization with efficient WMSE search of a sign-shape codebrook using illegal space

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EP 1 293 967 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	25.08.2004 Bulletin 2004/35

(43)	Date of publication A2:
	19.03.2003 Bulletin 2003/12

(21)	Application number: 02255723.5

(22)	Date of filing: 16.08.2002

(51)	International Patent Classification (IPC)⁷: G10L 19/06

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

16.08.2001 US 312543 P
07.06.2002 US 163378
07.06.2002 US 163995
07.06.2002 US 163344

(71)	Applicant: Broadcom Corporation
	Irvine, CA 92618-3616 (US)

(72)	Inventor:
	Thyssen, Jes Laguna Niguel, California 92677 (US)

(74)	Representative: Jehle, Volker Armin, Dipl.-Ing.
	Patentanwälte Bosch, Graf von Stosch, Jehle, Flüggenstrasse 13 80639 München 80639 München (DE)

(54)	Robust quantization with efficient WMSE search of a sign-shape codebrook using illegal space

(57) A method of searching a signed codebook to quantize a vector includes weighting a shape codevector in a set of shape codevectors with a weighting function for a Weighted Mean Square Error (WMSE) criteria, to produce a weighted shape codevector. The method further includes correlating the weighted shape codevector with the vector to produce a weighted correlation term. The method also includes determining, based on a sign of the weighted correlation term, a preferred one of a positive and a negative signed codevector associated with the shape codevector. The method further includes determining whether one of the signed codevectors does not belong to an illegal space defining illegal vectors.

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