Robust quantization and inverse quantization using illegal space

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EP 1 293 965 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	18.08.2004 Bulletin 2004/34

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

(21)	Application number: 02255719.3

(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. et al
	Patentanwälte Bosch, Graf von Stosch, Jehle, Flüggenstrasse 13 80639 München 80639 München (DE)

(54)	Robust quantization and inverse quantization using illegal space

(57) A quantizer for quantization of a vector comprises a codevector generator that generates a set of candidate codevectors and a memory for storing an illegal space definition representing illegal vectors. The quantizer also includes a legal status tester that determines legal candidate codevectors among the set of candidate codevectors using the illegal space definition, and a codevector selector that determines a best legal candidate codevector among the one or more legal candidate codevectors. The vector includes parameters relating to a speech and/or audio signal, such as Line Spectral Frequencies (LSFs).

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