Speech coder.

Abstract

A speech coder includes an LPC analyzer, a difference signal generating section, a first code book, a second code book, and a multiplexer. The LPC analyzer divides an input discrete speech signal into signal components in units of frames each having a predetermined time length, and obtains a spectrum parameter representing a spectrum envelope of the speech signal. The difference signal generating section obtains a difference signal by dividing the frame into subframes each having a predetermined time length, and predicting a pitch parameter representing a long-term correlation on the basis of a past sound source signal. The first code book stores a signal formed beforehand by learning based on the difference signal. The second code book stores a signal having predetermined characteristics or a signal formed beforehand by learning. The multiplexer represents a sound source signal of the speech signal by a linear combination of a signal selected from the first code book in accordance with each obtained difference signal and a signal selected from the second code book, and outputs the combination.

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Technology	Declaration Information			Specification Information	Explicitly Disclosed	Patent Type
Technology	Declaration Date	Declaration Reference	Declaring Company	Specification Number	Explicitly Disclosed	Patent Type
2G	13/01/1997	ISLD-190001-044	NEC CORP	S1 TS Number: TS 106 20 Version No: Illustrative part: ---- Release: + -	No	Family Member
2G	13/01/1997	ISLD-190001-044	NEC CORP	S1 TS Number: TS 106 20 Version No: Illustrative part: ---- Release: + -	Yes	Basis Patent

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Publication No	Technology	Declaration Information			Specification Information	Explicitly Disclosed	Patent Type
Publication No	Technology	Declaration Date	Declaration Reference	Declaring Company	Specification Number	Explicitly Disclosed	Patent Type
EP0443548A2	2G	13/01/1997	ISLD-190001-044	NEC CORP	S1 TS Number: TS 106 20 Version No: ---- Section No: ---- Release : ---- + -	Yes	Basis Patent
EP0443548A2	2G	13/01/1997	ISLD-190001-044	NEC CORP	S1 TS Number: TS 106 20 Version No: ---- Section No: ---- Release : ---- + -	No	Family Member
EP0443548A3	2G	13/01/1997	ISLD-190001-044	NEC CORP	S1 TS Number: TS 106 20 Version No: ---- Section No: ---- Release : ---- + -	Yes	Basis Patent
EP0443548A3	2G	13/01/1997	ISLD-190001-044	NEC CORP	S1 TS Number: TS 106 20 Version No: ---- Section No: ---- Release : ---- + -	No	Family Member
US5208862A	2G	13/01/1997	ISLD-190001-044	NEC CORP	S1 TS Number: TS 106 20 Version No: ---- Section No: ---- Release : ---- + -	Yes	Basis Patent
US5208862A	2G	13/01/1997	ISLD-190001-044	NEC CORP	S1 TS Number: TS 106 20 Version No: ---- Section No: ---- Release : ---- + -	No	Family Member
DE69133296T2	2G	13/01/1997	ISLD-190001-044	NEC CORP	S1 TS Number: TS 106 20 Version No: ---- Section No: ---- Release : ---- + -	No	Family Member

Publication No	Technology	Declaration Information			Specification Information				Explicitly Disclosed	Patent Type	Status	National Phase Entries
Publication No	Technology	Declaration Date	Declaration Reference	Declaring Company	Specification Information				Explicitly Disclosed	Patent Type	Status	National Phase Entries
-----	-----	-----	-----	-----	S1 TS Number: ----- Version No: ----- Section No:----- Release:----- + -				-----	-----	-----	-----

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Patent number:EP0443548B1

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Price: 200 €

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