SPEECH ENCODING DEVICE AND METHOD, AND SPEECH DECODING DEVICE AND METHOD

PROBLEM TO BE SOLVED: To provide a speech encoding device and its method, and a speech decoding device and its method with which a scalable lossless stream can be generated and decoded and processing time when the lossless stream is generated and decoded can be shortened. SOLUTION: A lossy core enco...

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Bibliographic Details
Main Authors WATANABE HIDEAKI, ONUMA TAKASHI, FUJITA NORITERU, UCHINO MANABU, TOKURI YASUHIRO, AWABI KAIHO
Format Patent
LanguageEnglish
Published 08.02.2007
Subjects
ACOUSTICS
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
DECODING
ELECTRICITY
MUSICAL INSTRUMENTS
PHYSICS
SPEECH ANALYSIS OR SYNTHESIS
SPEECH OR AUDIO CODING OR DECODING
SPEECH OR VOICE PROCESSING
SPEECH RECOGNITION
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Summary:PROBLEM TO BE SOLVED: To provide a speech encoding device and its method, and a speech decoding device and its method with which a scalable lossless stream can be generated and decoded and processing time when the lossless stream is generated and decoded can be shortened. SOLUTION: A lossy core encoder part 11 irreversibly compresses an input speech signal to generate a core stream. A simplified lossy core decoder part 12 decodes only, for example, a low-frequency band of the core stream to generate a lossy decoded speech signal. A subtractor 14 subtracts the lossy decoded speech signal from a delayed input speech signal to generate a residue signal. A rounding processing part 15 performs processing for rounding the number of bits of the residue signal. A lossless enhanced encoder part 16 reversibly compresses the residue signal to generate an enhanced stream and a stream combining part 17 combines the core stream and enhanced stream together to generate the scalable lossless stream. COPYRIGHT: (C)2007,JPO&INPIT
Bibliography:Application Number: JP20050221524