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Title:
AUDIO DECODER AND DECRYPTION METHOD
Document Type and Number:
Japanese Patent JP2017037328
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an audio encryption and decryption method and device of a signal obtained by mixing components having different sound sources.SOLUTION: An audio decoder includes: an ACELP module adapted to operate in a first encryption mode; a TCX module adapted to operate in a second encryption mode, which is different from the ACELP module; and a pitch filter 740 adapted to filter a preliminary audio signal generated by the ACELP module or the TCX module included in either the first encryption mode or the second encryption mode. The pitch filter is selectively enabled or disabled on the basis of a value of a first parameter encoded into an audio bit stream, and the first parameter is different from the second parameter encoded into the audio bit stream, and the second parameter designates the current encryption mode of the audio decoder.SELECTED DRAWING: Figure 7

Inventors:
BARBARA RESCH
KRISTOFER KJOERLING
LARS VILLEMOES
Application Number:
JP2016197150A
Publication Date:
February 16, 2017
Filing Date:
October 05, 2016
Export Citation:
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Assignee:
DOLBY INT AB
International Classes:
G10L19/00; G10L19/26; G10L25/90; G10L25/93; G10L19/02; G10L19/107; G10L19/20
Domestic Patent References:
JP2013533983A2013-08-29
JPH09261184A1997-10-03
JP2001147700A2001-05-29
Foreign References:
WO2010040522A22010-04-15
WO2007126015A12007-11-08
Attorney, Agent or Firm:
Tadashige Ito
Tadahiko Ito
Shinsuke Onuki



 
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