Title:
DECODER, ENCODER, AND METHODS THEREOF
Document Type and Number:
WIPO Patent Application WO/2011/155144
Kind Code:
A1
Abstract:
Disclosed is a decoder capable of improving the sound quality of a decoded sound signal in an encoding method which combines encoding appropriate for speech signals and encoding appropriate for music signals in a hierarchical structure. In this decoder, a transform-encoding decoding unit (202) decodes transform-encoded data to generate a spectrum of a decoded transform-encoded signal. A band decision unit (203) uses the spectrum of the decoded transform-encoded signal to decide whether each of a plurality of bands in which frequency components of an input signal are divided constitute a first band in which a transform encoded pulse is not established or a second band in which said pulse is established. A CELP component suppression unit (207) suppresses the spectrum of a CELP decoded signal, which is the frequency component of a decoded signal of CELP encoded data, to the extent that suppression in the first band is weaker than suppression in the second band.
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Inventors:
KAWASHIMA, Takuya (())
河嶋拓也 (())
河嶋拓也 (())
Application Number:
JP2011/002965
Publication Date:
December 15, 2011
Filing Date:
May 27, 2011
Export Citation:
Assignee:
PANASONIC CORPORATION (1006, Oaza Kadoma Kadoma-sh, Osaka 01, 〒5718501, JP)
パナソニック株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 〒5718501, JP)
KAWASHIMA, Takuya (())
パナソニック株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 〒5718501, JP)
KAWASHIMA, Takuya (())
International Classes:
G10L19/14; G10L19/02; H03M7/30
Attorney, Agent or Firm:
WASHIDA, Kimihito (8th Floor, Shinjuku First West Bldg. 1-23-7, Nishi-Shinjuku, Shinjuku-k, Tokyo 23, 〒1600023, JP)
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Claims: