Title:
AUDIO ENCODING DEVICE AND AUDIO ENCODING METHOD
Document Type and Number:
WIPO Patent Application WO/2008/018464
Kind Code:
A1
Abstract:
Provided is an audio encoding device capable of improving performance of an adaptive codebook
and improving quality of a decoded audio. In this audio encoding device, an adaptive
codebook (113) cuts out one specified by a comparison unit (117) from adaptive
code vectors stored in an internal buffer and outputs it to a filtering unit (101)
and a switching unit (121). The filtering unit (101) performs a predetermined filtering
process on the adaptive sound source signal and outputs the obtained adaptive
code vector to the switching unit (121). According to an instruction from the
comparison unit (117), the switching unit (121) outputs the adaptive code vector
directly outputted from the adaptive codebook (113) to a gain adjusting unit
(115) when the adaptive codebook (113) is searched and outputs the adaptive code
vector outputted from the filtering unit (101) after being subjected to the filtering
process to the gain adjusting unit (115) when a fixed sound source is searched
after the adaptive sound source search.
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Inventors:
MORII, Toshiyuki (())
Application Number:
JP2007/065452
Publication Date:
February 14, 2008
Filing Date:
August 07, 2007
Export Citation:
Assignee:
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1006, Oaza Kadoma Kadoma-sh, Osaka 01, 5718501, JP)
松下電器産業株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 5718501, JP)
松下電器産業株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 5718501, JP)
International Classes:
G10L19/08; H03M7/30
Attorney, Agent or Firm:
WASHIDA, Kimihito (5th Floor, Shintoshicenter Bldg. 24-1, Tsurumaki1-chome, Tama-sh, Tokyo 34, 2060034, JP)
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