Title:
VECTOR QUANTISATION DEVICE AND VECTOR QUANTISATION METHOD
Document Type and Number:
WIPO Patent Application WO/2011/048810
Kind Code:
A1
Abstract:
Disclosed is a vector quantisation device which can reduce the computational complexity of an audio codec without reducing the audio quality when encoding a wideband digital signal. A vector quantisation device (112) searches a codebook using code vectors, with which the impulse response of an audibility weighted synthesis filter is convolved and which configure the codebook, and target vectors. A filtering unit (201) applies a filter exhibiting a low pass and/or a high pass characteristic to the impulse response. If the filter has a high pass characteristic, a compaction unit (202) then compacts the degree of the post-filtering impulse response. A convolution unit (203) convolves the post-filtering impulse response with each of the code vectors. If the filter has a low pass characteristic, a search unit (204) thins out elements of the plurality of code vectors with which the impulse response has been convolved, and elements of the target vectors. The search unit (204) then carries out a search.
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Inventors:
MORII TOSHIYUKI
Application Number:
PCT/JP2010/006225
Publication Date:
April 28, 2011
Filing Date:
October 20, 2010
Export Citation:
Assignee:
PANASONIC CORP (JP)
MORII TOSHIYUKI
MORII TOSHIYUKI
International Classes:
G10L19/16; G10L19/09; G10L19/12; H03M7/30
Domestic Patent References:
| WO2006049179A1 | 2006-05-11 |
Foreign References:
| JPH0588699A | 1993-04-09 | |||
| JP2009241616A | 2009-10-22 | |||
| JP2010112374A | 2010-05-20 |
Other References:
"Source-Controlled-Variable-Rate Multimode Wideband Speech Codec (VMR-WB), Service options 62 and 63 for Spread Spectrum Systems", 3GPP2 C.S0052-A, April 2005 (2005-04-01)
Attorney, Agent or Firm:
WASHIDA, KIMIHITO (JP)
Koichi Washida (JP)
Koichi Washida (JP)
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