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Title:
PITCH CYCLE SEARCH RANGE SETTING DEVICE AND PITCH CYCLE SEARCH DEVICE
Document Type and Number:
WIPO Patent Application WO/2003/015080
Kind Code:
A1
Abstract:
An adaptive sound source vector generator (ASSVG) (103) sets pitch cycles below and above the pitch cycle T0 of integer accuracy selected during the last sub-frame as a range for searching for a pitch frequency of fraction accuracy and extracts an adaptive sound source vector P(T-frac) having a pitch frequency T-frac of fraction accuracy in the range from an adaptive codebook (ACB) (102). A last sub-frame integer pitch cycle storage (LSFIPCS) (108) stores the integer component T0 of the optimum pitch cycle selected by a distortion comparator (DC) (107) and outputs the integer component T0 of the optimum pitch cycle to the adaptive sound source vector generator (ASSVG) (103) when searching for the pitch cycle of the next sub-frame. An optimum pitch frequency accuracy judge section (OPCAJS) (109) judges whether the optimum pitch frequency is of integer accuracy or of fraction accuracy. A comparison judge section (CJS) (110) limits the number of selections of pitch information of fraction accuracy as the optimum pitch cycle.

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Inventors:
SATO KAORU (JP)
YASUNAGA KAZUTOSHI (JP)
MORII TOSHIYUKI (JP)
Application Number:
PCT/JP2002/007850
Publication Date:
February 20, 2003
Filing Date:
August 01, 2002
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
SATO KAORU (JP)
YASUNAGA KAZUTOSHI (JP)
MORII TOSHIYUKI (JP)
International Classes:
G10L19/12; G10L25/90; H03M7/30; H03M7/36; (IPC1-7): G10L19/12; G10L11/04
Foreign References:
JPH0651800A1994-02-25
JPH07225599A1995-08-22
JPH0659698A1994-03-04
JPH096398A1997-01-10
JP2000330594A2000-11-30
JPH07248794A1995-09-26
Other References:
See also references of EP 1339043A4
Attorney, Agent or Firm:
Washida, Kimihito (Shintoshicenter Bldg. 24-1 Tsurumaki 1-chome Tama-shi, Tokyo, JP)
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