(19)
(11) EP 1 132 894 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.09.2001 Bulletin 2001/38

(43) Date of publication A2:
12.09.2001 Bulletin 2001/37

(21) Application number: 01108523.0

(22) Date of filing: 06.11.1997
(51) International Patent Classification (IPC)7: G10L 19/12
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 07.11.1996 JP 29473896
21.11.1996 JP 31032496
19.02.1997 JP 3458297
19.02.1997 JP 3458397

(62) Application number of the earlier application in accordance with Art. 76 EPC:
97911460.0 / 0883107

(71) Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Kadoma-shi, Osaka-fu 571 (JP)

(72) Inventors:
  • Yasunaga, Kazutoshi
    Kawasaki-shi, Kanagawa 216 (JP)
  • Morii, Toshiyuki
    Kawasaki-shi, Kanagawa 215-0015 (JP)
  • Watanabe, Taisuke
    Sagamihara-shi, Kanagawa 228 (JP)
  • Ehara, Hiroyuki
    Yokohama-shi, Kanagawa 233-0016 (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)

   


(54) Vector quantisation codebook generation method


(57) In a CELP type speech coder, the excitation is quantized by vectors from a random codebook. The random codebook is made of a fixed waveform storage section (181), followed by a vector rearranging unit (182). The rearranging section (182) shifts the vectors to positions determined to minimize the quantization distorsion using a pulse placement methodology of an algebraic coder. The vectors are then summed (183) to generate the excitation code vector.






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