(19)
(11) EP 0 405 548 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.08.1991 Bulletin 1991/35

(43) Date of publication A2:
02.01.1991 Bulletin 1991/01

(21) Application number: 90112351.3

(22) Date of filing: 28.06.1990
(51) International Patent Classification (IPC)5: G10L 9/14
(84) Designated Contracting States:
DE FR GB

(30) Priority: 28.06.1989 JP 166180/89
30.06.1989 JP 168645/89
27.07.1989 JP 195302/89

(71) Applicant: FUJITSU LIMITED
Kawasaki-shi, Kanagawa 211 (JP)

(72) Inventors:
  • Taniguchi, Tomohiko
    Kohoku-ku, Yokohama-shi, Kanagawa 223 (JP)
  • Tanaka, Yoshinori
    Kawasaki-shi, Kanagawa 211 (JP)
  • Ohta, Yasuji
    Kohoku-ku, Yokohama-shi, Kanagawa 223 (JP)
  • Amano, Fumio
    Setagaya-ku, Tokyo 158 (JP)
  • Unagami, Shigeyuki
    Atsugi-shi, Kanagawa 243-01 (JP)
  • Sasama, Akira
    Fuji-shi, Shizuoka 417 (JP)

(74) Representative: Lehn, Werner, Dipl.-Ing. et al
Hoffmann, Eitle & Partner, Patentanwälte, Postfach 81 04 20
81904 München
81904 München (DE)


(56) References cited: : 
   
       


    (54) System for speech coding and apparatus for the same


    (57) A CELP type of speech signal coding system, wherein a code vector obtained by applying linear prediction to a vector of a residual speech signal of white noise stored in a code book and a pitch prediction vector obtained by applying linear prediction to a residual signal of a preceding frame given a delay corresponding to a pitch frequency are added, use is made of an impulse vector obtained by applying linear prediction to a residual signal vector of impulses having a predetermined relationship with the vectors of the white noise code book, variable gains are given to at least the above code vector and impulse vector, a reproduced signal is produced, and this reproduced signal is used for identification of the input speech signal, thus enabling the creation of a pulse series corresponding to the sound source of voiced speech sounds, enabling accurate evaluation and identification of a pulse-like sound source of voiced speech sounds and enabling improvement of the quality of the reproduced speech while reducing the amount of information transmitted.







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