(19)
(11) EP 0 762 380 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.01.1998 Bulletin 1998/04

(43) Date of publication A2:
12.03.1997 Bulletin 1997/11

(21) Application number: 96306416.7

(22) Date of filing: 04.09.1996
(51) International Patent Classification (IPC)6: G10G 7/02
(84) Designated Contracting States:
DE FR GB

(30) Priority: 04.09.1995 JP 226896/95

(71) Applicant: PIONEER ELECTRONIC CORPORATION
Meguro-ku Tokyo-to (JP)

(72) Inventors:
  • Terada, Takahiko, c/o Pioneer Electronic Corp
    Tsurugashima-shi, Saitama-ken (JP)
  • Fukuda, Hiroaki, c/o Kogakuin University
    Hachioji-shi, Tokyo-to, 192 (JP)
  • Tohyama, Mikio, c/o Kogakuin University
    Hachioji-shi, Tokyo-to, 192 (JP)
  • Hirata, Yoshimutsu
    Hachioji-shi, Tokyo-to, 192 (JP)

(74) Representative: Brunner, Michael John et al
GILL JENNINGS & EVERY Broadgate House 7 Eldon Street
London EC2M 7LH
London EC2M 7LH (GB)

   


(54) Pitch detection apparatus and method for acoustic waveform


(57) An acoustic waveform is inputted to a pitch detection apparatus (1) for detecting a pitch of a fundamental wave of the acoustic waveform. The pitch detection apparatus (1) is provided with: an orthogonal function component output device (3) for taking, out of orthogonal function components for every cycle which compose the acoustic waveform, a plurality of orthogonal function components one after another in an order from one orthogonal function component having a greater energy contribution for the acoustic waveform than other orthogonal function components, and outputting the taken out orthogonal function components; and a pitch extract device (4) for extracting as a pitch one of the outputted orthogonal function components, on the basis of a mutual relationship between cycles of the outputted orthogonal function components.






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