(19)
(11) EP 0 655 731 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.05.1997 Bulletin 1997/22

(43) Date of publication A2:
31.05.1995 Bulletin 1995/22

(21) Application number: 94118782.5

(22) Date of filing: 29.11.1994
(51) International Patent Classification (IPC)6: G10L 3/02
(84) Designated Contracting States:
DE FR GB NL

(30) Priority: 29.11.1993 JP 297176/93

(71) Applicant: NEC CORPORATION
Tokyo (JP)

(72) Inventor:
  • Ozawa, Kazunori, c/o NEC Corporation
    Tokyo (JP)

(74) Representative: VOSSIUS & PARTNER 
Siebertstrasse 4
81675 München
81675 München (DE)

   


(54) Noise suppressor available in pre-processing and/or post-processing of a speech signal


(57) In a noise suppressor capable of suppressing a noise signal before encoding or after decoding, a sequence of speech signals is rendered by the use of an inverse filter or a decoder into a sound source signal corresponding to the speech signal sequence. The noise signal is suppressed from the sound source signal by the use of feature parameters derived from the speech signal sequence. The noise signal can be suppressed within a speech duration and/or a non-speech duration by detecting the speech and the non-speech durations from the feature parameters.






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