Title:
VOICED SOUND DECIDING METHOD
Document Type and Number:
Japanese Patent JP3221050
Kind Code:
B2
Abstract:
PURPOSE: To eliminate an offensive sound in MBE (multiband excited) encoding by generating a voiceless sound in the whole band in a block when the signal level of a block wherein a band decided as a voiced sound block is present is less than a 1st specific threshold value.
CONSTITUTION: Data of one block on a time base are converted by an orthogonal conversion part 13 into data of one block on a frequency axis and divided by a band division part 14 into plural bands, and a V/UV decision part 15 decides whether the sound is voiced or not, band by band. When it is judged that at least one band is a voiced sound band, a level detection part 18 detects the signal level of one block including the voiced sound band and supplies it to a comparison part 19. This comparison part 19 compares it with a threshold value supplied to an input terminal 20 and when the level is less than the threshold value, a decision part 21 judges the signal of the one block judged by the decision part 15 as the voiced sound band is a granular noise level, i.e., a mean amplitude less than 1LSB (least order digit).
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Inventors:
Masayuki Nishiguchi
Jun Matsumoto
Jun Matsumoto
Application Number:
JP12146192A
Publication Date:
October 22, 2001
Filing Date:
April 15, 1992
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G10L19/02; G10L19/038; G10L19/087; G10L25/93; (IPC1-7): G10L11/06; G10L19/02
Domestic Patent References:
| JP62271000A | ||||
| JP60107700A | ||||
| JP27100A | ||||
| JP285897A |
Attorney, Agent or Firm:
Akira Koike (2 outside)