Title:
ACOUSTIC SIGNAL CODING DEVICE, DECODING DEVICE, METHOD FOR THESE AND PROGRAM RECORDING MEDIUM
Document Type and Number:
Japanese Patent JP3490324
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To realize a natural reproducing sound without reproducing an unpleasant sound by sending a characteristic of a background noise caught as a short time characteristic and a long time characteristic on a transmission parameter and reproducing both characteristics in a reproducing side.
SOLUTION: A reproduced sound signal is constituted of a whole or a part of signals generated in a drive sound source vector generation part 35, a background noise fluctuation component generation part 44 and a background noise steady component generation part 45. A model of a noise added to a regenerative signal expressed by a generation model of a sound is expressed with two components of a 'background noise fluctuation component' that a characteristic is fluctuated in a short time, and a 'background noise steady component' that the characteristic is fluctuated at a hourly slow period, or isn't fluctuated. A vector outputted from the background noise fluctuation component generation part 44 answers to the component that power and a spectrum characteristic are fluctuated by the unit of the frame of a background noise. The level of the background noise steady component is decided by a measured result of mean noise power, and is added with a nearly fixed level regardless of a mode at every frame.
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Inventors:
Naka Omuro
Kazunori Mano
Kazunori Mano
Application Number:
JP3542099A
Publication Date:
January 26, 2004
Filing Date:
February 15, 1999
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G10L13/00; G10L19/12; G10L19/18; G10L19/22; G10L25/78; G10L25/93; H04B14/04; (IPC1-7): G10L19/12; H04B14/04
Domestic Patent References:
| JP954600A | ||||
| JP8146998A | ||||
| JP9167000A |
Attorney, Agent or Firm:
Kusano Taku (1 person outside)