Title:
【発明の名称】雑音低減装置
Document Type and Number:
Japanese Patent JP3381731
Kind Code:
B2
Abstract:
PURPOSE:To prevent a desired voice itself from being reduce even in the case a voice which is not an objective one comes from a desired voice direction and mixed with a reference input in a noise reducing device. CONSTITUTION:The output signal of a 1st microphone 11 for collecting the desired voice is supplied to a subtracting means 15. The output signal of a 2nd microphone 21 which is low in sensitivity in the arrival direction f the desired voice is supplied to the subtracting means 15 through an adaptive filter means 24. The subtracting means 15 subtracts the output signal of the adaptive filter means from the output signal of the 1st microphone 11. The adaptive means is so adjusted as to minimize the output power of the subtracting means. The weighting coefficient of the coefficient multiplier of the adaptive filter means is monitored and when the weighting coefficient exceeds a value at which even a voice from the desired voice direction is also reduced, the adaptive processing of the adaptive filter means is limited.
Inventors:
Kaoru Gyotoku
Toru Sasaki
Hitoshi Ohkubo
Takayuki Mizuuchi
Toru Sasaki
Hitoshi Ohkubo
Takayuki Mizuuchi
Application Number:
JP23904592A
Publication Date:
March 04, 2003
Filing Date:
August 14, 1992
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G10L15/20; G10L21/0208; H03H17/00; H03H17/02; H03H21/00; H04B3/04; H04R1/40; H04R3/00; (IPC1-7): G10L15/20; G10L21/02; H03H21/00; H04R3/00
Domestic Patent References:
| JP61194913A | ||||
| JP5119794A |
Attorney, Agent or Firm:
Masami Sato