Title:
収音方法および収音装置
Document Type and Number:
Japanese Patent JP3582712
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce distortion of the object sound components of an output without having to enlarge a device scale, in a sound pickup device. SOLUTION: Signals received by microphones 111 to 11M are supplied to a caller position estimating part 15A. The caller position estimating part 15A estimates the position of a caller. A delay control part 16 receives a caller position estimation result and sets delay by which the focus of a delay sum array faces the estimated caller position in delay units 121 to 12M. An inference part 18 for signal-to-noise ratio (SN ratio) infers the SN ratio. The inferred SN ratio is used for deciding a filter coefficient. An optimum filter calculation part 17 calculates optimum filter, so that the SN ratio of the output of the array and the distortion of the objective sound component become optimal and sets it in filters 131 to 13M. The signals, which pass through the filters 131 to 13M and are received by the microphones 111 to 11M, are added by an adder 14 and are outputted.
Inventors:
Kazunori Kobayashi
Kenji Kiyohara
Kenichi Furuya
Yutaka Kaneda
Kenji Kiyohara
Kenichi Furuya
Yutaka Kaneda
Application Number:
JP2000118069A
Publication Date:
October 27, 2004
Filing Date:
April 19, 2000
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G10L21/0208; G10L15/20; G10L15/28; H03H21/00; H04R3/00; (IPC1-7): H04R3/00; G10L15/20; G10L15/28; G10L21/02; H03H21/00
Domestic Patent References:
| JP11018194A | ||||
| JP7225595A | ||||
| JP9258768A | ||||
| JP8123495A |
Attorney, Agent or Firm:
Akio Miyazaki
Katsuhiro Ito
Katsuhiro Ito