Title:
SOUND REPRODUCTION DEVICE
Document Type and Number:
Japanese Patent JP3260102
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To eliminate instability due to changes over aging and the change in an environment in the case of canceling sound radiated to the rear of a speaker for reproduction by the speaker.
SOLUTION: For this sound reproduction device, two speaker units 1 and 2 are arranged in front and back, a microphone 3 for error detection is installed in the middle and signals inputted to the speaker unit 2 on a back side are controlled by an applied filter 11 so as to cancel the sound radiated to the back by the speaker unit 1 in front. In this case, when power is supplied, the applied filter 11 is optimized for a prescribed time by power supply signals 16 and then, the filter 11 is fixed.
Inventors:
Junichi Hayakawa
Application Number:
JP16537697A
Publication Date:
February 25, 2002
Filing Date:
June 06, 1997
Export Citation:
Assignee:
Kenwood Corporation
International Classes:
H04R3/04; G10K11/178; H03H21/00; (IPC1-7): H04R3/04; G10K11/178; H03H21/00
Domestic Patent References:
| JP59094U | ||||
| JP548498U |
Attorney, Agent or Firm:
Masao Shibata