Title:
スピーカ装置
Document Type and Number:
Japanese Patent JP4224892
Kind Code:
B2
Abstract:
A loudspeaker device comprising a power amplifier ( 13 ) to which an input signal is delivered via a subtracter ( 6 ), a speaker unit ( 1 ) for reproducing output signals delivered from the power amplifier ( 13 ), an acoustic pipe ( 2 ) coupled in front of the speaker unit for guiding the sound waves, a microphone ( 4 ) for detecting an acoustic outputs radiated from the speaker unit, a microphone amplifier ( 5 ) for amplifying an acoustic output signals detected by the microphone, and a negative feedback circuit. Output signals of the microphone amplifier are delivered to the subtracter, at the same time the same output signal is connected to a high-pass filter ( 7 ) to be delivered to the subtracter. Thus the negative feedback circuit is formed to suppress peaks and dips for providing a flattened sound pressure frequency characteristic.
Inventors:
Hidekazu Tanaka
Fumiyasu Konno
Fumiyasu Konno
Application Number:
JP13819199A
Publication Date:
February 18, 2009
Filing Date:
May 19, 1999
Export Citation:
Assignee:
Panasonic Corporation
International Classes:
H04R1/02; H04R3/04; H04R3/00
Domestic Patent References:
| JP7222276A | ||||
| JP7162990A | ||||
| JP4348699A | ||||
| JP3244299A | ||||
| JP3187599A | ||||
| JP61098096A | ||||
| JP2147994U | ||||
| JP55109990U |
Attorney, Agent or Firm:
Fumio Iwahashi
Hiroki Naito
Daisuke Nagano
Hiroki Naito
Daisuke Nagano
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