Loudspeaker device

Details Loudspeaker device Loudspeaker device

2006-11-14

2006-11-14

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Loudspeaker feedback

C381S059000, C381S083000, C381S093000

Reexamination Certificate

active

07136495

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.

REFERENCES:
patent: 3798374 (1974-03-01), Meyers
patent: 6122385 (2000-09-01), Konno et al.
patent: 0 951 201 (1999-10-01), None
patent: 59-90491 (1984-05-01), None
patent: 7-162990 (1995-06-01), None
patent: 7-162990 (1995-06-01), None

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