Speaker apparatus

Details Speaker apparatus Speaker apparatus

2006-06-20

2006-06-20

Lee, Ping (Department: 2644)

Electrical audio signal processing systems and devices

Loudspeaker feedback

C381S059000

Reexamination Certificate

active

07065221

ABSTRACT:
A speaker apparatus in which a reproduced sound from a speaker unit is detected by a microphone and the reproduced sound from the speaker unit is corrected based on the detected signal. The speaker apparatus includes the speaker unit for reproducing an output signal from an amplifier, the microphone for detecting an acoustic output from the speaker unit, and a feedback circuit for feeding the detected acoustic output signal back to the input side of the amplifier. By placing the microphone near a position where sound pressure of at least one of a second and higher pipe resonance of an acoustic pipe is at minimum, an influence of the second and higher pipe resonance is reduced. As the influence of the second and higher pipe resonance is removed from the feedback circuit, stability of the feedback circuit is improved, and therefore, an acoustic characteristic of the speaker apparatus is improved.

REFERENCES:
patent: 5596311 (1997-01-01), Bess et al.
patent: 0 658 064 (1995-06-01), None
patent: 7-162990 (1995-06-01), None
patent: 9-205695 (1997-08-01), None

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