Sound reproduction apparatus with stable feedback

Details Sound reproduction apparatus with stable feedback Sound reproduction apparatus with stable feedback

1997-07-15

2000-09-19

Lee, Ping

Electrical audio signal processing systems and devices

Loudspeaker feedback

381 59, 381 56, H04R 300

Patent

active

061223859

ABSTRACT:
The object of the present invention is to offer an sound reproduction apparatus equipped with a speaker having a drastically improved acoustic characteristics securing a stable and high S/N ratio over a wide frequency range. In order to accomplish these objects, the inputted audio signal is amplified by a power amplifier and is reproduced in an acoustic output by driving a speaker, and the reproduced acoustic output is detected by a microphone disposed in a closed cabinet together with said speaker and the detected signal is amplified by a microphone amplifier and is processed by a filter. Then, the output signal from said filter and the input signal to said power amplifier are added and processed, and the difference signal between the added signal and said inputted audio signal is used as an input signal to said power amplifier constituting a negative feedback circuit accomplishing the objects of this invention.

REFERENCES:
patent: 4180706 (1979-12-01), Bakgaard
patent: 4395588 (1983-07-01), Franssen et al.
patent: 5559891 (1996-09-01), Kuusama et al.

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