Loudspeaker system

Details Loudspeaker system Loudspeaker system

2004-12-17

2009-12-08

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

C381S116000, C381S055000, C381S123000, C381S189000, C381S120000, C330S051000, C330S298000

Reexamination Certificate

active

07630505

ABSTRACT:
There is provided a low-cost loudspeaker system which can adjust attenuation and provide protection against an excessive input. Between input terminals and a loudspeaker unit is provided a serial circuit including a plurality of resistor elements. A switch is provided which can switch between connected and disconnected states of two points, which includes one or more resistor elements of the serial circuit therebetween, through an over-current protection element.

REFERENCES:
patent: 3925709 (1975-12-01), Mitchell et al.
patent: 6163613 (2000-12-01), Cowans
patent: 6647120 (2003-11-01), Howze
patent: 2002/0085726 (2002-07-01), Fuqua
patent: 2002/0146135 (2002-10-01), Howze
patent: 52-100225 (1977-08-01), None
patent: 08-033087 (1996-02-01), None

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