Electrical audio signal processing systems and devices – Having non-electrical feature – And loudspeaker
Patent
1997-07-08
2000-08-29
Lee, Ping
Electrical audio signal processing systems and devices
Having non-electrical feature
And loudspeaker
381118, 381120, 381334, H04R 102
Patent
active
061119687
ABSTRACT:
A sound production apparatus has a speaker, an amplifier circuit that includes at least one electron tube, and a portable housing that encloses the speaker and contains the amplifier circuit such that the speaker is fully enclosed within the housing. In a particular implementation the amplifier circuit includes an input connector, a first triode connected to the input connector, a gain adjustment variable resistance connected to the first triode, and a second triode, which second triode is connected to the gain adjustment variable resistance. A tone adjustment section has a treble tone adjustment variable resistance, a bass tone adjustment variable resistance, and a midrange adjustment variable resistance, all connected to the second triode. A volume adjustment variable resistance is connected to the tone adjustment section, a pentode is connected to the volume adjustment variable resistance, and a transformer is connected to the pentode. A chassis on which the amplifier circuit is mounted forms part of a back wall enclosing the speaker, and the triodes and pentode are mounted to the chassis such that they are on the outside of the back wall but the remainder of the amplifier circuit is on the inside of the back wall. Particular resistors and capacitors used in the amplifier circuit enable sufficient amplification without losing musical quality of the amplified signal.
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Gibson Guitar Corp.
Lee Ping
LandOfFree
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