Electrical audio signal processing systems and devices – With musical instrument
Reexamination Certificate
2003-03-20
2008-08-12
Mei, Xu (Department: 2615)
Electrical audio signal processing systems and devices
With musical instrument
C381S120000, C381S123000
Reexamination Certificate
active
07412064
ABSTRACT:
A guitar amplifier having at least one channel, each channel having a differential amplifier with first and second amplifying members, each amplifying member having a control element, an electron emitting element and an electron collecting element, the electron emitting elements of the amplifying members commonly coupled and an output amplifier coupled to the differential amplifier and having an output terminal selectively coupled to the control element of the second amplifying member of the differential amplifier as a feedback path. An input terminal coupled to the control element of the first amplifying member and a user-adjustable presence control circuit selectively coupled between the control element of the first amplifying member and ground to increase the perceived brightness, when selected. The presence control circuit includes a high pass filter disposed between the input terminal and ground to filter a selected high frequency portion of the signal received at the input terminal.
REFERENCES:
patent: 4290335 (1981-09-01), Sondermeyer
patent: 5131044 (1992-07-01), Brown et al.
patent: 5197102 (1993-03-01), Sondermeyer
patent: 6111961 (2000-08-01), Hedrick et al.
patent: 6522752 (2003-02-01), Smith
patent: 6724897 (2004-04-01), Smith
Mei Xu
White & Case LLP
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