Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1976-10-08
1978-02-28
Claffy, Kathleen H.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
179 1VL, 330254, H03G 510, H03G 310, H03F 345
Patent
active
040769593
ABSTRACT:
Control circuitry for a multi-channel audio system is disclosed which includes left and right signal processing channels and a DC control section. Each processing channel includes balance and volume sections which are connected with the DC control circuitry and controlled from respective balance and volume potentiometers connected with the DC control section. Each channel further includes a tone control section and more specifically treble and bass sections connected with the DC control circuitry and controlled from a tone potentiometer. The response of the bass section is also controlled as a function of the setting of the volume potentiometer to achieve a loudness function. The volume control circuitry is designed to produce a linear relationship between the DC control voltage and signal attenuation as measured in decibels. Current steering circuitry is employed in both amplitude and tone control.
REFERENCES:
patent: 3725583 (1973-04-01), Gunderson et al.
patent: 3769459 (1973-10-01), Niffenegger et al.
patent: 3849601 (1974-11-01), Goncharoff
patent: 3870964 (1975-03-01), Mills
patent: 3875334 (1975-04-01), Hilbert et al.
patent: 3908172 (1975-09-01), Aschermann et al.
patent: 3937885 (1976-02-01), Gay
patent: 3949325 (1976-04-01), Berkovitz
"Semiconductor Data Library", vol. 6, series B, Motorola, Inc., 1976, pp. 7-169 to 7-171.
"An Integrated Quadraphonic DC Volume Control", John E. Hanna, IEEE Trans. BTR, vol. BTR-20, No. 1; pp. 15-31, Feb. 1974.
Gilbert William F.
Schertz Burtron D.
Wilkinson Lester
Chayt Kenneth A.
Claffy Kathleen H.
Duke Albert F.
General Motors Corporation
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