Electrical audio signal processing systems and devices – Including frequency control – Having automatic equalizer circuit
Patent
1986-10-08
1989-02-28
Isen, F. W.
Electrical audio signal processing systems and devices
Including frequency control
Having automatic equalizer circuit
381 86, 381 24, H03G 500
Patent
active
048093386
ABSTRACT:
A sound system comprises a source of program material, a transducer coupled to the source to produce an audible signal related to the program material, a controllable bass contour control network having a control terminal, a power amplifier, a second transducer and a low pass filter. The controllable bass contour control network is coupled to the program material source. The power amplifier is coupled to the controllable bass contour control network. The second transducer and the low pass filter are coupled to the power amplifier. The low pass filter is coupled to the control terminal of the controllable bass contour control network. The output of the lower pass filter controls the contour of the signal supplied from the program material source through the controllable bass contour control network to the power amplifier based upon the signal provided by the power amplifier to the low pass filter. The control terminal comprises a terminal of a light sensitive resistor. The low pass filter further comprises a light emitting device. The low pass filter is coupled to the control terminal of the controllable bass contour control network by coupling light from the light emitting device to the light sensitive resistor.
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Harman International Industries Incorporated
Isen F. W.
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