Amplifiers – With plural amplifier channels – Amplifying different frequencies in different channels
Patent
1996-04-22
1998-04-07
Mottola, Steven
Amplifiers
With plural amplifier channels
Amplifying different frequencies in different channels
381106, H03F 368, H03G 700
Patent
active
057368970
ABSTRACT:
A state-variable pre-amplifier responsive to a program input signal drives a filter circuit, and an absolute value circuit. The state-variable pre-amplifier uses a state-variable filter to provide a compensated signal at an output. The compensated signal has compensated high, low and mid-range frequency signal components. The pre-amplifier has a first amplifier stage for providing a high frequency compensated signal. A second amplifier stage provides a mid-range frequency compensated signal. A third amplifier stage provides a low range frequency compensated signal. An adjusting means adjusts the balance between at least two of the three frequency compensated signals. A summing circuit adds the three compensated signals to form the compensated signal. A balance means adjusts the balance between the high frequency, the mid-range and the low frequency compensated signals to provide a compensated signal. The filter circuit is coupled to receive and automatically filter the compensated signal to provide an output signal and a modified compensated signal. The filter circuit has an adjustable bandwidth that is automatically adjusted in response to the control signal for automatically reducing the bandwidth of the filter circuit in response to lower values of the control signal to obtain the output signal. The filter circuit uses a voltage controlled amplifier or a photo cell in combination with an integrator. An absolute value circuit senses the modified compensated signal and provides a control signal proportional to the average peak value of the amplitude of the modified compensated signal.
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Model 563X Hiss Reducer dbx Service Manual Including A Schematic 563X Main Led Board, 340654 Dated Nov. 5, 1987.
BBE Sound Inc.
Mottola Steven
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