Low input signal bandwidth compressor and amplifier control circ

Details Low input signal bandwidth compressor and amplifier control circ Low input signal bandwidth compressor and amplifier control circ

1995-01-24

1996-04-23

Mottola, Steven

Amplifiers

With plural amplifier channels

Amplifying different frequencies in different channels

381106, 330 59, H03F 368, H03F 1700

Patent

active

055107524

ABSTRACT:
An amplifier circuit having a pre-amplifier responsive to a program input signal, a filter circuit, and an absolute value circuit. The pre-amplifier provides automated balancing between the high frequency channel signals and the mid range channel 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.

REFERENCES:
patent: 3714462 (1973-01-01), Blackmer
patent: 3789143 (1974-06-01), Blackmer
patent: 4097767 (1978-06-01), Blackmer
patent: 4327331 (1982-04-01), Yoshimi et al.
patent: 4403199 (1983-09-01), Blackmer
patent: 4409500 (1983-10-01), Welland
patent: 4482866 (1984-11-01), Crooks
patent: 4484345 (1984-11-01), Stearns
patent: 4638258 (1987-01-01), Crooks
patent: 4661851 (1987-04-01), Muterspaugh
Model 563X Hiss Reducer db.chi. Service Manual Including a Schematic 563X Main Led Board, 340654 Dated Nov. 5, 1987.

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