Back to results
US 3,940,709 AGranted
Equalization circuit
AssigneeAmpex Corporation
InventorAlastair M. Heaslett
Life of this patent
Estimating the term…
Abstract
A frequency equalization circuit includes an active filter circuit. The filter circuit differentiates the input signal. A plurality of adjustable resistances are connected to the differentiator corresponding to a plurality of operating or frequency ranges. A switch selects one resistance in accordance with one selected operating range to connect the filter circuit to an amplifier.
Claims13
An equalization circuit comprising;
- an input;
- amplifying means connected to said input;
- filter circuit means having an output connected to said input for providing a signal varying in amplitude with frequency at its output;
- a plurality of adjustable resistances corresponding to a plurality of operating ranges connected to the output of said filter circuit means for adjusting the signal amplitude provided by the output;
- and,
- switch means for selectively connecting one of said plurality of adjustable resistances to said amplifying means according to one selected operating range.
3 more elements
An equalization circuit comprising:
- an input terminal;
- a first amplifier having an input and an output;
- an input resistance connected between said input terminal and the input of said first amplifier;
- and,
- a filter circuit connected in parallel with said input resistance including:
- circuit means having an output to filter a signal received at said input terminal;
- a plurality of adjustable resistances connected to the output of said filter circuit means, each of said resistances selected according to a different one of a plurality of operating ranges for adjusting the amplitude of the signal provided by said filter circuit means;
- and,
- switch means connected between said plurality of adjustable resistances and the input of said first amplifier for selectively connecting said adjustable resistances to said first amplifier.
6 more elements
Dependencies are inferred from the claim text.