Equalizer amplifier
AssigneeNippon Gakki Seizo Kabushiki Kaisha
InventorMasaru Ida
Life of this patent
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Abstract
In an equalizer amplifier of RC attenuation type comprising an RC circuit having RIAA reproduction characteristics, the RC circuit is connected between an input of a first amplifier for amplifying an output signal of the RC circuit and an output of a second amplifier for amplifying an output signal of the first amplifier. One of the amplifiers is a noninverting amplifier, and the other is an inverting amplifier. So constituted, the equalizer amplifier increases apparently impedances of RC elements connected between the input of the first amplifier and the output of the second amplifier and permits the use of a capacitor of a smaller capacitance value which has good electrical characteristics.
Claims8
An equalizer amplifier circuit comprising:
- an RC circuit having frequency characteristics substantially identical with the RIAA reproduction characteristics, said RC circuit including:
- a first terminal to receive an input signal;
- a second terminal to deliver an output signal;
- and a third terminal;
- a first amplifier having:
- an input coupled to said second terminal of said RC circuit;
- and an output;
- and
- a second amplifier having:
- an input coupled to said output of said first amplifier;
- and an output coupled to said third terminal of said RC circuit;
- one of said first and second amplifiers being a noninverting amplifier and the other of said first and second amplifiers being an inverting amplifier.
Dependencies are inferred from the claim text.