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US 2007/0176684 A1Published application
Waveform equalizer and information reproducing apparatus therewith
AssigneeRohm Co., Ltd.
InventorKoji Nishikawa
Life of this patent
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Abstract
A waveform equalizer includes: a calculation circuit (7a) that permits free setting of the boost factor by which the gain, in a predetermined frequency range, for the input signal by varying the boost factor; and an all-pass filter (7b) that is connected to the stage preceding or following the calculation circuit, that has a first conductance amplifier and a second conductance amplifier, and that adjusts and thereby corrects the group delay characteristic of the input signal by varying the conductance of at least one of the first and second conductance amplifiers.
Claims7
A waveform equalizer comprising:
- a calculation circuit
- that permits free setting of a boost factor by which a gain, in a predetermined frequency range, for an input signal to the waveform equalizer is adjusted and
- that adjusts the gain for the input signal by varying the boost factor;
- and
- an all-pass filter
- that is connected to a stage preceding or following the calculation circuit,
- that has a first conductance amplifier and a second conductance amplifier, and
- that adjusts and thereby corrects a group delay characteristic of the input signal by varying a conductance of at least one of the first and second conductance amplifiers.
5 more elements
Dependencies are inferred from the claim text.