Switch-tuned filters

Details Switch-tuned filters Switch-tuned filters

1980-10-20

1983-06-21

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

360 67, G11B 545, G11B 502

Patent

active

043896839

ABSTRACT:
A switch-tuned filter comprises a capacitive filter and a resonant filter both receiving an input signal to be filtered. The resonant filter comprises a gyrator the frequency response of which depends on circuit parameters in two circuit paths therein. A tuning switch is arranged to select the values of the parameters in each of these circuit paths. The output signals of the gyrator and the capacitive filter are combined to form the filtered output signal. The circuit can be used as an equalizer in a magnetic tape recorder.

REFERENCES:
patent: 3465321 (1969-09-01), Reisfeld
patent: 4091380 (1978-05-01), Yu

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