Noise reduction apparatus

Details Noise reduction apparatus Noise reduction apparatus

1977-08-29

1979-04-03

Moffitt, James W.

Dynamic magnetic information storage or retrieval

Recording or reproducing an information signal and a control...

360 30, G11B 504

Patent

active

041480783

ABSTRACT:
Apparatus and method for reducing flutter noise in a frequency-modulated data stream, wherein the data stream is combined with a reference stream which has been modified by the fed-back result of the combination. Before combination, the data stream is transformed into a first rectangular-pulse stream in which amplitude is constant and frequency is dependent on the frequency of modulation of the data stream, whereas the reference stream is transformed into a second rectangular pulse stream of amplitude which is dependent on the fed-back result of the combination of the streams, and the frequency is dependent on the frequency of modulation of the reference stream.

REFERENCES:
patent: 2807797 (1957-09-01), Shoemaker
patent: 3012234 (1961-12-01), Burns
patent: 3697673 (1972-10-01), Dann

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