Noise reduction/elimination apparatus for use with rotary head t

Details Noise reduction/elimination apparatus for use with rotary head t Noise reduction/elimination apparatus for use with rotary head t

1991-05-31

1994-04-12

Pascal, Robert J.

Dynamic magnetic information storage or retrieval

Modulating or demodulating

Frequency

360 32, 360 46, 360 53, 360 64, G11B 2006

Patent

active

053030931

ABSTRACT:
A noise reduction apparatus wherein a sampled digital data is compared with a first threshold value (t) to average the digital data during a period while the level of low frequency components containing jitter noises is a predetermined threshold level or lower, an averaging operation for the digital data after a predetermined number of sampling points continues if a difference value between previously and presently obtained digital data takes a second threshold value (tp) or lower, the averaged digital data obtained during a predetermined number of rotations of a rotary head is converted into an analog signal, and the analog signal is subtracted from a reproduced signal.

REFERENCES:
patent: 4677621 (1987-06-01), Sato
patent: 5095392 (1992-03-01), Shimazaki et al.
patent: 5150050 (1992-09-01), Genheimer

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