Dynamic magnetic information storage or retrieval – General processing of a digital signal – Pulse crowding correction
Patent
1975-05-07
1976-12-07
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Pulse crowding correction
G11B 509
Patent
active
039966143
ABSTRACT:
The invention relates to a device for reading digital information which is stored as a bivalent state of a moving carrier, for example, the magnetization direction of a tape. Reading causes a differentiating effect. A coil of the read member constitutes, in conjunction with a parallel connected capacitor, a resonant filter having a mediocre Q factor, so that the signal components of comparatively high frequency are slightly amplified. The output of the resonant filter has connected thereto an amplifier. A branch line for comparatively low frequencies with a filter having a drooping amplitude/frequency characteristic is connected to the amplifier. A branch line for comparatively high frequencies in which a filter having a rising amplitude/frequency characteristic is included is also connected to the amplifier. The channels are in phase-opposition with respect to each other, each channel comprising an output amplifier, the outputs of which are interconnected, so that an information signal can be reformed by adding. Detrimental effects due to successive transitions being situated near to each other are thus prevented.
REFERENCES:
patent: 3711843 (1973-01-01), Galuagni et al.
patent: 3840892 (1974-10-01), Hayashi
Canney Vincent P.
Cohen Simon L.
Trifari Frank R.
U.S. Philips Corporation
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