Apparatus for use in recording a pulse signal on a magnetic reco

Details Apparatus for use in recording a pulse signal on a magnetic reco Apparatus for use in recording a pulse signal on a magnetic reco

1979-12-26

1982-06-08

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Modulating or demodulating

Frequency

360 25, G11B 504, G11B 1502

Patent

active

043342493

ABSTRACT:
Apparatus is described which is particularly useful for recording pulse signals on a magnetic recording medium. The apparatus includes an amplitude modulator, preferably a balanced modulator, that is supplied with the pulse signal and with a carrier upon which the pulse signal is amplitude-modulated. The pulse signal has gradually rising and falling edges which exhibit a maximum gradient. The modulated carrier is substantially fully suppressed when the maximum gradient of the pulse signal traverses a predetermined level. Preferably, the modulation factor of the amplitude modulator is greater than unity. When used with additional recording apparatus, the balanced modulated signal is filtered by a vestigial sideband filter, and the filtered, balanced modulated signal is frequency-converted to a lower frequency band. The frequency-converted balanced modulated signal is superimposed with an AC bias signal and then recorded.

REFERENCES:
patent: 4077046 (1978-02-01), Morio
patent: 4115820 (1978-09-01), Morio et al.

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