| 摘要 |
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.
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