Digital signal detecting apparatus

Details Digital signal detecting apparatus Digital signal detecting apparatus

1991-01-14

1992-11-24

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 51, G11B 509

Patent

active

051668360

ABSTRACT:
A digital signal detecting apparatus for reproducing high-density digital signals which are recorded on recording media in systems for processing digital signals such as digital VTR's, comprises a rectifier for rectifying a negative voltage of the signal reproduced through a recording head, a reproducing amplifier and an equalizer into a positive voltage; a comparator for generating a rectangular waveform by comparing the output signal of the rectifier with a reference signal; a frequency multiplier for multiplying the reproduced signal which is inputted as a level-controlled state by a PLL (Phase Locked Loop) for outputting the synchronized clock signal by comparing the phase of the signal outputted from the frequency multiplier with the phase of the frequency-divided signal thereof; and a data detector for detecting the original digital data signal from the signal outputted from the comparator by utilizing the clock signal fed from the PLL, for outputting NRZ (Non-Return to Zero) digital data signal to be demodulated in the demodulator.

REFERENCES:
patent: 4716475 (1987-12-01), Dutcher

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