Digital signal regulation system

Details Digital signal regulation system Digital signal regulation system

1978-07-03

1980-08-26

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329106, 307264, 375 22, H04L 2708

Patent

active

042198909

ABSTRACT:
A system is disclosed for regulating a digital signal which is modulated such that an average of their amplitude over a given interval varies from interval to interval, in a manner to maintain the average constant. The digital signal comprises a train of pulses formed by pulse tops and pulse bottoms both of which are equally spaced from a reference level and at least one of the pulse top and pulse bottom being greater than two pulse widths. Signals which are modulated in accordance with MFM, RZ and NRZ systems correspond to such a digital signal. In accordance with the invention, those pulse tops or the pulse bottoms of the digital signal which have a selected one of the pulse widths are maintained unchanged in amplitude from its original value while other pulse tops or bottoms having different pulse widths are compressed in inverse proportion to their respective pulse widths. The system of the invention produces correction pulses for algebraic addition to those portions having the different pulse widths. The correction pulses have pulse widths which are equal to those of said other pulse tops or bottoms and have an amplitude which is determined in accordance with the pulse width thereof.

REFERENCES:
patent: 3406343 (1968-10-01), Mehlman
patent: 3505609 (1970-04-01), Varsos et al.
patent: 3980826 (1976-09-01), Widmer

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