Pulse or digital communications – Repeaters – Testing
Patent
1982-11-15
1985-03-05
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
358 37, 358166, 375 98, 375 99, H04N 514
Patent
active
045035474
ABSTRACT:
A circuit arrangement for improving the shape of a data pulse waveform prior to data slicing by correcting a reduction of the high frequency content of the waveform using an adaptive crispening technique. The arrangement includes a high-pass filter (1) connected to an input (8) at which the waveform is applied. The filter (1) separates the high frequency content which is multiplied by an amplitude correcting signal in a multiplier (2). The data pulse waveform signal and the multiplier output are added in an adder (6) to produce a resultant output waveform, which is fed to a data slicer (10). The resultant output waveform is also applied to a peak-to-peak detector (3) via a switch (7) when the latter is closed periodically by a timing circuit (5). The detector (3) produces a control signal proportional to the amplitude of the resultant output waveform which it receives via the switch (7). A subtractor (4) produces the amplitude correcting signal as the difference between the control signal and a reference signal (RF).
REFERENCES:
patent: 4030121 (1977-06-01), Faroudja
patent: 4386369 (1983-05-01), Shanley et al.
patent: 4437124 (1984-03-01), Cochran
Briody Thomas A.
Goodman Edward W.
Safourek Benedict V.
Streeter William J.
U.S. Philips Corporation
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