Pulse discrimination circuitry
Abstract
Abstract IN AN ARRANGEMENT FOR DISCRIMINATING A PULSE SIGNAL ON AN AMPLITUDE BASIS, THE THRESHOLD LEVEL AT WHICH AMPLITUDE DISCRIMINATION TAKES PLACE IS CHANGED FROM ONE VALUE TO ANOTHER DEPENDING UPON THE PATTERN OF THE PULSE SIGNAL. IN PARTICULAR TO NRZ DATA, A HIGH THRESHOLD LEVEL IS NORMALLY MAINTAINED. AFTER A PULSE IS SENSED AT THE HIGH THRESHOLD LEVEL, A LOW THRESHOLD LEVEL IS SUBSTITUTED FOR THE HIGH THRESHOLD LEVEL. AMPLITUDE DISCRIMINATION CONTINUES AT THE LOW THRESHOLD LEVEL AS LONG AS PULSES ARE SENSED IN EACH DATA BIT CELL. WHEN A GAP APPEARS IN THE PULSE PAT- TERN, I.E. PULSES FAIL TO APPEAR IN ONE OR MORE BIT CELLS, THE HIGH THRESHOLD LEVEL IS REESTABLISHED. BOTH ASYNCHRONOUS AND SYNCHRONOUS ARRANGEMENTS ARE DISCLOSED FOR DETERMINING THE OCCURRENCE OF A GAP IN PULSE PATTERN TO REESTABLISH THE HIGH THRESHOLD LEVEL.
Inventors
- 👤 John A Hibner
- 👤 Michael I Behr
Bibliographic Details
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