公开(公告)号：US3624521A

公开(公告)日：1971-11-30

申请号：US3624521D

申请日：1970-06-19

Applicant: HONEYWELL INC

Inventor： DELLICICCHI ALFRED J

IPC: G11B20/14 ,  H03K13/00

CPC classification number: G11B20/1419

Abstract: A self-synchronizing read apparatus receives an encoded information pulse stream consisting of data and clock pulses from a random access device and applies this train across a normally inactive resonant tank circuit. The tank circuit generates a first reference signal and a detection circuit derives a reference clock waveform from predetermined reference points of the reference signal. The read apparatus further includes a generator circuit which generates a second linear reference signal from each of the pulses of the pulse stream and derives pulses of a data output waveform by applying the linear signals to a variable threshold switching circuit. The apparatus further includes circuits for generating an error voltage whose magnitude is proportional to the discrepancy in phase between the data train and reference signal and applies a correction voltage to the tank circuit which adjusts its frequency at a critically damped rate to decrease the discrepancy in phase.