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Binary Data Detection System

IP.com Disclosure Number: IPCOM000095671D
Original Publication Date: 1964-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Thompson, LH: AUTHOR [+2]

Abstract

A self-clocking detection system recovers binary information in pulse form from binary information represented by phase modulated signals. These signals can be derived from a magnetizable medium, on which data are NRZ recorded. Polarity reversals are at the centers of the cells, i. e., from - to + for 1 and from + to - for 0. The system has good noise rejection and tolerates considerable phase shifts.

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Binary Data Detection System

A self-clocking detection system recovers binary information in pulse form from binary information represented by phase modulated signals. These signals can be derived from a magnetizable medium, on which data are NRZ recorded. Polarity reversals are at the centers of the cells, i. e., from - to + for 1 and from + to - for 0. The system has good noise rejection and tolerates considerable phase shifts.

The signals supplied by read head 1 control dual amplifier 3 via differentiator
2. Amplifier 3 supplies complementary square waves A and A. Peak pulser 4 synchronizes sawtooth generator 5. This can be of the type described in IBM Technical Disclosure Bulletin, August 1962, p. 50. The synchronization is effected by peaks B at the zero crossings of wave A. The output of 5, wave C, switches trigger 7 via half interval pulse generator 6. Trigger 7 produces complementary waves D and D and, through dual spike generator 9, complementary spikes.

Waves A, A and D, D go to phase sensitive detector 8. This comprises two channels which test for equivalence A=D, A=D and exclusive comprises two channels which test for equivalence A=D, A=D and exclusive disjunction A=D, A=D and charge capacitors. These are discharged by spikes from spike generator 9. The outputs of detector 8 are wave E for 1's and wave F for 0's.

Voltage comparator 10 is basically a pair of coupled Schmitt trigger. Comparator 10 determines which of the two detector outputs is the larg...