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Browse Prior Art Database

Electronic Dubbing of Timing Pulses

IP.com Disclosure Number: IPCOM000076684D
Original Publication Date: 1972-Apr-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Meier, JH: AUTHOR

Abstract

The reference numeral 10 designates a print belt having raised timing marks 12 at predetermined spaced intervals, which are sensed by a magnetic transducer 14 for producing timing pulses. Instead of having both odd and even numbered timing marks, it has been found convenient to omit every other timing mark of the belt 10.

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Electronic Dubbing of Timing Pulses

The reference numeral 10 designates a print belt having raised timing marks 12 at predetermined spaced intervals, which are sensed by a magnetic transducer 14 for producing timing pulses. Instead of having both odd and even numbered timing marks, it has been found convenient to omit every other timing mark of the belt 10.

Assuming that the odd timing marks are omitted on the belt, odd timing pulses are dubbed in between the even pulses from existing timing marks by having an oscillator 16 with a frequency on the order of 1 Megahertz and a frequency divider 18 which halves the frequency, connected to drive up and down counters 20 and 22 through ANDs 24a-d and ORs 26, 28, under the control of latches 30 and 32 which are operated by a flip-flop 34 from the transducer 14. The output is provided at OR 36.

At the instant of the pulse from timing mark 12-0 the output of the frequency divider is gated to counter 20 through OR 26 by AND 24a and latch 30, to start counting up from zero. At the instant of a pulse from timing mark 12-2, counter 20 is set for counting down and is connected to the oscillator through AND 24b to count down at twice the rate it had counted up. It thus reaches a zero count in half the time which elapsed between timing marks 0 and 2.

The zero count on the way down is detected and serves to produce a pulse which is dubbed in between pulses from timing marks 12-2 and 12-4, serving as timing pulse #3. The counter 20...