Browse Prior Art Database

Floating Aperture for Up Down Counter

IP.com Disclosure Number: IPCOM000094633D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Brooks, EG: AUTHOR [+2]

Abstract

To provide an indication each time the count in main BCD counter 1 changes by a predetermined amount, either up or down, auxiliary counter 2 monitors the state of a selected digital position of 1. Counter 2 causes generation of an output pulse every time that position changes state a predetermined number of times. Such a device has application in, for example, data logging or data compression.

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Floating Aperture for Up Down Counter

To provide an indication each time the count in main BCD counter 1 changes by a predetermined amount, either up or down, auxiliary counter 2 monitors the state of a selected digital position of 1. Counter 2 causes generation of an output pulse every time that position changes state a predetermined number of times. Such a device has application in, for example, data logging or data compression.

Counting pulses received on input line 9 in conjunction with a count up signal on line 7 increment 1 upwardly. The signal on 7 also conditions And 6. A count down signal on line 8 conditions And 5 and causes the input pulses to increment 1 downwardly. Selecting switch 3 is set to the left so that the output of the low- order flip-flop of the one' s decade of 1 is connected to single-shot multivibrator 4. Each time the flip-flop changes state, 4 is triggered, sending a pulse through either 5 or 6 to increment 2 up or down. The binary count in 2 is initially set at ten. Whenever the inputs to 2 amount to a net upward advance of ten, And 11 is activated, generating an output pulse which can be used to set an indicating device, to initiate readout of 1, etc. This same pulse resets 2 to ten. If the inputs to 2 amount to a net decrease of ten, an output pulse is provided by And 12. By setting 3 to its center position to monitor the state of the low-order ten's flip-flop of 1, the output signal indicates that the count in 1 has changed by appr...