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Digital Pulse Frequency Detection

IP.com Disclosure Number: IPCOM000095989D
Original Publication Date: 1964-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Courselle, DF: AUTHOR

Abstract

An output signal from this system indicates whether or not variable input signals are recurring at a desired repetition rate.

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Digital Pulse Frequency Detection

An output signal from this system indicates whether or not variable input signals are recurring at a desired repetition rate.

Prior to operation, the circuitry is reset to produce an up level at terminal 12 and a down level at terminal 11 which indicates pulses recurring at other than the desired frequency. Variable frequency input pulses are introduced at 1 and simultaneously actuate multivibrators 2 and 3 and delay 4. Initial pulse 5 causes 2 to decondition And 8 and condition one input to And 9 while 3 deconditions 9. The next occurring pulse 6 arrives too long a period after 5 at which time 2 has lowered and 9 does not produce an output, thus maintaining 11 down and 12 up. Delay 4 prevents premature sensing of pulses by 8.

Pulses 14 and 15 are shown recurring at the desired repetition rate so that 15 occurs while both 2 and 3 are up, thus producing an output from 9 which sets latch 10. At that time, 12 lowers indicating the desired frequency has been attained while concurrently 11 rises conditioning one input of And 16. The other input to 16 is the output of integrator 17 which remains up until 2 is lowered. This conditioning of 16 by 11 and 17 holds 12 at the down level. That is, latch 10 is of the type in which the output 12 must be held down by a constant input to the set terminal, this being provided by 16.

If the next pulse after 15 arrived at a decreasing repetition rate, 2 would not be able to recover and 8 would remai...