On Wed, 28 Jan 1998 19:34:14 -0600 Craig Niederberger writes: > that I'm seeing noise primarily at *low* freqencies, around the >edges > of each transition. At high frequencies, the transitions are >pretty > stable. The usual method of "debounce" is to ignore transitions for a period of time after the first one (the one that is counted). The period of time used is of course limited by the maximum rate of transitions in a valid signal. If your low-frequency signals have a "noise" component below the highest frequency to be accepted, there is no way to tell them apart. Usually in a period measurement only edges of one polarity are considered. Then, variations in the duty cycle of the signal are rejected. Doing even a simple period measurement (no noise rejection) at 150 KHz on 8 inputs simultaneously seems impossible. _____________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866]