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Old October 9th 14, 07:34 PM posted to rec.radio.amateur.homebrew
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Posts: 613
Default Frequency accuracy in older RXs

rickman wrote in :

What circuit clips a
tone into a square wave just so it could be run through a low pass filter?


Sound synthesis pitch following tone generator. Ramp generator based on
natural pitch input (to get triangle wave). Preconditioner for faster capture
in 4046 PLL to use the input that would otherwise be too sensitive to errors
caused by irregular pulse width ratios... I suspect there are several cases
for this.
 
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