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Dear John Smith,
I do not know the free programs and I think it are not present.
The processing of a signal must be carried out by the
microprocessor. Proton frequency are measured by counter of quartz
pulses for each period by transitions of a signal through zero.
The duration of periods summarize definitely way. I know unique
(sole) not Russian article where this idea is stated. It is
"Farrel E.J., Grosch C.B. Determination of period from times of
zeros // Proceedings of IEEE, 1965, V.12, N12, p. 2162-2163". May
be it be useful for you. I shall be grateful for the information
if you or anyone will find others article and send me.
Best regards
Vladimir Sapunov
Hi Vladimir,
I think I have seen some work on filtering from zero crossing ,
perhaps I will look for it somewhere on my hardrive !
I am not a spokesman for this group by the way, just an occasional
visitor, - Dale, Jim , Phil ,Kieth and others are the persons here
who have actually got their PPMs working .
I have boiled the water, wound my toroid, and put it on the shelf
until I have some time to experiment more !
It is summer here and the fishing takes first place !
I have some ideas of using instrumentation op- amp differential
inputs ( Analog and Texas Instruments have some nice chips for this
) and some analog filtering ( the precession frequency here at the
southern tip of Africa is about 1.2 Khz ! )
Dont worry about your English by the way, we can work out what you
mean and I am sure it is 500% better than any of our Russian !
John Smith
-----------------------------------------------------
Cavalier Electronics
L'Agulhas
South Africa
I do not know the free programs and I think it are not present.
The processing of a signal must be carried out by the
microprocessor. Proton frequency are measured by counter of quartz
pulses for each period by transitions of a signal through zero.
The duration of periods summarize definitely way. I know unique
(sole) not Russian article where this idea is stated. It is
"Farrel E.J., Grosch C.B. Determination of period from times of
zeros // Proceedings of IEEE, 1965, V.12, N12, p. 2162-2163". May
be it be useful for you. I shall be grateful for the information
if you or anyone will find others article and send me.
Best regards
Vladimir Sapunov
Hi Vladimir,
I think I have seen some work on filtering from zero crossing ,
perhaps I will look for it somewhere on my hardrive !
I am not a spokesman for this group by the way, just an occasional
visitor, - Dale, Jim , Phil ,Kieth and others are the persons here
who have actually got their PPMs working .
I have boiled the water, wound my toroid, and put it on the shelf
until I have some time to experiment more !
It is summer here and the fishing takes first place !
I have some ideas of using instrumentation op- amp differential
inputs ( Analog and Texas Instruments have some nice chips for this
) and some analog filtering ( the precession frequency here at the
southern tip of Africa is about 1.2 Khz ! )
Dont worry about your English by the way, we can work out what you
mean and I am sure it is 500% better than any of our Russian !
John Smith
-----------------------------------------------------
Cavalier Electronics
L'Agulhas
South Africa