how to send a sinusoidal signal to an AO with a fixed phase difference with aother sinusoidal signal from an AI? Thank you!

[marlon88ca]

In a While Loop, read a sinusoidal signal from an AI, extract frequency, amplitude and phase, and send a sinusoidal signal to an AO with a fixed phase difference and same frequency with the AI signal.

Thank you very much!

Marlon

[mishklyar]

    The simplest way I would do it if the system pemits (without RT, FFT, convolution etc)  :

Set AO and AI with the same clock,

Connect two of AO channels with two of AI channels.

Generate AO voltalge ( sin , and cos ) near the expected frequency,record it at AI  together  with your signal.

Multiply your data with sine and cosine data and then integrate the product.

Iterate the frequency till you get maximum integral at one of the channels.

Add the desired phase difference.

[mishklyar]

add to last message : Probably instead of iterations it may be usefull to perform  FFT at

the beginning of application. And then to use the integral as some kind of PID controller, to be locked at the phase.