Hi, This is Sunny,
I now realized that it's necessary to limit the bandwidth of the input signal before sending it to the DAC(to avoid Gibbs Phenomenon). But I am not sure how to add this filter. I thougt about it and also looked at the possible toolkits when developing host VI, there are several ways to use the filters:
1. Labview itself has own express filter
2. Modulation toolkit has a module called generate filter coefficient, in which the user can specify the window type.
3. Another toolkit called digital filter design seems working
So which one shall I use?
Thanks for help!