how to creat a BPF

[Naama2110]

Hi,

I have a program of analog output (sine wave at 20 kHz freq) and an analog input which samples the analog output.

I need to create a BPF after I create the sine wave. 

any help and thoughts?

thanks in advanced

[GerdW]

Hi Naama,

- what is a BPF? (Are you talking about Bandpass filters?)

- why do you convert your data to DDT wires? The DAQmx functions work better with "plain" wires like "array of DBL!"

- Why do you need a bandpass just behind the signal generation function?

- What's the point in using DAQmx IsTaskDone when you don't read its output?

- What's the problem at all? Apparently you already solved your problem!?

[Naama2110]

Hi, and thank you for your response.

What I need to do is a sine wave that need to go through Bandpass Filter- this will be my analog output and then I need to acquire this signal in my analog input channel.

the problem is when I added the filter the program doesn't work well there is an error (200284)

I have added the program. 

[JensG69]

You are loosing the timing information of your sine wave by using the Dynamic Data Type. Stick to the waveform, and you shouldn't get an error:

Regards, Jens

[Naama2110]

Jens, thank you very very very much!! you helped me a lot. 

Happy new year!

Naama

[Naama2110]

Hi Jens,

Just one more question because I am new in Labview. 

I have add the new program with your comment and I look at the filtered signal graph and it doesn't look different though the inquire data look different.

I work with the X-series USB-6341 so the sampling info is now 500kHz.

thanks in advanced,

Naama