acquire a signal with two differents rates

[RavensFan]

There is an Express VI called Align and Resample.  Sample at the higher rate and use that to get the "other" rate.

[Dennis_Knutson]

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@Roro8989 wrote:

OK but I have only 1 channel and I would like to record this channel with two differents rate in the same time. I haven t multiple channel, just one.

Thank you very much

Romaric GIBERT

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Then you really should have mentioned that you were using the other 3 channels of the board for something else. The decimate function or Express VI that Ravens Fan mentioned are your options.

[NIquist]

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@Roro8989 wrote:

OK but I have only 1 channel and I would like to record this channel with two differents rate in the same time. I haven t multiple channel, just one.

Thank you very much

Romaric GIBERT

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ONE channel means ONE rate at a time.  It's like you're asking how to drive one car at two different speeds simultaneously.    Obviously , it can't be done.

[Ben]

If this wonder board allows different rates on different input channels at the same time... wire the input signal to two channels and set up a seperate acq rate for each task.

Ben

[Roro8989]

ok thank you very much everybody. I ve tried the align and resample but  I don t see any change. I would like to know how I can configure my express. For example if my high rate is equal to 20kHz and I want to resample this signal at 5kHz, What setting can i change for this? the dt ( and if it s yes what value)

thank you very much

Romaric GIBERT

[Dennis_Knutson]

Simple arithmetic. The dt for 5kHz is the reciprocal of it - 1/5000 = .0002

[Motorbreath]

I will make some suggestions if I get your problem right.

I would firstly get the dynamic data and turn into waveform and record it.

You can use the same signal resample by using "Build Waveform" by changing "dt" value.

Here is a sample.

[Ben]

"... and this amp goes all the way up to 11 !" (Spinal Tap, the movie)

Ben

[Dennis_Knutson]

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@Motorbreath wrote:

I will make some suggestions if I get your problem right.

I would firstly get the dynamic data and turn into waveform and record it.

You can use the same signal resample by using "Build Waveform" by changing "dt" value.

Here is a sample.

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Not at all the same thing. A decimate or resample will reduce the number of samples, which is what I think the op wants. Just changing the dt will not reduce the sample size.

[Roro8989]

Sorry but I don t know what is the good solution, the solution with the VI Align and Resample or the solution has given Motorbeath? thank you very much