How to design a digital switch in order to modulate an analogue carrier?

Hi,
I am struggling with something that, I think, might be simple. I am programming a digital modulator. It multiplies an analogue waveform (carrier) by 1 or -1 according with the value in the digital signal.
Thus, how to design a digital switch using a digital waveform?
I have tried to use Numeric and Boolean functions, but I am getting constant errors due to data type incompatibilities (broken wire).
Many thanks,
Dave

MInd showing us your code?
You might have to use a FOR loop to process your data.
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How to design a digital filter given roll-off in dB/Octave

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Solved!
Go to Solution.
Attachments:
Filter in DFD.PNG ‏161 KB
Filter Criteria.PNG ‏80 KB

I'm accepting your solution - and adding more information on why your filter meets the requirements.
My filter also had the additional requirement of using a sample rate of 1000Hz, so I had to change the stopband edge frequency based on that sample rate. I found that the rolloff rate corresponds directly to the order of the filter, and since for Butterworth filters, order 2 corresponds to 12dB/Octave, order 3 to 18dB/Octave, and order 4 to 24dB/Octave, any of those 3 orders of filter will fit my criteria. By adjusting the stopband freqency it's possible to change the order of the filter, so as below the stopband frequency of 327Hz gives an order 3 filter, which should be right in the middle of the acceptable range.
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Attachments:
Lowpass order 3.PNG ‏37 KB

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Having arranged some scanned pictures in an album in I-Photo how can I keep them in the order I have chosen when I move the album. They all have the scan date and not the taken date and move to new positions if I move them from one album to another.

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