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# Problems with multiply - AD1940 on SigmaStudio

I'm using two sources, one DC with 28.0 and a sine tone, then multiplying it and using the real time display (in 28.0 format) to see the result. The negative numbers are represented as the maximum positive value.

What am I doing wrong?

Also, when adding 1 to the sine, and multiplying this signal by a small integer number (20-100), the result doesn't seem like a sine at all. I'm trying to modelate a delay for effects like Flanger, since the Controlled Delay takes only integer delays, I'd like to know how I can do it?

I'm starting with the SigmaDSP and I'm a little (very, actually) confused since I'm used to "usual" DSPs and programming with lines...

Sorry for bad english, not a default speaker.

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•      Hello GustavoKF,

The Real-Time Display only works at very low frequency (from DC to about 10 Hz).  It's limited by the speed of the USB talking back to the PC and SigmaStudio.  To see audio frequency waveforms you'll need to use something else.  You'll find some ways to do it here:

http://ez.analog.com/message/114296#11429

As a quick test, reduce the frequency of your sine wave to 2 Hz, and see how the Real-Time Display looks then.

Likely there's nothing wrong with the way you're using the DC source and multiplier.  You'll know for sure once you set up a better viewing method.

Best regards,

Bob

•      Hello GustavoKF,

The Real-Time Display only works at very low frequency (from DC to about 10 Hz).  It's limited by the speed of the USB talking back to the PC and SigmaStudio.  To see audio frequency waveforms you'll need to use something else.  You'll find some ways to do it here:

http://ez.analog.com/message/114296#11429

As a quick test, reduce the frequency of your sine wave to 2 Hz, and see how the Real-Time Display looks then.

Likely there's nothing wrong with the way you're using the DC source and multiplier.  You'll know for sure once you set up a better viewing method.

Best regards,

Bob

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