SMPTE inter-modulation test?

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SMPTE inter-modulation test?

Postby Cupwise » Thu Mar 03, 2011 4:54 pm

what purpose is the test file with the "SMPTE inter modulation distortion test" in the latest tip of the month?
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Re: SMPTE inter-modulation test?

Postby enriquesilveti » Sun Mar 06, 2011 9:27 pm

No specific purpose, just show how SMPTE recommend to do it. (http://books.google.es/books?id=d7ft6F8 ... &q&f=false). I prefer the simple method from Simulanalog (http://www.simulanalog.org/clip.pdf)

We spend all the time talking about inter modulation distortion but we test it with simple sine tones, that is not a real situation, 2 sine tones mixed is a better example, very easy to see if you use the 1 kHz + 1.2 kHz example.

Important note: by definition if the DUT (device under test) is not lineal apply 1 kHz through the DUT and 1.2 kHz through the DUT and then sum will not the same than sum both signal before and then apply it through the DUT.
Enrique Silveti.
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