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Old 14th November 2003, 11:54 PM   #1
Rarkov is offline Rarkov  England
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Default Digital FR Measurements

Hi,
I am finally doing my dissetation for Uni. The subject is the measurement of frequency response from a standalone unit. It is limited to audio circuits and after calculating the FR it sends the results as a standard text file via RS232 to hyperterminal in the format:

frequency value

Anyway - up until today, I've been looking at strictly analogue methods:

PIC->VCO->Device Under Test->RMS2DC->ADC->PIC->RS232

but someone mentioned that I could use an impulse and convert the output from the device using FFT to retrieve the FR. Apparently this is a DSP trick called Dirac or something. Anyway - I'm looking at using the dsPIC range of products.

Can anyone give me any information about a digital method of FR measurement (NOT COMPUTERS PLZ!!!)

Thanks,
Gaz
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Old 14th November 2003, 11:59 PM   #2
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use some signal like this instead of sine? http://www.ph.ed.ac.uk/~jonathan/thesis/node82.html
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