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Hi all, hi Brett,

We finally get a better accuracy for System::getSpectrum (0,7hz) !!!
The calculation time is also acceptable for real-time interpretation :-)
Nice work.

Here is the only problem left, which may exist for other users… When studying the spectrum, we observed a 50hz noise and its harmonics.

After some reasearch, it seems to be a known noise due to AC radiation which fundamental frequency is 50Hz.

And the musical note G three octaves below middle C is 49Hz…
Does FMOD EX have a function treating this noise or not ??

Thx 4 all :-)

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Hi,
Thx for the status ^^

Well, it seems that you didn’t do any filter for that one… Filtering low frequencies or high frequencies doesn’t fit for finding musical notes… More over, 50hz noise appears with its harmonics…

Any electric source near the PC is generating this noise (220V / 50Hz in France, it may be 60Hz in other countries) corresponding to a neon light, etc… PC power supply also generates this noise, although this is not very intensive… Have a look at this <[url=http://64.233.183.104/search?q=cache:UBebyvB0ELEJ:www.science-products.com/Products/CatalogA/Filters%2BDiscriminators/HumBug/HumBug.pdf+50+hz+noise&hl=fr&client=firefox-a:9jjhq33z]Documentation[/url:9jjhq33z] > ([url=http://www.science-products.com/Products/CatalogA/Filters+Discriminators/HumBug/HumBug.pdf:9jjhq33z]pdf[/url:9jjhq33z]). This is what we discovered with FMOD :-)

++ :-)

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Hi,
sorry… I try again…

While recording with FMOD EX and analysing spectrum in real-time, we can observe the 50hz noise i’m talkin’ about.

I read on the internet that it was caused by power supplies (neon lights also…) near the sound card or whatever you record with.

I just would like to know if some filter existed for this matter in FMOD EX, but apparently not :-)

You may want to consider it or not, it doesn’t really matter… I just wanted to tell you…

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Roger that.
Thx.

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