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Author Topic: Natami and FPGAArcade  (Read 11200 times)

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Offline mikej

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Re: Natami and FPGAArcade
« Reply #29 from previous page: May 07, 2009, 09:40:46 AM »
I've no idea what happened to George, he just stopped writing me emails one day :(

I'm an idiot, I have the part numbers the wrong way round in the BOM. That would confuse the production people.

The correct part number is
mountain switch 102-1261-ev. Digikey EG1837-ND fits the footprint.

Best,
Mike.

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Offline FrenchShark

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Natami and FPGAArcade
« Reply #30 on: May 19, 2009, 05:14:13 PM »
Quote from: FrenchShark;452768
I have seen his website too.

Concerning the filter, the digital version of the state variable filter should be close enough.
There is a good explanation here:
http://www.earlevel.com/Digital%20Audio/StateVar.html
We certainly need some non-linearities in the feedback loop. I am thinking about using a look-up table made with a block RAM and some interpolation.

BTW, mike the part number you posted was not the slide switch next to the power connector. It is a momentary switch (for a reset button maybe ?).

Regards,

Frederic
Hello,

I have my VHDL SID working now (without the filter).
The last bug was an excessive amplitude that saturated the line driver. I just divided the output by 2.
Now, I am working on the filter. It does not seem to be too complicated.
Once I am done, I post an MP3 (any SID tune preference ?).

Regards,

Frederic
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Offline alexh

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Natami and FPGAArcade
« Reply #31 on: May 19, 2009, 07:36:20 PM »
"Do It" by Nelly Furtado produced by Timberland

(Aka "Acidjazzed Evening" remixed by Glenn Gallefoss composed by Janne Suni)
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Offline jensl

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Natami and FPGAArcade
« Reply #32 on: May 20, 2009, 11:47:46 AM »
Something from Rob Hubbard or Martin Galway (Delta or Arkanoid)

MfG

Jens
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Offline FrenchShark

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Re: Natami and FPGAArcade
« Reply #33 on: May 21, 2009, 05:40:24 AM »
Quote from: jensl;455298
Something from Rob Hubbard or Martin Galway (Delta or Arkanoid)

MfG

Jens


I just finished implementing the filter.
It sounds like it works !
Frequency goes from 30Hz to 12500Hz and Q factor from 0.707 to 1.707. There is no distortion in the feedback loop (yet).

I have tried Arkanoid and Great Giana Sisters with PSID64. They really sound great !

The C64 with the VIC-1541 only take 30% of my Cyclone III.

It is late, I will record the MP3 tomorrow.

Regards,

Frederic
« Last Edit: May 21, 2009, 05:44:49 AM by FrenchShark »
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Offline mikej

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Re: Natami and FPGAArcade
« Reply #34 on: May 21, 2009, 05:28:43 PM »
I put up some more (fuzzy) pictures of the processor daughter board.
http://www.fpgaarcade.com
/MikeJ
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Offline ferrellslTopic starter

Re: Natami and FPGAArcade
« Reply #35 on: May 21, 2009, 06:08:19 PM »
Nice!
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Offline wawrzon

Re: Natami and FPGAArcade
« Reply #36 on: May 21, 2009, 06:33:36 PM »
cool!
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