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Re: [oc] 1-bit DAC Project
Hi Carl,
sounds very cool.
You can create new project in the CVS repository. I'll ask Miha, the
webmaster, if he can change your webeditor access so that you can also
create new projects on the web. Now it is up to you whether to create new
project or not.
regards,
Damjan
----- Original Message -----
From: Carl van Schaik <carl@openfuel.com>
To: <cores@opencores.org>
Sent: Monday, August 27, 2001 1:14 AM
Subject: Re: [oc] 1-bit DAC Project
> Hi All,
>
> I over this weekend wrote an experimental 1-bit DAC
> from some literature I had.
> Wired it up with a FIFO and wrote a program for the
> host PC to dump data across the PCI bus.
>
> all I do is:
> "mpg123 -s /dir/MusicFile.mp3 | dacoutput"
> dacoutput is a program that monitors the
> fifo size on the FPGA and sends data when
> necessary.
>
> All, I can is... WOW!
> I was totally amazed at the quality you can yet, all from
> about 10 lines of VHDL for the actual modulator.
> I made a simple RC filter and sent the audio to my
> speakers.
>
> I'll post the code when I workout how (under
> an "experimental" directory).... Need to make a new project?
> Code should be usable by others.
> It implements a wishbone interface (I use a bus converter,
> I wrote a MemAD bus --> wishbone bus master)
>
> No docs as yet. I'm busy this week with Thesis work
> but I'll try get to them.
>
> regards
> Carl
>
> ----- Original Message -----
> From: "Ravi Nimmagadda" <gnd_zro@yahoo.com>
> To: "Carl van Schaik" <carl@openfuel.com>
> Sent: Monday, August 27, 2001 8:15 AM
> Subject: Re: [oc] 1-bit DAC Project
>
>
> > Hi Carl,
> > Thanks a lot for your reply. Please do let me know
> > once you have additional information(specifications,
> > plan of actions etc).
> > Regards
> > Ravi
> >
> > --- Carl van Schaik <carl@openfuel.com> wrote:
> > > Ravi,
> > >
> > > I think there is a possibility for a reasonable
> > > sized project.
> > > I'll start by first writing a VERY simple test
> > > version
> > > to play with the sigma-delta modulation (encoding),
> > > but the
> > > design should ultimately contain a wishbone
> > > interface with DMA capabilities, sample/bit rate
> > > conversions, stereo, mono, volume, ?3D?... etc
> > >
> > > also, is an A/D converter possible, for sound
> > > input???
> > > (may need more external hardware)
> > >
> > > I'll test the code on my PCI card, make a simple
> > > sound card /dev/dsp type device for the host PC.
> > >
> > > help would be gladly appreciated.
> > > The various encoders can be developed
> > > along the way, allowing people to choose the
> > > encoder with complexity, speed and resource
> > > requirements
> > > for their budget.
> > > A lot of theoretical work can go into the
> > > sigma-delta encoders to optimise the efficiency,
> > > qualtily (SNR), resource requirements etc.
> > >
> > > Hopefully we can discuss the project in more
> > > depth soon, get some specifications together
> > > and some plans for action.
> > >
> > > regards
> > > Carl
> > >
> > > > Hi Carl,
> > > > What would be the size of the DAC project? If it
> > > > involves multiple designers I would like to work
> > > on
> > > > the project. I have been working as an ASIC
> > > designer
> > > > for the past three and half years primarly on
> > > chips
> > > > for networking systems/devices. Please let me know
> > > > your thoughts.
> > > > Regards
> > > > Ravi
> > > > --- Carl van Schaik <carl@openfuel.com> wrote:
> > > > > Hi
> > > > >
> > > > > Talking about new projects, I am keen on
> > > > > implementing
> > > > > a 1-bit DAC, that is produce sound output
> > > directly
> > > > > from an FPGA. It's an interresting project
> > > because
> > > > > of the scope for optimisations and algorthyms. A
> > > > > good
> > > > > 1-bit DAC is quite difficult to design.
> > > > >
> > > > > regards
> > > > > Carl van Schaik
> > > > > --
> > > > > OpenFuel Pty Ltd.
> > > > >
> > > >
> > > >
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