RD30 Quad multibit d/a converter - Page 4 - diyAudio
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Musicaltech Musicaltech specialize in top digital audio concepts using powerful programmable logic devices. Original designs include total replacement of off-the-shelf chips - seen by the Musicaltech team as a limitation in performance and flexibility. Information about one of the the most sophisticated dacs avaialable for DIYers, either multibit or delta-sigma, are available in the dedicated forum.

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Old 7th November 2012, 05:10 PM   #31
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Join Date: Feb 2002
Location: Toronto, Canada
Quote:
Originally Posted by Lupulroz View Post
I already have an apodizing filter available. I can supply the dac with it, instead of linear phase. Another option - which sound best of all to my ears - is a convolution FFT type, which is impulse response optimized - somewhat a combination between minimum phase and linear.
I like the choice of the filters. This way one can avoid pre-ringing of the linear filter.

How is the USB done and is the USB part isolated from the rest of the DAC?

Can you PM me the prices?

Thanks,

Tony
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Old 8th November 2012, 10:32 AM   #32
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Join Date: Apr 2003
Location: Mars
Quote:
Originally Posted by Tonyb View Post
I like the choice of the filters. This way one can avoid pre-ringing of the linear filter.

How is the USB done and is the USB part isolated from the rest of the DAC?

Can you PM me the prices?

Thanks,

Tony
The USB makes use of a Cypress hi-speed interface which outputs paralell data. Then data is serialized internally into the fpga after a fixed clock. The usb isolation is appealing to some degree but right now means also bandwidth limiting, so we decided not to use it - and frankly I don't miss it in this design; the sound on usb input is just stunning.
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Old 10th November 2012, 10:14 PM   #33
Magsy is offline Magsy  United Kingdom
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Join Date: Jan 2005
Location: Wales
This looks like something I've been after for a few years, a good way to find out if the pcm1704 is what people say it is!

How do we swap filters / update the software? I understand it is probably not easy to expose all this via USB to the PC but is there another way in? an interface for us to remotely update and swap filters (provided by you)?

Thanks
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Old 12th November 2012, 04:01 PM   #34
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Join Date: Apr 2003
Location: Mars
Quote:
Originally Posted by Magsy View Post
This looks like something I've been after for a few years, a good way to find out if the pcm1704 is what people say it is!

How do we swap filters / update the software? I understand it is probably not easy to expose all this via USB to the PC but is there another way in? an interface for us to remotely update and swap filters (provided by you)?

Thanks
The filters are simply switched with the remote using the dedicated menu entry.
You can switch between 2 types for now - you can specify me the type of filter(s) wanted.
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Last edited by Lupulroz; 12th November 2012 at 04:11 PM.
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Old 3rd April 2013, 08:43 AM   #35
omainik is offline omainik  Austria
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Join Date: Jul 2005
Location: vienna
Hi Lupulroz,

could you give a little bit more detail on the topology of the I/V board?

please send me a price for DAC and I/V module.

regards,
Peter
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Old 25th March 2014, 01:42 PM   #36
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does this producer reply PMs, mails and so on? No feedback at all.
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Old 25th March 2014, 01:54 PM   #37
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Quote:
Originally Posted by Charcoal View Post
does this producer reply PMs, mails and so on? No feedback at all.
Sorry for my delay, I was away for some time. You have PM.
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