Hi-end DSP based multi-channel integrated Preamp/Crossover/DAC project

[Tranquility Bass]

Originally Posted by soekris

What about those other 8 boards you were talking about ?? My R-2R board can take a balanced LVDS clock directly into the FPGA, so clock quality should not be a problem....

On the other hand, I'm mostly interested in additional DSP power, good software and an user interface, so I could then easily make a board with the same DSP, and then modular DAC and ADC modules :-) Assuming you're interested in sharing DSP code, on DIY or commercial basis....

Btw, what are you planning for there, commercial project, open source or combinations ?
Are you planning for actual production, assuming enough interest ?

This project is not open source. For a start I have had to sign an NDA with ESSTech so that precludes publishing the circuit. Secondly this design is based on an existing DSP design which is not in the public domain. A lot of the code I am reusing from another project which is not public domain.

Analog Devices tools are not free and nor is the ICE although the newer tools have come down in price somewhat.

I can provide TTL compatible I2S signals. Do you need a master clock ? Having said that the existing design is based around an ES9018 DAC and ES9112 ADC with 8 channels balanced/unbalanced output.

regards

[dahlberg]

I have a "Najda" with separate dac's today that I'm very pleased
with, but this might be interesting if the update (?) in dsp
recourses would take it even further.

Actually posted a thread some time ago asking for a dsp using what's at
the edge of technology today. Is this it ?


My dsp, you could probably tell from the picure what the dac's are (I'm keeping them by the way).

[dviswa]

Hello Tranquility Bass,
This is what I have been looking for, for quite sometime. I have an active setup based on minidsp. I would love to replace that with a better DAC. I will be following this thread closely.

[ejaouen]

I am interested if I can have it without the ESS ADC (I mean bought unpopulated) and price not to expensive : I only need one optical digital stereo in . good choice on the adsp214xx . very interested in your lineup of hardware dsp boards .

[Tranquility Bass]

Originally Posted by dahlberg

I have a "Najda" with separate dac's today that I'm very pleased
with, but this might be interesting if the update (?) in dsp
recourses would take it even further.

Nice work

Is that a solid copper or copper plated chassis ?

cheers

[Tranquility Bass]

Originally Posted by dviswa

Hello Tranquility Bass,
This is what I have been looking for, for quite sometime. I have an active setup based on minidsp. I would love to replace that with a better DAC. I will be following this thread closely.

It should be the perfect upgrade to what you have now

cheers
david

[Tranquility Bass]

Originally Posted by ejaouen

I am interested if I can have it without the ESS ADC (I mean bought unpopulated) and price not to expensive : I only need one optical digital stereo in . good choice on the adsp214xx . very interested in your lineup of hardware dsp boards .

You will only need the Digital Audio IO board and not the Analog Input board which would offer the most cost savings rather than manufacturing another run of the boards without the ADC.

cheers
david

[dahlberg]

Originally Posted by Tranquility Bass

Nice work

Is that a solid copper or copper plated chassis ?

cheers

It's solid .
Could you give us a description of the digital side of your project ?
Why you have chosen this particular dsp and how well it stands up
to other dsp chips. Connection over i2s seems to be possible. How
many channels, four or five ?

[Tranquility Bass]

This particular DSP is configured to use four I2S channels to drive the 8 channel SABRE DAC. It is possible to route these signals off board but I chose to do everything on board in one compact board layout. Having said that I have located all of the asynchronous digital IO on another dedicated board. These consist of S/PDIF coax and optical inputs as well as an AES/EBU input and S/PDIF output.

The reason why I have chosen this DSP over others is that it is designed for audio applications and contains a number of useful audio related peripherals which minimizes the chip count.

regards
david

[Tytte71]

This is a truly interesting Project.

Will it be possible to use more than one DSP system, e.g. one master controller and the others as slaves?

Can you please describe how the "Bit-perfect level control on each individual channel"this is implemented its gain range?

I suppose you will show measurements of the system when you're ready