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Old 19th March 2014, 07:59 AM   #21
ChrisPa is offline ChrisPa  United Kingdom
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Keep going

We're watching with interest
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Old 19th March 2014, 07:59 PM   #22
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Well...
I was racking my brain last night how I'm gonna split the signal and deal with signal routing, while I can still have lots of processing power and signal flexibility.
And that when it hit me...
Why not just add another DSP and run a pyramid configuration!!!
Click the image to open in full size.
DSP1 will handle ALL signal Input, Routing and ASRC functions.
DSP2 and3 will only handle signal processing and routing across DSP2- DSP3 for a flexible matrix. At this point I'm might even consider removing DAC's to a separate board, but that's still up in the air and it's highly unlikely as I would want to keep it as a complete package, At a later date I might make a DSP Trio only board for those that might want one that they can use with any DAC they might have in mind
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Old 19th March 2014, 08:31 PM   #23
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Quote:
Originally Posted by ChrisPa View Post
Keep going

We're watching with interest
I'm going the way of the dodo LOL

The thread had lots of views, so I'm sure there is some interest over this, which is not my main concern.

My take on this is simple...
The DSP's and the DAC's are freebies from Analog as samples which is available to everyone.
Both DSP and DAC chips offer you multiple cconfigurations:
DSP
- ADAU1442
- ADAU1445
- ADAU1446

DAC
- ADAU1966
- ADAU1966A


I think almost everyone can take advantage of this build a nice setup even multi way / multi channel is possible !

Board is going to be a 4 layer with gold plated pads and black silk screen the part and port designators are going to be white lettering. Beside the 1.8V core supply all power sources are going to be off board with separate power feeds the analog and digital sections. The output section on my own unit will be loosely based on the IVY as I have mentioned earlier but in a multi channel configuration as well as simultaneous balanced and single ended outputs.

Some may argue this seems a bit bloated but i will argue it until the bitter end as future proof with unlimited expansion possibilities!

BTW...
DS2 and DSP3 has a unused serial data out that will be pulled to the edge of the board that can later be routed to a Post DSP output which again if you dont want to use the on board DAC's you can route to your own.
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Old 19th March 2014, 10:58 PM   #24
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Slave Addressing will be as follows:

DAC1 - 0x04 ( ADDR1 - 0, ADDR0 - 0)

DAC2 - 0x24 ( ADDR1 - 0, ADDR0 - 1)

DSP1 - 0x70 ( ADDR1 - 0, ADDR0 - 0, Read/Write - 0)

DSP2 - 0x72 ( ADDR1 - 0, ADDR0 - 0, Read/Write - 1)

DSP3 - 0x74 ( ADDR1 - 1, ADDR0 - 0, Read/Write - 0)
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Old 19th March 2014, 11:58 PM   #25
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Talking Respect...!

Hi Adrian,

Wow...Great project!
Loads of potential and flexibility.

May I just add my own wish list...Please?!
I am building a series of active on wall loudspeakers and I am looking for a very high quality digital solution.
One board or split over modular mother / daughter boards with the following features:

(1) Fully balanced DAC with DSP ability ie Crossover and Eq
(2) Ideal if it has switchable or easily configurable mono or stereo option.
(3) Option of Power supplies ie external battery or on board or daughter board.
(4) Well implemented remote digital volume control.
(5) Small physical size...Happy with full surface mount.
(6) Good selection of digital inputs with option of digital outs as well ( I see you have this already...)

I suspect you already have all these bases covered but I just wanted to check!

Thanks for all your time and effort.
Cheers
Derek.
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Old 20th March 2014, 03:36 AM   #26
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Hi Derek,

The whole build is modular...
Power supply, Digital Input, Main Board, Digital Output, Analog Output Section are all broken up on separate boards so the end user can "build" it to their needs.
You can power the board as you wish and used any combination of inputs and outputs as you wish and that's why I'm making it so flexible. I'm trying to squeeze as much stuff as i can on the main board, but then again 3 DSP's and 2 DAC's on a Single 4" x 5.5" board.

Using a Balanced output DAC instead of a Single Ended unit makes life easier for those that want balanced signals plus a few other key points that make it so attractive...
- Its easier to dowmix a balanced signal than it is to take a single ended output and try and turn it into Balanced as amplifying a weak or distorted signal will give you just that.
- Balanced signals are less susceptible to noise than single ended as the driving voltages are higher.

Volume control will be implemented via a local rotary encoder and IR as well as i will have a expansion port for extenders ( remote of choice is going to be the so ever so popular aluminum apple one ).
The ADAU1966 has a separate volume control registers for each output channel!
Between the 2 DAC's that's 32 individual channels that volume can be set as well as master volume control. Also the steps are pretty fine at 0.375db.
Also it has soft mute feature as well
Take a look at the Datasheets I have posted earlier.


The micro-controller will be off board and its really your choice what you want to use.
Myself...
For starters I'm going to use a 5" TFT with touch function over a LCD Shield for now as in its "prototype" stage. Later on I will be making my own board and the SAM3X8E processor will be on the same board as the display and all of the controls will be on this board. The LCD controller I have in mind is a RAiO RA8875
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Old 20th March 2014, 07:40 PM   #27
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Well... another change

Originally the audio output from the DAC was going to be 32x 3 pin XHP plugs.
However, having a friend that is an EE, he suggested a slightly different and "different" route using 3M 1700 Series Flat Twisted Pair Ribbon Cable.
My only concern with this is cross talk, but then again the pins are just as close and un-insulated. Full scale differential output of the ADAU1966 is rated at 3V RMS or 8.5V peak to peak, so I don't think noise is going to be an issue.

Also, I'm still debating the power supply as SMPS or Standard one... maybe both.
Lambda makes a off the shelf regulated unit 5V dc/7A 3.3V dc/10A but its an SMPS.
At the same time, I can use SMPS for the digital section and use a separate dedicated analog supply for the DAC feed and output stage.

Decisions, decisions...
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Old 21st March 2014, 02:59 AM   #28
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Well, today I did some shopping...
5x IR receivers
10x Rotary Encoders ( push function for mute )
100x XH-3P Connector Kits ( Pin Header + Terminal + Housing 3 pin )
100x KF2510-4P Connector Kits ( Pin Header + Terminal + Housing (Right-Angle))
60" Flat Ribbon Cable - 40 conductor ( 20 twisted pairs ) 28Ga
1x TDK Lambda power supply ( 5V 7A, 3.3V 10A )

All that for under $125
Thank you eBay LOL
1x 7" TFT Display with Capacitive touch, 800x480, 64MBit Flash, supports 8080, 6800, 8-bit,16-bit parallel,3-wire,4-wire,I2C, Serial or SPI Interfaces.
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Old 21st March 2014, 03:34 AM   #29
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Quote:
Originally Posted by Adrculda View Post
Well, today I did some shopping...
5x IR receivers
10x Rotary Encoders ( push function for mute )
100x XH-3P Connector Kits ( Pin Header + Terminal + Housing 3 pin )
100x KF2510-4P Connector Kits ( Pin Header + Terminal + Housing (Right-Angle))
60" Flat Ribbon Cable - 40 conductor ( 20 twisted pairs ) 28Ga
1x TDK Lambda power supply ( 5V 7A, 3.3V 10A )
1x 7" TFT Display with Capacitive touch, 800x480, 64MBit Flash, supports 8080, 6800, 8-bit,16-bit parallel,3-wire,4-wire,I2C, Serial or SPI Interfaces.

All that for under $125
Thank you eBay LOL
Fixed it...
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Old 21st March 2014, 06:00 PM   #30
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I started some of the code last night...
The it will be based on the JOS and Hifiduino ported over to the DUE.

I have to say im a bit rusty at coding.
When i compiled i get A LOT of errors but slowly working my way down.
I'm in the process of generating the filed for the DSP and DAC controls in Sigma Studio.
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