Hi-end DSP based multi-channel integrated Preamp/Crossover/DAC project - diyAudio
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Old 12th November 2014, 05:24 AM  
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Lightbulb Hi-end DSP based multi-channel Preamp/Crossover/DAC project

Greetings


This is my latest DSP project based around an Analog Devices SHARC DSP and ES9018 Sabre DAC and ES9112 Sabre ADC.

Click the image to open in full size.

Preliminary specs of the main DSP board shown below. Comments and suggestions welcome.

  • ES9018 32 bit Sabre 8 channel DAC
  • ES9112 32 bit Sabre 2 channel ADC
  • DSP capability -
    • 4th Generation Analog Devices Floating Point SHARC DSP with SIMD and 2400 M-flops performance.
    • 32 bit @48,96,192KHz DSP audio processing rate
    • IIR filter hardware accelerator
    • FIR filter hardware accelerator with upto 32K taps
  • Digital Inputs -
    • 6 x S/PDIF Inputs -
      • 3 x Isolated COAX RCA Inputs
      • 1 x Isolated AES/EBU XLR Inputs
      • 2 x TOSLINK Inputs
    • 1 x Isolated I2S Input - PSAUDIO standard
    • 1 x Isolated USB Input - Asynchronous USB 2.0 using Amanero Combo 384
  • Digital Outputs -
    • 2 x S/PDIF Outputs -
      • 1 x COAX BNC Output
      • 1 x TOSLINK Output
  • Analog Stereo Line Inputs -
    • Balanced Stereo Input Channels
      • 1 x XLR
    • Unbalanced Stereo Input Channels
      • 2 x RCA
    • OR
      • 1 x RCA
      • 1 x MM Phono Input with selectable impedance and RIAA curve
  • Analog Outputs -
    • 8 Balanced XLR Outputs for 4 stereo channels
    • 8 Unbalanced RCA Outputs for 4 stereo channels
  • Bit-perfect master volume control
  • Bit-perfect level control on each individual channel
  • Home Theater Bypassing mode including multi-channel active speaker setup
  • Native DSD processing in the digital domain without conversion to analog first
  • Low jitter clock and clock distribution network
  • Digital Formats
    • Optical S/PDIF - From 32K to 192K
    • Coax S/PDIF - From 32K to 192K
    • AES/EBU - From 32K to 192K
    • USB
      • PCM - From 32K to 192K
      • DSD - 64/128/256


Analog Audio Input Board

Click the image to open in full size.


Digital Audio Input/Output Board

Click the image to open in full size.

Power Supply Board

Click the image to open in full size.

Eight Channel Un-balanced Output Board

Click the image to open in full size.

Eight Channel Balanced Output Board

Click the image to open in full size.

User Controls Board

Click the image to open in full size.

Amanero isolated USB interface board

Click the image to open in full size.

Last edited by Tranquility Bass; 5th March 2015 at 10:23 AM.
 
Old 12th November 2014, 03:27 PM  
jcga is offline jcga  France
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Hi,
this looks incredibly appealing !
Any approximate idea of the price and availability ?
 
Old 13th November 2014, 12:36 AM  
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Quote:
Originally Posted by jcga View Post
Hi,
this looks incredibly appealing !
Any approximate idea of the price and availability ?
It depends on how much interest there is as this board has to built in quantities and can't be built by hand except for one off prototypes but don't expect minidsp prices !!

There are eight other support boards some of which are simple through hole boards and some are more complex surface mount boards.

I will post some of the other boards when I have completed them.

cheers
 
Old 13th November 2014, 01:16 AM  
amoisis is offline amoisis  Australia
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Looks interesting should go well with my wire amps in an active setup .
 
Old 13th November 2014, 01:47 AM  
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This is great but is like 10 times more DSP than most people would ever need. But, you know your target buyer better than me! Add up the need for a 5 way crossover, limiters, EQ, time correction for a surround sound system and bet there will be about 90% of the DSP cycle time left over.

Good luck with this though!
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Old 13th November 2014, 02:28 AM  
potstip is offline potstip  Turkey
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Quote:
Originally Posted by jcga View Post
Hi,
this looks incredibly appealing !
Any approximate idea of the price and availability ?
+++
 
Old 13th November 2014, 03:01 AM  
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Location: Australia
Quote:
Originally Posted by sumaudioguy View Post
This is great but is like 10 times more DSP than most people would ever need. But, you know your target buyer better than me! Add up the need for a 5 way crossover, limiters, EQ, time correction for a surround sound system and bet there will be about 90% of the DSP cycle time left over.

Good luck with this though!
But the game changes as soon as you start talking about FIR filters or linear phase filters for use in group delay correction or room correction etc. Then every clock cycle counts This is why most of the lightweight DSP's have trouble doing decent size FIR filters and usually they are limited to low sampling rates of 48KHz with not much room for any other processing, because every time the sampling rate doubles the number of taps per sample interval halves !! So at 96KHz or 192KHz all of a sudden you have run out of taps before the next interrupt and your filter can no longer be processed. Then to compound matters you may need an FIR filter for the other stereo channel or 7 channels and then you are in real trouble so you end up have having one dsp board per channel and what you thought was a cheap solution has blown out the budget !!

Even with simple IIR filters you'd be surprised at how many clock cycles are chewed up for even a medium complexity crossover filter so in this case more is better and for the extra $$ of a SHARC DSP over a Sigma DSP it is well worth it

cheers

Last edited by Tranquility Bass; 13th November 2014 at 03:07 AM.
 
Old 13th November 2014, 03:10 AM  
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Quote:
Originally Posted by amoisis View Post
Looks interesting should go well with my wire amps in an active setup .
That is one of its main applications for use in high quality active speakers. It has one S/PDIF output for use with an external DAC to drive subwoofers etc for a total of a 5-way stereo active speaker system

cheers
 
Old 13th November 2014, 05:57 AM  
tuyen is offline tuyen  Australia
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Well done on a cool design! I'd possibly be interested in a unit if the opportunity arises
 
Old 13th November 2014, 06:20 AM  
jcga is offline jcga  France
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Quote:
Originally Posted by Tranquility Bass View Post
It depends on how much interest there is as this board has to built in quantities and can't be built by hand except for one off prototypes but don't expect minidsp prices !!

There are eight other support boards some of which are simple through hole boards and some are more complex surface mount boards.

I will post some of the other boards when I have completed them.

cheers
Again, the hardware described here looks to me like the best I've seen so far but I would point that the software/firmware will be as crucial as the hardware to get the benefit(success) of it.

And to answer to someone else, pointing that the power is too much for the home use, I'm running active loudspeakers for the past 20 years or so and yes FIR filters and first room modes corrections need a lot of DSP power.

JC
 

 

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