Thanks Ian,
This is excellent news. I will get in line and wait. Do you have a rough time line for availability? Hoping that the pricing will be reasonable and accessible too.
Currently i am going to be using the below project with miniDSP USBstreamer followed by a glavanic isolator board and the isolated MC I2S being fed to the ESS9018 operating in asynchronous mode with a 100MHz clock.
http://www.diyaudio.com/forums/grou...kbird-multi-channel-es9018-dac-group-buy.html
In future, i want to replace the USBstreamer+isolator with, this multichannel USB to I2S board XMOS Multichannel high-quality USB to/from I2S/DSD SPDIF PCB - DIYINHK followed by your multi-channel I2S FIFO and put the ESS9018 board in synchronous mode. It has an u.fl connector to accept external clock in this mode.
Please take a look and advice if this is a feasible application.
This is excellent news. I will get in line and wait. Do you have a rough time line for availability? Hoping that the pricing will be reasonable and accessible too.
Currently i am going to be using the below project with miniDSP USBstreamer followed by a glavanic isolator board and the isolated MC I2S being fed to the ESS9018 operating in asynchronous mode with a 100MHz clock.
http://www.diyaudio.com/forums/grou...kbird-multi-channel-es9018-dac-group-buy.html
In future, i want to replace the USBstreamer+isolator with, this multichannel USB to I2S board XMOS Multichannel high-quality USB to/from I2S/DSD SPDIF PCB - DIYINHK followed by your multi-channel I2S FIFO and put the ESS9018 board in synchronous mode. It has an u.fl connector to accept external clock in this mode.
Please take a look and advice if this is a feasible application.
That sounds so great!
The prototype PCB is running. Pre-production PCB is on order.
But multi-channel applications are bit more complicated than stereo. Just wondering how many people are interested in it so that I can make a decision to run a production.
Good luck to your project,
Ian
I am definitely in.
This product makes a lot of sense and would continue to do so going forward, with abundant DSP based active speaker projects picking up.
It sounds like re-mapping function. Can you give me some more details about this requirement?
Regards,
Ian
Oh dear I have so much PS, wires, no box and EMC everywhe than I can catch russian satelites with my 16 bits dac, so I prefer not too much talk about my last setups.... BtW the more I become deaf the more I like the colored sound.... but I like to hear the wood reed of Ben Webster in his metal saxo as well, so I'm fan of the quiet and jitter free front end designs... I would like to feed my dac with such modern regs or discrete low noise regs which are even quiter if I understood than the TS7A with LiPoFe battery for motorcycles which costnothing today and have not the explosive risky behavior ! I have always a Mosfet class A amp for the first few watts with a smps PS for the other 250W/8 ohms if needed. No DSP yet, nore Hypex for the moment !
I'm working to setup an AD1862 DAC with colored tweaks as well.
I'm working to setup an AD1862 DAC with colored tweaks as well.
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Ah Ian, sorry if stupid question, you know Technical and I make two 
!
Is this concept feasible, if yes technicaly possible ?
Adding bits to the enter 16 to 24 bits to apply digital volume without the genuine signal truncation then sosutracting it at the outputt while having still the attenuation ? Or do we still need this extra bits information till the dac chip (so if this case the dac chip being 32 bits as the modern ESS or AK dac chips and not our old PCMs dac chips) ?
!Is this concept feasible, if yes technicaly possible ?
Adding bits to the enter 16 to 24 bits to apply digital volume without the genuine signal truncation then sosutracting it at the outputt while having still the attenuation ? Or do we still need this extra bits information till the dac chip (so if this case the dac chip being 32 bits as the modern ESS or AK dac chips and not our old PCMs dac chips) ?
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Hi Ian,
Did you have a chance ro look into this one / the botic drivers and the intwgration of the BBB with our eqipment ?
TDM ADAT multi channel demux
After sleeping over the idea I think some kind of demux board would be necessary. Here is the idea.
This hackaday project https://hackaday.io/project/9634-linux-based-low-latency-multichannel-audio-system extends Beaglebone sound drivers to support 8 channels TDM multiplexed output. Here is some more info on the TDM format https://e2e.ti.com/support/arm/sitara_arm/f/791/t/307825 See last comment. It would not take long for other SBCs to support TDM output. XMOS chip has I2S_MODE_TDM support as well.
Now the idea is to use ac3/dts decoder on BBB to decode ac3/dts to 6 PCM channels, then send them TDM-multiplexed to FIFO and then have them demuxed by a demux board to separate I2S channels. Another use case is a multi room application having 4 stereo channels from BBB or xmos USB->TDM board.
I2S outputs from demux board can be used to connect to BIII, or even multiple I2S2PCM boards to drive legacy stereo DACs.
Another use case could be to demux ADAT Lightpipe 8 channels optical input to I2S outputs. This requires an update to SPDIF board or a separate TOSLINK board with ADAT Lightpipe support.
After sleeping over the idea I think some kind of demux board would be necessary. Here is the idea.
This hackaday project https://hackaday.io/project/9634-linux-based-low-latency-multichannel-audio-system extends Beaglebone sound drivers to support 8 channels TDM multiplexed output. Here is some more info on the TDM format https://e2e.ti.com/support/arm/sitara_arm/f/791/t/307825 See last comment. It would not take long for other SBCs to support TDM output. XMOS chip has I2S_MODE_TDM support as well.
Now the idea is to use ac3/dts decoder on BBB to decode ac3/dts to 6 PCM channels, then send them TDM-multiplexed to FIFO and then have them demuxed by a demux board to separate I2S channels. Another use case is a multi room application having 4 stereo channels from BBB or xmos USB->TDM board.
I2S outputs from demux board can be used to connect to BIII, or even multiple I2S2PCM boards to drive legacy stereo DACs.
Another use case could be to demux ADAT Lightpipe 8 channels optical input to I2S outputs. This requires an update to SPDIF board or a separate TOSLINK board with ADAT Lightpipe support.
Hi Blitz,
I have a BBB, I'm willing but still can't find time to try the driver. Do you have link of the guidance? It will save me some time if you have more detailed information.
Regards,
Ian
That's interesting idea. I'll take it into consideration.
What device supports TDM now?
Regards,
Ian
Hi Crom,
That's a very good suggestion. The new I2S/DSD FIFO can detect I2S/DSD automatically. In my FPGA design, it can be very easy to re-map signals in different way for different stage.
Can you please let me know what do you want the signal mapping for both I2S and DSD mode with your 9018 mono block configuration? I'll take it into consideration.
Regards,
Ian
XMOS Multichannel high-quality USB to/from I2S/DSD SPDIF PCB - DIYINHK
"Maximum 32 channels can be supported if the user flash the XMOS with TDM I2S capable firmware."
https://drive.google.com/file/d/0B2goLqs_HZ3QMFV4SFNySjJzX3M/view?usp=sharing
Debian Wheezy SD card image for BeagleBone Green with TDM output support from hackaday project https://hackaday.io/project/9634-linux-based-low-latency-multichannel-audio-system
http://electronics.dantimax.dk/Kits/Digital_audio/11329401182.html
ADAT Lightpipe Boards -> select OptoRec/Gen on the left
http://madi.webklik.nl/page/madi
MADI Boards
Hi Ian,
There is plenty of guidance, but it is quiet easy to get it started as there is already a complete image with the drivers included, mpd etc for the bbb. You can find the image on Miero's webpage:
http://bbb.ieero.com/
Please let me know if you face any issues, so that we can help.
There is plenty of guidance, but it is quiet easy to get it started as there is already a complete image with the drivers included, mpd etc for the bbb. You can find the image on Miero's webpage:
http://bbb.ieero.com/
Please let me know if you face any issues, so that we can help.