DSP Xover project (part 2) - Page 7 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 12th July 2012, 12:49 AM   #61
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
ok master, I understand, first I must empty my bank accounts to attain the path to true happiness?

  Reply With Quote
Old 12th July 2012, 09:20 AM   #62
diyAudio Member
 
Join Date: Jan 2005
Location: Sweden
Is the product all set for production or is there still time for changes ?
If not, what's the timeframe for the final presentation ?
Will you be presenting any demosoftware for evaluation before that ?
  Reply With Quote
Old 12th July 2012, 06:58 PM   #63
chaparK is offline chaparK  Luxembourg
diyAudio Member
 
Join Date: Apr 2010
Location: Luxembourg
Dahlberg, there are still chunks of code to be written, mostly for the GUI. I'll pull out first the Windows version, then the Linux one and finally the Mac one.

I hope to make available the hardware and the Windows build in 3 months.
  Reply With Quote
Old 12th July 2012, 07:33 PM   #64
diyAudio Member
 
Join Date: Jan 2005
Location: Sweden
Great, I actually don't need another project rigth now anyway.

Is there any problem connecting two "Buffalo dac's" to the i2s
output. Read something about clocking but I'm not shure.
  Reply With Quote
Old 12th July 2012, 07:48 PM   #65
chaparK is offline chaparK  Luxembourg
diyAudio Member
 
Join Date: Apr 2010
Location: Luxembourg
Quote:
Originally Posted by dahlberg View Post
Is there any problem connecting two "Buffalo dac's" to the i2s
output. Read something about clocking but I'm not shure.
Let's start with one DAC first.
What are your requirements? I.e. enumerate the lines that you need along with their specs (rate, voltage).

Now for 2 DACs, you'll have to split the signals to feed each of them. Indeed, the expansion ports will have only 1 LRCK line and 1 bit clock line. So if your DACs come on 2 separate boards, then you need to feed the signals above to each of the boards.

Also, in order to have the main board operating, you'll need first to provide:
- a power supply (5V and +/- 12V)
- a back-lit LCD display - any color any size provided it's the proper type (2x16)
- 8 push-buttons
- a IR sensor (5V 38kHz) if you intend to use a remote controller, which I recommend.
  Reply With Quote
Old 12th July 2012, 10:23 PM   #66
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
so there is only multiple Sample Data pins present ie. Sdata 1, Sdata2, Sdata3 etc., but BCK, LRCK only 1 each? I will be using 2 or more dac physical boards too, guess i'll have to figure out some sort of buffer. possibly 2 dacs that are close will be ok. do you think you could just put 2 of each ouput in parallel? pretty easy with the u.fl headers
  Reply With Quote
Old 13th July 2012, 01:36 AM   #67
chaparK is offline chaparK  Luxembourg
diyAudio Member
 
Join Date: Apr 2010
Location: Luxembourg
Quote:
Originally Posted by qusp View Post
so there is only multiple Sample Data pins present ie. Sdata 1, Sdata2, Sdata3 etc., but BCK, LRCK only 1 each?
That's correct.
Quote:
I will be using 2 or more dac physical boards too, guess i'll have to figure out some sort of buffer. possibly 2 dacs that are close will be ok. do you think you could just put 2 of each ouput in parallel? pretty easy with the u.fl headers
I don't think it's going to be a problem for LRCK and BCK to drive 2 gates in parallel, but I'd suggest to make a clean wiring.
  Reply With Quote
Old 13th July 2012, 05:43 AM   #68
diyAudio Member
 
Join Date: Jun 2009
Quote:
Originally Posted by chaparK View Post

At the electronic level there's no fifo at all on the signal path. When the sample is available, it gets transferred straight away to the CPUs for processing and it can be spit out on the next sample clock edge.
so I take it that you are running the core at one interrupt per sample ? You are not using block dma mode ?
  Reply With Quote
Old 13th July 2012, 02:34 PM   #69
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
Quote:
Originally Posted by chaparK View Post
That's correct.

I don't think it's going to be a problem for LRCK and BCK to drive 2 gates in parallel, but I'd suggest to make a clean wiring.
which is what u.fl is all about.

I would suggest you please put 2 x u.fl for each BCK and LRCK like below. patterns are drawn to scale as well as a 1:10 scale and possible suggestions for compact arrangement of 2 in parallel opposed to each other. the small pad is signal, the outer 2 bars are ground. you should just be able to import them, if you need a DXF or something let me know
Attached Files
File Type: zip u.fl pattern variations 3.pdf.zip (189.4 KB, 85 views)
  Reply With Quote
Old 13th July 2012, 02:45 PM   #70
diyAudio Member
 
s3tup's Avatar
 
Join Date: Dec 2004
Location: Israel
And if you put 2 ufls on single output, put two series resistors, and keep the lengths of ufl cables equal (load 'em equally).
This is "Y" transmission line configuration. If you won't care to load everything equally, you'll need to go "bus" termination with a resistor on parallel to transmitter or thevelyn biased termination. These aren't nice on the driver's use.
__________________
The missing link between lead and gold in alchemist's world was BS and commerce.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
DSP Xover project chaparK Digital Line Level 141 3rd July 2011 10:16 AM
Help Please for simple active Xover project dcathro Analog Line Level 4 9th September 2010 05:47 AM
Violet DSP Evolution - an Open Baffle Project cuibono Multi-Way 211 18th May 2010 02:26 AM
Software digital DSP ... Xover/filters/EQ ?? JinMTVT Digital Source 2 8th October 2004 06:02 AM
DSP card & proper xover for heathkit 859A speaker cabinet x. onasis Multi-Way 6 22nd April 2003 07:39 PM


New To Site? Need Help?

All times are GMT. The time now is 04:32 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2