Inverting data line ? - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, 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 16th May 2005, 02:03 PM   #1
diyAudio Member
 
Bernhard's Avatar
 
Join Date: Apr 2002
Location: Munich
Default Inverting data line ?

Hi,

there was a thread about using balanced TDA1541A in a way so that PSU ripple and noise will cancel.
One data line should be inverted and if the negative output is subtracted from the positive, signals add while noise and ripple cancel.

Please correct me if I am wrong.

Now how to invert the digital signal ?
Look at a COB DAC.
If just the data line is inverted instead of BPZ we get -1 LSB while +FS becomes -FS and -FS becomes +FS.

If after inversion, one is added, BPZ becomes BPZ, but +FS becomes -FS +1 LSB and -FS gets overflow and will be -FS because +FS + 1LSB is not possible .

What is better ????
  Reply With Quote
Old 16th May 2005, 03:14 PM   #2
philbyx is offline philbyx  France
diyAudio Member
 
philbyx's Avatar
 
Join Date: Mar 2004
Location: near Paris
Hello,

As we say here in France, you are discovering the sugared water
All the balanced Dac (with two dacs by channel) are fed by data for one, and /data for the other one.
There is effectively 1 bit offset, because of two's complement on the inverted channel, but it doesn't matter.

Look at this schematic in the post.
http://www.diyaudio.com/forums/showt...767#post554767
It's a ad1865, but the principle is the same

Philippe
  Reply With Quote
Old 16th May 2005, 03:30 PM   #3
diyAudio Member
 
Join Date: Oct 2001
Location: .
This topic has been flogged to death. see here
'Chibi' phase inverting mod.
  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
sonic differences between inverting/non-inverting LM4780 VS both non-inverting LM4780 jarthel Chip Amps 5 19th July 2007 12:37 PM
Bridged/Stereo, w or w/o servo, inverting 3886, inverting buffer PCB Alexander Rice Chip Amps 9 27th March 2004 06:53 PM
Reclocking data line tonitze Digital Source 5 11th July 2003 04:20 PM
Data over Power Line AND Interference jackinnj Everything Else 1 21st June 2003 12:29 PM


New To Site? Need Help?

All times are GMT. The time now is 12:20 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