Optical vs Coaxial output - Page 2 - 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 9th February 2004, 12:23 PM   #11
krishu is offline krishu  Europe
diyAudio Member
 
krishu's Avatar
 
Join Date: Apr 2003
Location: .
Hi Giorgio,

please dont care about me, it is fine when you answer those questions maybe in form of a TNT-audio article later on. I am looking forward to reading it.

Good luck for you whatever your problems are.

Cheers
Christian.
__________________
Visit my DIY page at www.krishu.de
  Reply With Quote
Old 10th February 2004, 05:11 PM   #12
diyAudio Member
 
Join Date: Dec 2003
Location: Orange County, CA
Default Output

The optical transmitter has an electrical input. All you have to do is find the pin on the transmitter with digital signal and tap off that. However, my own feeling is that once its in digital format, its not really important whether it goes optically or by wire.

However, if you do believe optical is inferior, then using an opto to electrical converter is silly because you still have the opto in the signal path.
__________________
Dan Fraser
  Reply With Quote
Old 10th February 2004, 07:12 PM   #13
diyAudio Member
 
Join Date: Jan 2004
Location: US
How can optical transmission be inferior? Coax transmission is susceptible to noise. Even though optical transmission is limited by distance, there is no possibility for electrical noise. I image bandwidth is limited as well, but for PCM transmission, is optical really that bad?
  Reply With Quote
Old 10th February 2004, 08:26 PM   #14
diyAudio Member
 
Join Date: Jan 2003
Location: Audubon, PA
Having recently designed an optical S/PDIF receiver for work, the one thing I can tell you is that the optical transmitter/recevier combination can distort pulse widths significantly - al least 10 to 20 ns IIRC. This is because of a significant difference between rise time and fall time of a pulse. This pulse width distortion can (depending on the clock recovery scheme used) increase jitter in the receiver.

In all other respects I would agree that an optical solution would be better, offering increased noise immunity as well as electrical isolation between transport and DAC.
__________________
Mike
"Never confuse motion with action." B. Franklin
  Reply With Quote
Old 10th February 2004, 09:15 PM   #15
diyAudio Member
 
Join Date: Jan 2004
Location: US
Ahh, I understand now. All transmission methods have their flaws and choosing the right one in a design depends on the application. My question is for using the S/PDIF output from a cd-rom drive. For transmitting the output to a CS8420, which is the best method for a maximum of 6ft cable lengths with 16 and 24 bit audio up to 96kHz?
  Reply With Quote
Old 11th February 2004, 05:53 AM   #16
diyAudio Member
 
Tube_Dude's Avatar
 
Join Date: Mar 2002
Location: Aveiro-Portugal
Hi
What compromise a litlle the optical connection is the perfomance of the electrical to light transducer...if you see the pulses with a scope in the sending end tranducer TOTX and in the receiving end TORX you will see a rouding efect in the pulses...
__________________
Jorge
  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
Jambo DAC - DIY USB/Optical/Coaxial DAC kit now available! Jambo Digital Source 8 20th August 2008 09:41 AM
Optical output to Coaxial? Tenson Digital Source 13 18th June 2008 10:53 PM
optical coaxial connection mhtplsh Solid State 1 17th May 2008 01:16 AM
optical out to coaxial wooddragon Digital Source 1 12th January 2006 07:49 PM
Optical, Coaxial, and RCA TheDriver41 Digital Source 11 24th January 2005 10:38 PM


New To Site? Need Help?

All times are GMT. The time now is 02:43 AM.


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