Home Computer Audio Asylum

Music servers and other computer based digital audio technologies.

[ Follow Ups ] [ Post Followup ] Thread: [ Display  All  Email ] [ Computer Audio Asylum ]
[ Alert Moderator ]

RE: usb to spdif with BNC-Go

"Not much logic or analogue circuits out there that come even close to 0.3nS rise time. Good work. Does that include 1m SPDIF Cable and is measured at the far end"

Of course, 4 feet actually. It is terminated inside the scope with 75 ohms. The Scope 75 ohm internal terminator cost me $1200.00 alone. I don't even use a probe. This is the ONLY way to accurately measure S/PDIF IMO. Otherwise you are missing a lot. With other measurement setups and B/W limitations, you can only make frequency measurements or qualitative observations, and those are limited. You cannot measure rise-time, fall-time, overshoot, undershoot, edge monotonicity etc...

"Plus, with such a rise-time you are of course maximizing the problems from any impedance discontinuity in the connection (even from a 75 Ohm BNC) and you potentially create a lot of problems for getting FCC or other EMC approvals."

Its the price you must pay if you want to achieve the lowest jitter.

"I think you can easily step to a slower edge rate without causing common SPDIF receivers any trouble, of course you loose bragging rights."

Its not about causing "trouble", its about achieving the lowest jitter from the receiver. And the receiver you use matters a LOT. I believe I don't brag about my risetimes anywhere in my literature.

Steve N.

This post is made possible by the generous support of people like you and our sponsors:
  Atma-Sphere Music Systems, Inc.  

Follow Ups Full Thread
Follow Ups
FAQ

Post a Message!

 Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Subject:
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2025, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]