CS8415A and DF1704 de-emphasis - 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 18th March 2005, 06:05 PM   #1
diyAudio Member
 
hagtech's Avatar
 
Join Date: Mar 2002
Location: Hawaii
Default CS8415A and DF1704 de-emphasis

Trying to figure out the polarity of the emphasis / de-emphasis signals on these chips. Does anyone know?

The CS8415A receiver puts out a /EMPH signal, active low. The DF1704 inputs a DEM signal, active high. I'm confused on polarity. One is emph, the other de-emph, which technically are opposite? Can I connect pins directly or need inverter in between?

Thanks!

jh
  Reply With Quote
Old 19th March 2005, 04:20 AM   #2
diyAudio Member
 
Join Date: May 2003
Location: Colorado
You'll need to use an inverter.

Edit -- Geez, I just noticed that the question was posted by Jim Hagerman. I've got enough respect for you and your great website that I'll spend a bit more time to flesh out the answer!

The pre-emphasis can only be applied at the record end of the chain. The discrepancy in nomenclature occurs because the Crystal receiver is detecting the presence of pre-emphasis, while the Burr-Brown digital filter is applying de-emphasis.
  Reply With Quote
Old 19th March 2005, 09:13 PM   #3
diyAudio Member
 
hagtech's Avatar
 
Join Date: Mar 2002
Location: Hawaii
Thanks! Appreciate the clarification.

jh
  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
De-emphasis jwb Digital Line Level 26 8th January 2009 07:38 AM
de-emphasis...??? Lyra Digital Source 4 14th February 2004 11:59 AM
CS8415A serial data output jimbo69 Digital Source 0 25th February 2003 03:34 PM
crystal CS8415a receiver Thomas Giz Parts 0 5th February 2003 01:53 AM
De-emphasis sylin Digital Source 5 6th May 2002 12:17 PM


New To Site? Need Help?

All times are GMT. The time now is 01:26 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