DSRLL and jitter. - 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 26th May 2004, 01:13 PM   #1
pro is offline pro  Italy
diyAudio Member
 
pro's Avatar
 
Join Date: Feb 2004
Location: Milano
Default DSRLL and jitter.

I just bought a Teac VRDS-8.
The Teac boasts that the DSRLL (Double Servo Ratio Looked Loop) is able to reduce jitter of 40dB.
Now, listening at the bass of this CDP respect my old Philips 582 with no O/S tda 1541 saa7220 (bypassed) saa7210 connected to Kwak clock (tanks Elso) passive I/V and discrete jfet-fet output stage, and to my Sony CDX720E with Tent clock and the dac coupled to output directly with a couple of mu-metal trafo for L/P filter end line driving, the Teac seems to be better for extension in the deepest frequency and not worse for timing.
Where it leaves to wish, it is in the hf area, where it is for sure sharper.
My question is.
Do must I to modify the clock of these CDP or it is not necessary?
The schematic looks quiet the same of the teac VRDS-25 CXD2545Q (CD-Decoder 16.9344MHz), AD1893 (ASRC 18.432Mhz), SM5843, uPD65031 , 2 PCM1702K per channel.
After the 18.432Mhz there are a lot of 74HCxxx family, (peraps (15) before the clock signal arrivs to dacs, so I would not know not even where to connect an eventual one clock generator (Kwak i think).
some one could help me?
Tanks.
Pro.
  Reply With Quote
Old 26th May 2004, 03:13 PM   #2
diyAudio Member
 
Join Date: Dec 2001
Location: Eindhoven
Default Re: DSRLL and jitter.

Quote:
Originally posted by pro
I just bought a Teac VRDS-8.
The Teac boasts that the DSRLL (Double Servo Ratio Looked Loop) is able to reduce jitter of 40dB.
Now, listening at the bass of this CDP respect my old Philips 582 with no O/S tda 1541 saa7220 (bypassed) saa7210 connected to Kwak clock (tanks Elso) passive I/V and discrete jfet-fet output stage, and to my Sony CDX720E with Tent clock and the dac coupled to output directly with a couple of mu-metal trafo for L/P filter end line driving, the Teac seems to be better for extension in the deepest frequency and not worse for timing.
Where it leaves to wish, it is in the hf area, where it is for sure sharper.
My question is.
Do must I to modify the clock of these CDP or it is not necessary?
The schematic looks quiet the same of the teac VRDS-25 CXD2545Q (CD-Decoder 16.9344MHz), AD1893 (ASRC 18.432Mhz), SM5843, uPD65031 , 2 PCM1702K per channel.
After the 18.432Mhz there are a lot of 74HCxxx family, (peraps (15) before the clock signal arrivs to dacs, so I would not know not even where to connect an eventual one clock generator (Kwak i think).
some one could help me?
Tanks.
Pro.
Hi

It is my experience that changing clock brings resolution, reduces harshness and reduces stress

The clock in the 8 is not worlds' best, but the 8 is easilly modified, unlike the 9

cheers
__________________
Guido Tent
www.Tentlabs.com
  Reply With Quote
Old 26th May 2004, 03:24 PM   #3
Banned
 
Join Date: Dec 2001
Location: Zamboanga, City of Flowers, Mindanao
Send a message via Yahoo to Elso Kwak
Lightbulb To clock or not to clock

Hi pro,
Best replace both clocks in the Teac: one for the digital signal processor/decoder and one for the sample rate converter.

I have the same experience as you regarding the sound of the Sony based Teac and a Philips. The Sony is sharper in the highs.
  Reply With Quote
Old 26th May 2004, 03:45 PM   #4
pro is offline pro  Italy
diyAudio Member
 
pro's Avatar
 
Join Date: Feb 2004
Location: Milano
Sorry Elso (can I call you Elso?), but I meant to say that the Teac is sharper, not the Sony. Maybe because of the transformer output stage, but the my Sony is at least delicate like the Philips in the High frequency. Where it loses is in the width of the soundstage, that is a little bit larger in the Philips and in the Teac to.
So, can I mail to you schematics, so that you can tell me where connect your clock?
Another question. Is possible to buid the two clocks on one board, sharing the same power supply circuit, or it is better to buil two separate boars.
Thanks.
__________________
Michele
  Reply With Quote
Old 26th May 2004, 03:51 PM   #5
Banned
 
Join Date: Dec 2001
Location: Zamboanga, City of Flowers, Mindanao
Send a message via Yahoo to Elso Kwak
Quote:
Originally posted by pro
Sorry Elso (can I call you Elso?), but I meant to say that the Teac is sharper, not the Sony. Maybe because of the transformer output stage, but the my Sony is at least delicate like the Philips in the High frequency. Where it loses is in the width of the soundstage, that is a little bit larger in the Philips and in the Teac to.
So, can I mail to you schematics, so that you can tell me where connect your clock?
Another question. Is possible to buid the two clocks on one board, sharing the same power supply circuit, or it is better to buil two separate boars.
Thanks.
Hi Pro, Yes you may call me Elso. Maybe I was generalising too much regarding the sound difference.
If you mail me the schematics I can help you better. I would not share the powersupplies between the clocks.

  Reply With Quote
Old 26th May 2004, 03:56 PM   #6
pro is offline pro  Italy
diyAudio Member
 
pro's Avatar
 
Join Date: Feb 2004
Location: Milano
Thanks Elso, I will mail you schematics later. I have them at home.
__________________
Michele
  Reply With Quote
Old 27th May 2004, 12:49 PM   #7
pro is offline pro  Italy
diyAudio Member
 
pro's Avatar
 
Join Date: Feb 2004
Location: Milano
For Elso.
Did you reveive schematics?
Ciao
__________________
Michele
  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
generate jitter test signal and measurign jitter using AP2? BJAMR Digital Source 11 1st November 2010 03:07 PM
Jitter in DAC. ghee0 Digital Source 44 3rd June 2010 10:25 AM
CD - P jitter Q's Joules Digital Source 8 9th February 2006 03:03 AM
DAC Jitter hifidan Digital Source 3 20th December 2004 06:39 PM
Data Jitter Versus Electrical Jitter? 300_baud Digital Source 8 16th July 2004 08:59 PM


New To Site? Need Help?

All times are GMT. The time now is 06:44 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