SPDIF clicks and pops

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T

TBM

Member
Joined 2005
Hi

I have a Cambridge DVD79, and a Denon DVD-1920 playing DVD, using digital out coax into DDDAC SPDIF board (CS8414). Schematics on www.dddac.de. I get loud clicks/pops every 5sec-1min on both DVD players on DVD playback; sounds like a static discharge, big transients. Voices sounds a bit distorted, "metallic" like. Not so often clicks on CD playback. DVD and CD media are new with no scratches. Tried to change FILT values on CS8414 (R=1K and C=0.1uF) to C=0.47uF), no significant change. Tried digital pulse transformer on dig in, no change.

Unfortunately, I don't have a scope, only Fluke 189 DMM.

Oh boy am I frustrated. Any tips out there?

Tom, Norway :-(
 
T

TBM

Member
Joined 2005
Yes, I am using the Tent clock as adviced...
So this mean that I have 2 master clocks competing, one in DVD player and one in SPDIF board? Is it normal to construct it this way? Hmmm. Perhaps disable Tent clock and change mode on CS8414? I.e. lift M0 pin from V+ and connet to GND?

Tom
 
R

rfbrw

Member
Joined 2001
TBM said:
Yes, I am using the Tent clock as adviced...
So this mean that I have 2 master clocks competing, one in DVD player and one in SPDIF board? Is it normal to construct it this way? Hmmm. Perhaps disable Tent clock and change mode on CS8414? I.e. lift M0 pin from V+ and connet to GND?

Tom
Click to expand...

If the clock derived from SPDIF drifts from the Tentclock then expect the occassional pop and click. In DVD mode if the audio is anything other than 44k, unlikely I would have thought, then crash, bang, wallop, it all hits the fan. Try running the dac using the MCLK from the CS8414.
BTW, I would not have thought truncating the DVD audio and possibly the CD audio by 8 bits would do much for the sound.
 
dddac

dddac

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Joined 2003
blog.dddac.com
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The reclocking with the Tent clock is meant for playing CD. If you use DVD the output might be 48 or 96 kHz sample rate. This can cause irregular effects like that.

Have you tried a straight forwars CD player or sound card with real 44.1 kHz 16 bit output ?

Indeed, if you want to to tweak the spdif receiver to work with DVD you should change the CS8414 set up to mode 2 by cutting the little wire connections for FS and BCK (this will cut of the Tent Clock) and put pin 23 to ground. Not just like that as you will short the Vd-rail, but by lifting the leg from the chip and connect to ground

doede
 
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