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Old 1st March 2008, 05:51 PM   #181
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Quote:
Originally posted by dusfor99

DSD5 to DSD1
DSD6 to DSD4 to DSD2.

Dustin, I know it connected internally, but would it hurt to also tie DSD3 to DSD1? Or do I need to leave it floating?
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Old 1st March 2008, 06:01 PM   #182
rossl is offline rossl  United States
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Quote:
Originally posted by Russ White



Oh I certainly agree it probably not worth bothering with!

That said, I actually do have several older CDs that do have pre-emphasis. But I rarely play them.

It just seemed like a natural thing to do.

You would be amazed how many emails I get asking about it.

Cheers!
Russ

Doesn't the CD player handle it, anyway?

Since we are using Oppos and Denons as transports and picking the data off just before their DAC chips, the controller should have recognized that de-emphasis is needed and apply the DSP.

Right?
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Old 1st March 2008, 06:03 PM   #183
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Well not everyone is going to use it with a CDP like that. Everyone has their own setup scheme and they want the DAC's to be as versatile as possible.
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Old 1st March 2008, 06:05 PM   #184
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Quote:
Originally posted by rossl



Doesn't the CD player handle it, anyway?

Since we are using Oppos and Denons as transports and picking the data off just before their DAC chips, the controller should have recognized that de-emphasis is needed and apply the DSP.

Right?

How can you assume what CDP a person is using with the DAC? I have folks using my DACs with all sorts of transports, most (all that I know of even my Denons) leave the PCM intact (straight from the Disc) through SPDIF.

If you have a CS8416 or Wm8804 watch the deemph flag, some very old CDs will light it up.

Cheers!
Russ
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Old 1st March 2008, 06:32 PM   #185
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One note, I actually don't even see any register to check for detecting pre-emphasis when using SPDIF input.... This seems a little odd to me unless it is handled automatically.
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Old 1st March 2008, 07:31 PM   #186
rossl is offline rossl  United States
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In that case you will need a SPDIF receiver (Wolfson, CS, etc.) to check the de-emp flag, and the microcontroller will have to watch the flag and set the register in the Sabre8.
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Old 1st March 2008, 07:33 PM   #187
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Quote:
Originally posted by rossl
In that case you will need a SPDIF receiver (Wolfson, CS, etc.) to check the de-emp flag, and the microcontroller will have to watch the flag and set the register in the Sabre8.

Yes, I knew I could do that, but I figured that since they implemented a SPDIF receiver they may also check the flags present on the SPDIF signal.

I hope Dustin chimes in on this as I wonder if its tucked away in there some place.
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Old 1st March 2008, 08:43 PM   #188
jargon is offline jargon  United Kingdom
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Better late than never....

I expect to have in the sunny UK by mid March :-

http://www.esstech.com/products/digi...italaudio.shtm
(ES9008) parts samples

///////////
It would be nice to see these chips on PCBs across the UK before summer.
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Old 1st March 2008, 09:47 PM   #189
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Default Updated/Corrected schematic

Ok, assuming that its ok to connect DSD1 and DSD3 I am using Dustin's recommendation for supporting 3 signal input and PCM/DSD/SPDIF inputs.

I am using a small PIC12F629 just to do basic configuration like PCM format etc, as well as change the automute setting (thanks Ross!).

More complex control can be added via a separate PCB, and you can simply omit the PIC if you like as it will be socketed.

I am a bit curious about the comparator bit at the SPDIF input. I have never used such a circuit. Does that part look ok? I basically copied that piece from the eval board schematic.

Thanks for the great input so far.

Cheers!
Russ
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File Type: pdf schem.pdf (18.2 KB, 785 views)
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Old 1st March 2008, 09:59 PM   #190
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top(preliminary)
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