HDMI - SPDIF convertor

ashaw · 25th March 2010, 01:01 PM

HDMI PCM audio -> 4*SPDIF digital outputs

Is anyone interested in this, as I am trying to convince the HDFury people to add it

SoNic_real_one · 25th March 2010, 04:26 PM

Well... you still need to have a receiver/DAC with 4 SPDIF inputs that can be used simultaneous.

The closest thing of that is the DenonLinkIII that has 3 channels (same protocol like SPDIF, has an extra channel for encryption/revers channel communication/sync with DAC).

On eBay and somewhere else there is already a converter that takes LPCM from HDMI and makes 8 analog channles. For 128USD.

Pano · 25th March 2010, 04:57 PM

Interesting device. Thanks for posting it.
Wonder if it's worth hacking into? Like redoing the analog circuits and such for a nice HDMI DAC.

[IDC]Dragon · 25th March 2010, 06:18 PM

Now that's an interesting box!

I didn't know such exists, never liked to add a bulky AVR when all I want is to extract the sound and feed it to mostly existing components. Digital output would be nice, but can probably be retrofitted. The cheap box lacks speaker management, delays and bass assignment.

Once I got the keyword, Google found me another interesting box which does so. Unfortunately in "announced" state since > 1 year.

Does anybody know of other HDMI audio decoders? My ideal one would have XLR outputs and doubly serve as a good DAC for the front channels. Multiple HDMI welcome...

Jörg

SoNic_real_one · 25th March 2010, 06:31 PM

At one point I have inquired about the DAC's they have and it was some CS cip, but I didn't save the name.
So I guess one can tap into the i2s lines of the DAC's and do whatever...
Remember, it doesn't decode anything, it just "extracts" LPCM from HDMI.

Pano · 25th March 2010, 11:22 PM

Sure. Looking at their signal path diagram, it seems that the HD stuff like the Dolby TrueHD is only pass thru. And the encoded streams like DTS, AC-3 go only to the optical out. That might be a severe limitation.

But if you can get your source to send LPCM to the box, you might have a nice HDMI DAC. Either pick up the digital stream (I2S or other) and use your own DAC chips, or simply use the Crystal DAC chips and do better power supplies, output stages, etc.

Might be nice with a DVD/SACD like the Oppo or Yamaha, or for more control a Xonar sound card with HDMI out. Multi-channel or PC based active crossover.

SoNic_real_one · 25th March 2010, 11:34 PM

Quote:

Originally Posted by [IDC]Dragon

Once I got the keyword, Google found me another interesting box which does so. Unfortunately in "announced" state since > 1 year.

Supported Audio Formats:
Dolby Digital 5.1 (AC3), Dolby Pro Logic II, LPCM HDMI direct (up to 6 channels)

All for a mere 551 Euros

ashaw · 26th March 2010, 12:43 AM

these are interesting devices, the reason that I am asking is that many people here make their own DACs and they may want a format that they can use.

The analog out device looks interesting as a mod project.

gooki · 26th March 2010, 02:13 AM

Just be aware any such device won't be HDCP complaint, unless they're adding the features after HDCP certification.

HDCP dictates than you can only output 2 channels of audio digitally unprotected

Quote:

Does anybody know of other HDMI audio decoders? My ideal one would have XLR outputs and doubly serve as a good DAC for the front channels. Multiple HDMI welcome.

Yeah I've got one - 2 channel spdif + 8 channel analog.

[IDC]Dragon · 26th March 2010, 06:26 AM

Quote:

Originally Posted by gooki

Yeah I've got one - 2 channel spdif + 8 channel analog.

Cool, what's that? (The component side picture is blurry, I can't read the chips.)

Jörg

View Poll Results: DO you want a HDMI -SPDIF convertor
No	9	16.36%
yes < $200	37	67.27%
Yes > $200	9	16.36%
Voters: 55. You may not vote on this poll

25th March 2010, 01:01 PM	#1
ashaw diyAudio Member Join Date: Jul 2006	HDMI - SPDIF convertor HDMI PCM audio -> 4*SPDIF digital outputs Is anyone interested in this, as I am trying to convince the HDFury people to add it

25th March 2010, 04:57 PM	#3
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Interesting device. Thanks for posting it. Wonder if it's worth hacking into? Like redoing the analog circuits and such for a nice HDMI DAC. __________________ Take the Speaker Voltage Test!

25th March 2010, 11:22 PM	#6
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Sure. Looking at their signal path diagram, it seems that the HD stuff like the Dolby TrueHD is only pass thru. And the encoded streams like DTS, AC-3 go only to the optical out. That might be a severe limitation. But if you can get your source to send LPCM to the box, you might have a nice HDMI DAC. Either pick up the digital stream (I2S or other) and use your own DAC chips, or simply use the Crystal DAC chips and do better power supplies, output stages, etc. Might be nice with a DVD/SACD like the Oppo or Yamaha, or for more control a Xonar sound card with HDMI out. Multi-channel or PC based active crossover. __________________ Take the Speaker Voltage Test!

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25th March 2010, 04:26 PM	#2
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	Well... you still need to have a receiver/DAC with 4 SPDIF inputs that can be used simultaneous. The closest thing of that is the DenonLinkIII that has 3 channels (same protocol like SPDIF, has an extra channel for encryption/revers channel communication/sync with DAC). On eBay and somewhere else there is already a converter that takes LPCM from HDMI and makes 8 analog channles. For 128USD.

25th March 2010, 06:18 PM	#4
[IDC]Dragon diyAudio Member Join Date: Dec 2008	Now that's an interesting box! I didn't know such exists, never liked to add a bulky AVR when all I want is to extract the sound and feed it to mostly existing components. Digital output would be nice, but can probably be retrofitted. The cheap box lacks speaker management, delays and bass assignment. Once I got the keyword, Google found me another interesting box which does so. Unfortunately in "announced" state since > 1 year. Does anybody know of other HDMI audio decoders? My ideal one would have XLR outputs and doubly serve as a good DAC for the front channels. Multiple HDMI welcome... Jörg

25th March 2010, 06:31 PM	#5
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	At one point I have inquired about the DAC's they have and it was some CS cip, but I didn't save the name. So I guess one can tap into the i2s lines of the DAC's and do whatever... Remember, it doesn't decode anything, it just "extracts" LPCM from HDMI.

26th March 2010, 12:43 AM	#8
ashaw diyAudio Member Join Date: Jul 2006	these are interesting devices, the reason that I am asking is that many people here make their own DACs and they may want a format that they can use. The analog out device looks interesting as a mod project.

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