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Old 17th May 2017, 09:28 AM   #21
isiora is offline isiora  Italy
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Join Date: Nov 2009
Location: Salerno
Quote:
Originally Posted by Idiosyncrasy View Post
Wouldn't that take quite a bit more space though? Very impressed with this project btw!
Of course. In case I decide to replace them, I must review the layout.

Isidoro
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Old 2nd June 2017, 08:58 PM   #22
isiora is offline isiora  Italy
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Default DoP and DoPE decoding

I added DoP and DoPE decoder into FPGA. Now the DAC is capable to play DSD64 and DSD128 from USB and DLNA interfaces. The decoding process is done directly into FPGA. That it is independent from the DAC chip and it works with both the ES9018 and the ES9038.
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Old 13th June 2017, 07:28 AM   #23
bsy020 is offline bsy020  Israel
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So you decode the DSD input to PCM in the FPGA and then feed this to the ESS 9018?
But the ESS9018 converts DSD to PCM, isn't it better to let the ESS9018 do this conversion?
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Old 15th June 2017, 01:14 PM   #24
isiora is offline isiora  Italy
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Originally Posted by bsy020 View Post
So you decode the DSD input to PCM in the FPGA and then feed this to the ESS 9018?
But the ESS9018 converts DSD to PCM, isn't it better to let the ESS9018 do this conversion?
Hi bsy020,
I decode the DoP encoded stream, and under no circumstances I touch the original DSD stream. DoP is an industry open standard and letterally it means DSD over PCM. It allows you to play pure DSD files (.dff, .dsf) on a compliant DoP DAC via a PCM stream. This stream is no longer a stream that contains PCM samples, but is a stream that contains the original, and untouched, DSD bitstream, plus other data useful to recognize it as a DoP stream. Obviousely in order to play DSD files in this way, you need a player or a media server capable to encode the dsd file in a DoP stream.
So, all I do is to recognize and decode the DoP stream into the original DSD bitstream and route it to the DAC chip capable to play DSD.
As you know, all the ES90xx DAC chips are capable to play DSD stream (although they are not pure DSD dac, so they need an internal conversion from DSD to PCM).

For more information on DoP, see http://dsd-guide.com/sites/default/f...andard_1v1.pdf

Kind regards,
Isidoro
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Old 19th June 2017, 10:57 AM   #25
bsy020 is offline bsy020  Israel
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Thanks Isiora for clarifying this point.
Great project.
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