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mannycala  
#1 Posted : Monday, September 25, 2017 6:08:37 PM(UTC)
mannycala

Rank: Member

Groups: Member
Joined: 3/5/2014(UTC)
Posts: 16
Italy
Location: Milano

Dear all,
I’m making a new DIY project for a digital audio player with good quality SPDIF output.

I decided to use the following configuration
- BeagleBone Black with Volumio
- TPA Hermes-BBB Isolator Module
- TPA Cronus Re-clocking Module
- TPA S/PDIF TRANSCEIVER MODULE (WM8804) to convert the I2S signal to SPDIF.

First of all I would like to know if this kind of solution can provide an high quality digital output.
Second point is to ask some help for the correct working of the project.

I assembled all components and configured the spdif transceiver module as described in the manual for i2stospdif

AIF/MS 1
TXSRC 1
AIFCONF1 0
AIFCONF0 1

Powering all boards:
- 5v on Hermes (the hermes gives the power to BBB)
- 5v on Cronus
- 7.5v on SPDIF transceiver

no output sound.

Then I changed the configuration as below:

AIF/MS 0
TXSRC 1
AIFCONF1 0
AIFCONF0 1

and the signal could lock with dac.
Unfortunately the quality is not good. several clips and audible distorsion comes out. Moreover I can't manage the volume through the Volumio Webapp. It seems the too high level creates big distorsion.

Do you have any suggestion to improve my project?

Thanks a lot,
Marco.
miero  
#2 Posted : Wednesday, September 27, 2017 12:46:42 PM(UTC)
miero

Rank: Member

Groups: Member
Joined: 10/22/2011(UTC)
Posts: 135
Location: Prague

Thanks: 1 times
Was thanked: 3 time(s) in 3 post(s)
Configuration seems OK to me, but you can try following:
- AIFCONF1 1
- AIFCONF0 0

And in the BBB remote console (using SSH client) execute following (valid until restart):

echo 16387 > /sys/module/snd_soc_botic/parameters/dai_format

Then stop & retry playback.

If this would not work, please try also reconfigure BBB to generate SPDIF output and try it using directly without S/PDIF transciever:

echo S--- > /sys/module/snd_soc_botic/parameters/serconfig

Then stop & retry playback.
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