Hi!
Just received a Pi B+ and the Digi+, plugged it together, booted with Volumio-Card and it played fine.
Very happy with that.
But I had to find out that Stereo sound is not upmixed to 5.1-sound - not so happy anymore.
I checked various configurations in /etc/asound.conf, but could not get it working.
Do you have a configuration working on Pi+ and Digi+ to upmix stereo-sound to 6-channel output?
Thanks for any suggestions.
Hansjörg
Date
Votes
5 comments
-
HiFiBerry team Dear Hansjörg,
I don't think that Volumio (or any other distribution) has implemented this functionality. This would need not only upmixing but also live-encoding into Dolby Digital or DTS. I guess, the Raspberry Pi is not powerful enough for this. However you can ask the Volumio developers if this is possible.
Best regards
Daniel -
hifi Hi Daniel,
thanks for your answer.
I'm not too firm with audio data streams, but i hoped, upmixing could be done quite simple - without full recoding.
I tried accordingly to http://www.mythtv.org/wiki/ALSA_upmixing but without great success.
Quite disappointig as an usb-soundcard, which I used for comparison, sent the stereo-signal as 5.1 sound to my amplifier - without any "help".
(Used with RuneAudio, similar to Volumino but based on ArchLinux.) -
HiFiBerry team Dear HiFi,
the HiFiBerry Digi (and all other current HiFiBerry products) is a stereo sound card, not a 6-channel card. Therefore you won't find any 5.1 configurations.
Best regards
Daniel -
hifi Hi Daniel,
well, that sounds different on your product-page describing the Digi+:
"Bit-perfect output, audio data stream will not be modified in any way"
What happens when the Pi sends a 5.1 audio stream to the Digi+? Only two channels will be forwarded to the electrical/optical connectors?
Regards
Hifi -
HiFiBerry team Hi,
a bitstream will be exactly send to the digital output as it is (except for the SPDIF protocol overhead that it needed to implement SPDIF). If a software creates an Dolby Digital or DTS bitstream, the Digi will output it. However the application has to do this encoding. This is not something that the sound driver does.
An SPDIF interface has no mode for more than 2 channels. It supports 2-channel audio or bitstream transport. In bitstream mode, the interface just send the bits as they are coming without having an idea what it is. For multichannel-audio this has to be a AC-3 (Dolby Digital) or DTS datastream to be decoded by an AV receiver. This is supported by the HiFiBerry Digi.
Best regards
Daniel
Please sign in to leave a comment.