All times are UTC+01:00




Post new topic  Reply to topic  [ 9 posts ] 
Author Message
 Post subject: MicroMPX on Raspberry Pi
PostPosted: Sun Jan 06, 2019 3:15 am 

Joined: Sun Aug 23, 2015 3:50 pm
Posts: 28
Hi,

I decided to test out MicroMPX on the Raspberry Pi using the HifiBerry and DAC+ Pro (with XLR output). When I send audio from a Windows 7-based processor, it sounds very distorted on the air. The same Windows machine sounds great when using its own internally 192 Khz sound card.

The RDS comes through just fine. The audio sounds like it is being clipped somewhere, although the levels on the output of the Raspberry Pi are where they should be.

Are there command line items to try for the Raspberry Pi version? Any suggestions on tracking down the distortion?

Thanks in advance.


Top
   
PostPosted: Sun Jan 06, 2019 6:18 pm 

Joined: Sun Aug 23, 2015 3:50 pm
Posts: 28
Quote:
Hi,

I decided to test out MicroMPX on the Raspberry Pi using the HifiBerry and DAC+ Pro (with XLR output). When I send audio from a Windows 7-based processor, it sounds very distorted on the air. The same Windows machine sounds great when using its own internally 192 Khz sound card.

The RDS comes through just fine. The audio sounds like it is being clipped somewhere, although the levels on the output of the Raspberry Pi are where they should be.

Are there command line items to try for the Raspberry Pi version? Any suggestions on tracking down the distortion?

Thanks in advance.
This looks to be a problem with the 9.20 build. I tried version 9.11 of the receiver and all works well.


Top
   
PostPosted: Wed Jan 09, 2019 9:29 pm 

Joined: Tue May 31, 2016 9:31 pm
Posts: 10
Yes, same problems here. Version 9.11 works fine, newest version sounds distorted


Top
   
PostPosted: Sat Jan 12, 2019 5:31 pm 

Joined: Sun Aug 23, 2015 3:50 pm
Posts: 28
Quote:
Yes, same problems here. Version 9.11 works fine, newest version sounds distorted
A new 9.21 build is up on the download site and it works fine now.


Top
   
PostPosted: Sun Jan 27, 2019 10:12 pm 
Site Admin
User avatar

Joined: Mon Mar 17, 2008 1:40 am
Posts: 11185
I'm sorry, I think I broke something in the 9.20 build. Which is fixed again now indeed. I rewrote some code for Stereo Tool which was also used inside MicroMPX - but I overlooked that.


Top
   
PostPosted: Thu Jan 31, 2019 9:25 pm 

Joined: Tue May 31, 2016 9:31 pm
Posts: 10
When I download the latest version from the Download section I get an error when executing the program. (I have done chmod for execute)

The older version (911) works fine


Top
   
PostPosted: Fri Feb 15, 2019 11:04 am 
Site Admin
User avatar

Joined: Mon Mar 17, 2008 1:40 am
Posts: 11185
Quote:
When I download the latest version from the Download section I get an error when executing the program. (I have done chmod for execute)

The older version (911) works fine
Can you try again? I just found out yesterday that there was a mixup in the uploads - I added x86 Linux builds but unfortunately they had the same name :(


Top
   
PostPosted: Fri Mar 01, 2019 2:24 pm 

Joined: Sun Aug 23, 2015 3:50 pm
Posts: 28
This works great now.

I have one question and a feature request. How does the backup file work? What format works?

As a feature - it would be great if we could use a M3U playlist to point to a set of MP3's that would play (and repeat) on disconnect.


Thanks.


Top
   
PostPosted: Fri Mar 01, 2019 4:52 pm 
User avatar

Joined: Tue Sep 15, 2015 12:22 pm
Posts: 362
It can only be wav or flac, one channel at 192000Hz samplerate, containing full MPX. MicroMPX does not contain an FM modulator so playing MP3's is not going to work. You can use WatchCat to generate an MPX file, though (see https://www.stereotool.com/download/).

_________________
Imaging producer & Stereo Tool audio processing consultant


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 9 posts ] 

All times are UTC+01:00


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Limited