All times are UTC+01:00




Post new topic  Reply to topic  [ 42 posts ]  Go to page Previous 1 2 3 4 5 Next
Author Message
PostPosted: Thu Jun 14, 2018 7:31 pm 

Joined: Thu Jun 14, 2018 7:09 pm
Posts: 1
I have two transmitters on the same frequency within 15 miles of each other (SFN) with audio delivered to each TX site via an Internet stream (as no radio STL links are possible).

The transmitters have GPS timing inputs (10 MHz and 1 PPS) insuring carrier and pilot frequency lock, however there is currently no synchronization of the audio between the two sites, hence a poor listening experience. The transmitters have L/R analog, AES/EBU and composite (MPX on BNC connector) inputs.

My question: How might Stereo Tool be deployed in this scenario to synchronize the audio? One instance of ST running at each site? If "yes", how is the synchronization accomplished? That is, is the ST synchro function 'dynamic'; is it able to correct for 'drifting' time delay that might be caused by the nature of Internet packet delivery? Or (more likely) am I thinking about this from inside the box?

Thanks for any insight!


Top
   
PostPosted: Mon Jul 23, 2018 10:47 pm 
Site Admin
User avatar

Joined: Mon Mar 17, 2008 1:40 am
Posts: 11185
Stereo Tool won't do this (SFN). But MicroMPX soon will!! Stand by.........

(Synchronization needs to be accurate below 1 microsecond. MicroMPX has GPS support - it works in the lab, so soon also in the released version).


Top
   
PostPosted: Thu Aug 02, 2018 8:22 pm 

Joined: Thu Aug 02, 2018 8:13 pm
Posts: 1
When you say, "Stereo Tool won't do this (SFN). But MicroMPX soon will!! Stand by........."

Are we talking about SFN/GPS sync of MicroMPX being supported in the SST software release?


Top
   
PostPosted: Sat Jan 19, 2019 5:10 pm 
User avatar

Joined: Tue Mar 04, 2014 10:17 am
Posts: 65
could someone record what happens when trying out SFN in FM?
Unfortionaly I have no stations to try this on, because all are synchronized or don't use the same frequencies

maybe a drive from one TX to other so I can hear this sweat silence that everyone is talking about and I cannot experience it unfortunately


Top
   
PostPosted: Tue Jan 22, 2019 10:30 am 
Site Admin
User avatar

Joined: Mon Mar 17, 2008 1:40 am
Posts: 11185
Quote:
When you say, "Stereo Tool won't do this (SFN). But MicroMPX soon will!! Stand by........."

Are we talking about SFN/GPS sync of MicroMPX being supported in the SST software release?
Yes. (Sorry, it hasn't been exactly "soon"). It's working in the lab here.


Top
   
PostPosted: Sat Jan 26, 2019 6:30 am 

Joined: Sat Apr 01, 2017 10:21 pm
Posts: 22
Hans...I have 2 transmitters on a SFN that use uMPX. I was able to slightly delay one of them using the delay slider on the uMPX decoder, but it doesn't account for variations in travel time through the network. Is what you're testing going to allow the uMPX decoders to lock to GPS so they can be very precisely time-synchronized? If so, I'm very, very interested in this. I'd even be willing to test this in real world conditions if you need.


Top
   
PostPosted: Sat Jan 26, 2019 10:08 am 
User avatar

Joined: Tue Sep 15, 2015 12:22 pm
Posts: 362
Quote:
Is what you're testing going to allow the uMPX decoders to lock to GPS so they can be very precisely time-synchronized?
Yes!

_________________
Imaging producer & Stereo Tool audio processing consultant


Top
   
PostPosted: Sat Jan 26, 2019 8:54 pm 

Joined: Sat Apr 01, 2017 10:21 pm
Posts: 22
Awesome...thanks Mathijs! Looking forward to this feature :D


Top
   
PostPosted: Sun Jan 27, 2019 8:34 pm 
User avatar

Joined: Tue Mar 04, 2014 10:17 am
Posts: 65
can someone record there thests and upload them to youtube please, I would love to try that, but I have only 1 transmitter


Top
   
PostPosted: Sun Jan 27, 2019 10:15 pm 
Site Admin
User avatar

Joined: Mon Mar 17, 2008 1:40 am
Posts: 11185
Quote:
Hans...I have 2 transmitters on a SFN that use uMPX. I was able to slightly delay one of them using the delay slider on the uMPX decoder, but it doesn't account for variations in travel time through the network. Is what you're testing going to allow the uMPX decoders to lock to GPS so they can be very precisely time-synchronized? If so, I'm very, very interested in this. I'd even be willing to test this in real world conditions if you need.
We are going to need some best testers when this is ready...


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 42 posts ]  Go to page Previous 1 2 3 4 5 Next

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