Film-Tech Forum ARCHIVE: Prometheus - popping noise (audio watermarking?)

This is topic Prometheus - popping noise (audio watermarking?) in forum Digital Cinema Forum at Film-Tech Forum ARCHIVE.

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Posted by Dave Macaulay (Member # 813) on 06-11-2012, 01:30 AM:

Anyone getting nasty popping sounds in Prometheus? Deluxe suggests downgrading to a lower Doremi server firmware version (v21.04h-aud-on) that I have only been using with older series encryption ("Dolphin") cards that don't accept current firmware. This doesn't seem quite right to me: as I understand the situation, this firmware is only for servers that can't run 21.2k...

Posted by David Zylstra (Member # 4230) on 06-11-2012, 12:51 PM:

A notification I saw from DoReMi in December (about Chipmunks) said the issue noted for that feature was "static popping" with audio watermarking on. The software version mentioned is 2.2.X (meaning all 2.2 versions at that time)

I do have 1 site that complained about odd audio issues that happened in 2 auditoriums for Prometheus 3D, I'm waiting to hear back what the issue turned out to be.

Posted by Geoff Newitt (Member # 6663) on 06-11-2012, 01:16 PM:

Yes, there's an issue with audio watermarking in Doremi servers; I'm not clear on all the details, seems to be specific to software series 2.2.X.

There's a patch out there that disables the audio watermark and the popping goes away; then, if the server is on the latest soft and firmwares, Doremi will open a ticket that should ultimately lead to replacement of the Dolphin board.

Seems only to affect certain boards - I had a call out over the Jubilee weekend (to a cinema with no remote monitoring); one screen had popping in Prometheus, the other - consecutive serial number on the server, both installed the same week - was just fine.