On Sat, 2026-05-02 at 11:03 -0400, Frank Bures wrote: > I've had an original Cream LP in the early 70's that had 50Hz hum recorded > in it. The song would end and the hum would become obvious. Then the hum > would end in the between-the-songs gap, it would start again and a second > or two later the song would start, masking the hum. And as I say, it was > not some pirate copy, it was the official release. Studio recording, not > live.
Very odd. Usually mastering is a very precision business, with a lot of attention paid to how you'll cram more audio into a record than it can manage. I can only imagine that /that/ day someone was just watching metering and not listening, a cardinal sin in audio production. It's probably worth more, now, to a collector because it's wrong. :-\ We had an unknown hum loop problem one day while doing a week of sports filming. We were using SDI (serial digital interface) equipment, and the signal was going haywire. With analogue gear, you'd see immediate tell-tale signs of what the problem was, but not with digital. It just stops working properly, and you have to try to figure out why. I brought an analogue scope in. You can't decode the signal with it, but you can look at the integrity of its shape, and immediately saw a small mains hum on the signal. A camera was mounted on a lighting pole at the edge of an arena, and it'd bitten through the insulating pad on the mount, there was a small voltage difference between the grounded pole and the building it was cabled to. Nothing dangerous, nothing you could even feel, but it completely disrupted the digital signal. And that's the kind of thing you could be faced with ethernet cabling around a house or building. Small amounts of unwanted hum or noise that is enough to mess up the small amounts of signalling that ethernet uses, and no real clues as to what the problem is caused by. All your computer tells you about is things like packet loss (the effect, not the cause). You need *proper* ethernet test tools to diagnose cabling problems. -- uname -rsvp Linux 3.10.0-1160.119.1.el7.x86_64 #1 SMP Tue Jun 4 14:43:51 UTC 2024 x86_64 (yes, this is the output from uname for this PC when I posted) Boilerplate: All unexpected mail to my mailbox is automatically deleted. I will only get to see the messages that are posted to the mailing list. -- _______________________________________________ users mailing list -- [email protected] To unsubscribe send an email to [email protected] Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/[email protected] Do not reply to spam, report it: https://forge.fedoraproject.org/infra/tickets/issues/new
