, posted: 11-Apr-2008 16:09
This is a cross between a blog entry and a topic. Bear with me.
For years now on analogue/cable FTA TV I've been hearing a dodgy-sounding audio artefact on broadcast US TV shows - Six Feet Under or The Sopranos for instance. It's most noticeable on music featuring sustained solo notes on violins or flutes and is best described as a regular (1 or 2 Hz-ish) momentary jump, bump or gap in the audio, as if someone stopped a 1/4" takeup spool and then let go, bouncing the tape as it comes to rest.
The thing is, I think I've figured out what it is, from watching Battlestar Galactica Season 3 on DVD. There's an option to choose a 5.1 or stereo soundtrack on these discs. The stereo is sped-up from the original 24fps to 25fps, but pitch-corrected back down. The 5.1 is sped up *and* pitched up from 24 to 25 - just like speeding up an analogue tape.
The artefact I described is exactly what I hear on the stereo DVD soundtrack, and is unbearably bad, especially on the BSG theme tune - that plaintive solo wind instrument and female voice.
Obviously it's a rough-and-ready realtime effect of pitch-correction and speed-adjustment of the soundtrack. It drives me nuts BECAUSE IT'S SOOOOOO BAD AND NO-ONE COMPLAINS.
Well, until now, obviously.
Does anyone know what I mean and/or can shed light?
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