Sorry I know this belongs in the audio forum but so many learned gents over here.
Recorded a DAT tape yesterday, SPDIF from the deck via lightpipe into Firewire 410, all locked to SPDIF clock, Vegas project set to match tape at 16/48K.
First recording sounded a bit ragged as it was going in, this was a 'duplication master' tape so dropouts aren't uncommon, just worn out tape. So to give it a chance I recorded it a second time, maybe I'd get lucky and be able to patch the two passes together. This usually doesn't work as when ME tape sheds, all the bits fall off. But I digress.
So I load the two recordings into Vegas and start to sync them up, nice sharp click at the start where the engineer switched off his mic at the end of the ident.
But shock, horror. The two recordings are of different lengths. From said 'marker' at the start to another audible marker near the end the first recording is 43:15 long and the second 43:28 (that's mm:ss). And no there isn't just some chunk missing in the middle, there's a constant difference in the speed.
How is this possible?
I've always assummed that DAT and other digital audio devices send X number of samples to Vegas to record and it records that X number of samples, nothing gets done to the data. Now I'm not so certain, well OK as I've seen Vegas resample DV audio as well I'm even less certain it doesn't fiddle with incoming digital audio.
Bob.
Recorded a DAT tape yesterday, SPDIF from the deck via lightpipe into Firewire 410, all locked to SPDIF clock, Vegas project set to match tape at 16/48K.
First recording sounded a bit ragged as it was going in, this was a 'duplication master' tape so dropouts aren't uncommon, just worn out tape. So to give it a chance I recorded it a second time, maybe I'd get lucky and be able to patch the two passes together. This usually doesn't work as when ME tape sheds, all the bits fall off. But I digress.
So I load the two recordings into Vegas and start to sync them up, nice sharp click at the start where the engineer switched off his mic at the end of the ident.
But shock, horror. The two recordings are of different lengths. From said 'marker' at the start to another audible marker near the end the first recording is 43:15 long and the second 43:28 (that's mm:ss). And no there isn't just some chunk missing in the middle, there's a constant difference in the speed.
How is this possible?
I've always assummed that DAT and other digital audio devices send X number of samples to Vegas to record and it records that X number of samples, nothing gets done to the data. Now I'm not so certain, well OK as I've seen Vegas resample DV audio as well I'm even less certain it doesn't fiddle with incoming digital audio.
Bob.