krochat;194760 Wrote: > A couple of caveats to your calculations. > > 1) IIRC, a new Sheffield direct-to-disk LP had a signal-to-noise ratio > of around 85dB. > > 2) LPs can have signal up to 30dB below the noise floor. There is no > signal below the noise in a CD, but there can be plenty of signal below > the noise on an LP, especially low level ambience cues. > > Using this figures, you'd need 115 DB signal to noise ratio for a CD to > equal a new direct-cut LP. >
I'm a bit skeptical about counting those extra 30 dB below the noise... Shannon-Hartley is a theorem, full stop, end of story, right? I made a mistake above - I forgot a factor of 2 (for stereo) in my estimate of the capacity for LPs. So we can say it like this - if we assume the bandwidth of an LP is 30kHz * 2 channels, we would need 71 dB of S/N to match CD quality. However we're still being pretty generous here, since presumably people can only hear up to 20kHz or so. If we restrict to the audible range, it becomes very simple - the LP would simply need 96dB S/N to match CD. -- opaqueice ------------------------------------------------------------------------ opaqueice's Profile: http://forums.slimdevices.com/member.php?userid=4234 View this thread: http://forums.slimdevices.com/showthread.php?t=34379 _______________________________________________ audiophiles mailing list [EMAIL PROTECTED] http://lists.slimdevices.com/lists/listinfo/audiophiles
