morris_minor wrote: > Doesn't one of the differences in sound between LP and CD have to do > with the filtering of high frequences by CD? Musical information - in > the form of harmonics - extends way beyond the 20KHz barrier of a CD, > and even if you can't identify the sound at high frequencies they must > (surely?) influence the tonal characteristic of the fundamental note > you can hear.
What do you mean "must" contain? There may be a small amount of material, but all of the equipment used to record rolls off at or below 20kHz. Mics, track tapes, mastering tapes, monitoring speakers. And on the playback side, very few, if any cartridges have much response at ultrasonic frequencies, the RIAA curve rolls off high frequencies and if implemented with a simple LRC circuit (which is what nearly all systems do) it keeps rolling off at higher frequencies. The RIAA curve is down 20dB at 20kHz Its likely to roll off at 6dB/octave or faster, at each step of the recording process. -- Pat Farrell http://www.pfarrell.com/ _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
