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In Reply to: RE: Highest frequency presnt on LPs? posted by thekong on September 22, 2009 at 22:20:49
The old CD-4 quadraphonic records from the 1970s used a 30KHz carrier frequency to carry the R and L difference signals. The Shibata fine line stylus profile was invented to read that carrier frequency. You can read some details of how CD-4 worked on Wikipedia at the link below.
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But 29k is conspicuously low for tape deck bias.
bring bac k dynamic range
It might be a cantilever resonance.
Or flyback from a monitor.
Many older recordings contain NTSC or PAL whine. Newer ones can have
anything from 15kHz upwards, depending on the type of computer CRTs in the studio. Thank goodness for LCDs...
bring bac k dynamic range
... which he initially only noticed [i]visually[/i]. The record was profoundly iridescent.
He mentioned this in an interview a while back. Maybe with George Cardas?
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