[Chris Hornbeck]

On Mon, 27 Oct 2008 17:06:49 +0000, Don Pearce
wrote:

Arny Krueger wrote:
What about decoding existing Dolby-encoded recordings?

How would you perform the calibration?

I'll have to disagree with several august posters about this.
Dolby B and C levels are referenced to magnetic levels, so any
properly recorded tape will be properly de-encoded if the
playback machine has been calibrated with a reference-level
tape, 400Hz at Dolby reference level of 200nW/m.

Assuming that everything else is up to snuff, natch. A pretty
big assumption these decades later... but fundamentally right.
Dolby B and C do not require tones on every tape for de-encode
tracking.

Much thanks, as always,
Chris Hornbeck