26 May
2012
26 May
'12
4:48 p.m.
On 26 May 2012 at 18:50, Toby Thain wrote:
Not so long ago, film soundtracks worked this way...
Excuse me?
I'm familiar with both common sound-on-film systems (Fox andWestern
Electric Variable density and RCA Photophone Variable Area).
Neither uses ink. The RCA system used a galvanometer-and-mirror
setup that recorded a variable-width-spot on the film sound track.
The WE system used a variable-width-slit type of galvanometer light
valve that varied the amount of light passing; the Fox system used a
gas-discharge tube to provide varying light intensity. The RCA
system was not affected to the extent of the VD systems were by the
developing and copying process, but RCA was not quite as sensitive.
Both date from the late 20s/early 30s and can be played back using
the same equipment.
But no ink-on-paper.
--Chuck