[Jukebox-list] Movie Sound

[David Breneman]

--- Ray Finch <babylon at swcp.com> wrote:

> Each record and film reel only lasted 11 minutes.  The records were
> 33 1/3 
> RPM and were 16 inches in diameter.  The record spiraled from the
> inside 
> out to make it easier to line up the needle with the mark on the
> record label.

The advantage was also that in cutting the record, the spiral
of the groove makes the "swarth" (the material cut out of
the blank) accumulate inward of the cutting stylus.  Since
the recording engineer usually had his hands full during a
take, cutting from the inside out meant that he didn't have
to constantly brush or blow the accumulated swarth out of
the way of the advancing cutting head.

> Variable density soundtrack is indeed the sound on film process. 
> The film 
> has a track that has sound encoded in varying widths of black on
> the film 
> representing the amplitude of the sound at that moment. 

Be careful - you're confusing variable-area with variable-
density here.  A variable-area soundtrack looks like a
mirror-image wavy line.  A variable-density sountrack
looks like a series of horizontal lines varying in
thickness.


David Breneman         david_breneman at yahoo.com


      ____________________________________________________________________________________
Be a better sports nut!  Let your teams follow you 
with Yahoo Mobile. Try it now.  http://mobile.yahoo.com/sports;_ylt=At9_qDKvtAbMuh1G1SQtBI7ntAcJ