[Jukebox-list] Movie Sound

[Ray Finch]

I didn't know about the "swarth" issue - interesting.  You would think 
that they would have had some kind of automatic brush to keep the swarth 
out of the way - odd no one seemed to develop one.

I stand corrected - you are right: variable-area and variable-density are
two different things.  Currently (in addition to the various digital
encoded sound on film systems) variable-area is what you'll see on the
"sound track" portion of modern film.  Also it is varying widths of 
_white_ on a black background on the sound track - not the other way 
around.

BTW, What are list rules for picure attachments?  I have to pictures 
(only about 37KB each) that very well show how sound if encoded on film.

Ray



On Mon, 3 Dec 2007, David Breneman wrote:

>
> --- 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
>
>
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