What types of audio artifacts are specifically-associated with VD optical tracks?

Hi:

What types of audio artifacts are specifically-associated with the
variable-density optical tracks of B&W films? What are these artifacts
caused by?


Thanks,

Radium

"Green Xenon [Radium]" wrote:

> Hi:
>
> What types of audio artifacts are specifically-associated with the
> variable-density optical tracks of B&W films? What are these artifacts
> caused by?

Well, I imagine the sensitivity of the film to exposure and the reverse
sensitivity of a photocell to light create a pretty non-linear transfer
characteristic so plenty of distortion would result.

Graham

Eeyore wrote:
>
> "Green Xenon [Radium]" wrote:
>
>> Hi:
>>
>> What types of audio artifacts are specifically-associated with the
>> variable-density optical tracks of B&W films? What are these artifacts
>> caused by?
>
> Well, I imagine the sensitivity of the film to exposure and the reverse
> sensitivity of a photocell to light create a pretty non-linear transfer
> characteristic so plenty of distortion would result.
>
> Graham
>


Does the grainyness of the film affect VD more than VA?

"Green Xenon [Radium]" wrote:

> Eeyore wrote:
> > "Green Xenon [Radium]" wrote:
> >>
> >> What types of audio artifacts are specifically-associated with the
> >> variable-density optical tracks of B&W films? What are these artifacts
> >> caused by?
> >
> > Well, I imagine the sensitivity of the film to exposure and the reverse
> > sensitivity of a photocell to light create a pretty non-linear transfer
> > characteristic so plenty of distortion would result.
>
> Does the grainyness of the film affect VD more than VA?

I have no idea and don't really care. It's such a lo-fi method of sound
recording that it merits no further discussion.

Graham

"Eeyore" <rabbitsfriendsandrelations@hotmail . com > wrote in
message news:480597C7.5508467B@hotmail . com
> "Green Xenon [Radium]" wrote:
>
>> Hi:
>>
>> What types of audio artifacts are
>> specifically-associated with the variable-density
>> optical tracks of B&W films? What are these artifacts
>> caused by?
>
> Well, I imagine the sensitivity of the film to exposure
> and the reverse sensitivity of a photocell to light
> create a pretty non-linear transfer characteristic so
> plenty of distortion would result.

Film's response to light is logarithmic. One reason why variable area
optical sound had so much attraction. Unfortunately, it had problems of its
own.