Dolby Digital Film Scanner Signal

Video signal coming off a Dolby Digital film projector soundhead as shown on an oscilloscope screen.

Higher the trace = greater brightness while the horizontal plane represents the width of the scanned area of the film. The line across the top is the brightness that is scanned when the sprocket hole passes the scanner. The bumps are the minor variations in brightness caused by the 24 individual tiny LEDs...which are pretty much out of the focal plane but show up a little.

The fuzzy flickering area below is the actual digital data dots being scanned and the pattern is changing rapidly which accounts for the amorphous look to that area.

This is with a Kelmar "basement" reader on a Simplex 5-Star soundhead feeding a CP500D.

Category:

Film & Animation

Tags:

• digital
• sound

[IntermittentSprocket]

Looks like the waveform on an oscilloscope.