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Viewmaster wrote:....or I can have 2 seperate sets of sync holes in the disc at different radii, one consisting of 32 holes for recording and the other for playback with the missing frame hole. One opto looking at one set of 32 holes for recording and the other opto looking at the other set of 31 holes for playing back.
Any comments please?
Albert.
Stephen wrote:Light from the linear IR source may pass through each scanning aperture momentarily at the start or end of each line, and a photodetector may respond to these optical pulses for synchronisation.
AncientBrit wrote:You can use a mono to delay/phase the detected pulses.
I used a phase locked loop to generate 32 pulses from a single frame hole phased by the mono.
GL
AncientBrit wrote:I generally steer clear of large servo motors.
You need a lot of dc power to lock them and to hold them in synch.
GL
AncientBrit wrote:There was nothing special about the motor, just the standard club cassette type motor and a simple speed lock cct using a 4046 and a darlington NPN.
I presume the inertia of the disc helped. The files titled ..dsc that I posted a few weeks ago were all shot using this camera and there is no hunting or warping of the image.
Perhaps I was lucky.
I generally steer clear of large servo motors.
You need a lot of dc power to lock them and to hold them in synch.
GL
AncientBrit wrote:Gary,
I'm refering to dsc_Graham1.PS7 etc where I've incorporated the dsc in the title.
These were originally recorded using the parallel port of the PC as an interface.
(I don't think I've actually created any .dsc file extensions , only
.PS7 and .001 etc.)
I also wrote a whole suite of NBTV editing and painting programs in VB6 about 6 years ago.
But they all use the "native" format of 64x32 pixels per frame and are not linked to any CD sample rates.
Regards,
Graham
gary wrote:Shows what missing out on the conventions means to us antipodeans, I must get to one, one day, sigh.
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