You are right about the complication, Albert. I was thinking about some threshold rate of motion where frame rate and/or line rate might increase so it would not respond to small changes like moving faces to avoid "hunting" problems. In any case, scanning disc or drum systems would not be suitable due to significant mechanical inertia, but perhaps a variation of the "loudspeaker scanner" would be.Viewmaster wrote:If the motion were of a type which rapidly stopped and started, (like an actor moving his face then not, then moving again), the poor old system would be hunting back and forth would it not, the Nipkow motor taking some milli secs to re adjust speed up and down....or am I misssing something?
And why do we need this additional complication?
As per a previous thread on NBTV signal compression, why do something neat if there is no need, or is it just the challenge?
An additional problem, with respect to changing resolution, would be changing aperture size for the photosensor in the camera and the light source in the display. A camera lens diaphram assembly is a possibility, and John Logie Baird had a plethora of schemes for changing aperture size during scanning in a cyclic manner.
To do this all on the fly though is probably unrealistic and nothing more than a potential challenge. The results would probably not be worth the effort, in any case. What is very possible though is to have a universal camera with selectable frame rates to accomodate available bandwidth and a universal receiver that can automatically track the frame rate of the camera signal.
Now that is a real challenge!Viewmaster wrote:New thought.....Maybe a NBTV system to carry out real life animation frame by frame using the NBTV camera? Store one frame, arrange the animation, press a button on the NBTV camera and another frame is taken and so on.