A system for synchronising a rotary member with a series of synchronising pulses, suitable for use in synchronising a film projector with a television scanning raster comprises a rotary member; a divider for obtaining two repetitive signals whose frequency is relatively small from a series of synchronising pulses fed to the said divider; a generator for providing in response to a first of the repetitive signals a repetitive sawtooth wave form of the same fundamental frequency as the first repetitive signal; a synchro-resolver having a stator arranged to be energised by a polyphase signal derived from the second of the two repetitive signals, and a rotor arranged to be driven in accord with the movement of the rotary member; a further generator responsive to the output of the synchro-resolver to provide a series of sampling pulses at a frequency proportional to the output of the synchro-resolver; and a comparator for comparing the phase of the sampling pulses with that of the repetitive sawtooth wave form so as to provide a control signal for operating the rotary member.
An apparatus for displaying a motion picture film on a television receiver are disclosed. The apparatus scans the images of frames from the film strip utilizing a lineal array of photosensitive elements and a scan rate corresponding to the field scan rate of a standard television receiver. A synchronization element controls a reflecting member, for example a rotating drum member having a plurality of mirrors mounted thereon, for providing time conversion from the film scanning rate to the television field scan rate. The reflecting member redirects projected images of the film frames across the array in a predetermined film frame scanning sequence. An electrical circuit sequentially samples the output of the lineal array and provides video output signals in a format compatible with the television receiver. Preferably, the television receiver is a standard, commercially available home television receiver, either in black and white or color. The motion picture film may be displayed over an unused channel of the television receiver.
An image signal conversion apparatus converts an image signal outputted from an image signal generation means into a film record signal in an image signal conversion means, and forms an image on a predetermined film on the basis of the film record signal. A first reference signal for controlling the image signal conversion means is generated on the basis of time information of the image signal generation means, and then a second reference signal for controlling a film recording means is generated on the basis of the first reference signal. Thereby the image signal conversion means and the film recording means can accurately synchronize with the image signal generation means.
