Color moviola for two-track VTR
AssigneeRCA Corporation
InventorHenry R. Warren
Life of this patent
Estimating the term…
Abstract
When in the high or low speed editing or "moviola" mode, a VTR switches the inputs of Y and C demodulators between the Y and C heads or switches the demodulator outputs as the heads cross tracks. Thus, the Y and C demodulators always receive or provide at least some Y and C signals respectively, thereby making color display during the moviola mode possible.
Claims8
A method for reproducing signals from a multitrack tape having recorded thereon at a selected linear tape speed modulated luminance-representative signals on a first track and first and second chrominance representative signals modulated at first and second carrier frequencies, repectively, on a second track, said method comprising:
- scanning a pair of transducers across said tape using a linear tape speed different from said selected linear tape speed, whereby each of said transducers scans across a plurality of said tracks and alternately transduces said modulated signals;
- coupling the input ports of a pair of demodulators to said pair of transducers and coupling the output ports of said pair of demodulators to utilization means;
- and
- switching one of said input ports and said output ports of said pair of demodulators and said transducers cross said tracks in response to detection of the frequency of one of said first and second carriers.
A tape playback apparatus for reproducing signals from a multitrack tape having at least first and second modulated signals together representing a color television signal recorded at a selected linear tape speed on at least a pair of respective tracks, at least said second modulated signal being modulated by means of a carrier having an identifiable frequency characteristic, said apparatus comprising;
- at least a pair of transducing means adapted to be scanned across said tape using a linear tape speed different from said selected speed where by each of said transducers scans across a plurality of said tracks and alternately transduces said first and second modulated signals;
- at least first and second demodulators each having an input port for receiving transduced signals and an output port for producing demodulated signals from said transduced signals;
- frequency identification means coupled to at least one of said first and second transducing means for generating a control signal identifying those intervals during which said one of said first and second transducing means is transducing said second modulated signal modulated by means of a carrier having an identifiable frequency characteristic, and
- switching and coupling means coupled to said tranducing means, to said frequency identification means and to said input and output ports of said first and second demodulators for coupling transduced signals from said transducing means to said input ports and for switching corresponding ones of said input and output ports of said first and second demodulators under the control of said control signal as said transducing means cross said tracks.
Dependencies are inferred from the claim text.