Method of and means for checking the correlation of two data carriers
AssigneesKarl Vockenhuber, Raimund Hauser
InventorOtto Freudenschuss
Life of this patent
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Abstract
If a cine film is to be projected to the accompaniment of a sound track on a separate tape it is necessary to cheek that the film and the sound track are correctly coordinated. This is ensured by reading a code mark from the sound track and using it to slow or stop the motion of the film. The point at which the film motion is slowed or stopped is used to evaluate the relative position of the film with respect to the sound track and thus check that correct coordination is present. This evaluation may take place visually or automatically. In the latter case the prolonged presence of a correlation marking on the film in a sensing position can be used to signal the existence of correlation whereas the absence of such marking may energize a warning lamp or deactivate the film drive.
Claims10
A method of checking the correlation of two independently driven data carriers to be run at the same time, comprising the steps of:
- providing a first data carrier with a code mark detectable in an early phase of its run;
- providing a second data carrier with correlation and non-correlation markings detectable in an early phase of its run with one mode of operation but nondetectable with another mode of operation;
- starting the run of both data carriers substantially concurrently, with said second data carrier in its other mode of operation preventing detection of either of said markings thereon;
- upon detecting said code mark on said first data carrier, switching said second data carrier to said one mode of operation for detecting the markings thereon;
- and
- continuing the run of said data carriers only upon detection of a correlation marking on said second data carrier immediately after switching to said one mode of operation.
A system for checking the correlation of two independently driven data carriers to be run at the same time, comprising;
- first reading means for a first data carrier bearing a code mark;
- first drive means for moving said first data carrier past said first reading means;
- second reading means for a second data carrier bearing a correlation marking;
- second drive means for moving said second data carrier past said second reading means, said second drive means being switchable between a normal mode and an alternate mode of operation, said correlation marking being detectable by said second reading means only in said alternate mode of operation;
- control means connected to said first reading means for switching said second drive means from said normal mode to said alternate mode of operation upon detection of said code mark on said first data carrier during simultaneous operation of said first and second drive means;
- and
- evaluation means controlled by said second reading means for indicating a correlation between said first and second data carriers in response to detection of said correlation marking upon switchover to said alternate mode of operation.
A system for checking the correlation of a sound-recording tape and a motion-picture film to be run at the same time, comprising:
- sound-reproducing means provided with first drive means for advancing a tape bearing a code mark;
- projection means provided with second drive means for advancing a film bearing a correlation marking;
- reading means in said sound-reproducing means for detecting said code mark;
- a light source in said projection means connected to said reading means for energization upon detection of said code mark;
- photoelectric sensing means juxtaposed with said light source in said projection means along the path of said film for detecting said correlation marking in the energized condition of said light source;
- and
- coincidence means connected to said sensing means and to said reading means for indicating lack of correlation between said tape and said film in the absence of an output signal from said sensing means upon detection of said code mark.
Dependencies are inferred from the claim text.