Device and method for reproducing photographic sound recordings
AssigneeThomson Licensing
InventorsDieter Poetsch, Detlef Richter, Jochen Huegel
Life of this patent
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Abstract
For a reproduction of optical sound information in a double variable-area track (DZ) an optoelectronic converter device scans the optical sound track of a film. The converter device generates a digital image signal for buffer storage in the memory of a program-controlled data processing device. The data processing device derives the profile of the two edges of the double variable-area track from data values of the buffer-stored image signal. Audio data for a sound reproduction are generated using data about the edge profile determined.
Claims17
Apparatus for the reproduction of optical sound recordings, which has an optoelectronic converter device for the optical scanning of an optical sound track, which outputs a digital image signal of the scanned optical sound track at an output, and which contains a device for buffer-storing the image signal output by the converter device, comprising:
- a device for the program-controlled data processing of the buffer-stored image signal, which firstly determines the profile of edges of a variable-area track from data values of the image signal and which then generates audio data for a sound reproduction from data of the edge profile determined, wherein, in order to define the edge profile of a variable-area track, the data processing device can be controlled by a program in such a way that the position of sudden brightness changes within a scanning line is determined by evaluation of the distribution of data values of the pixels, representing brightness values.
Method for the reproduction of optical sound recordings, comprising:
- generating a digital image signal by scanning an optical sound track,
- buffer-storing data of the image signal generated,
- determining an edge profile of a variable-area track recorded on the optical sound track in a manner dependent on values of the buffer-stored data, and
- deriving corresponding audio data for a sound reproduction in a manner dependent on the edge profile determined,
- wherein, in order to define the edge profile of a variable-area track, the position of sudden brightness changes within a scanning line is determined by evaluation of the distribution of data values of pixels, representing brightness values.
Dependencies are inferred from the claim text.