| http://www.w3.org/ns/prov#value | - us, where L, M and N each is an integer greater than or equal to 1, wherein a period for the compressed video signal which is output from the compression means is set to be longer than time T. where the time T is defined as a sum of seek time required for moving the magnetic head to write the compressed video writing signal onto the hard disk apparatus, time required for writing the compressed vid
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