Memory trick

By Barry Fox Video surveillance tapes run for many hours, but gaps in the coverage inevitably appear when the tape is changed or rewound. Mitsubishi bridges the gap by automatically recording onto memory chips during the interruption (GB 2 342 760). The machine senses when the tape is coming to an end, and dumps the signals into its memory. When the tape is ready to start recording again, the memory transfers its stored images onto the tape at slightly higher than normal speed. When the memory empties,
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