Patent ID: 7218834
Filing Date: 2007-05-15
Classification: H04N

Abstract:
1. An apparatus for recording and playing back monitored video data, which can record video data for a long time, comprising: first memory means for storing video data temporarily; first recording and playing back means for recording and playing back output data from said first memory means in a recording medium; second memory means for storing playback data from said first recording & playback means temporarily; and second recording and playing back means for recording data output from said second memory means on a magnetic tape by forming oblique tracks on said magnetic tape, controlling means for controlling the operations of writing and reading of said first and second memory means and recording and playback operations of said first and second recording and playback means, said controlling means further includes the steps of; controlling so that reading video data from said first memory means and recording by said first recording & playback means are repeated each time the first specified data amount is reached in a recording operation, executing playback operation of said first recording & playback means and recording operation of said second recording & playback means in first operation mode so that those operations are stopped until the data recorded by said first recording & playback means and not played back yet reaches second specified data amount which is greater than said first specified data amount, and setting second operation mode so that recording and playback operations of said first recording & playback means are time-shared until data of said second specified data amount is played back completely, when said data recorded and not played back yet reaches said second specified data amount, and executing the recording of the data read by said second memory means at a specified transfer speed in second operation mode in which recording by said second recording & playback means is performed while feeding the magnetic tape continuously by forming tracks obliquely on said magnetic tape.