Patent ID: 6483984
Filing Date: 2002-11-19
Classification: G11B,H04N

Abstract:
A magnetic recording-reproduction device wherein a control signal is recorded on a control track of a magnetic tape to thereby control the tape speed and phase for the reproduction of video signals, the device comprising a CTL signal recording circuit for recording the control signal on the magnetic tape, a CTL duty setting circuit for setting a variable duty ratio for the control signal, a CTL signal reproduction circuit for reproducing the control signal recorded on the magnetic tape, a CTL duty identification circuit for identifying the duty ratio of the reproduced control signal, and a system control circuit for controlling the operation of the device, the system control circuit comprising:first control means for decoding magnetic tape management information superposed on the control signal based on the result of identifying the duty ratio by the CTL duty identification circuit when a command is given to record video signals and controlling validation/invalidation of the command according to the result of decoding, and second control means for commanding the CTL duty setting circuit to vary the duty ratio to superpose magnetic tape management information on the control signal when video signals are to be recorded.