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US 4,786,988 AGranted
Method and device for recording control signals for high-speed contact printing
AssigneeSony Corporation
InventorToshiharu Kobayashi
Life of this patent
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AssigneeSony Corporation
InventorToshiharu Kobayashi
Estimating the term…
A mother tape is adapted to perform magnetic or thermal high-speed contact printing for duplicating video data or information to be reproduced in a VTR monitor with eliminating spike noise otherwise contained in the reproduced control signal. The mother tape stores video information including control signals. The control signals have a waveform which has a first level immediately following the leading edge and lower than a second level corresponding to the normal high level, and a third level immediately following the trailing edge and higher than a fourth constant level corresponding to the normal low level. The first- and third-level waveform "buffers" thus created tend to suppress the spike noise conventionally occurring at the leading and trailing edges of the reproduced control signal and ensure more reliable tracking, tape speed control and so forth.
A sub-master tape for high-speed contact printing for duplicating video information onto a slave tape, characterized by video information copied from a master tape and including a control signal which is made up of rectangular pulses of alternating upper and lower peak levels, each pulse having respective leading and trailing edges, said control signal having a first level immediately following the leading edge of each pulse of the control signal, a second level immediately following said first level and corresponding to said upper peak level of said control signal pulses, said second level being higher than said first level, a third level immediately following the trailing edge of each pulse of the control signal, and a fourth level immediately following said third level and corresponding to said lower peak level of said control signal pulses, said fourth level being lower than said third level.
A method for recording a control signal on a sub-master tape for high-speed contact printing for duplicating video information including said control signal onto a slave tape, which control signal is of pulse form having alternating first upper and second lower levels, each pulse having a respective leading edge and a trailing edge, characterized by providing a third level lower than said first upper level immediately following the leading edge of each control signal pulse and before said first level, and providing a fourth level higher than said second lower level immediately following the trailing edge of each control signal pulse and before said second level.
A device for recording a control signal on a sub-master tape used in high-speed contact printing for duplicating video tape recorder signal data including control signal data onto a slave tape, comprising:
Dependencies are inferred from the claim text.