Apparatus for marking a recorded signal
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United States of America Patent
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-
Oct 16, 1990
Grant Date -
N/A
app pub date -
Apr 20, 1989
filing date -
Apr 20, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention relates to apparatus for marking a recorded signal. The apparatus includes means for generating and storing a marking signal comprising at least two codes which are mutually in phase quadrature. The codes are converted to analogue signal and are used to phase-shift modulate the signal to be recorded, the modulating means performing the function of a single side band modulator on the signal to be recorded.
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