Electrical computers and digital processing systems: support – Clock – pulse – or timing signal generation or analysis
Reexamination Certificate
2011-07-12
2011-07-12
Tran, Vincent T (Department: 2116)
Electrical computers and digital processing systems: support
Clock, pulse, or timing signal generation or analysis
C713S168000, C713S178000, C725S080000, C726S026000, C726S029000
Reexamination Certificate
active
07979731
ABSTRACT:
A time authentication device identifies clocks that show a time falling within the predetermined permissible range as compared with a time shown by the time authentication device. In a time authentication device embodied as a distribution device, a time-relation information storage unit stores a playback-device-time measured by a clock unit of a playback device, and also stores a distribution-device-time measured by a clock unit when the playback-device-time is acquired. The time authentication unit acquires from the playback device a target time measured by the clock unit, and also acquires an authentication time measured by the clock unit when the target time is received. The time authentication unit then calculates a first difference, a second difference, an authentication difference. If the authentication difference is smaller than or equal to a predetermined threshold, the time authentication unit judges that the clock unit of the playback device is valid.
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Futa Yuichi
Matsuzaki Natsume
Nakano Toshihisa
Yamauchi Hiroki
Kinsey Brandon
Panasonic Corporation
Tran Vincent T
Wenderoth , Lind & Ponack, L.L.P.
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