Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2011-06-28
2011-06-28
Ha, Dac V (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S140000, C375S147000
Reexamination Certificate
active
07970042
ABSTRACT:
A spread spectrum clock generator (SSCG) control and inspection circuit provides a system and method for inspecting and controlling an external SSCG, and for verifying the modulation profile waveform of an external SSCG. An electronic circuit is included that can check for the presence of an optimal SSCG modulation profile in product subsystems, and in attached modular systems, including electronic plug-in features such as internal network adapters and cartridges. In one mode of the invention, an electronic circuit ensures continued radiated emissions compliance for field replaceable units or consumable parts within a product, such as a printer, a scanner, or a combination (or all-in-one) printer/scanner. In another mode of the invention, an electronic circuit may also act as a secondary security device for consumable products, such as toner cartridges or ink jet cartridges. In yet another mode of the invention, an electronic circuit may also adjust the attached SSCG clock.
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Hardin Keith Bryan
Oglesbee Robert Aaron
File Erin M
Ha Dac V
Lexmark International Inc.
Pezdek John Victor
Tromp Justin M.
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