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US 7,680,961 B2Granted
Device recognition system and method
AssigneeHewlett-Packard Development Company, L.P.
InventorLee Atkinson
Life of this patent
Estimating the term…
Abstract
A device recognition system comprises an identification module of a computer device configured to generate an impedance signature for an external device using an impedance of the external device measured at least two different stimuli, the impedance signature used to identify the external device.
Claims32
A device recognition system, comprising:
- an identification module of a computer device configured to:
- determine whether a direct current (DC) resistance is present at an I/O port to which an external device is connected;
- if the DC resistance is present, apply a DC voltage stimulus to the external device or if the DC resistance does not meet a predetermined level, apply an AC frequency stimulus to the external device;
- and
- generate an impedance signature for the external device using an impedance of the external device measured after applying the DC voltage stimulus or the AC frequency stimulus, the impedance signature used to identify the external device.
2 more elements
A device recognition method, comprising:
- determining whether a direct current (DC) resistance is present at an I/O port to which an external device is connected;
- if the DC resistance is present, applying a DC voltage stimulus to the external device or if the DC resistance does not meet a predetermined level, applying an AC frequency stimulus to the external device;
- and
- generating an impedance signature for the external device using an impedance of the external device measured after applying the DC voltage stimulus or the AC frequency stimulus where the impedance signature is used to identify the external device by a computer device.
1 more element
A device recognition system, comprising:
- means for determining whether a direct current (DC) resistance is present at an I/O port to which an external device is connected;
- means for applying a DC voltage stimulus to the external device if the DC resistance is present, and applying an AC frequency stimulus to the external device if the DC resistance does not meet a predetermined value;
- and
- means for generating an impedance signature for the external device using an impedance of the external device measured after applying the DC voltage stimulus or the AC frequency stimulus, the impedance signature used to identify the external device by a computer device using an impedance signature associated with the external device stored in a database.
1 more element
A device recognition system, comprising:
- an identification module of a computer device configured to:
- determine whether a direct current (DC) resistance is present at an I/O port to which an external device is connected;
- if the DC resistance is present, apply at least two different DC voltage stimuli to the external device, or if the DC resistance does not meet a predetermined level, apply at least two different AC frequency stimuli to the external device;
- and
- use the at least two different DC voltage stimuli or the at least two different AC frequency stimuli in measuring an impedance of the external device coupled to the computer device, the identification module configured to receive from a user identification information for the external device.
2 more elements
Dependencies are inferred from the claim text.