Pulse or digital communications – Transceivers – Modems
Reexamination Certificate
2005-01-04
2005-01-04
Chin, Stephen (Department: 2734)
Pulse or digital communications
Transceivers
Modems
C375S220000
Reexamination Certificate
active
06839382
ABSTRACT:
Digital impairments, including Robbed Bit Signaling (RBS) and impairments due to digital attenuation PAD (Packet Assembler/Disassembler) devices, may be identified in sets of Pulse Code Modulation (PCM) signal levels, such as sets of Digital Impairment Learning (DIL) signals transmitted from a server modem to a client modem during a plurality of DIL levels. Both signature analysis and signal level comparison analysis are preformed on the signals to identify digital impairments. Signature analysis compresses the set of signal levels into a signature. Digital impairments are determined based on the signature. In a preferred embodiment, the PCM signal levels are compressed into a signature by identifying clusters and/or skips. PCM signal level comparison analysis uses differences, between PCM signals and models of signals having various digital impairments. By using both techniques combination, the strengths of each technique are utilized while the weaknesses of each techniques are avoided.
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Davis Gordon Taylor
Dholakia Ajay
Hwang Dongming
Ware Malcolm Scott
Ye Hua
Chin Stephen
Myers Bigel Sibley & Sajovec P.A.
Williams Lawrence
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