Pulse or digital communications – Spread spectrum
Reexamination Certificate
2007-10-02
2010-02-02
Tran, Khanh C (Department: 2611)
Pulse or digital communications
Spread spectrum
C380S201000
Reexamination Certificate
active
07656930
ABSTRACT:
The disclosure details methods of measuring the quality of service of received media signals by analyzing digital watermarks embedded in such signals. The quality of a received video or audio signal can thereby be assessed without having the original version of the signal before transmission. Instead, the strength or quality of the embedded digital watermark is analyzed to determine the quality of the received signal. The degradation of a watermark signal is used to assess quality of service of signals, such as audio and video.
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Brunk Hugh L.
Levy Kenneth L.
Tian Jun
Digimarc Corporation
Tran Khanh C
LandOfFree
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