Telecommunications – Transmitter – Angle modulation
Reexamination Certificate
2007-06-12
2007-06-12
Vuong, Quochien B. (Department: 2618)
Telecommunications
Transmitter
Angle modulation
C375S132000, C375S303000
Reexamination Certificate
active
10628815
ABSTRACT:
A receiver front end (302) receives a known Stop Waveform (114) comprising a predetermined symbol pattern on a voice channel, the Stop Waveform sent at the end of a transmission. A processor (304) coupled to the receiver front end terminates (512) the reception of the voice channel in response to detecting the Stop Waveform. The processor computes (504) a plurality of characteristics derived from the received signal, including a carrier-to-noise ratio, a maximum normalized symbol correlation energy over all symbols of the Stop Waveform, and a number of small and a number of large normalized symbol energy values. The processor detects (506) the Stop Waveform by comparing the plurality of characteristics with a corresponding plurality of predetermined thresholds.
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