Telecommunications – Transmitter and receiver at separate stations – Single message via plural carrier wave transmission
Patent
1995-02-28
1997-02-11
Pham, Chi H.
Telecommunications
Transmitter and receiver at separate stations
Single message via plural carrier wave transmission
455 45, 455 541, 455 671, 4552262, 455102, 34082544, H04B 104, H04B 116, H04B 1700
Patent
active
056030886
ABSTRACT:
A radio transmitter (103) transmits a cycle (320) including a digital portion (330) generated by frequency modulating a radio carrier with a digital signal and an analog portion (440) generated by amplitude modulating a radio carrier with an analog signal. A selective call radio (106) frequency demodulates the digital signal; amplitude demodulates the analog signal; decodes a message address (510); generates a quality signal indication (643) while a quality assessment signal (420) is being received; processes an information signal (550) in response to a message received signal (641); records at least one measurement of the quality assessment signal (420) during the quality signal indication (643); determines a signal quality level of the information signal (550) from the at least one measurement of the quality assessment signal (420); and generates a sensible alert in response to the signal quality level.
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"An Overlap-Add Technique Based on Waveform Similarity (WSOLA) for High Quality Time-Scale Modification of Speech" by Werner Verhelst & Marc Roelands, 1993 IEEE, pp. II-554-II-557.
Gorday Paul E.
Sunil Satyamurti
Lamb James A.
Motorola Inc.
Pham Chi H.
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