Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1997-07-10
2000-11-07
Kuntz, Curtis A.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455413, 455462, 455465, 375245, 704230, H04Q 700
Patent
active
061448532
ABSTRACT:
A method of transmitting a voice communications signal includes the steps of sampling the signal and creating digital representations of the samples. The digital representations are speech-coded to create speech-coded data which is converted to analog symbols. A carrier in the 46-49 MHz band is modulated by the analog symbols and transmitted. A method of receiving a voice communications signal includes the steps of receiving a modulated carrier in the 46-49 MHz band and demodulating the modulated carrier to recover analog symbols. The analog symbols are converted to digital samples, which are then converted to speech-coded data. The speech-coded data are decoded to produce digitized samples, which are converted to analog samples and filtered to produce the voice communications signal. A cordless telephone system according to the invention includes a handset and a base unit. The handset includes a microphone, a speaker, a first digital signal processor connected to the microphone and to the speaker, a first 46-49 MHz RF transceiver connected to the first digital signal processor, and a first antenna connected to the first 46-49 MHz transceiver. The base unit includes a second antenna, a second 46-49 MHz RF transceiver connected to the second antenna, a memory, and a second digital signal processor connected to the second 46-49 MHz RF transceiver, to the memory, and to a telephone line interface.
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Gentles Thomas A.
Grundvig Jeffrey Paul
Krishnamoorthy Rajeev
Kwong Pamela
Nelson Dale Harvey
Kuntz Curtis A.
Lucent Technologies - Inc.
Tieu Binh K.
Veschi John P.
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