Dale E Nelson

US Patent:

61448532, Nov 7, 2000

Filed:

Jul 10, 1997

Appl. No.:

8/891007

Inventors:

Thomas A. Gentles - Arlington Heights IL
Jeffrey Paul Grundvig - Macungie PA
Rajeev Krishnamoorthy - Middletown NJ
Pamela Kwong - Whitehall PA
Dale Harvey Nelson - Shillington PA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04Q 700

US Classification:

455426

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.