Method and apparatus for digital cordless telephony
US6144853A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1997 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Jul 10, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/04
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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 antenn…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.