Data slicer for demodulated binary FSK signals in a time division duplex radio environment
US5933455A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 1997 |
| Grant date | Aug 3, 1999 |
| Priority date | — |
| Expiry date | May 28, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/142
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for providing a FSK data slicer for use in wireless telecommunications such as cordless telephones. The FSK data slicer is used by a receiver circuit in a wireless telecommunication device for converting an analog data signal to a digital data signal. Furthermore, the FSK data slicer responds to different mode of the analog data signal. The FSK data slicer includes a low-pass filter, a controller, a comparator, and an integrator. The low-pass filter receives the analog data signal for generating a median voltage, or slice voltage. Furthermore, the low-pass filter includes connectors to allow an external resistor to be serially connected between the filter input and the analog data signal and to allow an external capacitor to be connected in parallel with the slice voltage at the filter output. The bandwidth of the low-pass filter is controlled by the controller. The controller responds to specific intervals of the TDD frames, initial acquisition of data in the analog data signal, and known characteristics of the TDD frames and adjusts the low-pass filter bandwidth, accordingly. As a result, the low-pass filter drives the slice voltage only when it can do so acc…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.