Signal receiver
AssigneeEMI Limited
InventorClive R. Weston
Life of this patent
Estimating the term…
Abstract
A receiver for the demodulation of FSK signal for passage to ancillary equipment has an error-corrector prior to demodulator. In preparing received signals for error-correction, they are passed to a counter which notes the number of cycles within each symbol of the signal. Thereafter, this count is used by a calculator and a classifier to derive a confidence level indicating the degree of certainty of the symbol having the carrier frequency. This confidence level is used in the error-correcting and/or demodulation operations.
Claims12
Equipment for the processing of FSK modulated signals at a carrier frequency and formed of a plurality of symbols, the equipment comprising:
- means to determine digitally a confidence characteristic for the modulation state of a symbol within a FSK modulated signal at a carrier frequency;
- means to error-correct the signal in accordance with the output of the confidence-determining means;
- and means to demodulate a received signal as output from the error-correcting means.
A method of processing FSK-modulated signals at a carrier frequency and formed of a plurality of symbols, the method comprising:
- determining digitially a confidence characteristic for the modulation state of a symbol within a received signal;
- error-correcting the signal in accordance with the determined confidence characteristics;
- and demodulating the resultant signal.
Dependencies are inferred from the claim text.