Signal receiver
First Claim
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1. 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.
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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.
11 Citations
12 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6)
- means to determine digitally a confidence characteristic for the modulation state of a symbol within a FSK modulated signal at a carrier frequency;
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7. 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.- View Dependent Claims (8, 9, 10, 11, 12)
Specification