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FPGA based BFSK demodulator

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Vonn

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bfsk demodulator fpga

i have built it !
 

Vonn

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I have impelemented a counter to count the zero crossing in order to know the no. of clocks relative to the mark and space frequency ... but the problem is the symbol frequency doesn't start from the same phase each time so what can i do to over come this problem
 

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