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delta sigma modulation problem

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itmr

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hi
i work with ADMP421 mems microphone
i clocekd this device frommy FPGA and pass the samples throught FTDI chip to pc and then to matlab to demoduate the samples.
when i analyzed the samples i didnt get the wanted frequency ( after fft)
couldsome one help me?
mybe my matlab file failed?
does somone have matlab file to analyze sigma delta samples?
i will be very happy to any debuging idea...
thank a lot
 

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