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PDM also refered to as pulse width modulation (PWM)...here the samples of mes signals are used to vary the duration of the individual pulse in the carrier...
Added after 7 minutes:
pulse could only refer to 1's...
infact i wonder how can there be 1's and 0's in PDM...
75% may refer to the amount of time for which pulse is on in a given interval of time...
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