Analog to digital conversion[edit]
Description[edit]
The ADC generates a pulse stream in which the frequency of pulses in the stream is proportional to the analog voltage input, , so that the frequency, where k is a constant for the particular implementation.
A counter sums the number of pulses that occur in a predetermined period, so that the sum, , is .
is chosen so that a digital display of the count, , is a display of with a predetermined scaling factor. Because may take any designed value it may be made large enough to give any desired resolution or accuracy.
Each pulse is made up of a step up followed after a short interval by a step down. It is possible, even in the presence of electronic noise, to recover the timing of these steps and from that regenerate the transmitted pulse stream almost noiselessly. Then the accuracy of the transmission process reduces to the accuracy with which the transmitted pulse stream represents the input waveform.
Analog to digital conversion[edit]Description[edit]The ADC generates a pulse stream in which the frequency of pulses in the stream is proportional to the analog voltage input, , so that the frequency, where k is a constant for the particular implementation.A counter sums the number of pulses that occur in a predetermined period, so that the sum, , is . is chosen so that a digital display of the count, , is a display of with a predetermined scaling factor. Because may take any designed value it may be made large enough to give any desired resolution or accuracy.Each pulse is made up of a step up followed after a short interval by a step down. It is possible, even in the presence of electronic noise, to recover the timing of these steps and from that regenerate the transmitted pulse stream almost noiselessly. Then the accuracy of the transmission process reduces to the accuracy with which the transmitted pulse stream represents the input waveform.
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