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Converting analog data (signals) to digital data (signals)

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• Transmitting analog data using digital signals
  • Analog (input) data:

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  • Digital signals:

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  • Problem Description:

    How do we convert this: into this:

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• Sampling
  • Sampling:

    Measure (and record) a continuous signal at regular intervals

    Example:

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• Converting analog data (signal) to digital data (signal)
  • How to transmit analog data using discrete signals

    The analog data is first sampled into serie of numerical values Example: Each of the numerical value is encoded into a binary number and transmitted using (binary) digital signals:

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• A/D converters
  • A/D converter (chip):

    A/D converter = the device (chip) that converts (samples) analog signals to digital signals Wikipedia page: click here

    You can specify a sampling rate:

    The more frequent you sample the input signal, the better accurate the approximation !!!

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  • Caveat:

    If you sample below a certain threshold, you may not be able to reconstruct the original signal using the sampled values !!!

    First, let's look at how you re-construct the original signal from the samples