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ADC vocabulary question

  1. Mar 12, 2012 #1
    what do you call the digital number that analog to digital converters output ?

    Does it make any sense to call it "analog signal's digital representation" ? Is there a better way to call it?
     
  2. jcsd
  3. Mar 12, 2012 #2

    davenn

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    Its called a binary output

    the number of bits, from the LSB (Least Significant Bit to the MSB Most Significant Bit) that binary code has for each sample is a function of the design of the ADC chip ie. whether its a for example a 8 bit, 16 bit or say 24bit system.
    the more bits the higher the resolution and the larger the input signal it can handle befor it clips. For example, an ADC with a resolution of 8 bits can encode an analog input to one in 256 different levels, since 28 = 256.

    Initially my digital seismograph system used 12bit resolution (4094 datapoints) and it would often clip on the large signals from the big earthquakes. I upgraded the ADC system to a 16bit one now I have 65536 datapoints.

    hope that waffle helped :)

    Dave
     
  4. Mar 12, 2012 #3

    sophiecentaur

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    It doesn't need to be binary. The general term would be 'digital' or even 'quantised' output.

    The term "representation" is a good one because it gets over the idea that it's information that's involved.
     
  5. Mar 12, 2012 #4

    jim hardy

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    Indeed, while one will most often encounter a binary representation it may be in any of several formats.
    Once ran across one that gave result as an ASCII character string representing the millivolts, complete with decimal point .

    Never saw one that gave Roman Numerals, though.
     
  6. Mar 12, 2012 #5

    sophiecentaur

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    And BCD was popular, too.
    Jim - your eyes are beginning to mist over again. . . .
     
  7. Mar 12, 2012 #6
    Digitized Signal
     
  8. Mar 12, 2012 #7

    jim hardy

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    .

    You know, they just don't make nostalgia like they used to. :approve:
    old jim
     
  9. Mar 13, 2012 #8

    davenn

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    ASCII never come across one with an ASCII output

    we learn every day :)

    Dave
     
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