discrete signals

Discussion in 'Homework Help' started by bhuvanesh, Feb 16, 2015.

  1. bhuvanesh

    Thread Starter Member

    Aug 10, 2013
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    my professor said that everything in nature is on continuous time domain (continuous signal) and there is no discrete signals. i too know that do you have any idea that why discrete signal are not in nature .i am expecting geeky answers about this.Thank you
     
  2. WBahn

    Moderator

    Mar 31, 2012
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    Your professor is wrong -- but only in the fine print. Some things in nature are inherently discrete (quantized). How much charge an object has is an integer multiple of the charge on an electron (subatomic particles notwithstanding, which are still quantized). But on a macro scale, the quantization of things is so fine that it might as well be continuous. Other things are inherently continuous, such as distance or time (although some physical theories postulate quanta for these, too).
     
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  3. MrChips

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    Oct 2, 2009
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    Your professor is right and wrong.

    I made the statement in another thread that all digital signals are analog.
    What both your professor and I are referring to are electrical signals such as current or voltage.

    Of course you can find many things in nature that are discrete.
     
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  4. bhuvanesh

    Thread Starter Member

    Aug 10, 2013
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    what i am asking is about discrete signals not digital signal.

    could some give me example for discrete signals and digital signals?
     
  5. bertus

    Administrator

    Apr 5, 2008
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  6. MrChips

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    Any kind of detector than detects the presence of particles such as alpha, beta, gamma rays or photons will produce a discrete signal.
     
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  7. MrChips

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    Oct 2, 2009
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  8. bhuvanesh

    Thread Starter Member

    Aug 10, 2013
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    @bertus
    This is one of reply to the question i am just quoting the lines from the above paragraph that i feel wrong

    quantisation can only be done after sampling,right?

    he is saying in reverse,what i feel right is all digital signals are discrete signal ,is that right?
     
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