Filter approx output given input

Discussion in 'General Electronics Chat' started by johnd909, Mar 13, 2016.

  1. johnd909

    Thread Starter New Member

    Mar 13, 2016
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    0
    Given the input Filter function, u = sin(2 π [50Hz] t) + sin(2π{50000Hz} t)
    What is the approx output?

    At a first glance I think the output is 0 DB.
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,164
    1,797
    I'm not sure what a filter function refers to. To measure something using dB you have to compare two things. If they are the same then 0 dB is the way to describe that relationship.
     
  3. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,546
    1,252
    If you are asking what the attenuation of the filter is, we kinda sorta NEED the frequency of interest.

    ak
     
  4. WBahn

    Moderator

    Mar 31, 2012
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    When I think of a time-domain "filter function" I think of the impulse response of the filter. If that's what you mean, then you are describing a filter that, when hit with an impulse, rings at two perfect frequencies with no transient. That doesn't make sense.

    Please describe what YOU mean by "filter function" more explicitly -- it might just be a matter of different terminology.
     
  5. crutschow

    Expert

    Mar 14, 2008
    13,052
    3,244
    0dB is the attenuation of a solid piece of zero resistance wire. ;)
     
  6. WBahn

    Moderator

    Mar 31, 2012
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    Although stranded zero resistance wire can come pretty close. :D
     
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