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
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1,850
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
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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
18,087
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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
13,498
3,374
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.