Filter approx output given input

johnd909

Joined Mar 13, 2016
1
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.

Papabravo

Joined Feb 24, 2006
14,869
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.

AnalogKid

Joined Aug 1, 2013
8,820
If you are asking what the attenuation of the filter is, we kinda sorta NEED the frequency of interest.

ak

WBahn

Joined Mar 31, 2012
26,398
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.

crutschow

Joined Mar 14, 2008
26,053
0dB is the attenuation of a solid piece of zero resistance wire.

WBahn

Joined Mar 31, 2012
26,398
0dB is the attenuation of a solid piece of zero resistance wire.
Although stranded zero resistance wire can come pretty close.