Filter resists to frequency change

[buark]

hi,
is there a common name for a filter which resists to frequency change (change in time domain)?
for example;
Signal generator outputs Sin(2pi*t*f1) then if it changes to Sin(2pi*t*f2) , output of the filter shall smooth the frequency change from f1 to f2 in time domain.

I am a newbee in this topic,
thanks

 

[FvM]

If the term filter refers to a linear, time-invariant signal processing system (the usual understanding, I think), a filter can't do this, I believe. Of course a linear filter will "smooth" an abrupt change of frequency, but not result in a montone varying frequency with constant magnitude.

The best way to implement a smooth change with programmable transition time is probably a PLL.

 

[buark]

From FvMs command I understand that Filter is a wrong name for this function.
So let me put it like this :
is there a function which response to frequency jumps in time domain and smooths this frequency transition (like a low pass filter in time amplitude space)
thanks

 

[BradtheRad]

To use musician's terminology, you're asking if a glissando effect can be achieved in an electronic circuit.

An AC motor might qualify. Its rpm makes a smooth transition to a sudden frequency change.

However I've never seen a circuit that gives that sort of response.