use filter function with digitalFilter object created with highPass fucntion

Hi,

I'm creating digitalFilter object using the highpass fucntion.

The result signal of the highpass function looks quite good and how I expected it to be.

Then, I'm trying to use the filter funciton with the digitalFilter object created with the highpass fucntion.

I'm getting different results - for the filter fucntion with the digital filtter object, I'm getting pulling down of the signal for short periods of time.

i.e. - the signal_1 (blue) and signal_2 (yellow) results of the following 2 lines should be the same (but they are not).

The wanted outcome is signal 1.

Any Idea what is the issue would be greatly appreciated.

Omri

[signal_1 fhp] = highpass(inputSignal,0.125,fs,'Steepness',0.5,'StopbandAttenuation',20);
singal_2 = filter(fhp,inputSignal);

The rerulted fhp is the following: