limits the low frequency response.

limits the high frequency response.

does not affect the frequency response.

blocks the d.c. components without effecting the frequency response.

improves the signal to noise ratio at the i/p.

improves the signal to noise ratio at the o/p.

does not effect the signal to noise ratio at the o/p.

Reduces distortion

there is no d.c present in the o/p.

there is no distortion in the o/p.

there is no even harmonics in the o/p.

there is no odd harmonics in the o/p.