From the magnitude frequency response of a low pass filter, we can state that the region after stop band frequency is known as ‘stop band’ where the signal is stopped or restricted.

If 1-δP is the pass band attenuation, then the pass band gain is given by the formula 20log(1-δP).

1-δP is known as the pass band ripple or the pass band attenuation, and its value in dB is given as -20log(1-δP).

From the magnitude frequency response of the low pass filter, the hatched region in the stop band indicate forbidden magnitude value whose value is given as

δS is known as the stop band attenuation, and its value in dB is given as -20log(δS).

If δS is the stop band attenuation, then the stop band gain is given by the formula 20log(δS).

From the magnitude frequency response of a low pass filter, we can state that the region before pass band frequency is known as ‘pass band’ where the signal is passed without huge losses.

From the magnitude frequency response of the low pass filter, the hatched region in the pass band indicate forbidden magnitude value whose value is given as

A filter is said to be normalized if the cutoff frequency of the filter, Ωc is 1 rad/sec.

From the magnitude frequency response of a low pass filter, we can state that the region between pass band and stop band frequencies is known as ‘transition band’ where no specifications are provided.