anchor sound in mushra

hi

I want produce anchor from target sound, how can do it?

The standard anchor is a low-pass filtered version of the original signal with a cut-off frequency of 3.5 kHz;

in mushra mention anchor made bellow instruction.

. The standard anchor is a low-pass filtered version of the original signal with a cut-off frequency of 3.5 kHz; The characteristics of the 3.5 kHz low-pass filter should be as follows: fc = 3.5 kHz Maximum pass band ripple = ±0.1 dB Minimum attenuation at 4 kHz = 25 dB Minimum attenuation at 4.5 kHz = 50 dB. how can effect Minimum attenuation at 4.5 kH z and Minimum attenuation at 4 kHz and Maximum pass band ripple ?