a
0
= 1 + alpha/A;
a
1
= –2* cos ;
a
2
= 1 – alpha/A
High Shelf Filtr. Bu filtr hisoblashda ko`rsatilgan
chastotadan baland chastota
kengligini qoldiradi. Koeffitsientlar quyidagicha hisoblanadi.
b
0
=
A*[ (A+1) + (A-1)*cos + sin*beta ];
b
1
=
–2* A*[ (A-1) + (A+1)*cos ];
b
2
=
A*[ (A+1) + (A-1)*cos - sin*beta ];
a
0
=
(A+1) – (A-1)*cos + sin*beta;
a
1
=
2* [ (A-1) – (A+1)*cos ];
a
2
=
(A+1) – (A-1)*cos - sin*beta;
Nomalum koeffitsientlarni hisoblash:
A = 10
dBgain/40
;
omega = 2*pi*w/w
dis
sin = sin(omega);
cos = cos(omega);
alpha = sin/(2*Q) ;
beta = √𝐴𝐴 + 𝐴𝐴;
bu
yerda
dBgain – EQF, LSF va HSF filtrlarida foydalaniladi;
w – berilgan
chastota;
w
dis
– diskretlash chastotasi;
Q – sifat omili;