參數(shù)資料
型號： AD1954YS
廠商： ANALOG DEVICES INC
元件分類： 消費家電
英文描述： RESISTOR
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝： MO-112AB, MQFP-44
文件頁數(shù)： 32/36頁
文件大?。?/td> 1470K
代理商： AD1954YS
AD1954
–32–
APPENDIX
Cookbook Formulae for Audio EQ Biquad Coefficients
(Adapted from Robert Bristow-Johnson’s Internet Posting)
For designing a parametric EQ, follow the steps below.
1. Given:
Frequency
Q
dB_Gain
Sample_Rate
2. Compute intermediate variables:
A = 10
(dB_Gain/40)
= 2
  
Frequency/Sample_Rate
sn = sin(
)
cs = cos(
)
= sn/(2
Q)
3. Compute coefficients:
b0 = ( 1 + A
 
)/( 1 + (
/A))
b1 = –2
cs/( 1 + (
/A))
b2 = (1 – (
 
A))/(1 + (
/A))
a1 = 2
cs/(1 + (
/A)) = –b1
a2 = –( 1 – (
/A))/( 1 + (
/A))
4. The transfer function implemented by the AD1954 is given by:
H(Z) = (b0 + b1
Z – 1 + b2
Z – 2)/
(1 – a1
Z – 1 – a2
Z – 2)
Note the inversion in sign of a1 and a2 relative to the more
stan dard form. This form is used in this document because
the AD1954 implements the difference equation using the
formula below.
Y(n) = a1
y(n – 1) + a2
y(n – 2) + b0
x(n)
+ b1
x(n – 1) + b2
x(n – 2)
REV. A
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