參數(shù)資料
型號(hào): AD1953
廠商: Analog Devices, Inc.
元件分類: 數(shù)字信號(hào)處理
英文描述: 16-bit fixed point DSP with Flash
中文描述: 具有閃存的 16 位定點(diǎn) DSP
文件頁(yè)數(shù): 33/36頁(yè)
文件大?。?/td> 750K
代理商: AD1953
REV. 0
AD1953
–33–
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)
omega = 2
×
π
×
Frequency/Sample_Rate
sn = sin(omega)
cs = cos(omega)
alpha = sn/(2
×
Q)
3. Compute Coefficients
b0 = (1 + A
×
alpha)/(1 + (alpha/A))
b1 = –2
×
cs/(1 + (alpha/A))
b2 = (1 – (alpha/A))/(1 + (alpha/A))
a1 = 2
×
cs/(1 + (alpha/A)) = –b1
a2 = –(1 – (alpha/A))/(1 + (alpha/A))
4. The transfer function implemented by the AD1953 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 standard form. This form is used in this document because the AD1953
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)
相關(guān)PDF資料
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AD1953YST 16-bit fixed point DSP with Flash
AD1953YSTRL 16-bit fixed point DSP with Flash
AD1953YSTRL7 16-bit fixed point DSP with Flash
AD1954 CONNECTOR COAXIAL BNC
AD1954YS RESISTOR
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