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AN3984 датащи(PDF) 35 Page - STMicroelectronics

номер детали AN3984
подробное описание детали  The purpose of this document is to provide a tool to calculate
PDF  46 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3984 датащи(HTML) 35 Page - STMicroelectronics

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AN3984
Matlab code (functions)
Doc ID 022240 Rev 1
35/46
A.6
All-pass filter (AllPassFilterAPW.m)
%-------------------------------------------------------------------------%
%
function [Coeff_Hex, CoeffAPW] = AllPassFilterAPW(Fc, Q, CoeffRange,
%
Fs)
%
Args:Fc -> Cutoff Frequency
%
Q -> Quality factor
%
CoeffRange -> Coefficient Range (1, 2 or 4)
%
Fs -> Sample frequency
%
Return: Coeff_Hex -> APW filter Coeff
- Hex
%
CoeffAPW -> APW filter Coeff
- Floating Point
%
LimitVal -> Limit coeff value
%
%
Description: Generates the APWorkbench coeff for a All Pass Filter
%
%
STMicroelectronics - Agrate (ITALY)
%
MSH - Audio & Sound BU
%
Revision: 1.1
%
Date: 23 June 2011
%-------------------------------------------------------------------------%
%% Function code
function [Coeff_Hex, CoeffAPW, LimitValue] = AllPassFilterAPW(Fc, Q, ...
CoeffRange, Fs)
format long
if (nargin < 4)
Fs = 96000;
end
Teta = (2*pi*Fc)/Fs;
%Angle from frequency
SinTeta = sin(Teta);
CosTeta = cos(Teta);
alpha = SinTeta/(2*Q);
%% Coefficint Calculation
b0 = 1-alpha;
b1 = -2*CosTeta;
b2 = 1+alpha;



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