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AN3984 датащи(PDF) 30 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) 30 Page - STMicroelectronics

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Matlab code (functions)
AN3984
30/46
Doc ID 022240 Rev 1
A.4
Low and high-shelf filter (ShelfFilterAPW.m)
%-------------------------------------------------------------------------%
%
function [CoeffAPW] = ShelfFilterAPW(Fc, Gain, Slope, FType,
%
CoeffRange, Fs)
%
Args:Fc -> Cutoff Frequency
%
Gain -> Gain
%
Slope -> Slope
%
FType -> Filter type (Low or High Shelf)
%
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 APWorkbench coeff for a Low or a High
%
Shelf Filter
%
%
STMicroelectronics - Agrate (ITALY)
%
MSH - Audio & Sound BU
%
Revision: 1.1
%
Date: 23 June 2011
%-------------------------------------------------------------------------%
%% Function code
function [Coeff_Hex, CoeffAPW, LimitValue] = ShelfFilterAPW(Fc, Gain, ...
Slope, FType,...
CoeffRange, Fs)
format long
%
if FType=0 =>LowShelf
%
if FType=1 =>HighShelf
if (nargin < 6)
Fs = 96000;
end
Teta = (2*pi*Fc)/Fs;
%Angle from frequency
SinTeta = sin(Teta);



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