AN3984 datasheet(35/46 Pages) STMICROELECTRONICS

tên linh kiện	AN3984

Giải thích chi tiết về linh kiện	The purpose of this document is to provide a tool to calculate

PDF	46 Pages

Scroll/Zoom	100%

nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

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35 / 46 page

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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