AN3984 datasheet(41/46 Pages) STMICROELECTRONICS

부품명	AN3984

상세설명	The purpose of this document is to provide a tool to calculate

PDF	46 Pages

Scroll/Zoom	100%

제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

Logo

41 / 46 page

AN3984

Matlab code (functions)

Doc ID 022240 Rev 1

41/46

A.10

Display coefficient and error messages (Display_Coeff.m)

%-------------------------------------------------------------------------%

function []=Display_Coeff(Filter_Coeff, CoeffAPW, LimitValue)

Args:Filter_Coeff -> APW filter Coeff

- Hex

CoeffAPW -> APW filter Coeff

- Floating

LimitVal -> Limit coeff value

Return: Display -> APW filter Coeff

- Hex

Description: Display Filter Coefficient (HEX)

STMicroelectronics - Agrate (ITALY)

MSH - Audio & Sound BU

Revision: 1.1

Date: 23 june 2011

%-------------------------------------------------------------------------%

function

[]=Display_Coeff(Filter_Coeff, CoeffAPW, LimitValue)

a0 = 1;

a1 =-2*CoeffAPW(3);

a2 = -CoeffAPW(4);

b0 =2*CoeffAPW(5);

b1 =2*CoeffAPW(1);

b2 = CoeffAPW(2);

Coeff = [b0 b1 b2 a0 a1 a2];

%% Check for stability and Limit

Error = 0;

if ((abs(b0)>=LimitValue) || (abs(b1)>=LimitValue)|| (abs(b2)>=LimitValue))

Error = 1;

end

if abs(a2)>1 && (abs(a1)>1+a2)

Error = 2;

end

AN3984 데이터시트(PDF) 41 Page - STMicroelectronics