AN3984 datasheet(30/46 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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30 / 46 page

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);

AN3984 bảng dữ liệu(PDF) 30 Page - STMicroelectronics