AN3984 datasheet(39/46 Pages) STMICROELECTRONICS

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AN3984

Matlab code (functions)

Doc ID 022240 Rev 1

39/46

A.8

Float to hex conversion (myFloat2Hex.m)

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

function [floatN] = myFloat2Hex(hexN, range)

Args:hexN -> hexadecimal number to be converted in string format

without the 0x, i.e. 0x123456 => '123456' (24 bits

only)

range -> coefficients range 4, 2, 1

Return: floatN -> floating point notation number

Description: converts a fixed point hexadecimal number into a

floating point one

STMicroelectronics - Agrate (ITALY)

MSH - Audio & Sound BU

Revision: 1.1

Date: 23 June 2011

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

function [hexN] = myFloat2Hex(floatN, range)

format long

quantizerSetup.mode = 'fixed';

% quantizerSetup.roundmode = 'nearest';

quantizerSetup.roundmode = 'ceil';

quantizerSetup.overflowmode = 'saturate';

%Quantizer to translate from hex to num

if(range == 1)

quantizerquantizerSetup.format = ([24 23]);

elseif(range == 2)

quantizerquantizerSetup.format = ([24 22]);

elseif(range == 4);

quantizerquantizerSetup.format = ([24 21]);

end

q = quantizer(quantizerquantizerSetup);

AN3984 Datasheet(PDF) 39 Page - STMicroelectronics