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AN84

DIGITAL HYBRID WITH THE Si305X DAAS

Silicon Laboratories 

APPENDIX A—SAMPLE MATLAB CODE

AN84

A sample MATLAB program for use in setting the hybrid coefficients is shown below. The code takes the ACIM

(Register 30) setting and line model as an input and outputs the best coefficient for the digital hybrid to match the

line.

function hdh = dig_hybrid(ACIM, R1line, R2line, Cline, HtMag, HtPhase, HrMag,

HrPhase);

% hdh = dig_hybrid(ACIM, R1line, R2line, Cline, HtMag, HtPhase, HrMag, HrPhase);

%

% This function calculates the coefficient values for the digital

% hybrid given a R1+R2||C model for the line.

%

% ACIM : register setting of the AC termination

% R1line : line R1

% R2line : line R2

% Cline : line C

% HtMag : Transmit path response

% HtPhase : Transmit path response

% HrMag : Receive path response

% HrPhase : Receive path response

%

% hdh : digital hybrid coefficients

Nact=ACIM+1;

if(R1line==0), R1line=eps; end

if(R2line==0), R2line=eps; end

if(Cline==0), Cline=eps; end

%eps is the smallest value after 0

% Set sample rate and frequency grid

fs=16000;

f=[eps:1:7999];

w=2*pi*f/fs;

%%%%%% Transmit path (Ht)

Ht = HtMag .* exp(j*HtPhase)

%%%%%%% Receive path (Hr)

Hr = HrMag .* exp(j*HrPhase)

Rev. 0.6

7

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