why won't this code decode a voice code? do I need to plug the decoded digits into an array and decode the voice code that way? here is the matlab code; clear

clc

$\%$ Voice$-$Code Breaker

clc;

clear;

$\%$ Load the corrupted voice code file

$[$voiceCode$,$ fs$]=$ audioread$(\text{'}$VoiceCode $(5).$wav'$)$;

$\%$ Define parameters

digit$\_$samples $=16000$; $\%$ Number of samples per digit

num$\_$samples $=$ length$($voiceCode$)$;

num$\_$digits $=$ floor$($num$\_$samples $/$ digit$\_$samples$)$; $\%$ Calculate the number of digits

fprintf$(\text{'}$Number of digits in the voice code: $\%$d

$\text{'},$ num$\_$digits$)$;

$\%$ Preallocate storage for digit segments

digit$\_$segments $=$ cell$($num$\_$digits, $1)$;

for i $=1$:num$\_$digits

start$\_$idx $=($i $-1)*$ digit$\_$samples $+1$;

end$\_$idx $=$ i $*$ digit$\_$samples;

digit$\_$segments$\{$i$\}=$ voiceCode$($start$\_$idx:end$\_$idx$)$; $\%$ Extract each digit's segment

end

$\%$ Generate synthetic templates for digits $0$ to $9$

templates $=$ cell$(10,1)$;

for i $=0$:$9$

t $=(0$:digit$\_$samples $-1)/$ fs; $\%$ Time vector

freq $=500+100*$ i; $\%$ Frequency corresponding to each digit

templates$\{$i $+1\}=$ sin$(2*$ pi $*$ freq $*$ t$)\text{'}$; $\%$ Generate sine wave template

end

$\%$ Initialize result storage

decoded$\_$digits $=$ zeros$(1,$ num$\_$digits$)$;

inner$\_$products $=$ zeros$($num$\_$digits, $10)$;

$\%$ Decode each digit

for digit$\_$idx $=1$:num$\_$digits

$\%$ Compute inner products with all templates

for template$\_$idx $=1$:$10$

inner$\_$products$($digit$\_$idx, template$\_$idx$)=$ abs$($dot$($digit$\_$segments$\{$digit$\_$idx$\},$ templates$\{$template$\_$idx$\}))$;

end

$\%$ Identify the digit with the maximum inner product

$[$~$,$ max$\_$idx$]=$ max$($inner$\_$products$($digit$\_$idx, :$))$;

decoded$\_$digits$($digit$\_$idx$)=$ max$\_$idx $-1$; $\%$ Convert index to digit

end

$\%$ Output results

fprintf$(\text{'}$Decoded Voice Code: $\%$s

$\text{'},$ num$2$str$($decoded$\_$digits$))$;

disp$(\text{'}$Magnitudes of Inner Products:$\text{'})$;

disp$($inner$\_$products$)$;

$\%$ Plot the first digit and its corresponding template as separate figures

$\%$ Smooth the graphs using a moving average filter

window$\_$size $=50$; $\%$ You can adjust the window size for smoothing

smooth$\_$digit $=$ movmean$($digit$\_$segments$\{1\},$ window$\_$size$)$;

smooth$\_$template $=$ movmean$($templates$\{$decoded$\_$digits$(1)+1\},$ window$\_$size$)$;

$\%$ First digit samples

figure;

plot$($smooth$\_$digit$(1$:$1000),\text{'}$b$\text{'})$;

title$(\text{'}$First $1000$ samples of the first digit $($from the voice code$)\text{'})$;

xlabel$(\text{'}$Sample Index'$)$;

ylabel$(\text{'}$Amplitude$\text{'})$;

grid on;

$\%$ Corresponding template samples

figure;

plot$($smooth$\_$template$(1$:$1000),\text{'}$r$\text{'})$;

title$(\text{'}$First $1000$ samples of the corresponding template digit'$)$;

xlabel$(\text{'}$Sample Index'$)$;

ylabel$(\text{'}$Amplitude$\text{'})$;

grid on;

$\%$ Reconstruct the decoded voice code using the original digit segments

reconstructed$\_$voice$\_$code $=[]$;

for i $=1$:num$\_$digits

reconstructed$\_$voice$\_$code $=[$reconstructed$\_$voice$\_$code; digit$\_$segments$\{$i$\}]$; $\%$ Concatenate original voice segments

end

$\%$ Smooth the reconstructed voice code for better playback

reconstructed$\_$voice$\_$code$\_$smooth $=$ movmean$($reconstructed$\_$voice$\_$code, window$\_$size$)$;

$\%$ Play the reconstructed voice code

player $=$ audioplayer$($reconstructed$\_$voice$\_$code$\_$smooth, fs$)$;

disp$(\text{'}$Playing the reconstructed voice code...$\text{'})$;

play$($player$)$; this was the output; Number of digits in the voice code: $5$ Decoded Voice Code: $99651$ Magnitudes of Inner Products: $24\mathrm{.}801482\mathrm{.}895215\mathrm{.}371545\mathrm{.}30225\mathrm{.}280818\mathrm{.}967020\mathrm{.}628562\mathrm{.}939247\mathrm{.}515694\mathrm{.}903533\mathrm{.}879716\mathrm{.}888825\mathrm{.}413813\mathrm{.}815656\mathrm{.}535810\mathrm{.}7122118\mathrm{.}071748\mathrm{.}489998\mathrm{.}8843162\mathrm{.}808842\mathrm{.}339430\mathrm{.}79795\mathrm{.}115516\mathrm{.}827511\mathrm{.}827342\mathrm{.}925796\mathrm{.}405428\mathrm{.}873431\mathrm{.}756769\mathrm{.}924820\mathrm{.}601058\mathrm{.}902029\mathrm{.}885451\mathrm{.}867087\mathrm{.}8516120\mathrm{.}488662\mathrm{.}692963\mathrm{.}175588\mathrm{.}451742\mathrm{.}269133\mathrm{.}7335114\mathrm{.}555546\mathrm{.}05258\mathrm{.}069878\mathrm{.}58485\mathrm{.}143134\mathrm{.}807526\mathrm{.}59318\mathrm{.}871855\mathrm{.}3149$

Playing the reconstructed voice code...