function?[input_signal?error_signal?desired_signal?filter_output?impulse?filter_current?mse?db?db_avg]=LMS（filter_size?step_size?input_file?iterations）
%?Function?to?perform?the?LMS?algorithm?on?an?input?file.
%?Inputs:???Filter?order?step?size?input?wav?file?number?of?iterations.
%?Outputs:??Input?signal?error?estimation?signal?（echo?cancelled）?desired?signal?（echoed?signal）?adaptive?filter?output?real?impulse?response
%???????????Estimation?of?impulse?response?mean?sqaure?error?attenuation?（dB）?average?attenuation.

%Read?in?the?input?file
input_signal?=?wavread（input_file）;
%?Create?the?impulse?response?for?the?desired?signal
impulse=zeros（filter_size1）;
for?（i=1:5）
????impulse（（（i-1）*filter_size/5）+1）=1/i;????
end

%?Convolve?the?impulse?with?the?input?signal?to?generate?the?desired?signal
desired_signal?=?conv（input_signal?impulse）;

%?initialise?adaptive?filter?impulse?and?input?vector?to?zero?vector?of?length?specified?at?command?line
filter_current?=?zeros（filter_size1）;
input_vector?=?zeros（filter_size?1）;

%?Loop?for?number?of?iterations?specified?in?command?line.
for?i=1:iterations
????i
????input_vector（1）=input_signal（i）;?????????%?insert?new?sample?at?beginning?of?input?vect