matlab code in echo cancellation

[steph_smile09]

echo canceller matlab

can anybody help me about this code... pls explain this code in matlab.. im confused with this code... pls explain what is [zeros(1,echo_delay) s(echo_delay+1:samples)]

thanks in advanced

q(s)=echo_amp[zeros(1,echo_delay) s(echo_delay+1:samples)]
q is echo
echo_amp is the echo amplitude
echo_delay is the echo delay

 

[kswarnalatha]

matlab+echo+delay

q(s) refers to the actual echo(in a communication system echo refers to a delayed version of input i.e if the input starts at t=0,then echo would get added to it after sometime say 4s.)

the above LOC delays the i/p(dependin on echo delay)to generate an echo.

now lets assume samples=10 and echo delay=4,echo_amp=0.5, then echo must be produced after 4 samples of input(with half the mag of input)
if i/p has the value say 6 2 4 5 6 9 7 8 2 3 .then echo q(s)=0.5 *( 0 0 0 0 6 2 4 5 6 9).