Lets add an echo to the signal with a delay of to = 0.12 seconds and an amplitude of α = 0.8. what is the delay n in samples? based on the difference equation, create an echo version of the signal x using the command y = conv(h, x); . what is h? listen to the output of the difference equation. do you hear the echo? 5. remove the echo. the difference equation above for modeling the echo is an lti system. to remove the echo, we need to implement the inverse system. whaterse system? what is the duration of this impulse response? 6. for the echo parameters you used above, plot the impulse response of the inverse system. make the horizontal axis in your plot in units of seconds. 7. implement the inverse of the echo system to perform