basic 1 side echo cancellation

hi, i need to do a mini project in echo cancellation

,well i'v biult one and my teacher said its to difficult, in my understanding he deman with bo doubletalkdetector,with no non linear proccesor..

he said a conversation like in skype, where the voice that comeout from the speaker bounce in to the microphone with the acual voice of the preson .

so ,to take it into equations...

i have the x(n)=the voice that wire to the speaker

y(n)=built from to 2 signals,1 the accual voice,the second is the voice that came out from the speaker (must be twisted voice (no??))

so i need to change x(n) to x(spectral twisted voice(n))

and then y(n)=x(spectral twisted voice(n))+p(n) where p(n) is accual voice of the preson thats sit and talk

[yuval ohayon]

dememnd with no dtd and nlp