xlabel('frequency')
ylabel('echo')
figure
plot(f,angle(echo),'-',f,angle(dig_hyb),'-.')
axis([0 4000 -pi pi])
legend('echo','digital hybrid response')
xlabel('frequency')
ylabel('echo')
figure
plot(f,20*log10(abs(echo)),'-',f,20*log10(abs(echo+dig_hyb)),'-.')
axis([0 4000 -42 0])
legend('echo','cancelled signal')
xlabel('frequency')
ylabel('rejection')
AN84
Rev. 0.6
9