touch-tone-system.zip_touch

load touch w = -pi : (2 * pi) / 2047 : pi; t1 = x2(1 : 1000); t2 = x2(1101 : 2100); t3 = x2(2201 : 3200); t4 = x2(3301 : 4300); t5 = x2(4401 : 5400); t6 = x2(5501 : 6500); t7 = x2(6601 : 7600); X21 = fftshift (fft(t1, 2048)); X22 = fftshift (fft(t2, 2048)); X23 = fftshift (fft(t3, 2048)); X24 = fftshift (fft(t4, 2048)); X25 = fftshift (fft(t5, 2048)); X26 = fftshift (fft(t6, 2048)); X27 = fftshift (fft(t7, 2048)); figure(1) subplot(2, 1, 1); plot(w, abs(X21)); hold plot(0.5346, 1 : 500, 'r' ); plot(1.0247, 1 : 500, 'r' ); axis([0.5, 1.25, 0, 500]); title('X21'); text(0.5346, 400,'peak value : 0.5346'); text(1.0247, 400,'peak value : 1.0247'); subplot(2, 1, 2); plot(w, abs(X22)); hold plot(0.5906, 1 : 500, 'r' ); plot(1.0247, 1 : 500, 'r' ); axis([0.5, 1.25, 0, 500]); title('X22'); text(0.6535, 400,'peak value : 0.5906'); text(1.1328, 400,'peak value : 1.0247'); figure(2) subplot(2, 1, 1); plot(w, abs(X23)); hold plot(0.5346, 1 : 500, 'r' ); plot(1.1328, 1 : 500, 'r' ); axis([0.5, 1.25, 0, 500]); title('X23'); text(0.5346, 400,'peak value : 0.5346'); text(1.1328, 400,'peak value : 1.1328'); subplot(2, 1, 2); plot(w, abs(X24)); hold plot(0.5346, 1 : 500, 'r' ); plot(0.9273, 1 : 500, 'r' ); axis([0.5, 1.25, 0, 500]); title('X24'); text(0.5346, 400,'peak value : 0.5346'); text(0.9273, 400,'peak value : 0.9273'); figure(3) subplot(2, 1, 1); plot(w, abs(X25)); hold plot(0.7217, 1 : 500, 'r' ); plot(1.0247, 1 : 500, 'r' ); axis([0.5, 1.25, 0, 500]); title('X25'); text(0.7217, 400,'peak value : 0.7217'); text(1.0247, 400,'peak value : 1.0247'); subplot(2, 1, 2); plot(w, abs(X26)); hold plot(0.7217, 1 : 500, 'r' ); plot(1.0247, 1 : 500, 'r' ); axis([0.5, 1.25, 0, 500]); title('X26'); text(0.7217, 400,'peak value : 0.7217'); text(1.0247, 400,'peak value : 1.0247'); figure(4) subplot(2, 1, 1); plot(w, abs(X27)); hold plot(0.7217, 1 : 500, 'r' ); plot(1.0247, 1 : 500, 'r' ); axis([0.5, 1.25, 0, 500]); title('X27'); text(0.7217, 400,'peak value : 0.7217'); text(1.0247, 400,'peak value : 1.0247');