%例程3-10 產生掃頻信號頻譜

t = -1:0.001:1;                        %時間范圍為[-1 1]，采樣頻率為1kHz
fo = 100; f1 = 400;                    %起始頻率為100Hz，終止頻率為400Hz
y = chirp(t,fo,1,f1,'q',[],'convex');         
spectrogram(y,256,200,256,1000,'yaxis')