stft(含:短时傅立叶变换 Gabor变换等)

				% Chapter 05: Example 5.22 Ploting of FFT execution times
				%
				load fft_time.mat;
				top = ceil(max(fft_time));
				%n = 1:2048;
				subplot
				clg
				plot(n,fft_time,'.');axis([0,2500,0,50])
				xlabel('N');ylabel('Time in Sec.')
				title('FFT execution times')
				text(2100,top,'o(N*N)')
				text(2100,top/2,'o(N*N/2)')
				text(2100,top/3,'o(N*N/3)')
				text(2100,top/4,'o(N*N/4)')
				text(2100,1,'o(N*logN)')