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srfft
- 我的一个分裂基快速FFT变换程序.不知道有没有错-I split a fast FFT-based procedures. Do not know if it is right or wrong
fft
- Special Requirements ?nx must be a power of 2. ?The index array must be set up by bitrev_index before the function DSP_bitrev_cplx is called. ?If nx ?4K, one can use the char (8-bit) data type for the "index" variable. This would requ
example4_4
- 例4:在sinc(t)信号中叠加噪声,分析对应频谱 fs=100 采样频率,必须大于两倍基带信号最高频率 ts=1/fs 采样时间间隔 T=2 时间窗大小 - x=x+0.1*randn(1,N) x=awgn(x,-10, measured ) figure plot(t,x) title( 时域信号图 ) xlabel( t /s ) y=fft(x,N) figure if mod(N,2)~=0
strech
- 去斜率(strech)参考信号与回波信号混频后得到中频输出信号S(t)=Aexp(j*2*pi*f0*t+phase) 其中f0与回波延时的关系为: f0=k*delay_t K为线性调频斜率,delay_t为回波延时 将s(t)采样,FFT变换即可得到目标距离与频谱的关系。 Strech 信号测距 输入混频后的中频信号(图一),经采样及FFT变换得到频谱(图二) 再根据频谱与距离的关系式R=Tcf/2B显示出距离(图三) -Go slope (strech
deskew-110
- Skew detection and correction is very important task before pre-processing of an image and it is a major problem in scanned documents, if it not detected correctly it will lead wrong result in future during image analysis. During the scanning of th