Signal Processing Commands besself Create a Bessel filter. besself3 Create a Bessel filter. blackman Blackman window. butter Create a Butterworth filter. buttord Design a Butterworth filter. cheb1ord Design a Chebyshev I filter. cheb2ord Design a Chebyshev II filter. chebwin Dolph-Chebyshev window. cheby1 Create a Chebyshev I filter. cheby2 Create a Chebyshev II filter. cpsd Compute cross power spectral density. downsample Downsample a signal. ellip Create an Elliptic filter. ellipord Design an Elliptic filter. fft Fast Fourier Transform. fft2 Two Dimensional Fast Fourier Transform. filter Filter a signal with an IIR or FIR filter. filtfilt Filter a signal forward and then backward, compensating for end effects. fir1 Create a digital FIR filter. fold Create one-sided spectrum amplitude vectors from the two-sided equivalents. freq Generate a vector of frequency locations. freqs Compute analog filter frequency response values. freqz Compute digital filter frequency response values. hamming Hamming window. hann Hann window. ifft Inverse Fast Fourier transform. impz Compute the impulse response of a digital filter. invfreqs Compute analog filter coefficients from frequency response values. invfreqz Compute digital filter coefficients from frequency response values. kaiser Kaiser-Bessel window. parzenwin Parzen window. pwelch Compute power spectral density. sinc Compute the sinc function. unwrap Unwrap a vector of phase angles. upsample Upsample a signal. welchwin Welch window. xcorr Cross correlation.