Spectral Analysis

coherence(vx, vy, n, r, [w]) Returns the coherence of vectors vx and vy. The signal vectors are divided into n overlapping intervals with fraction of overlap r. Each data segment is windowed with taper w.

cspectrum(vx, vy, n, r, [w]) Returns the cross spectrum of the vectors vx and vy. The signal vectors are divided into n overlapping intervals with fraction of overlap r. Each data segment is windowed with taper w.

pspectrum(v, n, r, [w]) Returns the power spectrum of v, computed by dividing v into n overlapping segments with overlap fraction r. Each data segment is windowed with taper w.

snr(vx, vy, n, r, [w]) Returns the signal-to-noise ratio for vx and vy. The signal vectors are divided into n overlapping segments with fraction of overlap r. Each data segment is windowed with taper w.

Arguments:

• v, vy, and vy are complex-valued signal vectors.
• n is an integer between 1 and length(vx) representing the subdivisions of the input signal(s).
• r is the overlap between subdivisions, expressed as a number 0 ≤ r < 1.

• w (optional) is an integer representing a windowing function. A rectangular window is used if w is omitted. The following table shows values for w and the windows they correspond to:

  Value of w	Window
  1	rectangular
  2	tapered rectangular
  3	triangular
  4	Hanning
  5	Hamming
  6	Blackman
  7	Nuttall