These are all the utilities you need to generate MPEG-I movies on a
UNIX box with full MOTION video and stereo sound. For more information
on this unusual application of Linux, look in the docs directory or go
to www.freeyellow.com/members4/heroine
Rotating shafts experience a an elliptical MOTION called whirl. It is important to decompose this MOTION into a forward and backward whil orbits. The current function makes use of two sensors to generate a bi-directional spectrogram. The method can be extended to any time-frequency distribution
％
％ compute the forward/backward Campbell/specgtrogram
％
％ INPUT:
％ y (n x 2) each column is measured from a different sensor
％ ///////
％ __
％ |s1| y(:,1)
％ |__|
％ __
％ / \ ________|/
％ | | | s2 |/ y(:,2)
％ \____/ --------|/
％
％ Fs Sampling frequnecy
％
％ OUTPUT:
％ B spectrogram/Campbel diagram
％ x x-axis coordinate vector (time or Speed)
％ y y-axis coordinate vector (frequency [Hz])
