This is function that behaves like chirp (linear), except you can specify an initial phase angle. The purpose of this is to be able to have a series of several chirp time histories with seamless transitions between them. There is a second output which is starting phase for the next time series.
An example for a signal starting from zero Hz and ramping up to 40Hz and then back down to 10Hz is shown:
Jeremy (2021). chirpPh.m (https://www.mathworks.com/matlabcentral/fileexchange/47301-chirpph-m), MATLAB Central File Exchange. Retrieved .
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