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Frequency-RPM map for order analysis

returns
the frequency-RPM map matrix, `map`

= rpmfreqmap(`x`

,`fs`

,`rpm`

)`map`

, that results
from performing frequency analysis on the input vector, `x`

. `x`

is
measured at a set `rpm`

of rotational speeds expressed
in revolutions per minute. `fs`

is the sample rate
in Hz. Each column of `map`

contains root-mean-square
(RMS) amplitude estimates of the spectral content present at each
value of `rpm`

. `rpmfreqmap`

uses
the short-time Fourier transform to analyze the spectral content of `x`

.

specifies
options using `map`

= rpmfreqmap(___,`Name,Value`

)`Name,Value`

pairs in addition to
the input arguments in previous syntaxes.

`rpmfreqmap(___)`

with no output
arguments plots the frequency map as a function of rotational speed
and time on an interactive figure. The plot is also known as a *Campbell
diagram*.

[1] Brandt, Anders. *Noise and Vibration Analysis:
Signal Analysis and Experimental Procedures*. Chichester,
UK: John Wiley & Sons, 2011.

`orderspectrum`

| `ordertrack`

| `orderwaveform`

| `rpmordermap`

| `rpmtrack`

| `spectrogram`

| `tachorpm`