This function computes the Fourier analysis of the instantaneous frequency of a time wave. This allows to detect periodicity in frequency modulation.
fma(wave, f, threshold = NULL, plot = TRUE, ...)an R object.
sampling frequency of wave (in Hz). Does not need to be specified if embedded in wave.
amplitude threshold for signal detection (in % ).
logical, if TRUE the spectrum of the instantaneous frequency
(by default TRUE).
other spec parameters.
If plot is FALSE, fma returns a numeric vector
corresponding to the computed spectrum.
If peaks is not NULL, fma returns a list with
two elements:
the spectrum computed
the peaks values (in kHz).
This function is based on ifreq and spec.
The instantaneous frequency of wave is first computed and the spectrum of this
frequency modulation is then processed. All env and spec arguments can be
set up.
# NOT RUN {
# a sound with a 1 kHz sinusoid FM
a<-synth(d=1, f=8000, cf=1500, fm=c(1000,1000,0,0,0), output="Wave")
fma(a)
# }
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