View source: R/spectral_methods.R
InstantaneousFrequency  R Documentation 
Calculates instantaneous frequency from an analytic signal.
InstantaneousFrequency(asig, tt, method = "arctan", lag = 1)
asig 
Analytic signal produced by 
tt 
Sample times 
method 
How the instantaneous frequency is calculated.

lag 
Differentiation lag, see the 
instfreq 
Instataneous frequency in 1/time 
The "arctan"
method was adapted from the hilbertspec
function in the EMD
package.
!!IMPORTANT!!
The numeric differentiation may be unstable for certain signals.
For example, high frequency sinusoids near the Nyquist frequency can give inaccurate results when using the "chain"
method.
When in doubt, use the PrecisionTester
function to check your results!
Daniel C. Bowman danny.c.bowman@gmail.com
PrecisionTester
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