Advanced | SIFREQ

FUNDAMENTAL FREQUENCY – [SIFREQ]
Compute the exact fundamental frequency of a signal.
CATEGORY
SI5

DESCRIPTION
Compute the fundamental frequency of the input signal in Hertz [Hz] using an approximate fundamental frequency and using the Brent method
RESULT VARIABLES AND PARAMETERS

Result	Fundamental frequency [Hz]. If the function returns zero as a result, this means that the fundamental frequency was not found, probably because the deviation from the approximate fundamental frequency provided is too large.
Signal	Input signal to perform calculation
Freq_Approx	Approximate and initial fundamental frequency in Hz.
Begin_time	Time at which the analysis of a signal must start. This time is expressed in milliseconds [ms]. This value must be greater than 0 and lower than the size of the acquisition buffer. The default value is 0.
End_time	Time at which the analysis of a signal must end. This time is expressed in milliseconds [ms]. The value of this time must be larger than the specified begin_time and smaller than the duration of the test. Use the “HUGE” value to specify the end of the test. The default value is HUGE.
Factor	Multiplying factor for the results generated by the function. The default value of the multiplying factor is 1.0 and has no effect on the results.

SYNTAX
res = sifreq(input, 60, 0, HUGE, 1)
CHARACTERISTICS
Data type support
Double Floating point
EXAMPLE