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