Peak of spectrogram frequency estimation Estimates the instantaneous frequency of the input signal by extracting the peaks of the spectrogram. Usage: ife = sfpe (signal, window_length, time_res [, fft_length] ) Parameters: signal Input one dimensional signal to be analysed. An analytic signal is required for this function, however, if signal is real, a default analytic transformer routine will be called from this function before computing spectrogram. window_length The size of the kernel used for analysis. window_length must be odd. The kernel used will be defined from -(window_length+1)/2 to +(window_length+1)/2 in both time and lag dimensions. time_res The number of time samples to skip between successive slices of the analysis. fft_length Zero-padding at the fft stage of the analysis may be specified by giving an fft_length larger than normal. If fft_length is not specified then the next highest power of two above the signal length will be used. If fft_length is not a power of two, then the next highest power of two is used. See Also: spec