parabPeakInterpol {soundgen} | R Documentation |
Parabolic peak interpolation
Description
Internal soundgen function
Usage
parabPeakInterpol(threePoints, plot = FALSE)
Arguments
threePoints |
the amplitudes of three adjacent points (beta is the peak), ideally spectrum on a dB scale, obtained with a Gaussian window |
plot |
if TRUE, plot the points and the fit parabola |
Details
Takes a spectral peak and two adjacent points, fits a parabola through them, and thus estimates true peak location relative to the discrete peak. See https://ccrma.stanford.edu/~jos/sasp/Quadratic_Interpolation_Spectral_Peaks.html
Value
Returns a list: $p = the correction coefficient in bins (idx_beta + p gives the true peak), $ampl_p = the amplitude of the true peak
Examples
soundgen:::parabPeakInterpol(c(-1, 0, -4), plot = TRUE)
[Package soundgen version 2.7.0 Index]