Spectral centroid manipulations

1. What is spectral centroid in audio?
2. What is Centroidal frequency?
3. What is centroid wavelength?
4. How do you find the centroid of a peak?

What is spectral centroid in audio?

Spectral centroid (SC)—This is the most commonly used audio feature. It gives the center of gravity of the magnitude spectrum or, in other words, it indicates the central mass of the spectrum. It basically gives the frequency band where most of the energy is concentrated.

What is Centroidal frequency?

Spectral centroid is the amplitude-weighted mean of several frequency components. For example, given three frequencies (200, 400, 900 Hz) of equal amplitude, the corresponding spectral centroid would be the arithmetic mean of the three frequencies (i.e. 750 Hz).

What is centroid wavelength?

Centroid Wavelength: The wavelength value where half of the light energy is at shorter and half the energy is at longer wavelengths. Value is stated in nanometres (nm) or microns (µm). This value is of interest to people in the test and measurement industries.

How do you find the centroid of a peak?

Centroiding amounts to finding the "center of mass" of a given peak. The formula for determining the centroid of a range of values (such as intensity/signal) is xcm=∑xiIi∑Ii.