edsp::feature::perceptual Namespace Reference

Functions
template<typename ForwardIt >
constexpr auto	loudness (ForwardIt first, ForwardIt last)
	Computes the loudness of the elements in the range [first, last) More...

Function Documentation

loudness()

template<typename ForwardIt >

constexpr auto edsp::feature::perceptual::loudness	(	ForwardIt	first,
		ForwardIt	last
	)

Computes the loudness of the elements in the range [first, last)

The loudness is estimated with the Steven's Power Law. S.S. Stevens proposed a new law to relate sensation magnitude to stimulus intensity.

\[ S = k I^{\alpha} \]

where:

• S is the sensation magnitude
• k is an arbitrary constant
• I is the stimulus intensity
• \( \alpha \) is the power exponent.

To compute the loudness, we consider the energy of the signal as the stimulus intensity and \( \alpha = 0.67 \) (sound pressure of 3000-Hz tone).

Parameters

first	Forward iterator defining the begin of the range to examine.
last	Forward iterator defining the end of the range to examine.

Returns

The estimated loudness of the elements in the range.