The frequency of drop is the rate of change in pitch. In our case a frequency of 30 Hz or so; it means that the pitch of one frequency is dropping by one one-thousandth of a second.

In mathematics we use the concept called the ratio (number of frequency in units of one-millionth). In other words, in our musical note, one-thousandth of a second is a frequency of 30 Hz or 3.2 Hz. At the other end of the scale, a pitch one-thousand times weaker than a pitch 100 times weaker becomes one one-thousandth weaker.

How is it measured?

A musical note is usually played by a musical instrument which has two or more resonating voices. The resonating voice is the one that is heard by the ear.

The two main ways to measure a musical note are:

1 – The pitch (frequency) of the resonating voice

2 – the note distance (how far away from the voice)

The second of these two measurements is commonly referred to as the spectral density (SPD) measurement.

I’ve never got the concept of SPD down, but here is a description: (from Wikipedia)

There is a measure of spectral energy (SPD) called the spatial spectral density or SPD, which is the ratio of the distance from an impulse of a single sound source to that of an impulse coming from different sound sources.

Basically, the SPD determines how far away the sound reaches – to what a certain distance in a sound wave is the result of a simple mathematical formula.

Here it is:

SPD can range from 0 to 1, so 1 for a normal sound (no pitch shifting), 0.5 for a high enough pitch and 1.25 for a low enough pitch that an impulse coming from the same sound source is more than a tone.

How does it work?

Spectral density tells you how many times one pitch varies, or changes, while another pitch stays the same in strength (i.e. same pitch as before).

SPD is also called relative spectra because it is about how much one pitch sounds like another, or is similar to, or better than another.

This is known as spectral distribution, spectral density or spectral dispersion.

This way of calculating SPD allows you to compare two pitches when both have the same SPD (

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