2. Introduction
Hi everyone! My name is Julian,
I’m from Colombia, I am a 14
years old guy, coursing 8th grade
on my school having a music
focus-education.
I play the piano in my school’s
orchestra, and on my Tropical
Music band, and also I am
learning to play the guitar.
In this presentation I will show
teach you about the properties of
the audio, taking in count
Amplitude, Frequency and
Timbre.
3. What is sound?
As we know sound is whatever we can hear, a
voice, a door, a plane, a telephone, etc.
Sound is a vibration that propagates through
a medium such as air or water and it’s made
from pressure variations in the air.
Everything sound we hear it’s produced by
something, for example, a drum produces
sound via a vibrating membrane, the voice
produces sound through the vocal folds, etc.
4. Propagation of sounds
Sound moving through a medium is known as
propagation.
Sounds moves through the air in a longitudinal
wave pattern, but sometimes is represented as a
transverse wave pattern.
5. Sound wave
A sound wave is the pattern of disturbance
caused by the movement of energy traveling
through a medium.
The sound wave includes several properties as
Amplitude and Frequency.
6. Amplitude
Amplitude is the size of the vibration, and this
determines how loud the sound is. The increase of
the loudness is called compression, and a decrease
is known as rarefaction.
Increasing or decreasing amplitude is called
amplification /attenuation.
7. Amplitude
The Amplitude is measured in Decibels (dB).
Digitally, amplitude is measured as Decibels
related to Full Scale (dBFS) which have a defined
maximum available peak level (0).
8. Frequency
Frequency is the number of occurrences of a
repeating event per unit time, measured in the
number of wavelengths over a period of time.
The human perception of Frequency is known as
pitch.
9. Frequency
In sound, frequency is measured in Hertz (Hz).
One cycle per second is 1Hz, ten cycle per
seconds are 10Hz.
The range of human hearing is approximately:
20Hz-20.000Hz (2kHz).
10. Timbre
Timbre, also known as tone color or tone quality is the
quality of a musical note or sound or tone that
distinguishes different types of sounds, such as voices
and musical instruments.
This sound characteristic is associated with the
complexity of the sound wave reaching the ear, that is
the overlap of the various harmonics and the respective
relative intensity.
11. All these properties are
needed to recognize the
difference between music
and noise.
