Sound

What:

Sound, in Physics is a Wave. Waves, remember, have certain properties:

• Frequency - refers to pitch
• Amplitude - volume / loudness

Representing Sound:

As a Waveform:

• Imagine that’s a 10 second clip of me speaking. x-axis refers to a given point of time.
• y-axis refers to amplitude of wave at that point in time.
• Frequency is amount of peaks in a given point of time.
• This is referred to as analog sound.
• Also fairly easy to normalise from this.

As Spectrogram:

• Colour (dBFS - decibels relative to full scale)
• Darker spots are typically silence.
• Every word is split up into Phonemes, which each have their own frequency patterns.

Measuring it:

When measuring digital sound, we split it into “samples”. This is simply a measurement of the audio’s amplitude at that point in time.