Sound, waves and audio
Sound is a change in air pressure through a medium. A waveform is a DAW’s view of a changing audio signal over time.
A waveform is a view of an audio signal
Schematic signal outline plotted against time. The trace represents changing signal level; it is not a picture of the sound's full character or the air itself.
Text equivalent
The plot has time increasing left to right and signal level rising and falling around a centre line. The short strong change at the start represents a transient; the later repeating cycles represent a sustained signal. A DAW displays the audio signal, not a complete description of the sound or a literal image of air movement.
Microphones convert pressure changes into signals; electronic instruments can generate signals directly. Zoom, display scaling and channel view change what the trace shows. Use it to inspect a question, then listen to the sound again.
LISTEN
Choose two sounds you can lawfully play: for example, a short hand clap and a held note from an included instrument. Notice which stops quickly, which continues, and whether either changes over time. If you cannot audition them now, use the descriptions: a transient concentrates its change near an onset; a sustained tone continues after it begins.
TRY
In a DAW, place or record those sounds and inspect their waveform. Zoom in and out on the same event. Compare what changes on screen with what stays the same in playback. Keep the monitor comfortable; do not raise output to make the display or sound more dramatic.
Observational listening: with lawful music already available to you, note when an element enters or disappears, how dense a section feels, where energy changes, or what seems focal. Record observations in your own words. This is not a request to copy any melody, lyric, recording, signature sound or setting.
APPLY
Write one brief observation about your project sound (or the sound you plan to use), then distinguish heard from seen: “I hear a short bright click” is an audible description; “the display has a narrow peak at the start” is visual. Neither observation alone proves the other.
Keep a short project brief and these starting notes under your control. At the end of Module 1, preserve them as a clearly named checkpoint or bounce alongside the project so you can compare your starting point later. Your DAW decides how versions are saved; no particular filename is required.
Source: OpenStax, Sound Waves.
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