> Tech­nique

1. Spec­tro­gram ba­sics

Computer Music - - Make Music Now / Spectral Synthesis -

Here’s how to get a colour­ful rep­re­sen­ta­tion of fre­quency over time us­ing Au­dac­ity…

1 Most au­dio ed­i­tors of­fer some means by which to an­a­lyse a sound. Let’s use the free Au­dac­ity au­dio ed­i­tor to take a look at a com­plex sound made up of a few dif­fer­ent tim­bres piled on top of each other. Open StackedTrack.wav in Au­dac­ity – we see the stan­dard am­pli­tude dis­play.

2 Play the file and take a lis­ten. A rat­tling prayer drum hits first, a set of chimes ring out for a bit, and a syn­thetic bass drone runs un­der­neath. Most of the ac­tion is near the start, as our wave­form shows. Go to the up­per­left of the track and use the drop-down menu to select Spec­tro­gram.

3 Now we can see more than just the over­all am­pli­tude of our wave­form. The ver­ti­cal axis rep­re­sents fre­quency, while the colour de­picts the am­pli­tude of a given fre­quency: grey in­di­cates si­lence, blue is louder, red louder still, and yel­low and white the loud­est. You can also clearly see the bursts of bright colours when tran­sients oc­cur.

Newspapers in English

Newspapers from Australia

© PressReader. All rights reserved.