# Spectrum Analyzer

**URL:** <https://forum.kirupa.com/t/spectrum-analyzer/192827>\
**Category:** open source\
**Created:** [July 1, 2006, 5:22pm UTC](https://forum.kirupa.com/t/spectrum-analyzer/192827 "2006-07-01T17:22:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![devonair](https://avatars.discourse-cdn.com/v4/letter/d/3be4f8/32.png) [@devonair](https://forum.kirupa.com/u/devonair)\
**Post date:** [July 1, 2006, 5:22pm UTC](https://forum.kirupa.com/t/spectrum-analyzer/192827/1 "2006-07-01T17:22:57Z")

</div>

This seems to be everyone’s first AS3 endeavor (sorta like Pong is everyone’s first game), but oh well… gotta keep up with the joneses’s…

[AS]package {  
import flash.display.Shape;  
import flash.display.Sprite;  
import flash.media.Sound;  
import flash.media.SoundChannel;  
import flash.media.SoundMixer;  
import flash.utils.ByteArray;  
import flash.net.URLRequest;  
import flash.events._;  
import flash.geom._;

public class SpecAnny extends Sprite{  
private var \_barArray:Array;  
private var \_sound:Sound;  
private var \_sc:SoundChannel;  
private var \_ba:ByteArray;  
private var \_numBars:int;

public function SpecAnny(){  
\_barArray = new Array();  
\_sound = new Sound();  
\_sc = new SoundChannel();  
\_ba = new ByteArray();  
\_numBars = 8;

stage.frameRate=31;  
initDisplay();

function initDisplay():void{  
for (var i:int = 0; i \< \_numBars; i++){  
var bar:Shape = new Shape();  
var mat = new Matrix();  
mat.createGradientBox(5, -75, 90\*(Math.PI/180));  
bar.graphics.beginGradientFill(“linear”, [0x00FF00, 0x990000], [100, 100], [0, 255], mat);  
bar.graphics.drawRect(0, 0, 5, -75);  
bar.y = bar.height+50;  
bar.x = 50 + i\*8;  
addChild(bar);  
\_barArray.push(bar);  
}  
startSound();  
}

function startSound():void{  
\_sound.load(new URLRequest(“my.mp3”));  
\_sc = \_sound.play(0, 25);  
var enterFrameController:Sprite = new Sprite();  
enterFrameController.addEventListener (Event.ENTER\_FRAME, animate);  
}

function animate():void{  
var yscale:Number = 0;  
SoundMixer.computeSpectrum (\_ba, true, 0);  
for (var i:int = 0; i \< \_numBars; i++){  
yscale = \_ba.readFloat();  
\_barArray\*.scaleY = yscale;  
}  
}  
}  
}  
}[/AS]

example: [http://www.onebyonedesign.com/flash/specAnny/](http://www.onebyonedesign.com/flash/specAnny/)