1. A Simple music visualizer
Team 11

2. Outline
Motivation
Related Work
Implementation
Demo

3. Motivation Music Visualization is cool.
We want to make our own music visualizer.

4. Related Work There are many ways to build a music visualizer
Java, C++, html5…
These are some engines that we found to build a music visualizer
Unity
3DS Max
There are even languages, frameworks design to do such kind of task
VSXU
AVS
So many Related Work 0.0

5. Implementation
Our approach is to use Processing (Java) to write our music visualizer
We use Java Minim library to do the SAP
Most of the Challenges are designing the music visualization, writing the algorithm.

6. Implementation - effects
Drawing Audio Spectrum
There are two ways : FFT or just draw the WaveForm
An easy Example will explain the stuff

7. Implementation - Effects
Beat Detecting is also one kind of effect.
We aim to detect the drum beat.
We basically use the default beat detection algorithm to accomplish the stuff

8. Implementation – drum beat detect
The Algorithm by Frédéric Patin – link (2003)
We use sound Energy mode to detect the drum beat
Current Sound Energy can be calculated by the following formula

9. We could also calculate the Local average Sound Energy using history Buffer
If our Current Sound Energy e is larger than C * <E> (C is a constant). We got a beat.
Now go to the part to find the constant C

10. Find The Variance of the average local energy
The Magic part

11. Demo Time
Hope we don’t fail 0.0/

12. FAQ
Thank you very much!
If you have any idea of the effect, feel free to write them down on the WebContest page.