1. MPEG-4 Structured Audio Mihir Anandpara EE 382C – Embedded Software Systems

2. Overview Motivation MPEG-4 Structured Audio formats Decoder/Synthesizer Implementations Project Objectives

3. Motivation and Background MPEG-4 standard Traditional audio coding techniques Information-theoretic coding Perceptual coding Structured coding

4. Structured Audio in MPEG-4 Synthesis through programs Music-N languages, CSound Structured Audio Orchestra Language (SAOL) Wavetable synthesis Score based synthesis

5. Example instr tone () { // variable declaration asig x, y, init; if (init == 0) { init = 1; x = 0.5; } x = x - 0.196307*y; y = y + 0.196307*x; output(y); } 0.25 tone 4.0 4.50 end

6. SA decoder/synthesis tools saolc and sfront SAINT and Virtual DSP

7. Project Goals Investigation of real-time implementation issues Operating System/Thread execution engine to synchronize and provide concurrency

8. Questions?