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MPEG-4 Structured Audio

MPEG-4 Structured Audio. Mihir Anandpara EE 382C – Embedded Software Systems. Overview. Motivation MPEG-4 Structured Audio formats Decoder/Synthesizer Implementations Project Objectives. Motivation and Background. MPEG-4 standard Traditional audio coding techniques

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MPEG-4 Structured Audio

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  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?

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