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

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Presentation transcript:

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

Overview Structured Audio Systems Audio Synthesis and Effects processing in MPEG-4 AudioBIFS layer in MPEG-4 Software Implementation and Results Conclusions and Future Work

Structured Audio Structured Coding v/s Traditional Coding Audio Synthesis through programs

Structured Audio in MPEG-4 Structured Audio Orchestra Language – SAOL Run-time control of sound through score Audio rate and Control rate separation Custom effects processing on sound signal

AudioBIFS Audio Binary Information For Scene Description Audio Composition, Effects Processing and Virtual Reality Modeling Scene Graph setup

Example

AudioFX node Download of custom effects post- processing on the composited/decoded sound signal Examples: Simple echo Reverberation Chorus

Complexity of Effects processing algorithms Critical issue in studying implementation of an execution engine for effects processing Complexity Vector Core Opcode calls Floating point divides, multiplies Memory accesses

Software Implementation Scene Graph setup AudioMix, AudioSwitch, AudioDelay nodes for sound composition Flexible and scalable signal processing engine for AudioFX node to implement several effects

Results Implementation of a subset of the AudioBIFS system SAOL execution engine for AudioFX Complexity analysis of typical effects processing algorithms Investigation of parallel execution of effects processing algorithms

Future Work Implementation of block-based signal processing at control rate

Questions?