1. Prof. Wolfgang Nebel, Prof. Bärbel Mertsching, Prof. Birger Kollmeier PRO-DASP Power Reduction on Digital Audio Signal Processing "PRO-DASP: Verlustleistungsminimierung durch ein Software- Optimierungs-Framework mit einer hierarchischen, zieltechnologieunabhängigen Modulbibliothek für die digitale Audiosignalverarbeitung mit integriertem Gütemaß“ Nikolaus Voß, Universität Hamburg

2. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Structure PRO-DASP cooperation Motivation for our work Design-Framework Module structure and example with results Conclusion

3. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Cooperation I AG EHS Behavioral Power Analysis/Optimization AG MEDI Audio-Algorithms and Quality Assessment AG IMA Macro-Module Library and Design-Flow Verification

4. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Cooperation II Algorithmic Behavioral RT funct. struct. Gate Netlist Layout ORINOCO ® EIS MEDI IMA Macro- Modules & Quality- assessment Synthesis- Flow Flow- Verification

5. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Motivation Existence of commerical power optimization for RTL and below General behavioral estimation/optimization with ORINOCO Specialized behavioral macros for low power audio signal processing

6. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Requirements 1.Multiple algorithmic module levels 2.Variety of transformations 3.Noise tolerance  Vast design space  Integration of macros into a design- framework

7. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Design-Framework Features: 1.Power optimization on behavioral level 2.Generation of technology independend synthesis code 3.Allows (automatic) optimization on lower levels with other tools 4.Extensive applicability (hearing aids, mobile computing, …) 5.Easy to use

8. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Macro-Module Embedding C++ prototype for simulation/quality assessment and parameter optimization Generates specific (Behavioral-) VHDL implementation Module ORINOCOAudio-TB Hardware Commercial Tools BC, DC, PC, SIM Audio-Data BC-VHDL Constraints

9. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Arithmetic Modules Low-Level modules  Can be combined with higher level modules Multiple VHDL implementations possible: 1.Behavioral VHDL for constrained synthesis 2.RTL-VHDL with multiple architectures

10. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Arithmetic Module Hierarchy Arithmetic TL-Module Sign-Mag. B-VHDL RT-VHDL (1 stage) 2-compl.FloatLogarith. RT-VHDL (2 stage) RT-VHDL Netlist

11. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Arithmetic Modules: Signal Stats I

12. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Arithmetic Modules: Signal Stats II

13. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Float-Module: Quality Example: FIR-Lowpass 44.1 kHz, equiripple 10-11 kHZ, 112 Taps Determine parameters for float-module via dynamic range evaluation and 3-AFC Test (AG MEDI)

14. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Float Module: Power Target Tech. UMC 0,18µm 1,8V 100 MHz

15. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 HL-Transformationen I a) Direktform IIb) Symmetr. Koeff.c) HODCMI 1) Hybrid optimal diff. Coeff. For multiplierless implem. (Muhammad & Roy (1997)

16. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 HL-Transformationen II

17. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Conclusion New approach in comparison to existing systems –Noise tolerance through integration of a valid audio quality measure –Multiple algorithmic module levels on the behavioral abstraction level –Optimizing modules embedded in a design-framework

18. Nebel, Mertsching, Kollmeier: PRO-DASP, DFG-Kolloquium 2003 Outlook / Future Work Integration of heuristic/probabilistic methods for module selection Graphical user interface / integration into Matlab/Simulink VLSI chip-design for example algorithm