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The Future of Sound Reinforcement(?)

The Future of Sound Reinforcement(?). Prof. David G. Meyer School of Electrical & Computer Engineering. Outline. Sound Reinforcement System Design Goals Factors Which Complicate Sound Reinforcement System Design Proven Ways to Design Sound Reinforcement Systems New Developments

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The Future of Sound Reinforcement(?)

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  1. The Future of Sound Reinforcement(?) Prof. David G. Meyer School of Electrical & Computer Engineering

  2. Outline • Sound Reinforcement System Design Goals • Factors Which Complicate Sound Reinforcement System Design • Proven Ways to Design Sound Reinforcement Systems • New Developments • Summary / Conclusions

  3. Sound Reinforcement System Design Goals • evenness of coverage • intelligibility (articulation loss of consonants) • ratio of direct sound field to reverberant sound field • gain before feedback • SPL at furthest listening position • frequency range/response • smoothness of frequency response curve • locality of reference • headroom

  4. Factors Which Complicate Sound System Design • reverberation / echo • early / late arrivals • room surfaces (absorption) • room geometry • seating characteristics • variable fill • empty room  full room

  5. Proven Ways to Design Sound Reinforcement Systems • central cluster • excellent coverage • high intelligibility • high gain before feedback • smooth frequency response • good locality of reference • cluster needs to be large for long, narrow room • potential for interference in driver overlap regions • hard to hide architecturally • “ugly hanging mess”

  6. Central Vertical Line Array

  7. Proven Ways to Design Sound Reinforcement Systems • split source / “point and shoot” • best if multi-channel • high intelligibility • potential solution for challenging room geometries • generally more aesthetically pleasing (but not always) • potential for creating large interference zone • potential for loss of locality of reference • potential for limited frequency range over which directional control is possible

  8. Split Source / “Point and Shoot”

  9. Proven Ways to Design Sound Reinforcement Systems • distributed / delayed • good solution for large, absorptive rooms with low ceilings • potential solution for challenging room geometries • potential solution for reinforcing “distant” zones • requires digital delays / multiple amplifiers (expensive) • potential for loss of locality of reference • generally not well suited for rooms with high ceilings (or that are highly reverberant)

  10. Distributed / Delayed

  11. New Developments • Before its time in ’89… • Renkus-Heinz Iconyx • Yamaha YSP-1 • Pioneer PDSP-1 • Sounds Good • Patent 7130430

  12. Back to the problematic long, narrow room…

  13. 15+ years later…

  14. http://www.yamaha.com/yec/soundprojectors/

  15. http://www.pioneer.eu/eur/content/press/news_20021010_PDSP1.htmlhttp://www.pioneer.eu/eur/content/press/news_20021010_PDSP1.html

  16. ECE 477 Digital Systems Senior Design Project  Spring 2007 SOUNDS GOOD / DS3Digital Steerable Sound System Joe Land, Ben Fogle, James O’Carroll, Elizabeth Strehlow PROJECT DESCRIPTION: USER INTERFACE UNIT: USER MENUS CONCEPT: • Digitally Steerable Sound System, allows for non-ideal placement of speakers • Six Preset Equalization Modes • Wireless Control Interface PCB LAYOUT: ILLUSTRATION OF CONCEPT: LOUDSPEAKER UNIT: Top Copper Bottom Copper SIGNAL PATH: FRONT BACK Digijock(ette)-Strength Digital System DesignTM

  17. Back to the future? 2006 1981

  18. Summary / Conclusions • there is no universal, “one size fits all” solution to sound reinforcement system design • knowledge of physics (sound propagation, room acoustics), electrical engineering (amplifier technology, wireless microphones), and computer engineering (digital signal processing, network technology, system monitoring, automation/control) are all helpful in formulating an optimal solution • there are some new, exciting possibilities!

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