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Yamaha AFC2—Active Field Control (AFC) Enhances Reverberation in Soundfield—

LAS VEGAS, Nevada—InfoComm 2008 will mark the debut of the Yamaha AFC2, the successor to the highly successful AFC1 electro-acoustic technology system core processor that enables natural changes to major auditory impressions, such as reverberance, loudness and spaciousness within a soundfield of a performing arts venue, church, theater or school auditorium. The proprietary AFC system can be used to improve the architectural acoustic characteristics of a room, and has additional applications focusing on the advantages of optimized reverberation time.

“AFC is a regenerative system and is distinguishable from non-regenerative digital reverberation systems because AFC actively utilizes the acoustical feedback of a system to control acoustical conditions while preserving the existing room acoustics,? states Lon Brannies, AFC marketing manager, Yamaha Commercial Audio Systems, Inc. “As the core processor in an AFC system, the AFC2 utilizes the latest and most powerful of Yamaha’s digital signal processing devices and enables such systems to more easily integrate with Ethernet and other third party control networks.? AFC with the AFC2 is also used to increase the energy density of the diffused sound, so that reverberation time and sound energy density can be controlled with auditory naturalness while preserving the acoustical characteristics of the space.

AFC is a complete Yamaha turnkey system, with the AFC2 core processor which is based on the Yamaha DME64N (DSP Digital Mixing Engine) system. Other system components include a Yamaha AD8HR A/D Converter, DME Satellite-Series Processor, DA824 D/A Converter, Yamaha XM and PC Series amplifiers, and proprietary AFC speakers. A network control interface is required regardless of the control system used. Compatible control systems include ICP1, GPI, or AMX/Crestron.

AFC2 enhancements include 31-band Parametric EQ now standard and built into the module processing; open architecture DSP, 48KHz standard processing, and 16 channel slots are available when required. Up to 112 output channels are available, a significant increase from the unit’s predecessor, with up to 100 presets available (only six presets were available on AFC1), and adjustable live control settings. The unit is virtually operator free; for example, a sound field improvement effect can easily be made just by turning the power on and selecting a specific pattern.

Specifically designed and engineered for each individual space, AFC with the AFC2 core processor can add reflected sound energy by extending reverb time through time variant FIR (Finite Impulse Response) filters and increasing the gain of the FIR filters—uniformly distributing enhanced reflected energy, and can intensify the feeling of spaciousness by adding lateral reflections.

Active Field Control technology has been in use in Japan since 1985, and is being utilized in such U.S. installations as St. Michael & St. George Church in St. Louis, Miller Auditorium at Western Michigan State University, Victor H.S. and Vestal H.S. in upstate New York, and Crossroads Church in So. California. Systems are in use internationally at such high profile facilities as the Tokyo International Forum, the Hamamatsu Arena and Fukuoka Symphony Hall.

For more information on Yamaha’s Active Field Control technology and the Yamaha AFC2 core processor, visit Yamaha Commercial Audio Systems, Inc. at InfoComm 2008, Booths C3969 and C4069, Las Vegas Convention Center; write Yamaha Commercial Audio Systems, Inc., 6600 Orangethorpe Avenue, Buena Park, CA 90620; telephone (714) 522-9011; e-mail casales@yamaha.com; or visit www.yamahaca.com.


About Yamaha Commercial Audio Systems, Inc.:
Yamaha Commercial Audio Systems, Inc. offers a complete line of integrated professional audio products for the commercial recording, production, broadcast, live sound, and sound reinforcement markets. The company has a dedicated dealer network, intensive field training, and 24-7 tech support in the U.S. and Canada.

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June 2008
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