Types
There exist different types of acoustic enhancement systems: In-line and feedback systems with or without electronic reverberators.
In-line systems are also called non-regenerative (i.e. no feedback). Feedback systems are also called regenerative. Electronic reverberators can be added in addition using various methods such as convolution and FIR filtering.
In-line systems with electronic reverberators: In-line acoustic enhancement systems include E-coustic LARES (Lexicon Acoustic Reinforcement and Enhancement System), SIAP, the System for Improved Acoustic Performance and ACS, Acoustic Control Systems. These systems use microphones, digital signal processing "with delay, phase, and frequency-response changes," and then send the signal "... to a large number of loudspeakers placed in extremities of the performance venue." The Deutsche Staatsoper in Berlin and the Hummingbird Centre in Toronto use a LARES system. The Ahmanson Theatre in Los Angeles, the Royal National Theatre in London, and the Vivian Beaumont Theatre in New York City use the SIAP system.
Feedback systems with electronic reverberators: Feedback acoustic enhancement systems include Meyer Constellation (formerly VRAS) (Variable Room Acoustics System) which uses "...different algorithms based on microphones placed around the room." Yamaha's AFC3 Active Field Control system which "enhances the architectural acoustic characteristics of a room and optimizes reverberation time performance." Also XLNT's MCR system (Multiple Channel Reverberation).
Feedback systems without electronic reverberators: CARMEN developed by CSTB comprises a number of electro acoustic active cells (approximately from 16 to 40), each of them being composed of a microphone, an electronic filtering unit, a power amplifier and a loudspeaker. Placed around the walls and ceiling of the auditorium, the cells form virtual walls depending on the architecture and the acoustic problem to solve. They only communicate between each other by the acoustic way. Another newer variant for smaller halls is CARMENCITA.
Read more about this topic: Acoustic Enhancement
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