Active Field Control
Active Field Control (AFC) is an acoustic conditioning system designed to adjust and enhance the architectural acoustic characteristics of facilities
For over 125 years YAMAHA craftsmen have created some of the world’s finest musical instruments. Superior sound quality has always been the driving force behind all of Yamaha's efforts. Whether manufacturing instruments, developing state-of-the-art audio technologies or designing performance halls and theatres, Yamaha is always seeking new ways to deliver the best possible listening experience.
First implemented by Yamaha in 1985, Active Field Control (AFC) is an acoustic conditioning system designed to adjust and enhance the architectural acoustic characteristics of facilities such as performance arts venues, houses of worship, theatres and concert halls—while maintaining the natural sonic characteristics of the space.
AFC3 represents the third generation of innovative Active Field Control (AFC) systems from Yamaha, the most trusted name in audio.
With increasing pressure for facilities to become more multi-purpose and accommodate a wider range of applications AFC3 provides a cost-effective alternative to mechanical means of modifying room acoustics. A truly scalable solution which can be installed in a wide range of venues AFC3 makes it possible to hold classical concerts in a very large hall without a sound reinforcement system, to accommodate an organ in a small church, or to enhance crowd response in a stadium. Reverberation changes can be made at the push of a button, allowing the performance environment to be adjusted almost instantly. In addition AFC3 is able to deliver the same high-quality sonic experience to every performer and member of the audience.
What is AFC ?
Active Field Control is an acoustic enhancement system that is used to improve or enhance the architectural acoustic characteristics of a room and optimize reverberation while preserving that room's natural acoustic ‘signature’. Yamaha DSP technology ena...
What is AFC ?
Active Field Control is an acoustic enhancement system that is used to improve or enhance the architectural acoustic characteristics of a room and optimize reverberation while preserving that room's natural acoustic ‘signature’. Yamaha DSP technology enables us to realize this system with a small set of core devices.
AFC adjusts acoustical conditions by using an acoustical feedback system which makes AFC different from, and superior to, other techniques that are based on the use of digital reverbs to simulate room characteristics.
Increasing the sound energy density can extend the reverberation time in a room.
AFC utilizes the acoustical feedback of a system to increase the energy density of diffused sound. Reverberation time and sound energy density can be controlled with transparency while preserving the original acoustical characteristics of a room.
This technique distinguishes AFC from other enhancement systems.
EMR (Electronic Microphone Rotator)
Since AFC utilizes acoustical feedback, it is essential to prevent coloration problems caused by a closed loop condition and maintain a stable system. In order to ensure controlled loop gain and a sufficient margin against instability, AFC implements a special patented technique called Electronic Microphone Rotator (EMR).
Wide Range Controllability using FIR Filters
AFC uses an FIR filter in the feedback loop which provides one of the controls of the AFC enhancement process. For example, by adjusting the gain of the FIR taps, the system will adjust the energy added back to the room in the feedback loop, changing the effective absorption of the room / system and resulting RT.
Effectiveness Independent of Source and Receiver Position in the Room
AFC brings effective results to the entire targeted room by using a feedback loop-based control.
AFC3 Core Unit
The AFC3 core unit is based on Yamaha’s well-known DME64N digital mixing engine. The enhanced AFC3 version of this processor includes the expected matrix mixers, delay lines, parametric EQ’s, and routing functions as well as specialized DSP components developed specifically for AFC applications. While one card slot of the AFC3 processor hosts a card dedicated to the FIR processing functions, the remaining three MY-card slots provide the fi rst 22 channels of outputs to the AFC system. Additional AFC3 units may be added and linked to the master unit for additional outputs.
AFC FIR Card
The AFC-FIR card is used to realize the high density of FIR processing that was not previously possible. AFC3 systems with the AFC-FIR card are capable of working with FIR filter sets that contain 125 times as many taps as previous AFC systems. This increase in the size and density of the FIR filter sets available make it possible to achieve much longer increases in a room's natural reverberation time without unnatural sounding artifacts.
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