What's AFC?FeaturesSystem ConfigurationTuningExamples and ProjectsReferencesAudio sampleContact us

Features



1.
Re-creation of natural reverberation based on the physical condition of the existing room by means of an acoustical feedback control

AFC is a control technology using acoustic feedback. It differs from many other sound field generating systems in that it enables you to improve important items concerning auditory impressions while maintaining the natural architectural sound that the room originally has.

Click on the screen to enlarge.



2.
Wide range controllability using FIR filters

AFC uses a FIR filter in feedback loop, which will provide you a wide range of control.
For example, as shown in the right figure, you can select extended reverberation time effects corresponding to energy increase and room size change.

Click on the screen to enlarge.



3.
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.

Click on the screen to enlarge.



4.
Stability against howling effect using time varying control

Despite being based on feedback, AFC can stably provide effects by using these 2 dynamic stabilizing systems: EMR(C) and Fluc-FIR(C). It is necessary to have a large amount of energy feedback for a system based on feedback to provide a large effect. The more you increase energy feedback, the more unstable the system will become as to howling.
The two dynamic stabilizing systems that the AFC system has generate stability against howling within the system by applying a time change to the feedback loop to flatten its frequency characteristics.

Click on the screen to enlarge.
Click on the screen to enlarge.



5.
Ease of operation.

AFC is operation-free. In other words, you need not have someone for system operation at all times. You can easily have a sound field improvement effect by just turning the power on and selecting the patterns.

Click on the screen to enlarge.


Copyright (C)2008 Yamaha Corporation. All rights reserved.



Back to Home YAMAHA Global Gateway AFC Active Field Control