The Feedback Destroyer uses a powerful signal processor combined with a patented algorithm to suppress acoustic feedback. It uses an echo cancellation and reverberation elimination algorithm to effectively filter out room reverberation, thereby eliminating acoustic feedback. By adding masking noise (inaudible noise) to the output signal, or shifting the frequency of the output signal by 5 Hz, the LBB Feedback Destroyer can detect the components of the signal that cause reverberation and remove them before feedback occurs, while keeping the original signal intact.
The adaptive filter can be switched between "fast" mode and "precise" mode. Fast mode is suitable for occasions where the microphone position changes frequently, such as in a discussion system with multiple switching microphones. Precise mode is suitable for occasions where the microphone position is fixed, such as a podium with a relatively stable acoustic environment. The adaptive filter converges at a slower speed, thereby suppressing more reverberation components. Up to 12dB of additional gain can be obtained before acoustic feedback occurs, depending on the acoustic environment and the selected operating mode. The LBB Feedback Suppressor also has a built-in automatic mixer to achieve two-way microphone input. In many cases, such as on a podium, podium or conference table, using two microphones can better capture the sound of a moving speaker, which often increases the risk of acoustic feedback. In view of this problem, the automatic mixer in the LBB Feedback Suppressor will automatically reduce the gain of the microphone with a weaker signal input, while increasing the gain of the other microphone with a stronger signal input. In this way, it can "track" the moving speaker and produce the best sound clarity. At the same time, since the total amount of gain is kept constant, the maximum gain headroom without causing acoustic feedback is maintained. The automatic mixer function still works even when the feedback suppressor is switched to "bypass" mode.
