Automatic feedback suppressor for conference hall sound?

Yes, VISSONIC's automatic feedback suppressor uses DSP-based adaptive notch filtering to eliminate feedback in real-time without affecting overall sound quality.

The VIS-AFS Automatic Feedback Suppressor is designed specifically for conference and speech applications:

Adaptive DSP algorithm — automatically detects feedback frequencies and applies narrow notch filters (typically 1/10 octave) to suppress them, leaving the rest of the audio spectrum untouched

Multiple independent filters — can suppress several feedback frequencies simultaneously, which is important in rooms with complex acoustics

Fixed + dynamic modes — fixed filters lock onto persistent feedback frequencies (room resonances); dynamic filters handle transient feedback that occurs when a presenter moves near a speaker

Low latency — processing delay is minimal (< 1ms), so it doesn't create perceptible echo or lip-sync issues

Integration with a conference hall system:

Insert the AFS between the mixer output and the power amplifier input

During setup, run the automatic filter initialization (with pink noise or open mics) — the AFS learns the room's resonant frequencies

Fixed filters are set and saved; dynamic filters remain active during operation

For more comprehensive audio management, the dB-NET Digital DSP Audio Matrix (VIS-DSP series) includes built-in feedback suppression, EQ, compression, and matrix routing in one unit — a better choice if you need both feedback control and zone management.