Yamaha MY4-AEC MY4-AEC Owners Manual - Page 7

MY4-AEC Signal Flow The local and remote locations in a teleconferencing system are referred to as the "near end" and "far end", respectively. The MY4-AEC acoustic echo canceller (AEC) works by comparing the reference signal received from the far-end with the signal from the microphone in order to determine which components of the signal are echo, and then subtracts only the far-end echo component from microphone signal. The near-end sound is thus clearly transmitted to the far end without echo. From Far-end A NR From Far-end B NR From Far-end C NR From Far-end D NR Matrix Router Far-end Voice A Far-end Voice B Far-end Voice C Far-end Voice D To Far-end 4 NR AEC Near-end Mic. 4 FBS Near-end Voice 4 To Far-end 3 NR Near-end Mic. 3 AEC FBS Near-end Voice 3 To Far-end 2 NR AEC Near-end Mic. 2 FBS Near-end Voice 2 To Far-end 1 NR AEC Near-end Mic. 1 FBS Near-end Voice 1 Reference signal FBS: Feedback suppressor NR: Noise reduction MY4-AEC Owner's Manual 7