Noise Reduction reduces the level of relatively steady state noises like fans, lawn mowers, wind, and mains electrical hum. The more you turn it up, the more aggressively the residual echo is suppressed at the expense of distorting the Near-End microphone signal.Įnables and disables Residual Echo Suppression functionality of the AEC. This control determines how much any residual echo is suppressed. Residual Echo Suppression applies additional suppression to any residual echo that was not removed by the adaptive filter and echo reduction functions of the AEC component. In general, the Far-End reference signal level should approximately equal the Near-End microphone signal level, as indicated by 0dB on the Reference-to-Microphone Level Ratio meter. This knob adjusts, in dB, the Far-End reference signal level. The ratio can be adjusted using the Reference Gain knob.Īdjust the Reference Gain until the RMLR is at the target of 0dB. In general, the Far-End reference signal level should approximately equal the Near-End microphone signal level, as indicated by a ratio of 0dB. The RMLR meter is used to adjust the reference signal level during Far-End only talk. This meter indicates how much, in dB, the Far-End reference signal level exceeds the Near-End microphone signal level. Reference-to-Microphone Level Ratio (RMLR) Readings above 20 dB during Far-End only talk indicate that the AEC is working properly.īypasses the AEC function, including its latency, when activated. A reading below 10 dB during Far-End only talk may indicate that the room tail is longer than the AEC tail property. The ERLE meter is used to indicate how effective the AEC is in terms of suppressing the acoustic echo. This meter indicates how much, in dB, the Far-End echo arriving at the Near-End microphone is attenuated by the AEC adaptive filter once the filter has converged. Note: In most cases, this should be left at the default of 10dB to avoid distorting sound quality. Select the maximum level of noise reduction allowed with the Noise Reduction (NR) control. Select Yes to make the Reinforcement Output pin available, or No to hide it. Select Yes to have one input Reference signal shared by all channels. Likewise, an AEC channel with a Tale Length of 400ms requires four times the processing of one with a Tail Length of 100ms. Note that an AEC channel with a Tail Length of 200ms requires double the processing of one with a Tail Length of 100ms. Each Core has a set limit of channels you can use in a design. Selects the number of input channels available for the AEC. When the Tail Length is set to 400 ms, the channel count is doubled when calculating AEC Processing in Check Design (Shift+F6), which effectively cuts the number of available channels in half. Typically, you would use 200 ms, but for exceptionally reverberant rooms, you may want to use 400 ms. Tail length is the maximum room impulse response that the adaptive filter can model. For AEC best practices, refer to the QSC Quantum Level 1 Training Online. Tip: To learn more about AEC, see the Application Guide - Q-SYS Acoustic Echo Cancellation. To remove the echoes, the AEC subtracts a filtered version of the reference signal from the microphone signal. Each channel also receives the loudspeaker signal that carries the remote talker's voice. The purpose of the AEC is to eliminate these echoes while at the same time allowing the Far-End caller to hear clearly, what people in the room are saying.Įach microphone in the conference room is plugged into one channel of the Q-SYS AEC component. The sound is picked up by microphones in the conference room and echoed back to the Far-End caller. The remote caller's (Far-End caller's) voice is broadcast over loudspeakers in the conference room. The Q‐SYS multi‐channel Acoustic Echo Canceler (AEC) component is used in conference rooms (Near-End) and other installations where people call in from remote locations.
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