ClearOne comm AP400 operation manual Inputs A-D, Telco, Subbus, Echo canceller, NLP adjust, Gain

Installation ~ LCD Programming	25
Echo canceller

Activate or deactivate the echo cancellation feature for each gated input. Factory default is on.

NLP adjust

Non-linear processing (NLP) has four settings: soft (6 dB), medium (12dB), aggressive (18dB), and off. NLP adds additional echo cancelling “horsepower” to the echo canceller in difficult acoustic environments. Care should be taken when using NLP because of the corresponding trade-offs, which can include suppression and half-duplex operation. The factory default is soft.

Inputs A-D, Telco

The parameter submenus below this level control how inputs A, B, C, and D and Telco In deal with input audio. Three input parameters can be applied to the inputs: gain adjust, AGC and mute (see Figure 2.16).

Gain

This adjusts each input’s gain (ranging between -20dB and 20dB). In conjunction with the LCD readout and the LED bar graph, all gated inputs can be simply calibrated for the right level on the mix bus. The default setting is 0dB.

AGC

Each input can use automatic gain control (AGC). This feature keeps softer and louder input audio at a consistent level. This feature is disabled when shipped from the factory.

Mute

This parameter mutes a particular input channel.

Figure 2.16. Inputs A–D submenu

Subbus

The subbus parameter allows control of gain (attenuation) of mix audio from the microphones into the speaker audio. The attenuation can be adjusted in dB.

Gain

The subbus gain can be adjusted over a range of 0 to -20dB, in 1 dB increments. The default setting is -6dB.

Figure 2.17. Inputs A–D submenu

Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760