Cisco Systems C90 Audio Input Line 1..4 Channel, Audio Input Microphone 1..8 EchoControl Mode

Cisco TelePresence System Codec C90 and Profile 65” Dual using C90 Administrator guide

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Audio Input Line [1..4] Channel

Define whether the Audio Line input is a mono signal or part of a multichannel signal.

Requires user role: ADMIN

Value space: <Left/Right/Mono>

Left: The Audio Line input signal is the left channel of a stereo signal.

Right: The Audio Line input signal is the right channel of a stereo signal.

Mono: The Audio Line input signal is a mono signal.

Example: Audio Input 1 Channel: Left

Audio Input Microphone [1..8] EchoControl Mode

The echo canceller continuously adjusts itself to the audio characteristics of the room and compensate for any changes it detects in the audio environment. If the changes in the audio conditions are very significant the echo canceller may take a second or two to re-adjust.

Requires user role: ADMIN

Value space: <On/Off>

On: Echo Control is normally set to On to prevent the far end from hearing their own audio. Once selected, echo cancellation is active at all times.

Off:Echo Control should be switched Off if external echo cancellation or playback equipment is used.

Audio Input Line [1..4] Level

Define the audio level of the Line input connector, in steps of 1dB.

See the Audio Level tables in the Physical Interfaces Guide for the codec for a complete overview of the menu values represented in dB.

Requires user role: ADMIN

Value space: <0..24>

Range: Select a value from 0 to 24dB.

Example: Audio Input Line 1 Level: 10

Audio Input Line [1..4] LoopSuppression

The loop suppression functionality detects whether a delayed signal loop is present from an audio Line output to an audio Line input on the codec. If a loop is detected the unwanted feedback is suppressed.

NOTE: Only loops between line output 3 and line input 3, and between line output 4 and line input 4 are suppressible.

Requires user role: ADMIN

Value space: <On/Off>

On: Activate Loop Suppression.

Off:Deactivate Loop Suppression.

Example: Audio Input Line 3 LoopSuppression: On

Example: Audio Input Microphone 1 EchoControl Mode: On

Audio Input Microphone [1..8] EchoControl NoiseReduction

The system has a built-in noise reduction which reduces constant background noise (e.g. noise from air-conditioning systems, cooling fans etc.). In addition, a high pass filter (Humfilter) reduces very low frequency noise. NOTE: Requires the Echo Control Mode to be enabled for the microphone.

Requires user role: ADMIN

Value space: <On/Off>

On: The Noise Reduction should be enabled in the presence of low frequency noise.

Off:Turn off the Noise Reduction.

Example: Audio Input Microphone 1 EchoControl NoiseReduction: On

Audio Input Microphone [1..8] EchoControl Dereverberation

The system has built-in signal processing to reduce the effect of room reverberation. NOTE: Requires the Echo Control Mode to be enabled for the microphone.

Requires user role: ADMIN

Value space: <On/Off>

On: Turn on the dereverberation.

Off:Turn off the dereverberation.

Example: Audio Input Microphone 1 EchoControl Dereverberation: On

Audio Input Line [1..4] Mode

Set the audio input line mode.

Requires user role: ADMIN

Value space: <On/Off>

On: Enable the Audio Line input.

Off:Disable the Audio Line input.

Example: Audio Input Line 1 Mode: On

Audio Input Microphone [1..8] Equalizer ID

Select the audio input microphone equalizer ID.

Requires user role: ADMIN

Value space: <1..14>

Range: Select Equalizer ID 1 to 14.

Example: Audio Input Microphone 1 Equalizer ID: 1

D14635.05 Profile C90 and Codec C90 Administrator Guide TC4.1, February 2011.	34	www.cisco.com
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