ClearOne comm GT1524 operation manual Inputs, Mic/Line, Aux In, 4-Wire In, and From Telco

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Installation ~ LCD Programming

11

Inputs

There are four main submenus under the Inputs menu tree: Mic/Line In, Aux In, 4

Wire In, and From Telco (see Figure 2.7).

Mic/Line In

Gain Adjust. This adjusts the Mic/Line In submenus, including the level for the

Input gain (ranging between -20dB and 20dB). The default setting is 0dB.

Mic/Line Input. This input defaults as a line-level input (0dB gain) but can be switched to a mic level input (55dB or 25dB gain).

Mute. This parameter mutes the input channel.

Phantom Power. Defaults with 24V phantom power disabled, but may be switched on to accommodate input devices requiring phantom power.

AGC. The input can use automatic gain control (AGC). This feature keeps softer and louder talkers at a consistent transmit level. This feature is disabled when shipped from the factory. The target gain is 0dB and adjusts at 2dB per second. The AGC start adjustment is -20dB, but will adjust only +6dB. Adjustments will not be made at .5dB on either side of the target (0dB).

High-Pass Filter. A high-pass filter may be selected on the Mic/Line input to reduce unwanted noise. The filter has a break frequency at 250Hz, and -3dB down at 200Hz, then rolls off at 6dB per octave. This feature is disabled when shipped from the factory.

Echo Canceller. Activate or deactivate the echo cancellation feature for this input.

Factory default is On.

NLP Adjust. Non-linear processing (NLP) has four settings: soft (6dB), medium (12dB), aggressive (18dB), and Off. NLP adds more echo cancelling “horsepower” in difficult acoustical environments. Use care when increasing NLP, because of the corresponding trade-offs which can include suppression and half-duplex operation. Factory default is Soft.

Aux In, 4-Wire In, and From Telco

Gain Adjust. This adjusts each Input gain (ranging between -20dB and 20dB) in conjunction with the LCD readout and the LED bar graph. The default setting is 0dBu.

Mute. This parameter mutes the input channel.

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

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Contents Audio Products GT1524 Single Channel Echo Canceller GT1524 Single Channel Echo Canceller GT1524 Installation ClearOne Part No June 2002 Rev Table of Contents IiiAppendices Features IntroductionProfessional Services Group Sales and Customer ServiceTechnical Support ClearOne Communications EuMEA GmbHControls and Connections UnpackingFront panel Rear panel Introduction ~ Controls and ConnectionsEquipment placement Operational RequirementsTelephone line requirements Introduction ~ Operational RequirementsTechnical Services Group ~ 1-800-283-5936 USA ~ Hardware Setup Connecting the unitLCD Programming Menu treesInstallation ~ LCD Programming Adjusting a valuePower-Up Screen Inputs Aux In, 4-Wire In, and From TelcoMic/Line Speaker/Line Out, 4 Wire Out, and To Telco OutputsSystem Aux OutRS-232 Set PasscodeTelco Timeout Default MeterMeters Unit ID NumberControlling volume To adjust the volumeFront Panel Control MutingDisconnecting a call Answering a callMaking a call Operation ~ Front Panel ControlCustom controller options Custom ControlOperation ~ Custom Control Technical Services Group ~ 1-800-283-5936 USA ~ Appendix a Specifications AppendicesControl/Status port pinout female Appendix B PinoutsRS-232 COM DCE port pinout female Appendix C Serial Commands Command structureError codes Appendix C ~ Serial CommandsGT1524 Serial Commands Explanation AGCReturn values Baud AuxmixDfltm ERL DialErle FPP FlowGain Appendix C ~ Serial Commands Example HookHookd LFPMHP LVLMline NLP MuteNull Ring RingenRxrd Return valueTerl TamodeTerle UID ToutVER Warranty This Warranty is Void ifFCC Part 15 compliance Appendix E ComplianceFCC Part 68 compliance Industry Canada compliance Appendix E ~ ComplianceLimits Index Index ~ S-Z
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