ClearOne comm AP400 Phantom Power, High-Pass Filter, EQ Status, Chairman Mic, Adaptive Ambient

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24	Installation ~ LCD Programming

Phantom Power

Each input will default with 24V phantom power enabled, but can be switched off to accommodate input devices not requiring phantom power.

AGC

Each 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. It adjusts at 2dB per second. The AGC start adjustment is +20dB, but will adjust only +6dB. Adjustments will not be made at .5dB either side of the target (0dB).

High-Pass Filter

A high-pass filter can be selected on each gated input to reduce unwanted noise. The filter has a break frequency at 250Hz, suppresses the signal -3dB at 200Hz, then rolls off at 6dB per octave. This feature is disabled when shipped from the factory.

EQ Status

A graphic equalizer can be enabled (on) or disabled (off) for each input. The equalizer helps match characteristics of dissimilar microphones and adjust general circuit tuning. This EQ circuit provides 12dB of cut or boost centered at frequencies of 250Hz, 1kHz and 4kHz, Q factor of 1.4. This feature is disabled when shipped from the factory. The levels of each band can be adjusted through the RS-232 port with the MEQ command or in AP-Ware.

Chairman Mic

Each input can be selected as the chairman override microphone, allowing the chairman’s microphone to gate on, regardless of which other microphones are on. As shipped from the factory, this feature is disabled. This feature can have a single microphone selected or a group of microphones selected.

Figure 2.15. Adaptive ambient

Adaptive Ambient

The adaptive ambient mode can be turned on (default) and off. The recommended setting is on. However, if the ambient noise in the room is constantly changing and the AP400 is unable to track properly (see Figure 2.15), turn this mode off and set the ambient level manually (see Manual Ambient, page 21). Fixed values range from 0dB to -70dB, with increments of 1dB.

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

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Contents AP400 Audio Conferencing System AP400 Installation ClearOne Part No July 2002 Rev Table of Contents IiiOperation AP-Ware SoftwareAppendices Introduction Product OverviewFeatures Professional Services Group Sales and Customer ServiceTechnical Support ClearOne Communications EuMEA GmbHControls and Connections UnpackingFront panel Rear panel Introduction ~ Controls and ConnectionsLink Network Link busIntroduction ~ G-Link Networking Bus Link EC Reference busControl bus NOMTechnical Services Group ~ 1-800-283-5936 USA ~ Equipment Requirements Hardware Setup AP400 installation diagramInstallation ~ Hardware Setup Connecting the unitTo connect the AP400 Installation ~ Networking Units Networking UnitsLink connections To create a G-Link networkMixer mode Device IDsTo set the device ID Device typesErrors To set mixer modeEC reference Installation ~ LCD Programming Switching from one main menu category to anotherLCD Programming Menu treesAdjusting a value LCD menu treeSelect preset System parametersLock panel Set passcodeMixer mode Device IDUnit ID Gate parametersFirst mic priority Last Mic ModeGate Ratio Off Attenuation Hold TimeDecay Rate Manual AmbientTo determine ambient level Combination ChannelsInstallation ~ LCD Programming RS-232 Input parameters Installation ~ LCD Programming TelcoInputs Phantom Power High-Pass FilterEQ Status Chairman MicEcho canceller NLP adjustInputs A-D, Telco SubbusRouting parameters Output parametersOutput 1-4, Output A-D, Telco Link X-Z buses Installation ~ LCD Programming SubbusEC reference and PA Link reference Slave unitMeter parameters Default MeterInputs, Outputs, ERL/TERL, and ERLE/TERLE Installation ~ Worksheet AP-Ware software requirements Description64MB RAM Installing AP-Ware To install AP-WareControlling the volume To adjust the volumeFront Panel MutingTelco Interface To make and disconnect a callTo mute or unmute an output InstructionsOther telco options ControllersCustom control through DB-25 port Operation ~ ControllersTouch panel control Appendix a Specifications AppendicesWarranty Appendix B Warranty and ComplianceThis warranty is void if FCC Part 15 Compliance Appendices ~ Appendix B Warranty and ComplianceFCC Part 68 Compliance Industry Canada Compliance Safety Information Appendix C Connector Pinouts Appendices ~ Appendix C Connector PinoutsRS-232 COM DCE port pinout Control/Status port pinoutAppendix D Accessories Appendix E Serial CommandsAppendices ~ Appendix D Accessories Accessory ClearOne Part NumberCommand Syntax Error CodesMref DeviceAppendices ~ Appendix E Serial Commands Figure E.1. AP400 Serial CommandsSerial Command Parameters Explanations AambExplanation Return ValuesAGC Device ADDevice AGC CH CH= A-DAmblvl BaudBYE ChairoDial DecayDfltm Erle ERLFMP FlowFPP Gain ExamplesMicrophone gating key ExampleGmode GratioHold HookHookd LFPLMO LVLMdmode MasterMEQ Minit MHPMline Mmax MpassMtrx Input Input word assignmentOUTPUTMIXNote OutputmixReturn Values Device Mute CH W Device NLP CH Mute NLP=NULL NOM OffaNull PAAExample Preset Preset RefselRing RxrdTamode Return ValueTerl TerleUID ToutAppendix F Worksheets Figure F.1. Routing matrix worksheetAppendices ~ Appendix F Worksheets Figure F.2. Programming worksheetFigure F.3. Audio flow block diagram Index DSPIndex ~ P-Z