Phantom Power, High-Pass Filter, EQ Status | ClearOne comm AP400

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

Contents

AP400 Audio Conferencing System AP400 Installation ClearOne Part No July 2002 Rev Table of Contents Iii Operation AP-Ware SoftwareAppendices Introduction Product Overview Features Professional Services Group Sales and Customer ServiceTechnical Support ClearOne Communications EuMEA GmbH Controls and Connections UnpackingFront panel Rear panel Introduction ~ Controls and Connections Link Network Link bus Introduction ~ G-Link Networking Bus Link EC Reference busControl bus NOM Technical Services Group ~ 1-800-283-5936 USA ~ Equipment Requirements Hardware Setup AP400 installation diagram Installation ~ Hardware Setup Connecting the unitTo connect the AP400 Installation ~ Networking Units Networking UnitsLink connections To create a G-Link network Mixer mode Device IDsTo set the device ID Device types Errors To set mixer modeEC reference Installation ~ LCD Programming Switching from one main menu category to anotherLCD Programming Menu trees Adjusting a value LCD menu tree Select preset System parametersLock panel Set passcode Mixer mode Device IDUnit ID Gate parameters First mic priority Last Mic ModeGate Ratio Off Attenuation Hold Time Decay Rate Manual AmbientTo determine ambient level Combination Channels Installation ~ LCD Programming RS-232 Input parameters Installation ~ LCD Programming TelcoInputs Phantom Power High-Pass FilterEQ Status Chairman Mic Echo canceller NLP adjustInputs A-D, Telco Subbus Routing parameters Output parametersOutput 1-4, Output A-D, Telco Link X-Z buses Installation ~ LCD Programming SubbusEC reference and PA Link reference Slave unit Meter parameters Default MeterInputs, Outputs, ERL/TERL, and ERLE/TERLE Installation ~ Worksheet AP-Ware software requirements Description64MB RAM Installing AP-Ware To install AP-Ware Controlling the volume To adjust the volumeFront Panel Muting Telco Interface To make and disconnect a callTo mute or unmute an output Instructions Other telco options ControllersCustom control through DB-25 port Operation ~ Controllers Touch panel control Appendix a Specifications Appendices Warranty 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 pinout Appendix D Accessories Appendix E Serial CommandsAppendices ~ Appendix D Accessories Accessory ClearOne Part Number Command Syntax Error CodesMref Device Appendices ~ Appendix E Serial Commands Figure E.1. AP400 Serial Commands Serial Command Parameters Explanations AambExplanation Return Values AGC Device ADDevice AGC CH CH= A-D Amblvl BaudBYE Chairo Dial DecayDfltm Erle ERL FMP FlowFPP Gain ExamplesMicrophone gating key Example Gmode GratioHold Hook Hookd LFPLMO LVL Mdmode MasterMEQ Minit MHPMline Mmax MpassMtrx Input Input word assignment OUTPUTMIXNote OutputmixReturn Values Device Mute CH W Device NLP CH Mute NLP=NULL NOM OffaNull PAA Example Preset Preset Refsel Ring RxrdTamode Return Value Terl TerleUID Tout Appendix F Worksheets Figure F.1. Routing matrix worksheet Appendices ~ Appendix F Worksheets Figure F.2. Programming worksheet Figure F.3. Audio flow block diagram Index DSP Index ~ P-Z