ClearOne comm AP400 Decay Rate, Manual Ambient, To determine ambient level, Combination Channels

Page 25

Installation ~ LCD Programming

21

Figure 2.12. Decay rate

Decay Rate

This feature determines how fast a microphone gates off after the hold time expires (see Figure 2.12). Three options are available for this feature: slow (default), medium, and fast.

If your room has very low ambient noise, set the value to fast. This reduces the effects of echo and reverberation. If you hear ambient noise “swoosh down” while the microphones decay, set this value to either medium or slow.

Manual Ambient

This setting is relevant only if the adaptive ambient mode is off on a mic channel (see Adaptive Ambient on page 24). Best results are usually achieved when the adaptive ambient mode is on. However, if you need to set the ambient level to a fixed value, turn off the adaptive ambient mode on the desired microphone channels. A manual ambient setting is a global setting and will affect all mics equally which are set to adaptive ambient off. The ambient level ranges from 0dB to -70dB. The default setting is -30dB.

To determine ambient level

1.Check your current gate ratio from the Gate Parameters menu. Make a note of the value. Example: “Gate Ratio: 15.”

2.Select Manual Ambient from the Gate Parameters menu. Press Enter to change the dB value.

3.Scroll up or down through the dB values until the mic gates on (gating is indicated when the mic LED lights up). Individual room conditions will determine whether you need to scroll up or down. When the LED flickers, the dB value indicated on the LCD display is the ambient level of the room.

4.Deduct the gate ratio value from the ambient level value you have just determined. For example, if the ambient noise level of the room is identified as -50dB and the gate ratio is 15, the manual ambient setting would be -35dB.


Any	combination		of
✍ channels		can be set in
adaptive		ambient	or
manual ambient		modes.	Only

individual channels cannot be set with both modes active.

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

Image 25

Contents AP400 Audio Conferencing System AP400 Installation ClearOne Part No July 2002 Rev Iii Table of ContentsOperation AP-Ware SoftwareAppendices Product Overview IntroductionFeatures Sales and Customer Service Professional Services GroupTechnical Support ClearOne Communications EuMEA GmbHControls and Connections UnpackingFront panel Introduction ~ Controls and Connections Rear panelLink bus Link NetworkLink EC Reference bus Introduction ~ G-Link Networking BusControl bus NOMTechnical Services Group ~ 1-800-283-5936 USA ~ Equipment Requirements AP400 installation diagram Hardware SetupInstallation ~ Hardware Setup Connecting the unitTo connect the AP400 Networking Units Installation ~ Networking UnitsLink connections To create a G-Link networkDevice IDs Mixer modeTo set the device ID Device typesErrors To set mixer modeEC reference Switching from one main menu category to another Installation ~ LCD ProgrammingLCD Programming Menu treesLCD menu tree Adjusting a valueSystem parameters Select presetLock panel Set passcodeDevice ID Mixer modeUnit ID Gate parametersFirst mic priority Last Mic ModeGate Ratio Hold Time Off AttenuationManual Ambient Decay RateTo determine ambient level Combination ChannelsInstallation ~ LCD Programming RS-232 Input parameters Installation ~ LCD Programming TelcoInputs High-Pass Filter Phantom PowerEQ Status Chairman MicNLP adjust Echo cancellerInputs A-D, Telco SubbusRouting parameters Output parametersOutput 1-4, Output A-D, Telco Link X-Z buses Installation ~ LCD Programming SubbusEC reference and PA Slave unit Link referenceMeter parameters Default MeterInputs, Outputs, ERL/TERL, and ERLE/TERLE Installation ~ Worksheet AP-Ware software requirements Description64MB RAM To install AP-Ware Installing AP-WareTo adjust the volume Controlling the volumeFront Panel MutingTo make and disconnect a call Telco InterfaceTo mute or unmute an output InstructionsControllers Other telco optionsCustom control through DB-25 port Operation ~ ControllersTouch panel control Appendices Appendix a SpecificationsWarranty 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 Appendices ~ Appendix C Connector Pinouts Appendix C Connector PinoutsRS-232 COM DCE port pinout Control/Status port pinoutAppendix E Serial Commands Appendix D AccessoriesAppendices ~ Appendix D Accessories Accessory ClearOne Part NumberError Codes Command SyntaxMref DeviceFigure E.1. AP400 Serial Commands Appendices ~ Appendix E Serial CommandsAamb Serial Command Parameters ExplanationsExplanation Return ValuesDevice AD AGCDevice AGC CH CH= A-DBaud AmblvlBYE ChairoDial DecayDfltm ERL ErleFMP FlowFPP Examples GainMicrophone gating key ExampleGratio GmodeHold HookLFP HookdLMO LVLMdmode MasterMEQ Minit MHPMline Mpass MmaxMtrx Input Input word assignmentOUTPUTMIXNote OutputmixReturn Values Device Mute CH W Device NLP CH Mute NLP=NULL Offa NOMNull PAAExample Preset Refsel PresetRxrd RingTamode Return ValueTerle TerlUID ToutFigure F.1. Routing matrix worksheet Appendix F WorksheetsFigure F.2. Programming worksheet Appendices ~ Appendix F WorksheetsFigure F.3. Audio flow block diagram DSP IndexIndex ~ P-Z