Polycom EF2241 manual Definition of Terms

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DEFINITION OF TERMS

room gain of this microphone channel is said to be 0 dB. If the reflected signal picked up by the microphone is higher than the level of the signal sent to the line output to your amplifier, that microphone channel has positive room gain. The more positive the room gain, the harder the AEC must work to determine which signal is an echo and which is a local speech signal.

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VORTEX EF2241 Reference Manual

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Contents Vortex EF2241 Reference Manual Page Introduction Introduction Welcome How to Use This ManualProduct Features Product RegistrationProduct Inputs Outputs Remote Control What’s Not Included PRE-INSTALLATIONTools Needed for Installation What’s IncludedEF2241 Front and Rear Panels PRE-INSTALLATION North American Requirement InstallationConnecting the EF2241 to Other Equipment Mounting the EF2241Codec Typical EF2241 ConnectionsDevice IDS on the EF BUS Connecting Multiple Vortex DevicesTerminating the EF2241 Factory Default Settings PresetOff Presets Multiple Vortex Devices Pick a Standard Signal LevelCheck Surrounding Equipment Configure Program Audio Sources Input Settings Integrating the EF2241 Into Your SystemCalibration Set Levels on Line Input Channels Customize Setting for Your Particular Application SET UP the Phone InterfaceBuild Your Echo Canceller Reference Echo Canceller Reference for Multiple Vortex DevicesBus Reference Setting upAutomixer Parameters Configure the Automatic Microphone MixerGlobal Settings Channel Settings Automixer Settings for Multiple Vortex DevicesConfigure the Matrix Mixer Default SettingsBuilding Your System with Multiple Vortex Devices Assign Inputs Assign Outputs Configure the submatrixEF BUS Presets Other EF2241 FeaturesConfigure Your Echo Canceller Reference LCD Menu Tree LCD Menu StructureLCD Menu Structure System System MenuPhone Control Phone ControlInputs 1-4, T, A-D InputsAutomixer Menu OutputsGlobal Settings Mixer Settings Matrix Matrix MenuInput/Output EQ Channel Band Parametric EQ MenuMacros PresetsToo many microphones are gating TroubleshootingAutomatic Microphone Mixer No microphones are gating Some microphones are not gatingRoom Audio Sounds Choppy Echo Canceller ReferenceMatrix Mixer Residual EchoFinding the Source of Echo Room Gain Room Gain Excessive Room GainIn-Conference Quick Check Excessive Microphone Amplification Nonlinearity InsufficientEmail vortex@polycom.com Contacting Technical SupportTechnical Specifications Compliance USA and CanadaUS Telco requirements Canadian Telco Requirements Automatic Dialing Telco ConnectorRest of World AustraliaThis page was intentionally left blank CE Mark R& TTE Directive Vortex EF2241 Reference Manual Technical Support Noise and Reverberation Consider Room Gain Conference System DesignEN Echo Canceller, Noise Canceller EF2241 Block DiagramEF Bus Connector PinoutsInput/Output Remote Control Port Connecting Unbalanced RCA to Balanced Mini Phoenix Making AN EF BUS TerminatorInstructions Additional Notes RMA# Must be on package Warranty InformationState Law Rights What this warranty does not coverCrosspoint Mix Minus Bus Echo CancellerDefinition of Terms Acoustic EchoNOM NOM Attenuation NOM Bus Presets Room GainDefinition of Terms Index NOM Index Page 1725-80098-001-C