TANDBERG 5000 user manual Noise Reduction, Echo Control

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Advanced use

VISION 5000 Videoconferencing System

Echo Control

========== Echo Control ==========

Mic1: Off On On+NR

Mic2: Off On On+NR

Mic3: Off On On+NR

Audio4: Off On On+NR Previous Menu

Each of the 3 microphone inputs and Audio input 4 have a separate echo canceller. One echo canceller per input provides more sophisticated control than having one common canceller for all microphones.

Echo control is normally set to On to prevent the remote site from hearing their own audio. Once selected On echo cancellation is active at all times. The echo canceller continously adjusts itself to the audio characteristics of the room and compensates for any changes it detects in the audio environment. If the changes in the audio conditions are very significant the echo canceller may take a few seconds to re-adjust.

You can choose to switch off the echo canceller for the available audio sources.

Echo Control

Echo Control should be switched OFF if external echo cancellation or playback equipment is used. Audio 5 and 6 do not have echo cancellation since these inputs are intended for audio playback equipment.

It is your echo canceller that improves the audio quality experienced by the other site. When you hear an echo of your own audio it is most likely the remote site’s echo canceller that is malfunctioning.

Noise Reduction

In addition to echo cancellation the system has built in noise reduction algorithms (NR).

NR reduces constant background noise (e.g. noise from air-conditioning systems, cooling fans etc.). In addition, a highpass filter (Humfilter) reduces very low frequency noise.

Choose On+NR to activate both Echo Control and Noise Reduction.

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Contents N D B E R G Vision 5000 Videoconferencing System Environmental Issues Lysaker, Norway, Tel +47 67 125 125, Fax +47 67 125Vision 5000 Videoconferencing System Operator Safety Summary Contents Vision 5000 Videoconferencing System Advanced use Ethernet FunctionalityPeripheral Equipment Appendices IndexHow to use this guide IntroductionMenu structure Vision 5000 on-screen menu structure is shown belowRight keys to move through the menu structure Main menuVision 5000 videoconferencing system At a glance the Vision 5000 systemCodec Vision 5000 Videoconferencing System CameraMonitors Remote control Vision 5000 Videoconferencing System CartTandberg AudioScience module optional Vision 5000 Videoconferencing System Table microphoneTandberg Natural Audio module optional on some systems Installation PrecautionsVision 5000 Videoconferencing System Installation This product complies with directives 89/366/EEC 93/261/EECUnpacking Installation Vision 5000 Videoconferencing SystemCamera Table Microphone Remote Control Batteries Connecting cables Isdn cables using BRI interfaceIsdn cable using the PRI/T1 interface Connecting to the Switched 56 networkPower on monitor Example 29 monitor not USAExample 33 monitor not USA Press OK to exit menuPower on codec To highlight Switch on with, select AV with + keysExample monitor USA Press p+s/tp- to select Special FUNCTIONS, then press OKConfiguration ISDN-BRI configurationISDN-PRI/T1 configuration External Network configurationBackground Environmental considerationsIris control and lighting Do not place the camera facing a doorway Loudspeaker volumeBrightness control Lighting Seating Area TableVision Getting started System start-upOn-screen help Vision 5000 Videoconferencing System Getting startedTo confirm the selection press OK BasicsGetting started Vision 5000 Videoconferencing System Video call Making and ending callsMaking a call Restricted call Telephone call SoftMux onlySpecial call prefixes Prefix Call TypeLast number redial/using the call directory Is switched off. See ‘Utilities’Correcting keying mistakes To answer a call, pressAdjusting volume General useView outgoing video General use Vision 5000 Videoconferencing SystemControlling the Main Camera Microphone on/offMoving the picture-in-picture PIP Camera Tracking To manually focus the Main Camera, use the Focus keysEnable/Disable Camera Tracking Selecting video sourcesSelecting audio sources Highlighter bar to a source and press OKStoring presets PresetsSelecting presets Requesting a still image Sending/receiving graphicsSending a still image Receiving a still image Source and 0 to view the still imageFar end camera control Fecc Advanced use GeneralAdvanced use Vision 5000 Videoconferencing System OverviewAll submenus are explained below Main menuMenu structure Video Call qualityAudio Video Mode AudioQuality MotionResolution Low resolution video 176 x 144 pixelsChannels Status FormatEdit directory Alphabetic SortBoth numbers should be specified 2x64 or 2x56 calls Add New EntryKey to delete the last character Store Last Number Utilities AutoanswerDo not disturb Far end camera controlPresentation Settings This menu allows setup of still-image/graphics transferMCU status line System NamePower up and system info View current settingsYou can test the different subsystems of the Vision Test subsystemStatus BRI Status PRI Comments Call status BRICall status PRI Most common cause codes for Isdn are Cause codesMCU services Request floorTerminal ID Chair controlTake chair Release chairAllows the chairman to release the floor Allows the chairman to terminate the conference altogetherAudio setup Audio InputsMic1 +3.0dB Mix ModeLevel Settings Inputs Level Settings Outputs If an output is ‘Off’, no audio will be sent to that outputNoise Reduction Echo ControlTips for improving the echo canceller performance Alert Speaker Alert Tones & VolumeRestore Audio Defaults Enter a video source name Camera Track ModeVideo input Camera adjustments Keys on the remote controlFocus BacklightVision 5000 Videoconferencing System Advanced use Brightness WhitebalanceVideo output ISDN-BRI ISDN-PRI/T1 External Terminal settingsNetwork configuration Etsi Euro Isdn Isdn switch typeNtsc version is shown below Number Line Setup Number2Advanced Isdn settings SubaddressDefault Call Type MSN Multi Subscriber NumberParallel dial DownspeedCable Length 1&2 NumberMax Channels Type Manufacturer PRI Switch Type setting PRI Switch TypeAT&T Isdn National Isdn Channel HuntingCall control RS366 Dialling Leased Line Data Triggered ManualRS449/V35 Compatible #008 8B call Bonding #003 #006 6B call Bonding #002Dataport configuration Dataport9600 NoneData mode Control modeModem mode Dataport 1 supports 4 different modes Control Modem 120Restore defaults TCP/IP Settings IP-assignmentIP-address IP-subnet maskWhat is needed Ethernet FunctionalityWWW-interface Ethernet Vision 5000 Videoconferencing SystemVision 5000 Videoconferencing System Ethernet How is it done Peripheral Equipment Peripherals Vision 5000 Videoconferencing SystemInterfaces Vision 5000 Videoconferencing System PeripheralsVideo Inputs Video OutputsDual Monitor optional Please contact your dealer for further information Natural Audio module optionalAudioScience module optional Multiple controllable cameras optional Tracker optionalDocument camera VCR Recording Video Cassette Recorder VCRVCR Playback Telephone Add-On Extra camerasPC applications VGA to PAL converterOther PC applications VGA PAL/NTSC converterAdditional microphones Appendices Appendix Vision 5000 Videoconferencing SystemUsing Telesync TS-256 SW56/ISDN adapter Vision 5000 Videoconferencing System AppendixConfiguration of Vision VisionINC DSU Appendix 3 Connecting Vision 5000 to PRI/T1 Using CSU adapterConfiguration ofAdtran T1 ESF Csuace Making a callPower Appendix 4 LED indicationIndex Vision 5000 Videoconferencing System SymbolsIndex Vision 5000 Videoconferencing System Index ImuxIndex Vision 5000 Videoconferencing System