NEC 128 manual Phone-LikeDialing, local-endcan set far-endpresets, Camera Control, Echo Canceller

Introduction 1-3

Phone-Like Dialing

•VoicePoint+ connectivity for ease of dialing

For those not wanting to dial using the VisuaLink remote, an NEC VoicePoint+ can be connected to the VisuaLink. (The VoicePoint+ is a tabletop speakerphone unit for conferencing; providing standard keypad, built-in microphone and speaker.) With a VoicePoint+, dialing is as easy as placing a regular phone call. A standard analog phone set can also be used with VisuaLink.

To make dialing even easier, VisuaLink provides 130 speed-dial settings. Up to 130 most often used numbers for a videoconference can be preset in VisuaLink. For easy redial, 20 redial numbers are automatically stored for both incoming and outgoing calls

•local-end can set far-end presets

Camera Control

Nine different camera presets can be stored in VisuaLink. The presets allow camera position (pan & tilt), framing (zoom), and automatic focus for various positions in a videoconference. To make this easier, camera presets are stored under identifiable names. With this capability, each preset can store different camera settings matched to each named individual in the conference.

A standard feature of VisuaLink is camera voice tracking. Voice tracking automatically moves the camera to the person speaking by using one of the camera presets. Voice tracking automatically detects the audio from a person (from one of three microphones) and selects the preset stored for that person. The camera will then pan, tilt, zoom, and focus (using the preset) to show the person speaking. No longer is a videoconference technician needed to operate a camera controller or video switcher.

Echo Canceller

• connect up to 3 microphones

Voice quality is an important component in videoconferencing. Users will tolerate degraded video, but not degraded audio. The echo canceller improves audio voice quality by eliminating signal echo from long line communications and clipping caused by some narrow band systems.

•settings for higher frame rate for smoother motion, or lower frame rate for higher resolution

H.320 Videoconferencing Compliance

VisuaLink is designed to the International Telecommunications Union (ITU-T) H.320 standard for videoconferencing. Many claim to support this standard, but few products support all options of H.320.

VisuaLink is designed to fully support the H.320 standard. This overall standard includes the new option H.263 video standard for higher resolution low bandwidth processing; and the H.261 video standard for lower resolution high bandwidth processing (for compatibility with older systems). Also supported are the standards G.711, G.722, and G.728 for the audio element of videoconferencing.

VisuaLink incorporates the latest H.320 technology available and provides backward compatibility in one compact unit. (For additional information on H.320, see Part 3 of this manual: Technical Description - more on H.320 Videoconferencing.)

VisuaLink 128/384 General Description