Integrator's Reference Manual for Polycom HDX ... - 1 PC Network Inc

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Integrator’s Reference Manual for Polycom HDX Systemsambient noise level). A room built to the description found elsewhere in thissection will usually fall between NC-30 and NC-35. The actual NC value is notcritical; what is important is that the room be built with the intent and carerequired to achieve the low noise rating. Typically in architectural design, asite evaluation and analysis are required to certify the noise performance of agiven space. The quieter the room, the easier it is to hear others in the sameroom as well as be heard by others who are participating via conferenceconnection to a far-end location (or locations).Almost every conference room of medium to large size (larger than 12’x15’)requires some level of acoustic treatment to provide good speech-rendering toother conference sites. The quality differences lie in the areas of intelligibilityand consistency of loudness as presented to the far-end. While the people atthe far-end may hear the sounds coming to them, it may be hard for themclearly to distinguish all of the vowels, consonants, inflections and nuances ofactual human speech communication. (We all know that it is not simply whatyou say but how you say it—i.e., the inflections and intonations—that makesthe difference in perceived meaning in human communications.)Good audio practice dictates that the treated surfaces be composed of at leasttwo nonparallel walls. And, as the VCS hardware is a potential source ofdistracting fan noises, the walls to be treated should include the wallimmediately behind the VCS hardware, whenever this hardware is within theconference room proper. To help prevent meeting audio from leaking intoadjoining hallways or offices, the walls along those areas also should betreated.Approximately 50 percent of the wall area needs be covered with acousticpanels. The type recommended is 1” thick compressed, dense-core fiberglass,fabric-covered, or equivalent, with a SABIN (sound absorption index) value of0.9 average. This specification is sometimes referred to as NRC (noisereduction coefficient). If reduction of sound passing through is required, thenan additional barrier layer is laminated to the dense-core material, usually3/8” thick fiber compression board. The barrier layer is placed against theexisting wall material, then the acoustic absorption panels are placed on theinterior-room side of that. The barrier panels will have a SABIN of 0.9, but willhave an additional specification of an STC (sound transmission coefficient) of20. STC is a measure of the amount of reduction in loudness of sound passingthrough the material. Having an STC rating of 20 means there is a factor of 10reduction in the amount of sound passing through that material. Ahigh-quality conference room wall usually has an STC of 60 or more—that is,less than 1/1,000 of the sound in the room leaks through the wall.Room LightingThe brightness of the lighting in a videoconference room plays an importantrole in determining the far-end view of the meeting. When there are low tomoderate amounts of light—20fc to 35fc (footcandles), typical officelighting—the distance range of “in focus” objects (depth-of-field) usually isA - 6
Room Design and Layoutonly 2’ or 3’ from nearest in-focus to furthest in-focus. With bright light (70fcor more) the range of in-focus objects can more than double. Participants at thefar-end will see more people in sharp focus, and the codec will have an easiertime encoding the image.Bright standard direct fluorescent lighting has the undesirable side effect ofbeing harsh for the local participants. In addition, the direct down lightingcasts significant “drop shadows.” The result is undue stress amongparticipants.The best plan for videoconferencing is to use indirect lighting for 80 to 85percent of the light, and evenly distributed direct lighting for the remaining 15to 20 percent. The indirect light will help minimize shadows on the faces of theparticipants, and make the room more comfortable for viewing the far-end onthe TV monitor. The direct light can be used to create backlight separationbetween foreground and background objects or surfaces.There should be not less than 55fc and ideally as much as 75fc of light (770lux)on the faces of the participants in the facial field as viewed by the camera in theconference space. The light should be completely even across the field ofmeasure or view, and of one consistent color temperature.To best meet these requirements, indirect fluorescent lighting most often isrecommended. This type of lighting works by using the upper walls andceiling as diffuse reflectors for the light. The usual recommended colortemperature for these is 3,000 to 3,800 degrees Kelvin. If there is a significantquantity of outdoor light entering the room, the lamps should be more than5,500 degrees Kelvin.Light FixturesThe light fixtures generally recommended for indirect lighting are availablefrom a number of manufacturers. They typically are three-tube, 8” ovalindirect up-lights, though they may take the form of chandelier-style pendantlights, wall sconces, cove lights or flushmounted specialized troughs. Manymanufacturers work closely with contractors and lighting designers to ensurethat the correct light levels and shadow-free zones are designed into the room,especially when used for videoconferencing. Lamps for these fixtures areavailable in a variety of specified color temperatures from numerousmanufacturers, including Sylvania, General Electric and Osram/Phillips.Indirect fixtures are available in a number of different designs or “looks,” andcan be purchased in configurations that will complement and not detract fromthe interior design of the space.Lighting layout recommendations and determination of the number offixtures needed are handled either by the architectural design firm or bysubmitting a complete floor plan, including reflected ceiling, walls andfurniture placement, to fixture vendors. The vendors will analyze the plansand return a finished lighting layout to the customer, detailing the number offixtures, placement and required wiring.A - 7
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