Frequently Asked Questions
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FAQ
How do I set up the Polycom ViewStation to work over IP?
Setting up the ViewStation on a T-1 connection:
Before placing the unit, consider these things:
1: IP addresses:
You must have a static IP available for use by the ViewStation. You can either statically assign the IP address to the ViewStation and place it right behind a router, or you can map a static to internal (public to private) address in your firewall and place the unit on the LAN behind your firewall (this of course is rather insecure and heavily dependent on your firewall if you're using one).
2: Make sure you have the following information available and it is accurate:
The subnet mask, the default gateway and the DNS server addresses.nc.
What can I do to make my projector lamp life last longer?
See our 'Helpful Hints for Projector Lamp Life' page for more information by clicking here.
What's a good screen size for my home theater setup?
10-feet back - 45x80" Screen
12-feet back - 52x92" Screen
15-feet back - 58x104" Screen
18-feet back - 65x116" Screen
20+ feet back - 81x144" Screen
(Note: This information also includes where you put your first row of theater seats.)
Where can I find information on replacing a projector lense?
A good website for getting information on a replacement lense is Navitar.
Is there a website that has owner's manuals for Sanyo LCD projectors?
On Sanyo's website there is a search function for the owner's manual PDF files.
What can I do to prevent high fail rates with CD duplication?
In most cases, high fail rates are due to the readability of your master disc, especially for high-speed duplication. We strongly recommend re-creating your master at a low speed, and using high quality blank media. Then, you can use the recreated disc to be the new master disc which should be used as the source to create duplications. This process is called Master Recreation and it will reduce the fail rate significantly.
Does the duplication speed affect the quality of the duplicated discs?
The higher the speed the more chances that there can be some quality drop-off. However, the amount of diminished quality is very minor and will not make a difference or be noticeable to most people.
What is the DVI connector?
Click here for an information page on DVI cables and the various DVI connectors.
What exactly is 3:2 Pulldown?
3:2 pulldown (technically, 2:3 pulldown)
The process of converting 24 frame/s material to 29.97 frame/s is known as 3:2 pulldown. It is accomplished in two steps. The first step is to slow down, or "pulldown" the film motion by 0.1%. This speed change is unnoticeable to the viewer, and makes the film travel at 23.976 frame/s.
The second step of the 3:2 pulldown is the 3:2 (or 2:3, see below) step. At 23.976 frame/s, there are 4 frames of film for every 5 frames of NTSC video:
These four frames are "stretched" into five by exploiting the interlaced nature of NTSC video. For every NTSC frame, there are actually two complete images or "fields," one for the odd-numbered lines of the image, and one for the even-numbered lines. There are, therefore, ten fields for every 4 film frames, and the telecine alternately places one film frame across two fields, the next across three, the next across two, and so on. The cycle repeats itself completely after four film frames have been exposed, and in the telecine cycle these are called the "A," "B," "C," and "D" frames, thus:
Note that the pattern in this example is actually 2-3, 2-3. The name "3:2 pulldown" is an archaic reference to the pattern that was used by older telecine equipment. The modern telecine uses a 2-3 technique.
What exactly is ESD and how can I prevent it?
ESD, or Electro Static Discharge, is one of the few things an individual can do to damage or destroy his or her computer or hardware components. Much like the shock you receive when rubbing your feet on the carpet and touching something metal, ESD can occur when working in your computer and will cause components you touch to no longer work properly. ESD can occur without the user feeling a shock and will only occur while working on the inside of the computer or handling an expansion card.
How to help prevent ESD:
The best method of preventing ESD is to use an ESD wrist strap and/or use a grounding mat or table. However, because most users do not have access to such items, we have included the below steps to help reduce the chances of ESD as much as possible.
- Zero Potential - Most importantly, make sure you and the computer are at Zero Potential by continuously touching an un-painted metal surface of the chassis or the computer power supply case.
- Standing - It is also very important that you are standing at all times when working on the computer.
- Cords - Make sure everything is removed from the back of the computer (power cord, mouse, keyboard, etc).
- Clothes - Make sure not to wear any clothing that conducts a lot of Electrical Charge, such as a wool sweater.
- Weather - Electrical storms can increase the ESD risk; unless absolutely necessary, try not to work on a computer during an electrical storm.
- Accessories - To help reduce ESD and help prevent other problem, it is also a good idea to remove all jewelry.
Damaged Hardware:
If after working inside your computer and/or adding additional hardware your computer no longer boots properly, please try the below recommendations.
If you have added a new component, remove it and try booting the computer. If the computer boots, it is likely an incompatibility between the computer and that hardware device. Try it again just to make sure.
If the computer still does not boot properly after removing the new hardware or you did not add any new hardware, make sure that all the cables are firmly connected to their devices. It is possible that a cable may have become loose. This also includes the cables going to the back of your computer; make sure your power, monitor, mouse, keyboard are connected.
Make sure each of the expansion cards in your computer are firmly seated into the slots and not partially seated.
Unfortunately, if your computer still does not properly boot, it is very possible that you may have mistakenly damaged your computer or a component within the computer causing it not to work. If the computer is beeping abnormally, refer to our beep code page for recommendations and beep code listings.
OSHA Permissable Sound Levels
The following is for both indoor and outdoor sound levels.
TABLE G-16 - PERMISSIBLE NOISE EXPOSURES (1)
| Duration per day, hours |
Sound level dBA slow response |
| 8 |
90 db |
| 6 |
92 db |
| 4 |
95 db |
| 3 |
97 db |
| 2 |
100 db |
| 1 1/2 |
102 db |
| 1 |
105 db |
| 1/2 |
110 db |
| 1/4 or less |
115 db |
Footnote(1) When the daily noise exposure is composed of two or more periods of noise exposure of different levels, their combined effect should be considered, rather than the individual effect of each. If the sum of the following fractions: C(1)/T(1) + C(2)/T(2) C(n)/T(n) exceeds unity, then, the mixed exposure should be considered to exceed the limit value. Cn indicates the total time of exposure at a specified noise level, and Tn indicates the total time of exposure permitted at that level. Exposure to impulsive or impact noise should not exceed 140 dB peak sound pressure level.
How do I get good TV reception in my area?
Good TV antenna selection is not based on distance from the transmitting station except in rural environments. Good reception is based on accurately characterizing signal conditions, and selecting an antenna that works in that situation.
That is why this antenna selection guide has been prepared by applying massive computing power to massive databases to compute antenna requirements in your neighborhood. Even with this amazing capability, assuring good TV reception requires attention to details in your neighborhood and proper installation.
Click here for the antenna reception locator.
How many lights do you need?
It depends on the size of your stage and the type of performance. It is also important to realize that the fewer lights you have, the more pronounced the shadows will be (and shadows, in general, are undesirable). A very basic number would be eight – four coming from each side of the stage.