Beginners Guide To Projectors

So you’ve decided you want a projector, but you don’t know where to begin? Don’t panic, in reality, there are only a few simple decisions you need to make, to know what projectors will be right for you. Before you begin, you want to decide whether you will be using your new projector for displaying movies, playing video games, or giving presentations. This will affect how bright or dark your viewing room is and what resolutions you need, plus things like connection options. Also work out where you want to place your projector relative to its screen.

To begin with, you will need to consider brightness and contrast. Most projectors have their brightness stated in two ways, Lumens and foot-Lamberts. Sadly the Lumen rating is not a really useful gauge of brightness, as it often does not take into account the viewing size of the final image or reduction due to normal rather than max usage. In dark conditions such as a dedicated home theatre room, look for a brightness rating of around 40 fL, and increase it depending on how much extra ambient light your viewing room will have.

Contrast is often a more useful measure of projector quality than brightness. A high-quality projector will have a contrast ratio of 5,000:1 or more, all though check to see if the projector uses a “dynamic iris” to help boost its contrast range. These work by restricting the light output in dark scenes, allowing the projector to produce “blacker blacks”. Many such projectors will also just quote “on/off” contrast, which is the difference between a full black and full white screen. A better measure is ANSI contrast, which uses a chequered test pattern, and measures the difference between the light and dark squares. This value will be unaffected by any dynamic iris, and is usually a lower value.

Next you need to think about the supported resolutions you want to display. The very best is 1080p,so called “full HD”, and will allow you to display Blu-Rays and other high-definition content properly. Most games and computer presentations will only need 720p or 1024×768 resolution, so if you won’t be primarily watching movies, save some money and go for a lower-spec model. 1080p and 720p are both 16:9 widescreen resolutions, whereas 1024×768 is 4:3, which is a more square standard used by many computer monitors and older TV’s. Consider the screen you will be displaying on. To get full use of the screen, make sure it’s resolution matches that of your projector.

Finally, make note of the “throw distance” of the projector. “Short Throw” projectors are designed to be placed closer to the screen and still produce a big image, whereas “long throw” projectors are the opposite. Also quoted will be the amount of zoom available, which will allow you to grow or shrink the image somewhat. Another useful feature on most projectors is lens-shift. This will allow you more flexibility in placing the projector relative to the screen by enabling you to move the image up and down or left and right by a certain amount without distorting the image.

Introduction To Home Theatre Audio

Many filmmakers say that what’s on the screen is only half the movie, the other half is to be found in the soundtrack, carefully crafted by talented composers and musicians to elicit emotions of excitement, fear, sadness and joy in the viewer. Once of the major benefits of watching moves on DVD or hi-def formats is the availability of faithful reproductions of the multi-channel sound that can, when fed through a reasonable home system, sound even better than in many modern movie-theatres.

When most consumers go down to the store and pick up a big new flat screen plasma or LCD TV, they may think that they are all set and ready to go. In fact, the sound provided by even an expensive top-of-the-range TV is incredibly limited, providing little or no low-frequency response, producing only a flat, distorted version of the movies music, and generating little or no directionality. If they are good at anything, it is producing clear, audible dialogue, but that’s pretty much it.

Modern movie soundtracks contain so much more information; they contain multiple channels so the viewer perceives the sound to be coming from a particular direction, such as a plane flying overhead, or dialogue coming from left or the right. They also contain low-frequency information, to reproduce deep bone-shaking sounds such as explosions or rumbling engines. To be able to access and hear all this extra information you need a dedicated home theatre audio system.

The basic home theatre audio system consists of an amplifier and multi-channel speaker set. The job of the amplifier is to decode and then amplify the multiple audio tracks present on the disc. To do this, it needs to be connected to the DVD or Blu-Ray player by a data-cable. A fiber-optic digital audio cable (also known as a TOS-link cable) will be needed for DVD’s, but to decode next-generation hi-def audio will require a HDMI cable connection. The HDMI cable also carries the video stream, so most amplifiers will have a HDMI out socket, allowing the video information to continue on to the TV or projector.

In terms of power, a quality separate amplifier be marked somewhere in the 80-100 watt range, which is plenty for watching a movie in the average family home. Beware amplifiers that are built into DVD players, or into a speaker set, they are usually underpowered and will perform poorly. The most demanding audio signals to reproduce are the low-frequency type; so many speaker-sets will have “active” sub-woofers, which have small dedicated amplifiers built in.

Speakers for home-cinema can be purchased in packages of matched sets, or individually, allowing you to mix fronts from one manufacturer with rears from another. In general, purchasing a set of matched speakers is the best option for beginners and will produce a very good sound. Unlike regular stereo speakers, home cinema speaker-sets are generally split into dedicated low and mid/high frequency speakers, with the sub-woofer speaker handling the low-frequency sounds by itself. This works because it is very difficult to detect the direction of low-frequency sounds, so it does not matter where in the room the sub-woofer is placed. By contrast the direction of mid and high frequency sounds is easier to detect, so speaker-placement is key, with left/ right speakers best positioned level with the screen and widely spaced apart, the central speaker positioned directly beneath the screen, and the rear speakers positioned diagonally facing the viewer from behind. This setup is for a 5.1 speaker set, which is all that is really required for proper directionality, although 6.1 and 7.1 sets are available.

The Htc Hd2 – A Powerful Window Mobile Smartphone

The Windows Mobile os has received plenty of criticism in the past few years for falling behind rivals such as Google’s Android and Apples iOS platforms when it comes to speed and usability. Despite these flaws the Microsoft platform still remains a popular option for business users due to the tight integration with Microsoft Exchange email servers and the Microsoft Office suite.

HTC have brought their smartphone expertise to the Windows Mobile platform with the release of the HTC HD2. This smartphone runs version 6.5 of the Windows Mobile operating system, but HTC have created their own custom built user interface that includes a more touch-friendly interface, with configurable home screens and support for widgets that can provide services such as live social networking updates.

The hardware of the HTC HD2 is very impressive, with the clean, functional design utterly dominated by a huge 4.3 inch hi-def touchscreen display. Despite the phones size, it still feels manageable, thanks to a reasonable overall weight and a thickness of only 11mm. The HD2 is packed with the latest smartphone features, including 3G HSDPA and Wi-Fi connectivity, as well as GPS functionality and a powerful 5 Megapixel digital camera with dual-LED flashes that can produce outstanding images in addition to recording video.

The HD2 is powered by a super-fast 1Ghz processor that enables HTC’s customized user interface to run without any slowdowns. There is a fully featured media-player application, which together with the large screen and expandable microSD card memory, means the HTC HD2 can function as a great mobile media player. Naturally, the Window Mobile handset comes with support for Microsoft Exchange and the mobile version of Microsoft Office, and the large touchscreen proves ideal for surfing the internet when on-the-go.

With the HD2, HTC have managed to sustain their reputation for building attractive, cutting-edge handsets. The massive screen and powerful processor at the heart of the HD2 mean this is a mobile phone that truly feels like a mobile computer, and the customized user interface is a much needed improvement over the standard outdated Windows Mobile alternative. Users who have no use for the integrated services of a Windows Mobile device will still probably want to consider HTC’s Android handsets before the HD2, but for anyone in the market for a Windows Mobile handset, HTC has provided a very welcome option.