An Introduction To Portable Dvd Players

Writen by Ross Bainbridge

A digital video disc, or DVD, is an optical disc storage media that lets you store data, including movies, and DVD players are devices that let you play DVDs. The discs are normally twelve centimeters in diameter, with a few having an eight-centimeter diameter. Portable DVD players are DVD players that allow you to watch movies whenever and wherever you like—they let you watch a movie "on the go."

Portable DVD players have a liquid crystal display, or LCD, screen attached to them. The LCD is in contrast to a standard DVD player, which needs to be connected to a television set for viewing. Portable DVD players are compact and lightweight and can be operated very easily. These devices are the perfect entertainment companions for the highly mobile traveler.

There are various features of a portable DVD player that are worth noting. The dimension of the player is important, since having a large rechargeable battery can add unwanted weight to the player, when the preference is for a lightweight device. Most portable DVD players are compatible with compact discs and with home entertainment systems. A larger screen provides a better viewing experience. Some of the portable DVD players come with surround sound systems that provide excellent sound quality.

Portable DVD players can cost anywhere from $100 to over $300. The price changes based on the features of the product, as mentioned above. Some of the leading companies in the portable DVD player industry are Sony, Samsung, Philips, Panasonic, GoVideo, Toshiba, and Coby. Currently, some of the top brands are the Panasonic DVD LS-90, Philips PET 1000/37, Sony DVP-FX 705, Coby TF-DVD500, GoVideo DP7240, and the Samsung DVD-L1200. However, the highly competitive nature of the market and the extremely dynamic nature of this industry give no guarantee that these brands will remain at the top of the most popular portable DVD players' list.

Portable DVD Players provides detailed information on Portable DVD Players, Cheap Portable DVD Players, Portable DVD Player Reviews, Compare Portable DVD Players and more. Portable DVD Players is affiliated with Headrest DVD Players.

Home Theater Project Options Abound

Writen by Tom Sample

There used to be a time when a home theater was a reserved experience for only the most wealthy - those who could afford private reels of movies and who had the space to dedicate an entire room to the effort. Now, home theater projector models have become more and more affordable, providing a new option for watching not only movies, but also regular television, cable and even computer presentations.

Deciding to turn a room into a home theater is a big decision, but one that can pay off for those who are seriously into entertainment. Nothing other than an actual movie theater can compare to a home theater that's properly set up. Surround sound, good seating, a huge screen and other amenities can make this room a home's centerpiece.

With this in mind, many people choose to go for projectors for their home theaters. The reasons behind the choice are many, but are most certainly not limited to the fact the screen can be huge. Up to 300 inches of huge, in fact.

When choosing a projector, a consumer will quickly find out the options are staggering. In general, there are two types of projector systems. The first is LCD, which means it operates using three crystal display devices and a series of mirrors and lenses. The second is DLP, which uses a silicon chip instead of three LDCs. These projectors have become very compact and lightweight, providing buyers the ability to conceal them in out of the way locations. The screens themselves can be very thin and placed directly on a wall. This saves the space a big-screen television will take up.

The basic advantages to projector over television include:

Portability. A projector can be taken anywhere.

Picture size. With many offering great visibility on screens up to 300 inches, this can't be beat by a regular television.

Bright image. New technology has enabled the use of projectors in bright rooms. Even if the lights are on, the image should still be clear and crisp.

Movie theater experience. These screens really help bring the theater experience home.

When choosing a home theater projection system, the most important things to look for are quality, guarantees and formatting sizes. Since most people who shop for projectors want the real theater experience in their home, the widescreen or 16:9 format is the most sought after. This is the format that's meant for HDTV and it comes in three basic resolutions - 854x480, 1025x576 and 1280x720. These are more commonly known as 480p, 576p and 720p.

When dealing with modern technology, any of the resolutions should provide some incredible viewing opportunities. Since DVDs generally only provide 480 lines of resolution, the lower setting should work fine. The other options do provide for great viewing as well, especially when you'll be sitting closer to the screen. Detail on the higher resolutions doesn't break up as much when viewed from a closer distance.

No matter the projector make or model you end up with, remember a home theater is an investment in some quality movie watching. A room set up correctly can become the primary spot for family living.

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Eliminating That Terrible Hum From Your Home Theater Speakers

Writen by Steve Faber

You've all heard it, that dreaded 60Hz hum through the speakers of a home theater or house audio system. Hopefully you heard it at a friend's house and not your own. It can drive you completely nuts. You may have even tried, unsuccessfully, to fix the little noise problem. That can make you even more crazy. What causes that horrendous noise through your speakers?

More often than not humming through your speakers is caused by a grounding problem. There are three main ground problems that cause problems in an audio / video system. These are ground loops, improper grounding and lack of a ground altogether. The other possible culprits that can cause noise are bad cables, a faulty piece of equipment or electrical noise from a lighting dimmer or electric motor. There are steps you can take to troubleshoot the noise and eliminate it from you theater.

The first step is find out where it is coming from. Disconnect your source and display equipment from your receiver or surround sound processor. If the noise stops, connect them back to the receiver or processor on at a time until the noise returns. When the hum comes back, you found where the noise is entering your system. Note that if you are connecting remote equipment, such as running the signal from your theater room DVD player to the TV in the bedroom, your chances to pick up noise increase dramatically. With such long runs, noise can be induced into the long cable runs from adjacent electrical wiring. It is also easy to create a ground loop, because the equipment is plugged into two different, widely separated outlets, on different electrical circuits.

If the noise is caused by a cable box, the noise is likely caused by the cable TV ground. To test this theory, disconnect the incoming cable TV feed to the rear of the cable box or TV while they are still connected to the rest of the system. If the noise is eliminated by disconnecting the TV cable, the problem is the cable TV ground. You can electrically decouple the cable TV feed from your system with a ground breaking transformer. These are available from many sources. Be advised that many newer, digital cable TV systems require any device in the signal chain to pass a full 1,000 Mhz. Some of the older ground break transformers will not do this. Be sure to check the specifications of whatever device you are purchasing to verify it will pass the digital cable TV signal.

If the noise is from your projector, TV, or monitor, it is most likely caused because the video display device is plugged into a different outlet than the other a/v equipment. It could be on a different circuit as well. These circuits may have two different ground potentials. That is, the resistance to ground is different on each circuit. A difference in resistance to ground from one ground point to another can cause the dreaded ground loop. If you get a ground loop, current flows between the two components. If the current flows through the components internal audio signal ground, you will get a hum.

You can use an isolation transformer, similar to the type used for cable TV ground problems, to eliminate the electrical connection from one component to the other. These transformers are inserted in line with the audio signal connection between the two components. If there is no audio connection between the components, the problem may be current flowing through the video portion. In this case, a video isolation transformer should be used to eliminate the ground loop.

Sometimes power conditioners will stop noise problems by placing equipment on different, electrically isolated outlets. This is done using isolation transformers. Sometimes this is ineffective however, due to the differences in internal construction of different power conditioning equipment. Some safety regulations, such as UL 1950, specify that an isolation transformer is only allowed to isolate the hot and neutral wires; the grounding wire must be passed straight through. If this is the case, the ground loop problem may still exist because many communication circuits are connected to the grounding conductor and not the neutral. In this case, the isolation transformer, or any power conditioner or UPS with an isolation transformer will have absolutely no affect on the grounding problem.

The noise may be generated externally, from a dimmer or refrigerator compressor for example, and coming in through the main power input on the audio video equipment. In this case, a high quality power conditioner may be effective in reducing or eliminating the noise problem. You may also find that one of the signal interconnecting cables in your system is faulty. This can also cause noise problems. Check for this by swapping the cables with one that you know to be good.

You can solve most noise problems in your home theater or multi room audio/video system by taking the systematic, step-by-step approach. Work your way up the signal chain, eliminating each piece of equipment as you go. If you have nothing connected to your speakers except the speaker wiring, and they still hum, the problem is noise induced into the speaker wiring from adjacent power cables. Other than that case, most problems are caused by ground problems, which you can find, and solve, if you take it one step at a time.

Steve has 15 yrs in the consumer electronics industry. He is a CEDIA certified designer with ISF and THX certificates. His experience includes: installer and programmer; system designer; business unit director for an a/v importer; sales rep for a CE distributor; and principal of a $1.5M+ CEDIA firm. He's now senior sales engineer for Digital Cinema Design in Redmond, WA. For more information on how to make your home theater better, and what's on the horizon, including CEDIA and CES show reports, see The Home Theater and Automation Guide