Home Theater – Page 2 – Tech DC – home and office computer support for D.C., Virginia & Maryland

January 11, 2010January 11, 2010

3D Video and Nausia

The Consumer Electronics Shows (CES) just wrapped up in Las Vegas and one of the main themes was 3D video coming to home televisions. Along with this, the big movie Avatar is being shown in many locations in 3D.

3D audience

While 3D adoption will grow, there are some problems such as having to wear silly glasses and the “depth of field”.

Depth of Field Problem

About 20% of the people I know who saw Avatar in 3D said that they felt nauseous or got a headache. This is primary due to a “depth of field” problem.

When you look at a close up object in the real world, you focus on it and things in the background are out of focus. You then look at something far away and then can focus on that clearly.

In 2D movies, the camera focuses on what is important and other items are out of focus, especially when there is a wide depth of field.

In 3D movies, our eyes expect to be able to look at an out-of-focus area and have it come into focus, just like in real life. But if it was shot out of focus, this is impossible. Further, the shallower the depth of field (meaning the more that the foreground and background are both in focus) the more cartoonish a video can look. This is a reason that cartoons, because they have no depth of field, work great with 3D.

An article at Shadow Locked explains How to avoid getting a 3D headache while watching Avatar. You have to look at what is in focus. See picture:

3D Does Work in Many Cases

For cartoons and sports, we do not expect to see a depth of field. And typically James Cameron shot Avatar with little depth of field. But, to the extent that depth of field is an important tool for movies, it will limit adoption of 3D movies for many people.

January 9, 2010

Harmony Remote Favorite Channel Icon Image

If you’ve got a recent harmony remote such as the Harmony One and have hard to remember 3 or 4 digit TV channels, setting up favorites can be very useful. Then you just have to select the channel on the remote and the right numbers are sent. To make things even prettier, you can define icons for each channel.

A great place to download icons is iconharmony.com. The interface is a little strange but you can search for each channel icon image you want and select it. Once you have selected each image you want, you can download them all in one zip file. You use the logitech harmony remote software to define your favorite channels and browse files to assign the icons.

December 9, 2009

Buying a Home Theater Projector

Why you should buy a home theater projector

Screen size. For the ultimate large screen (100+ inch) theater experience, a front projector is the only solution under $80,000. There are large LCD, Plasma, and rear-projector televisions, but none over 100 inches that can practically be purchased or fit through your door.

Why you should not buy a projector

Lighting. Ambient light from windows and lamps immediately washes out a projector’s colors and dark details. To have a proper picture with correct colors and darks, you need to be able to completely control the light in that room, for example, by having heavy drapes on the windows. This creates a theater environment but can be impractical for casual viewing.
Installation. Projectors need to be mounted properly and focused so that there are no distortions. A screen also needs to be installed for best picture quality.
Maintenance. Projector bulbs need to be replaced every year or two, depending on usage and bulb life. Some projectors also need to be vacuumed for dust periodically.
Noise. Fan noise can be loud and irritating on some models.

Researching a projector

ProjectorReviews.com by Art Feierman. Art has by far the most in-depth reviews of home theater projectors. People in forums anxiously await his reviews and refer to him when making arguments for projectors. Manufacturers sometimes send him test units prior to producing projectors. His daughter helps with the photographs and his friend Mike helps with calibrations.
AVS Forum’s Projector’s Under $3000 page. As with other home theater gear, AVS Forum has intelligent discussions of projectors by shoppers and owners of the equipment. They also have forums on projector screens and making your own DIY screens to save money.
Projector Central. Not as detailed as ProjectorReviews.com, but another resource for reviews.

Some things to consider

1080P versus 720P resolution. Three years ago, 720P resolution was much cheaper than 1080P. But as with LCD TVs, projector manufacturers are putting all their effort into 1080P which can be purchased now for $1000.
Brightness. Ambient light in the room can be somewhat compensated for by a brighter projector.
Noise. If you are sitting close to the projector, you will want one that is relatively quiet, below 30db.
Bulb replacement. Look at replacement bulb costs as well as how many hours of life you can expect for a bulb.

My current favorite

A TV is a personal choice depending on your needs, room environment, and budget. My favorite at the moment is the Epson Home Cinema 8100 (see a review at ProjectorReviews.com) because it has:

Brightness while maintaining good colors. Many other projector’s brightest mode will create much poorer colors.
Shadow detail better than cheaper 1080P projectors.
Quietness. 27db or less. Cheaper 1080P projectors such as the Optima HD20 and Vivitek 1800 are significantly louder. Panasonic makes quieter projectors, but they are not as bright as this Epson.
Good warranty and long bulb life. Epson is easy to work with if you need a repair.

Epson 8100 Projector

Runner-up

I also recommend the Mitsubishi HC3800. It uses DLP technology instead of the Epson’s LCD, which leads to these trade-off’s: Pros: great colors, smaller body. Cons: louder fan, minor rainbow effect which some people notice and some don’t (caused by the DLP’s spinning color wheel).

Where to buy

As with other electronics, there are better deals if you shop online instead of going to Best Buy. I usually start at Amazon, but there are many online stores that will provide competitive pricing.

July 8, 2009September 14, 2009

Wireless Video Sent to a Second Room

It is common for a household to have their DVR in their living room. But how can you watch your recorded shows in another room? If you’ve got Tivo, you can transfer some allowed shows between tivos but that requires paying for a second tivo and hence a second monthly fee. A cheaper alternative is to send the video wirelessly to another room. The RF-Link AVS-5811 Audio and Video Transmission System is a cheap one time purchase alternative to having to pay for an extra tivo, cable box, or satellite box.

There have been wireless video systems in the past similar to this that just never worked very well. This system improves upon those in 2 ways. It has an IR repeater so you can bring your tivo remote in the other room and this catches the signal and sends it back to the tivo so it is like you have the box in the room. Without that, you’d have to run back and forth changing shows. The second improvement is that it operates at the currently less crowded 5.8GHz. That gives it more of a chance to have less interference and hence a clearer picture.

There are a few downsides. This is not HD. It uses old standard RCA connections. However, if you send a widescreen picture over it and then set your TV to display in wide mode, the aspect ratio will look correct. The end result can be a good looking picture that just looks a little fuzzier than HD. If picture quality is less important in your secondary room, then this is the ideal option. The biggest possible downside is if you can actually get it to work or not.

The Amazon reviews show that plenty of people can get it to work but there are definitely situations that it won’t perform well. The biggest factors are how many walls it has to go through and how far away it is. Generally speaking, the further it has to go wirelessly, the less likely it will be to work well. When it starts to underperform, you’ll see lines over the video as well as audio distortions or pops. I recently set this up for a customer sending the signal about 20 feet through 3 walls. It took about 15 minutes to adjust the directional antennas just right but we eventually got to a point with no audio or video distortions. Now this customer simply brings their tivo remote into the second room and they’ve got access to the same shows they would in their living room.

June 22, 2009June 22, 2009

Dish’s DTVPal DVR for Over-The-Air HD TV

Dish, the satellite people, sell the DTVPal DVR, a small box that is a digital video recorder (DVR) similar to TiVo. But this box only works with digital over-the-air TV. It gets its guide information for free digitally over-the-air as well. Therefore, unlike TiVo, it has no monthly fee. It costs $300 but is currently being sold with a $50 instant discount.

DTVPal DVR Box

If you don’t need a cable tuner, this is a great alternative to TiVo. And if you mainly watch over-the-air programming such as NBC, CBS, ABC, PBS, then you can consider ditching cable or satellite for the DTVPal.

Dish subscribers will see that the DTVPal DVR’s Program Guide is the same as that in Dish’s satellite boxes:

DTVPal DVR Program Guide

When we purchased this box, it was clear that the Dish company is still setup to only deal with satellite sales. We got an email welcoming us as a Dish subscriber and referencing their satellite offerings. We even got a service bill for $12.95. After calling Dish, we found out that this was actually just the tax due on the purchase of the box. But the bill made it look like we were Dish satellite subscribers.

Despite those annoyances, this is a great box that makes your television viewing more productive by allowing you to time shift your TV shows.