Television and Radio |

Home audio and video systems have changed dramatically from their earliest incarnations. Television began as a mechanical device but didn’t really catch on until electronic TVs began to hit the market and more broadcasters began signing on.

It grew more popular as it changed from tiny black-and-white screens to large color sets. And now you can buy TVs that can take up the whole wall of your living room! In February 2009, television stations in the United States will switch from analog to digital signals, encouraging people to buy converter boxes or make the move and upgrade, which means plunking down big money for new high-definition sets.

Televison may be the cornerstone of home audio and video setups, but most people need more than just a good TV. We started recording TV shows on videocassette recorders, but fewer people use them anymore. They’re all switching to digital video recorders, DVDs and Blu-ray discs. And then there’s those sophisticated component sound systems and surround sound systems that add so much character and depth to our television and movie watching.

No doubt, home audio and video equipment is very popular, but deciding on the best equipment can be a challenge. Each person has his or her own preferences that lead to very different choices. We have a whole library of home audio and video articles that will help you learn more about different technologies. Find out what’s inside a remote control. Learn the differences between plasma and LCD televisions. See how speakers work. Find out how to bend your TV schedule to suit your viewing habits, with Internet TV, the TiVo and the Slingbox. We’ll even sneak a peek at the next wave of technologies, such as ultra-high definition TV. Explore our Home Audio and Video articles to find out more.

“Radio waves” transmit music, conversations, pictures and data invisibly through the air, often over millions of miles — it happens every day in thousands of different ways! Even though radio waves are invisible and completely undetectable to humans, they have totally changed society. Whether we are talking about a cell phone, a baby monitor, a cordless phone or any one of the thousands of other wireless technologies, all of them use radio waves to communicate.

Here are just a few of the everyday technologies that depend on radio waves:

• AM and FM radio broadcasts
• Cordless phones
• Garage door openers
• Wireless networks
• Radio-controlled toys
• Television broadcasts
• Cell phones
• GPS receivers
• Ham radios
• Satellite communications
• Police radios
• Wireless clocks

The list goes on and on… Even things like radar and microwave ovens depend on radio waves. Things like communication and navigation satellites would be impossible without radio waves, as would modern aviation — an airplane depends on a dozen different radio systems. The current trend toward wireless Internet access uses radio as well, and that means a lot more convenience in the future!

­The funny thing is that, at its core, radio is an incredibly simple technology. With just a couple of electronic components that cost at most a d­ollar or two, you can build simple radio transmitters and receivers. The story of how something so simple has become a bedrock technology of the modern world is fascinating!