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Music Without Cables? - A Look At Wireless Audio Transmitter Devices
Avoiding the large mess of cords has lead to a multitude of wireless audio transmitter devices over the years which claim to untie your home audio equipment. Can these devices make good on their claim to eliminate the cable clutter? What impact has changing technology had on their performance?
Wireless transmission of music has begun with the launch of commercial radio broadcasts several decades ago. FM radio is still popular until now though some new technologies such as satellite radio and digital radio formats such as HD radio and DAB radio have started to replace traditional FM radio. Today's wireless consumer devices such as wireless speaker kits, baby monitors, Bluetooth audio transmitters and wireless microphones cut the cord.
Setting up speakers in another room and distributing music throughout the home are some of the applications of wireless audio. Many houses are not wired for audio. We will look at the advantages and disadvantages of today's wireless audio technologies.
Let’s look at the most traditional technology first: FM broadcasts. FM audio transmitters send the audio by utilizing a high-frequency signal which is continuously changing in frequency according to the audio signal. This technology is known as frequency modulation or FM. It is fairly simple to implement. Consequently FM transmitters are extremely cost-effective. Also, FM transmission offers high range. Most of today's wireless consumer products use FM transmission. FM, however, has serious drawbacks in comparison with newer technologies.
The first problem is the fact that the broadcast will pick up noise and thus there will be some hiss or static. The amount of noise will actually vary based on the location of the radio or receiver. FM radio waves are often reflected by walls and obstacles. This will cause several components to cancel each other out consequently causing a varying signal quality in different locations. This phenomenon is called multipath fading. Some wireless FM transmitters utilize two antennae in an attempt to cope with this phenomenon (diversity receivers). FM radios will easily pick up interference from other consumer products which is another problem.
Another technology which has gained popularity recently is called Bluetooth. Bluetooth was originally designed to connect computer peripheral devices wirelessly. Bluetooth will convert he audio into a digital format. This data is then sent via the Bluetooth wireless protocol. One of the advantages is the high robustness against wireless interference. However, Bluetooth was not designed for audio transmissions. Therefore is does have several problems. The first downside is the limited range which normally would be 30 ft or less. The next problem is the fact that Bluetooth does not have enough space to transmit CD-quality audio and as a result the audio is compressed first. Due to the compression, the audio quality will be degraded in comparison to the original. Bluetooth will introduce a delay or latency to the audio signal which is a problem for surround sound and video applications because the wireless loudspeakers will be out of sync with the remaining speakers and video.
The technologies used for satellite radio and terrestrial digital radio offer high range. However, they also use extensive audio compression. Further, a delay of up to several seconds is introduced.
The technology used in Amphony's wireless audio transmitters sends audio in a digital format without audio compression. The signal will preserve the original quality by eliminating audio compression. The audio latency of these products is smaller than 1 ms and consequently this technology is also used in wireless speaker kits for home theater setups.
This technology is fairly robust against radio interference from other wireless transmitters by employing a method known as forward error correction. Rather than using the crowded 900 MHz and 2.4 GHz frequency bands, Amphony products operate at 5.8 GHz and thus offer high reliability. Other than Bluetooth, this technology can operate any number of receivers per transmitter which is essential for sending audio to several locations throughout the residence.
How can get the audio signal from a tv station on a radio?
I wish I could listen to some shows over the radio, when I am not near a tv set. For example, if I don't have a tv available let's say I want to listen to the Dr. Phil show, or my local news broadcast. Can I pick up the audio signal from a tv station on a radio? Do I need a special radio?
There are some devices with TV tuners built in that will allow you to listen to the audio of any analog TV broadcast. Of course, the problem there is that analog broadcasting is nearing its end, so these devices won't pick up TV audio once analog broadcasting ends.
You could look at picking up a Slingbox. If you have a Palm OS or Windows Mobile smartphone, you could use the Slingbox to send your TV audio to your smartphone for you to listen in while on the go. Best part there is that you're not just limited to broadcast; you could listen to any channels you have at home.
Implementing An International IRS In The Name Of Robin Hood (redstate)
**_When good people blindly fall prey to the sinister machinations of the
institutional left, America will be lost._**
Today, under the guise of making the rich "pay their fair share(!)," there is
a global movement for worldwide taxation that is being pushed by the likes of
George Soros, Al Gore, Warren Buffet, Bill Gates, European Socialists, as well
as union bosses (and just about every other Marxist group you can imagine).
However, unless Americans realize the effort and its ultimate ends, some day
soon, we may wake up under the thumbs of global bureaucrats demanding that all
Americans pay their "fair share" to a global tax collector—an _international
IRS_, if you will.
Although the AFL-CIO's Richard Trumka was caught conspiring with European
Socialists last year on the subject of a global tax, lately, the tip of the
spear has become the #OccupyMovement and its slogan "We Are The 99%." And, the
feel-good populist tax on all financial transactions is called the **_Robin
Hood Tax_**.
The push, primarily coming from Europe (where, thanks to the disciples of Karl
Marx, all socialist programs seem to originate from), is gaining momentum on
both sides of the Atlantic. Democrats, for example, ...
Color Organ - Audio Signal Frequency Splitter
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