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Music Without Cable Clutter? - The Latest Generation Of Wireless Audio Transmitter Gadgets
A large number of wireless audio transmitter products have emerged over the years. They claim to cut the cord to your audio equipment. We will take a look at latest products to see if they can deliver on their promise to eliminate the cable mess and we’ll examine how changing technology has influenced performance of these products.
AM and FM radio was introduced several decades ago and was the earliest kind of wireless audio transmission. While still being popular now, FM radio is now being replaced by recent technologies such as HD radio, satellite radio and DAB broadcasts. A variety of today's wireless consumer products cut the cord such as wireless surround sound kits, baby monitors, wireless microphones and Bluetooth transmitters.
Many homes which are not wired for audio are perfect for using wireless audio to distribute music all through the home. The technologies used nowadays all have pros and cons as we will examine.
Let’s look at the most traditional technology first: FM broadcasts. FM audio transmitters send the audio by using a high-frequency signal which is continuously changing in frequency according to the audio signal. This technology is called frequency modulation or FM. It is fairly simple to implement. Consequently FM transmitters are extremely cost-effective. In addition, FM transmission offers high range. While the majority of today's 900 MHz products utilize FM transmission, FM has some major problems.
The FM signal will pick up hiss. Therefore there will be noticeable background noise. The amount of static will depend on the location of the transmitter and radio. 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 known as multipath fading. Using two antennae is one technique some devices use to cope with this difficulty (diversity receivers). In addition, FM transmissions will easily pick up interference from other wireless devices.
Bluetooth has gained popularity lately for wireless audio transmission even though this protocol was primarily designed to connect computer peripherals. 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. As a result is does have several problems. The range of the transmission is only 30 ft or less. In addition, Bluetooth does not have enough room to transmit an uncompressed CD-quality audio signal. Consequently the audio is compressed prior to the transmission. This compression will result in a loss of audio quality depending on the degree of compression. The last drawback is the fact that Bluetooth will cause a delay in the signal (also known as latency) which is a problem when used together with video because the audio will be out of sync or when used in a surround sound setup where some of the loudspeakers would be out of sync with the hard-wired speakers.
Terrestrial digital and satellite radio technologies offer high range but use extensive audio compression and have an audio delay of up to several seconds.
The technology used in Amphony's wireless audio transmitters sends audio in a digital format without audio compression. The audio signal will keep CD quality because no audio compression is used. The audio latency of this technology is less than 1 ms. Consequently it can be used for real-time applications such as wireless speaker kits in home theater setups.
This technology is fairly robust against radio interference from other wireless transmitters by using a technique called forward error correction. The Amphony transmitters operate at 5.8 GHz. This frequency space is less crowded than the 900 MHz or 2.4 GHz bands consequently leading to a further improvement of reliability. Other than Bluetooth, this technology can operate any number of receivers per transmitter which is key for sending audio to several locations throughout the residence.
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