Transmitter Receiver
 |
 Spektrum 24GHz DX6i 6 Channel Transmitter w AR6200 Receiver  US $169.00
|
 24G FS CT6B 6CH Radio Model RC Transmitter Receiver US $148.84
|
 24G 6CH Radio Model RC Transmitter Receiver FS CT6B US $148.80
|
 12CH 24G 1000MW Wireless A V Home Transmitter Receiver US $144.99
|
 24G 4CH Radio Model RC Transmitter Receiver Heli FS T4 US $142.99
|
 24G 4CH Radio Model RC Transmitter Receiver Airplane US $141.99
|
Music Without Cables? - Pros And Cons Of Wireless Audio Transmitters
Avoiding the big mess of cords has lead to a multitude of wireless audio transmitter devices over the years which promise to untie your home audio equipment. Can these devices make good on their promise to eliminate the cable clutter? What influence has changing technology had on their performance?
AM and FM radio was launched several decades ago and was the first kind of wireless audio transmission. While still being popular now, FM radio is now being substituted by modern technologies such as HD radio, satellite radio and DAB broadcasts. Today a variety of consumer products exist such as wireless microphones, wireless surround sound kits, Bluetooth audio transmitters, baby monitors etc which eliminate the cord by transmitting audio wirelessly.
Many houses 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 utilizing a high-frequency signal which is constantly changing in frequency according to the audio signal. This method is called frequency modulation or FM for short. The biggest advantage of FM transmitters is their simpleness and thus cost as well as range. While the majority of today's 900 MHz products use FM transmission, FM has some major problems.
FM transmissions will pick up noise which is noticeable as a background hiss depending on the location of the wireless 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 known as multipath fading. Using two antennae is one approach some devices use to cope with this problem (diversity receivers). Another problem is that FM radios easily pick up interference from competing wireless transmitters.
Bluetooth based audio transmitters have gained popularity lately. Bluetooth is a common wireless protocol which was designed primarily as an interface between computer peripheral products. Bluetooth audio transmitters will convert the audio signal to digital information and then transmit via the Bluetooth protocol. While offering high robustness against wireless interference, Bluetooth has several pitfalls in regard to audio transmission since it was never designed with the purpose of transmitting audio. The first disadvantage is the limited range which typically would be 30 ft or less. The second drawback is the fact that Bluetooth does not have sufficient room to transmit CD-quality audio and for that reason the audio is compressed first. Due to the compression, the audio quality will be degraded in comparison to the original. The last problem 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 since the audio will be out of sync or when used in a surround sound setup where some of the speakers would be out of sync with the hard-wired speakers.
Satellite radio and digital terrestrial radio technologies offer high range but use extensive audio compression leading to degradation of the audio signal and have an audio delay of more than a few seconds.
Another technology transmits the audio signal without compression digitally. This technology is used in wireless audio transmitters from Amphony. The audio signal will preserve CD quality because no audio compression is used. The audio latency of this technology is less than 1 ms. As a result it can be used for real-time applications such as wireless speaker kits in home theater setups.
This technology is rather robust against radio interference from other wireless transmitters by using a method known as forward error correction. Rather than utilizing the crowded 900 MHz and 2.4 GHz frequency bands, Amphony products operate at 5.8 GHz and thus offer high reliability. An advantage over Bluetooth is the ability to transmit audio to any number of wireless receivers from a single transmitter. This is important for distributing audio to multiple rooms in the house.
can we sense the distance between a radio Transmitter & receiver, if they are placed 10-100m apart ?
If it is possible, tel me the efficiency of transmission..
There are so many receivers and transmitters which are highly efficient..For Example, TSOP receiver will detect only one frequency that is used to transmit. Also we can sense the distance even if it is kept 10-100m apart.
Rocketboost launches PC and iOS Control App for its wireless devices (Engadget)
Rocketboost, that "breakthrough wireless audio technology" from Best Buy, just
got a feature boost in the form of a new Control App. Owners of the company's
Rocketfish and Insignia speakers and soundbars should be jumping for joy --
assuming they still have energy after completing all the steps necessary to
start beaming wireless tunes. First up on the shopping list is the
"Rocketboost Wireless Receiver / Transmitter," which you can pick up from your
neighborhood Best Buy for a measly 65 bucks. Once you've got your hands on
that hideous black box, you'll have to plug it in via USB to your Windows
machine (yup, no Macs) and install another Rocketboost must-have, dubbed
"Control Computer Software." Finally, one of the last steps towards your
Airplay-like quest is to hit up the iOS App Store (no Android for now) and
snatch the Control App, which should be running in sync with the one on your
PC. Still here? You can catch the app in action after the break, and check out
the source link for the play-by-play to get started.
Continue reading _Rocketboost launches PC and iOS Control App for its wireless
devices_
Rocketboost launches PC and ...
IR transmitter and receiver
You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.
Comments are closed.