Power Wireless
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A Glance At Some Of The Most Recent Wireless Gadgets
Recent wireless audio gizmos such as iPods, wireless headphones and cell phones support latest wireless protocols. These protocols are supposed to eliminate the cord and deliver perfect high-fidelity audio. We will look at some of the most recent products to learn which applications they work for.
A number of products come with wireless already built in while others, specifically streaming audio products, often have optional wireless ability. Latest generation iPods and mobile phones already come with built-in WiFi and Bluetooth support.
Bluetooth is fairly common as a low-cost wireless solution. However, Bluetooth does have some drawbacks. These weaknesses are often overlooked but will have an effect on high-quality audio applications.
1) Inadequate range
Bluetooth devices usually only have a 30-foot range which limits Bluetooth to single-room applications.
2) Audio compression resulting from restricted data rate
Bluetooth reliably supports data transmission rates of about 1 Mbps only which is not enough for uncompressed CD-quality audio. Thus Bluetooth utilizes audio compression. This is less critical though for compressed audio such as MP3 audio but excludes Bluetooth from use in high-quality audio applications.
3) Audio delay
The audio will experience a delay of at least 10 ms for the most part as a result of the audio compression which is a dilemma for real-time audio applications but less serious for MP3 players.
4) No multiple headphone support
Bluetooth cannot stream to multiple headphones at the same time. This might be a problem in cases where a number of people like to listen to the same Bluetooth transmitter.
Another common protocol is WiFi which supports uncompressed audio but also has drawbacks simultaneously streaming to multiple receivers. It is suitable for streaming music from a PC as a result of the high availability but is normally not used in wireless headphone products due to the relatively high power consumption of WiFi.
While newest-generation wireless speakers and wireless amplifier products utilize proprietary digital technologies, low-cost products often still depend on FM transmission which is noisy and has high audio distortion and high susceptibility to radio interference.
More advanced wireless protocols are based on digital formats which avoid audio distortion and incorporate advanced features like error correction to deal with interference from competing wireless devices.
Sophisticated wireless amplifier products support uncompressed digital audio streaming to preserve the original audio quality. Some of these protocols allow streaming to an infinite number of wireless amplifiers which is practical for whole-house audio distribution.
Some of these protocols support low-latency audio transmission which ensures that the audio of all speakers will be in sync in a multi-channel application. These wireless audio transmitters typically work at 2.4 GHz. There are also some products such as Amphony’s line of wireless audio products which work at 5.8 GHz. Products that operate at 5.8 GHz have less competition from other wireless devices than those utilizing the crowded 2.4 GHz frequency band.
Wireless amplifiers offer different levels of audio quality, output power and standby power. Digital Class-D amplifiers offer high power efficiency of a minimum of 80%. They also have low standby power, typically less than 5 Watts. This minimizes heat and keeps them cool during operation. Some digital amplifiers, however, have fairly high harmonic distortion. Choosing a low-distortion amplifier is crucial. Good-quality wireless amplifiers have audio distortion of less than 0.05%.
making more power Wireless?
I have a DSL modem running through a wireless router. but im wondering if I can run a access point in there some where to boost my signal. I all ready have my access point so i dont want to spend money on anything yet I need to wait a while before spending money.
I have thought about making a home made antenna. How could i do that with my wireless router linksys
Yes you can use an AP to extend your network, but you have to run an Ethernet between it and your router. So you'll extend the range by the length of the cable plus the range of the AP.
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