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how have advanced wireless speakers1845 .pdf


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how have advanced wireless speakers
I will take a look at exactly how modern day audio transmission technologies that are utilized in
current wireless speakers work in real-world conditions having a great deal of interference from
other cordless gadgets.
The growing interest in cordless consumer products just like wireless speakers has begun to
result in problems with several products competing for the constrained frequency space. Wireless
networks, cordless phones , Bluetooth and also other devices are eating up the valuable
frequency space at 900 MHz and 2.4 GHz. Wireless sound systems need to assure robust realtime transmission in an environment which has a great deal of interference.
FM type sound transmitters are typically the least robust in terms of tolerating interference since
the transmission does not have any procedure to deal with competing transmitters. On the other
hand, these types of transmitters possess a fairly constrained bandwidth and switching channels
may often avoid interference. The 2.4 GHz and 5.8 Gigahertz frequency bands are utilized by
digital transmitters and also have become rather congested these days as digital signals occupy
more bandwidth compared to analogue transmitters.
Frequency hopping systems, however, will continue to create problems given that they are going
to affect even transmitters using transmit channels. Sound can be considered a real-time protocol.
As such it has stringent demands concerning dependability. Additionally, low latency is important
in numerous applications. Thus more sophisticated strategies are required to assure reliability.
One strategy is named FEC or forward error correction. This method will allow the receiver to fix a
damaged signal. For this reason, additional data is transmitted by the transmitter. The receiver
utilizes a formula that uses the extra data. In the event the signal is damaged during the
transmission resulting from interference, the receiver may remove the incorrect information and
restore the original signal. This approach will work if the level of interference does not exceed a
specific threshold. FEC is unidirectional. The receiver doesn't send back any kind of information to
the transmitter. Thus it is often employed for equipment like radio receivers in which the number
of receivers is large.
In situations in which there is just a small number of receivers, often yet another mechanism is
used. The cordless receiver sends data packets back to the transmitter to confirm correct receipt
of information. The information which is broadcast has a checksum. Because of this checksum
the receiver may see whether any particular packet was received correctly and acknowledge. In
cases of dropped packets, the receiver is going to notify the transmitter and the lost packet is
resent. As such both the transmitter and also receiver have to have a buffer in order to store
packets. Employing buffers brings about a delay or latency in the transmission. The amount of the
delay is proportional to the buffer size. A larger buffer size increases the dependability of the
transmission. However a big buffer can lead to a large latency that may lead to difficulties with
speakers not being synchronized with the video. Products that incorporate this mechanism,
however, are restricted to transmitting to a small number of receivers and the receivers consume

more energy. To steer clear of crowded frequency channels, a number of wireless outdoor
speakers available at www.amphony.com/products/wireless-speaker.htm monitor clear channels
and can change to a clear channel as soon as the existing channel gets occupied by another
transmitter. Because the transmitter has a list of clear channels, there isn't any delay in trying to
find a clear channel. It's simply picked from the list. This method is frequently called adaptive
frequency hopping spread spectrum.


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