Ultra-wideband (UWB) now moves HD audio into the unlicensed 3.1 to 10.6 GHz band and designates it as a personal area network, in order to regulate this chaotic state. Radiient Technologies said the world's first ultra-wideband wireless audio solution will be on display at the International Consumer Electronics Show next week (January 7-10).
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"We have developed wireless surround sound based on UWB technology and there is no loss of audio signals at all," said Jano Banks, president of Radiient Technologies.
Radiient's Roomcaster samples use the ultra-wideband chipset technology to broadcast very low-power, ultra-wideband pulse codes that are almost immune to short-wavelength multipath interference. Because UWB technology cannot penetrate walls, the prototype is designed for a single room audio network. Currently, Radiient has not yet selected a supplier.
Compared to Wi-Fi's 54Mbps transmission rate, ultra-wideband data transmission rates of up to 675Mbps. With a wider range of available bandwidth, the five channels of the surround sound system can transmit wirelessly at very low power levels.
"Ultra-wideband offers almost unlimited channel selection. We use hundreds of megahertz wide channels in the 3 to 10 GHz band compared to the 20 MHz wide channel in the 2.4 GHz band," Banks said. "The advantage of UWB in audio is that it provides a lot of bandwidth for all surround speakers, and it's very fast, with only 16 milliseconds of response time. So when it's used with HD video, there's no lip sync ( Audio and video synchronization) problems.
The human brain can only perceive the lip sync problem with a waiting time of more than 20 milliseconds, but the ultra-wideband allows the fast communication of broken packets to have time to not only be forwarded, but also if necessary, without the need to increase the delay. From the main unit connected to the audio source to each remote speaker, the sample maintains a two-way communication channel and then the mesh network is sent to each speaker to stream audio data.
"We have built a mesh network over UWB to make our communications strong," Banks said. “We can not only send audio to the speakers but also receive feedback from the speakers.â€
Since each speaker receives all data streams, the mesh allows the speakers to communicate with each other using their transceivers, and the erroneous packets can be redirected from one speaker to the next to avoid interference.
"We use peer-to-peer architecture, and the more channels we add, the better performance, because there are more paths available for communication," Banks said.
Despite the occasional rebroadcast of the data packets, high-speed UWB communication allows the sample to synchronize signals from the speakers in about 100 microseconds. Even when corrupted packets have to be forwarded, Radiient says that synchronization between channels is only 1 millisecond.
The upcoming Moviecaster sample at CES is based on the ARM9 processor core and uses an ultra-wideband wireless communication chip from an unspecified semiconductor organization. Radiient is currently experimenting with chipsets from different vendors and has not yet decided on vendors. The final product will be launched later in 2008.
Radiient is also developing an ultra-wideband system that can simultaneously transmit wireless headsets and microphones. The company claims that Skype and other Internet telephony services can be integrated into his hi-fi music distribution system.
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