This is Audio Technica's proposal for dealing with the white space issue: Ultra Wideband wireless transmission: using a "a series of short nano-second pulses which occupy an instantaneous bandwidth of 500 MHz,:" they utilize the 6.4 GHz band. Because of the high band and low RF power (40 nanowatts), there are some severe distance limitations. But this is brand new technology, and it's a solution! Hats off to AT for the new technology.
This is their press release:
Audio-Technica has partnered with Multispectral Solutions, Inc.® (MSSI®), the industry leader in the development of Ultra Wideband systems for communications, radar and geo-positioning, to introduce this new application of UWB technology.
A-T’s SpectraPulse Ultra Wideband wireless microphone system represents the first commercial sound implementation of UWB technology, which has recently been licensed for commercial use by the U.S. Federal Communications Commission (FCC). Ultra Wideband technology allows the wireless transmission of data in extremely short-duration pulses over a wide spectrum of frequencies. Instead of utilizing conventional channels and carrier frequencies, UWB technology uses a series of short nano-second pulses which occupy an instantaneous bandwidth of 500 MHz within the 6 GHz frequency spectrum.
The signals, in precisely timed sequences, result in the reliable transmission of information near noise-floor levels. The “decoding” of these pulses requires the specialized technology incorporated into the SpectraPulse system – making SpectraPulse inherently secure and preventing signal interception by other wireless systems. For a higher level of security, Audio-Technica offers an optional encryption package that meets the NIST-approved (National Institute of Standards and Technology) AES 128-bit encryption standard developed by the U.S. government for securing sensitive material.
This press release is from AT's website.
AT's white paper on the technology is here.
Wireless for conference room application is shown here.