Abstract
Professional-use wireless microphones used in broadcast production, a stage, a concert, and so on, are called as specified radio microphones. The specified radio microphones had been used in a frequency band of 770 to 806 MHz, however, the band was reallocated to TV-band White Space and 1.2 GHz band due to the rapid development of radio communications systems, such as mobile phones. This led us to study low-latency digital transmission system for the specified radio microphone that enables not only low latency but also high-quality and stable transmission in the new reallocated frequency bands. We adopted an OFDM scheme in consideration for higher information bit rate and robustness against multipath interference. This report describes the history of the development of radio microphones and introduce the standardization of the low-latency digital radio microphone.
