IIn this article, the BOLY expert will tell you about the digital wireless microphone systems.

A number of pure digital wireless microphone systems do exist and there are many different digital modulation schemes possible. Digital audio compression is normally used in order to reduce the occupied RF bandwidth. The RF bandwidth that would be required to transmit un-compressed digital audio with sufficient resolution, dynamic range and audio bandwidth for professional audio applications is generally regarded as prohibitive otherwise.

The Zaxcom, Lectrosonics 700, AKG and MIPRO systems, for example, use 200 kHz narrowband UHF broadcast frequencies, the same UHF frequencies used by analogue FM systems, for transmission of a digital signal at a fixed bit rate. These systems encode an RF carrier with one or two channels of digital audio. Advantages of such system include low noise, low distortion, the opportunity for encryption, and enhanced transmission reliability.

Pure digital systems take various forms. Some systems use frequency-hopping spread spectrum technology, similar to that used for cordless phones. As this can require more bandwidth than a wideband FM signal, these microphones typically operate in the unlicensed 900 MHz, 2.4 GHz or 6 GHz bands. The absence of any requirement for a license in these frequency bands is an added attraction for many users, regardless of the technology used. The 900 MHz band is not an option outside of the USA and Canada as it is used by GSM cellular mobile phone networks in most other parts of the world. The 2.4 GHz band is increasingly congested with various systems including WiFi (also referred to as Wireless LAN, wireless networks, 802.11b/g/n), Bluetooth and 'leakage' from microwave ovens. The 6 GHz band has problems of range (requires line of sight) due to the extremely short transmission carrier wavelengths.

Digital radio microphones are inherently more difficult for the casual 'scanner' listener to intercept because conventional "scanning receivers" are generally only capable of de-modulating conventional analogue modulation schemes such as FM and AM. However, some digital wireless microphone systems additionally use encryption technology in an attempt to prevent more serious 'eavesdropping' which may be of concern for corporate users and those using radio microphones in security sensitive situations.^[14][15]

Manufacturers currently offering digital wireless microphone systems include AKG-Acoustics, Audio-Technica, Lectrosonics, Line 6, MIPRO, Shure, Sony, Sennheiser and Zaxcom.

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