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2. Wireless microphone - Wikipedia

   en.wikipedia.org/wiki/Wireless_microphone

   A wireless microphone, or cordless microphone, is a microphone without a physical cable connecting it directly to the sound recording or amplifying equipment with which it is associated. Also known as a radio microphone , it has a small, battery-powered radio transmitter in the microphone body, which transmits the audio signal from the ...

3. Raymond A. Litke - Wikipedia

   en.wikipedia.org/wiki/Raymond_A._Litke

   Litke’s wireless mike resembled a silver tube with “a microphone at the top, a transmitter in the middle and its battery power supply at the bottom.” [1] It was 6 inches long, 1 inch in diameter, and weighed 7 ounces; the device had a broadcast range of up to a half-mile. Two types of mikes were available: lavalier and hand-held.

4. Wireless conference system - Wikipedia

   en.wikipedia.org/wiki/Wireless_conference_system

   The wireless communication system first used a digital modulating signal based on infrared ray, which is evolved from IR interpretation system. Secondly, the technique applied in wireless conference system is 2.4 GHz modulating signal, which support more stable communication and avoid environment interference caused by buildings, sun lights and ...

5. Comparison of web conferencing software - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_web...

   In the table above, the following terminology is intended to be used to describe some important features: Audio Support: the remote control software transfers audio signals across the network and plays the audio through the speakers attached to the local computer.

6. Wireless microphone licensing - Wikipedia

   en.wikipedia.org/wiki/Wireless_microphone_licensing

   In the UK, the use of wireless microphone systems requires a Wireless Telegraphy Act license, except for the license-free bands of 173.8–175.0 MHz and 863–865 MHz. These license-free bands are sometimes referred to as "Channel 70" (not to be confused with TV Channel 69, which operated on 854–862 MHz and always required a license from JFMG ...

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