In recent years, wireless microphones and gradually replace the wired microphone. Wireless microphones work well when it is clearly defined what they are for. The purpose dictates the kind of wireless mic needed.
Wireless microphones work by using different frequencies, standard or transmission technologies to replace the cable. In a wired microphone, the cable is used to transmit sound from the receiver in the microphone to an amplifying or recording device. The sound travels as an electric signal through the cable then gets converted back to sound waves. In Wireless Microphone Systems, the electric signal for sound travels through the air in the form of waves or frequencies to a transmitter.
Wireless microphones can use radio waves such as those in the UHF Wireless Microphone and VHF frequencies, FM, AM or other digital schemes. Some low cost models even use infrared, which required that the transmitter have an unobstructed line to the microphone.
