Currently, karaoke microphones can be divided into wired karaoke microphones and wireless karaoke microphones.
The commonly used wired karaoke microphone is mainly a moving coil type. Its working principle is: when the sound wave acts on the diaphragm of the microphone to make it vibrate, the voice coil bonded to the diaphragm also corresponds in the air gap of the magnetic circuit. Ground vibration, cutting magnetic lines of force, and generating an induced electromotive force in the voice coil. However, the electromotive force of the microphone output is very low, and a step-up transformer is usually connected to the output end of the microphone to be mated with the audio equipment.
Karaoke microphones are used at close range. In order to achieve good results, the microphones are required to have special near-talk effects and pointing effects to improve performance and environmental interference. That is to say, the sensitivity of the microphone changes at the low frequency end with the distance of the sound source: the closer the distance is, the higher the sensitivity is. High-value karaoke microphones are also equipped with an explosion sound filter that minimizes excessive breathing noise and hum, enabling complete, full-fledged sound reproduction. Another important feature of the karaoke microphone is the control switch on the microphone's housing, allowing you to achieve some special sound effects when singing. The specially designed anti-vibration measures can effectively prevent the friction noise during hand-holding, make your singing bass layer clear, the treble is bright and sweet, the sound quality is soft and beautiful, and it is full of appeal.
The head of a wireless karaoke microphone converts an acoustic signal into an electrical signal, the electrical signal is frequency modulated on a carrier, and the frequency modulated carrier radio signal is transmitted by the antenna. After the radio signal is received by the FM receiver, the sound signal is restored and sent to the karaoke machine. The transmission frequency of wireless karaoke microphones used in homes is mostly in the range of 88 to 108 MHz, and it is intended to use a radio cassette with a frequency modulation band as a receiving device of a wireless karaoke microphone to save money. The power of the transmitter is not large, about 100mW, so as not to interfere with other electrical equipment. Professional wireless karaoke microphones work in the high-end frequency band (150 ~ 216MHz) or ultra-high frequency band (400 ~ 470MHz, 900 ~ 950MHz) in the ultra-high frequency band, with a dedicated FM receiver. The wireless karaoke microphones adopt the frequency modulation system because the frequency modulation has the advantages of strong anti-interference, wide frequency characteristics, high fidelity, low noise, and high transmitter efficiency.
Pay attention to the following points when using a karaoke microphone: (1) The output impedance of the karaoke microphone should match the input impedance of your karaoke machine; (2) When using more than two karaoke microphones, two microphones The phase should be unified; (3) Before use, the volume of the karaoke machine should be adjusted properly to avoid burning the amplifier and speaker at a large volume. (4) Do not hold the net cover with your hand and block the sound hole when using it, so as not to affect the performance of the microphone and reduce the singing effect. (5) Protect the microphone from dust, shock, moisture and magnetism.
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