Speaking of wireless microphones, I believe that everyone is familiar with them, especially when singing in KTV. In fact, everyone knows the benefits and uses of wireless microphones, but how much do you know about wireless microphones? So today, Xiaobian will tell you about the principles of wireless microphones?
Wireless microphone principle:
1. A wireless microphone consists of a number of pocket transmitters and a centralized receiver. Each pocket transmitter has a different operating frequency. The centralized receiver can simultaneously receive different operating frequencies from each pocket transmitter. Voice signal.
Second, the wireless microphone's wheat head uses a capacitor column collectively. The sound pressure will change the capacitance of the wheat head. The wheat head is connected to the oscillator circuit. Due to the change of the wheat head capacitance, the oscillator frequency will change accordingly. This frequency contains the audio signal, which we can call it audio. The circuit also includes a fixed frequency carrier frequency for carrying audio, and the composite signal after loading the audio is amplified by power and sent to the space environment. The receiver is a reverse process, and the receiving frequency of the receiver is consistent with the carrier frequency of the wireless microphone. When the wireless microphone is in operation, the receiver will receive the composite signal transmitted by the receiver, and then extract the audio signal from the signal.
Third, the principle of wireless microphone - sensitivity
Sensitivity is the ratio of the output voltage of the microphone to the input sound pressure under unit sound pressure excitation, and its unit is mV/Pa. In order to be consistent with the measurement of the level in the circuit, the sensitivity can also be expressed in decibels.
Summary: The principle of wireless microphone is introduced to everyone here, is it not to know that the principle of a small wireless microphone is so much.
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