Generally, most receivers have mute control function. When the power of uhf ktv wireless microphone AY-URX7Ⅱ is turned on and there is no microphone signal input or the signal strength is lower than a certain signal-to-noise ratio, the mute control circuit will close the output circuit, and the main receiver will be completely mute. , to prevent noise output. When the microphone signal is turned on, the receiver immediately closes the mute circuit, opens the output circuit, and allows the audio circuit to output the sound of the microphone.

However, when the power of uhf ktv wireless microphone AY-URX7Ⅱ is turned on and off, or when the microphone signal is turned off, occasionally encounters signal interference exceeding the mute control strength, and the receiver mute circuit will also be activated by these impact noises and interference noises. Loud noise. In order to solve this deficiency, the so-called "audio lock mute circuit" is installed in advanced models to suppress it.

The principle is to add a fixed super-audio modulation signal to the transmission signal of the microphone: at the same time, a discriminator is also installed inside the receiver, so that the receiver must receive the microphone signal containing this fixed super-audio modulation signal. When the output circuit is activated, the function of preventing other signals or noise interference can be achieved. In order to protect your valuable audio system from being damaged by loud noises, you must choose a model with a tone code lock mute function.