Noise Reduction: Through the front and rear dual microphone array pickup, the front microphone picks up the main tone to create a sine wave, and the cosine wave of the background noise picked up by the rear microphone is canceled and the main noise is filtered by the noise chip Calculate the separation, to meet the requirements of teaching and testing the recording to attenuate and filter out background noise.

Heart-shaped calculation technology for angle recording: It adopts the heart-shaped calculation technology for angle recording. Only a single sound source can be picked up within the enclosed kidney angle, while the sound source outside the heart-shaped enclosed angle is weakened and shielded. .

With sound card: Built-in sound card chip to digitally decode and calculate the sound, make the sound reproduction higher and the sound quality clearer.

USB2.0: Fully digital decoding interface, chip power supply is more secure, transmission is more efficient and plug and play, no driver is required.

Anti Slobber MIC Sponge Cover: It can prevent saliva from spraying into the microphone, prevent dust from entering the microphone and affect the recording effect. At the same time, it can also filter the noise and sound waves to some extent, which makes the sound source of the recording clearer.