With the development of information society, audio and video information has two significant characteristics: explosive growth and viral transmission. Personal privacy, business secrets and other information are at risk of being leaked through conversation, especially those valuable conversation information. How to protect the conversation content from being obtained by others?

The working principle of MDPB-L7 is to emit ultrasonic waves with random noise that cannot be perceived by human ears. When digital devices such as mobile phones record, these noises are recorded together with the sound of normal conversation into the digital device, making the recorded audio invalid. The audio information in the recorded video also has the same interference effect. Since the noise with ultrasonic noise is generated randomly and cannot be restored, the audio after interference can not be restored, so as to ensure that the original information is not leaked and transmitted.

good anti-recording effect: our self-developed FPGA-based ultrasonic noise algorithm can effectively interfere with mobile phones, voice recorders and other digital equipment, the anti-recording effect is at the advanced level, and can effectively ensure that the conversation is not recorded, so as to ensure the security of information;

wide range: the protection range of a single anti-recording device is approximately a conical space, the interference range is about 15 square meters, and the interference distance for most mobile phones and other digital products is more than 2 meters, which can form a safe space, in which there is no need to worry about being recorded by others;

many active devices: We have tested iPhone, Huawei, Xiaomi, OPPO, VIVO, Samsung, Nubia, Meizu, Guan and other new and old models of mobile phones, the interference effect is good, the test SONY, Samsung, Newman, Lenovo, Olympus and other recorders, the interference effect is good;

Quiet guardian: the sound waves emitted by the anti-recorder can only be received by mobile phones, voice recorders and other digital products, but people can not hear the sound. Compared with other anti-recorder, there is no buzzing noise, and it can quietly guard the conversation environment is not easy to be noticed.