How to prevent the phone from being recorded?

　　How to prevent the phone from being recorded?

　　Why is there noise in the test video? When recording videos, we have done our best to prevent the recording equipment from being affected by the recording jammer. For example, keep the recording mobile phone away from the recording jammer. First of all, everyone must understand the working principle of the recording jammer. Anti-recording jammers use ultrasonic interference (silent mode) and white noise (acoustic noise mode) to achieve anti-recording. Ultrasonic interference mode. Ultrasound is a sound frequency that is emitted at a frequency that the human ear cannot perceive. It has no harm or impact on the human body, but it will cause huge interference to all equipment that relies on microphones to record sound. The frequency band it emits impacts the pickup film of the microphone head of recording and video equipment, causing irregular frequency fluctuations on the pickup film, so that the sound recorded by these devices is completely irregular noise.

　　Its advantage is that it is silent and safe for humans, and it is lethal to certain animals that are sensitive to low-frequency sounds, such as rats, snakes, and mosquitoes. Ultrasound has the characteristics of being reflected when encountering hard objects and being absorbed when encountering soft objects, so it is destined that the effective distance of ultrasonic jammers will not be too far. You have to believe that the interference distance of a few meters on a certain treasure is too naive . White noise mode, white noise mode is the device emits irregular noise to cover up normal conversation sounds. The conversation in the white noise mode should be conducted in the lowest possible voice, subject to the volume at which both parties A and B can hear clearly.

　　Because the white noise mode is a audible interference mode, it is only suitable for use in an open and informed situation. Whether it is ultrasonic mode or white noise mode, these two modes are frequency-variable, and are interference modes that cannot be stripped and restored by software in the vocal world. So, to sum up, when I record a video for you, whether I use a mobile phone or a video recorder, the microphones of these devices have been severely interfered by jammers. The site I tested was silent, but This is why the video I recorded is noisy.

　　The recording jammer is characterized by high interference intensity: our self-developed FPGA-based ultrasonic noise algorithm can effectively interfere with digital devices such as mobile phones, voice recorders, etc., can record noises, and completely eliminate the harsh ears that a few people can hear Sound. The anti-recorder can interfere with 95% of mobile phones at a distance of more than two meters, 60% of mobile phones at a distance of more than 5 meters, and iPhone X, iPhone 8 and other mobile phones at a distance of 10 meters, which can effectively protect the conversation content. There are many interference devices: it has good interference effects on various mobile phones such as iPhone series, Huawei Mate, Honor, OPPO, VIVO, Samsung, Nubia, Meizu, Nuts, etc., and it has good interference effects on Sony, Samsung, Sanyo, Newman, Lenovo, Olympus, etc. The voice recorder has a good interference test effect.

　　The recording jammer can realize recording shielding in a concealed manner under silent conditions. When criminals use recording equipment (such as mobile phones, voice recorders, bugs, etc.) to record you, the recording jammer will generate random noise signals, which can suppress the voice signal and make the recording equipment pick up There is only noise information, but the voice information cannot be distinguished, and the original information cannot be restored from the recorded signal, so as to ensure the safety of the voice information. Recording jammers are only effective for mobile phones and other digital products, and have no interference to people. Because the human body does not receive ultrasound, the sound recorded by mobile phones is noise, but people cannot hear it, so it does not affect normal conversation and communication, and even the recording cannot be detected. The jammer is working.

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