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source:Industry News release time:2021-09-09 Article author:sznbone Popular:Prison Jamming system
How to realize the technical principle of anti-recording equipment
There are many devices used for anti-recording. The basic technical principles are divided into two categories. One is to use white noise technology, and the other is to use ultrasonic interference technology. The anti-recorder developed by Shenzhou Mingda uses ultrasonic interference technology. The information of various brands of mobile phones and recording equipment that have been on the market in the past two years is added, which has a very obvious effect on the new recording equipment and mobile phone recording.
1. White noise technology
White noise is called WhiteNoise in English, and its principle is to use white noise to interfere with the normal recording of the recorder, making it impossible to record the content of the conversation.
What is white noise?
The power of the frequency components in a piece of sound is uniform throughout the audible range (0～20KHZ). Because the human ears are more sensitive to high frequencies, this sound sounds like a very noisy rustle. This is the so-called white noise.
In fact, white noise is not originally used to prevent recording, but to relieve people’s fatigue and promote sleep, because this kind of noise is a continuous monotonous frequency sound. When people continue to listen to such a sound, it is easy to fall asleep. . These are digressions. Let’s get back to the subject. It is this continuous rustling that makes it easy for white noise to cover or blend into other sound sources. In this way, devices such as recorders cannot record effectively. The content of the conversation.
2. Ultrasonic interference technology
Ultrasonic interference mode. Ultrasound is a sound frequency that is emitted at a frequency that is not perceivable by the human ear. It has no harm or impact on the human body, but it will cause huge interference to all equipment that relies on the pickup to record sound. The frequency band it emits impacts the pickup film of the pickup head of audio and video equipment, causing irregular frequency fluctuations on the pickup film, so that the sound recorded by these devices is completely irregular noise. This is its basic principle. Its advantage is that it is silent and safe for humans.
How the recording jammer works
By emitting ultrasonic waves with random noise that human ears cannot perceive, when digital devices such as mobile phones are recording, these noises are recorded into the digital device together with the sound of normal conversations, making the recorded audio invalid. Audio information also has the same interference effect. Since the noise with ultrasonic noise is randomly generated and cannot be restored, the audio after being interfered cannot be restored, thus ensuring that the original information is not leaked and spread. Confidential meeting room, public security bureau petition center, procuratorate reception hall, courts, negotiation rooms, offices and other places for private conversations
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