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source:Industry News release time:2021-09-30 Article author:sznbone Popular:Prison Jamming system
What is a recording blocker?
The recording blocker interferes with the recording of mobile phones, voice recorders and other recording equipment. The encrypted interference signal emitted can make the recorded sound dope with noise and make the conversation inaudible; the signal blocker is to block the mobile phone signal, so that the mobile phone Can't make and receive calls, can't surf the Internet, both of them are shielding devices but their functions are different.
Recording shielding is the use of random pulse sequences in a wide frequency range to carry out random interference. High-power high-frequency signals cause electromagnetic interference to the recording equipment, causing the input voltage or input current of the front end of the acoustic sensor to exceed the threshold of the acoustic sensor, making it unable to work normally. Effective blocking of voice.
The recording blocker will emit ultrasonic waves that exceed the threshold of human hearing and are harmless to humans. Using our self-developed ultrasonic noise algorithm, the microphones in digital devices such as mobile phones and voice recorders will be affected by the anti-recorder. The sound of normal conversation is submerged in random noise, and the post-recording processing algorithm is also difficult to restore, thus protecting the content of the conversation from being leaked from the source.
The principle of the recording blocker is to emit ultrasonic waves with random noise that the human ear cannot perceive. When a digital device such as a mobile phone is recording, these noises are recorded into the digital device together with the sound of normal conversation, making the recorded audio invalid. The audio information in the captured video also has the same interference effect. Because the noisy ultrasonic noise is randomly generated and cannot be restored, the audio after the interference cannot be restored, thereby ensuring that the original information is not leaked and spread.
Signal jammers can be shielded. Mobile phone signals, WIFI signals, walkie-talkie signals, GPS signals, remote control signals, etc. are all types of signals. This type of jammer interferes with normal signal reception through its own frequency signals, such as mobile phone signal shielding. The principle of the device is to scan from the low end frequency of the forward channel to the high end at a certain speed during the working process. This scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station, achieving the purpose of shielding the mobile phone signal.
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