Protect Voice Expert-Recording Jammer!Meeting room jammer

　　At present, the issue of voice leakage has always been a worldwide problem, and voice leakage incidents in various places have emerged in an endless stream. Some voice information leakage incidents even involve the level of national security. Individuals and organizations have been suffering from not having a good voice information confidentiality product. Technically, this problem is solved very well.

　　Shenzhou Mingda has focused on information security for 14 years. The newly developed L7B recording jammer is upgraded on the basis of the original equipment. The FPGA-based ultrasonic noise algorithm eliminates the high-frequency noise of the old equipment. It has joined the brands that have been on the market in the past two years. The information of mobile phones and recording equipment has a very obvious effect on the new recording equipment and mobile phone recording. It can shield the recording of sound collection devices such as mobile phones, voice recorders, and tape recorders, which protects the security of voice information and allows people to speak freely.

　　The recording jammer emits ultrasonic waves with random noise that human ears cannot perceive. When recording on digital devices such as mobile phones, these noises are recorded into the digital device together with the sound of normal conversations, making the recorded audio invalid. The audio information in the video also has the same interference effect. Since the noisy ultrasonic noise is randomly generated and cannot be restored, the audio after the interference cannot be restored, thus ensuring that the original information is not leaked and spread.

　　During the working process of the recording blocker, random interference signals will be generated, which can ensure that the original voice information cannot be restored from the recorded signal. The interference signal interferes with the recording equipment without causing harm to the human body. After the interference signal is picked up by the recording device, it will cause only a piece of buzzing noise in the recording signal and the normal sound signal cannot be distinguished, so as to achieve the purpose of protecting the voice information.

　　working principle

　　In the working process of the recording blocker, the real random number is used as the seed, and the high-security encryption algorithm is used for encryption operation, and then the encrypted random number is processed by mixing the high and low frequency sound source to produce unrecoverable, silent and mixed The interference signal with overlapping effect interferes with the sound collection device, thereby forming a sound shielding effect.

　　In the field of recording shielding equipment, there is only one device that is known to people. The recording shielding equipment is mainly for the obsolete tape recorders and few types of voice recorders and eavesdroppers. For the current mainstream recording equipment, mobile phones, digital voice recorders, etc., there is almost no effect or the effect is very poor.

　　The traditional recording shielding technology scheme mainly uses a wide frequency range of random pulse sequences 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. Can not work normally and achieve effective voice blocking. This method is noise-free, but its main disadvantage is that it only interferes with analog recording equipment and is basically ineffective for new digital recording equipment. At the same time, high-power wireless electromagnetic signals will produce electromagnetic radiation, which is harmful to the human body when used for a long time.

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