HDTV Forum ? the cell phone jammer or cell phone shielding system

The cell phone connects with the base station within the specified frequency range through the radio wave when it works to finish transmission of data and voice with the specific baud rate and modulation mode.

When environment at site requires the signal shielding, the Cellular Phone Jammer or cell phone shielding system will interfere with the electromagnetic wave signal transmission between the transmission station of mobile communication base station and the cell phone so that the cell phone cannot receive the signal sent by the base station and communication cannot be performed.

Cell phone shielding of mobile phone jammer and cell phone jammer system is the signal (fake data code) sent by the cell phone jammer or cell phone shielding system, which can interfere with several data codes in the communication link of cell phone registering the network. Therefore, cell phone cannot identify the network instruction or register the network so that the cell phone cannot normally communicate.

In communication system, white noise means its power spectrum density function is the constant in the whole frequency domain, i.e. it obeys the uniform distribution. The reason why it is called white noise is that it is similar to the white light including all visible light frequencies in the optics. The noise which doesn?t conform to the above condition is called color noise. Actually, the absolutely ideal white noise doesn?t exist. Normally, if the frequency range of uniform distribution of noise power spectrum density function is far bigger than the working frequency range of communication system, it can be approximately considered as the white noise.

Shielding and cell phone shielding

The shielding literally means shading and blocking. The shielding on the internet means deleting information containing some specific contents. It means isolating and sealing in the electromagnetism. Normally, the good electrical conductor and magnetic conductor will be adopted to wrap up the part needed to be isolated, blocked and sealed to prevent radiation of the inside energy entering outside and prevent the outside energy from interfering with the inside. The practical products in the real life and production contain the shielding shell, case, cover and net; shielding cabinet; shielding house and shielding clothing and so on.

Source: http://www.hdtv-info.org/2011/09/14/the-cell-phone-jammer-or-cell-phone-shielding-system/

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