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Digital satellite TV programs on the encryption and decryption technology - satellite TV, digital en

By: frbiz

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"Encryption" technology to send TV signals on a particular scrambling processing, the receiver decoder must be connected people, but also in the pay-in period before normal viewing. Whether domestic or foreign satellite programs encryption, decryption must use a dedicated device to receive the current domestic and international satellite TV encryption systems used in several types of images and audio signals can be encrypted separately.

1, Satellite Four kinds of broadcast encryption systems
(1) France Telecom encryption (Viacess): This encryption method is the most common, mainly representatives 76.50E Broadcasting System Asia Pacific 211 live and Chinese broadcast system.

(2) Irdeto encryption (Irdeto); 110.50E Sino No. 1 on the transmission of CCTV and in some provinces with a total of 30 sets of programs CBTV, 78.50E Thai UBC satellite broadcast system No. 1, 1080E Indonesia's No. 1 broadcast telecommunications systems are used in the encryption.

(3) Pumpkin encryption (Nagravison): mainly 1460E Ma Buhai 2 Philippine Dream (DREAMBROADCASTINGSYSTEM) shows the main program, most of the 53 sets of programs in English, Chinese and European films and the program has no code of a program . In addition, 880E LBC satellite systems in Hong Kong on the use of encryption this way.

(4) En Disi encryption (Nds): 105.50E Asia 3S Phoenix movie set, 1160E of KOREASAT-3 (South Korea Mugunghwa 3) SKYLife broadcast system used in this encryption method, the encryption method more stable However, decoders expensive, usually TV station Special.

Other 105.50E of ZEETV encrypted using the Sena. There Conax, SkyCrypt other encryption.
2, video and audio signal encryption of several technical approaches
(1) Video RP: RP is to normal video signal, when received by ordinary Satellite receiver, TV shows image upside down, can not normally watch. However, this encryption confidentiality very poor, so we add a simple inverter can watch the video, especially now that most of the satellite receiver with a high local oscillator and low local oscillator frequency conversion technology, which satellite receiver must be set Video polarity switch. Just watch when the toggle switch can easily switch polarity video signal polarity.

(2) sine wave synchronous transfer: the technology is to increase the basic principle of a frequency equal to line or line-frequency harmonic frequency sine wave to the video signal, the video signal sync pulse by the interference of some synchronous pulse magnitude smaller, so that TV show's image can not be synchronized lock, roll or tear caused by television images. This scrambling method can also be easily solved, as long as the infringer to know the frequency of wave interference, plus in the video signal path in a simple filter, filter out interference wave can display normal images.

(3) pulse synchronous transfer: The basic method is to add people and synchronization pulse frequency of the pulse train with the video signal so that the sync pulse video signal is attenuated by compression, when the video signal sync pulse after attenuation , the rate has fallen below the rate of the video image signal, so using ordinary satellite receivers can not isolate the sync signal, the image can not be locked. Subject to the decryption device in a synchronous demodulation decoding circuit can be normal pulse signal.

(4) simultaneous substitution: the basic principle of simultaneous substitution method is the video signal lines in synchronization or frame synchronization pulse signal waveform substitution with non-standard, with data subcarriers instead of the original sync signal, sync signal included in the data sub-carrier in the. In the decryption device, the data demodulator can be used simultaneously demodulated signal to the image synchronization.

(5) active RP: Active RP encryption technology has a number of ways. One is the progressive video signal using inverse methods, and the other is to make some specific line of video RP, there is a use-by-field video signal inverting. Approach to the use of such encryption program encryption privacy better, there is no clear signal that the polarity of the line signal. In the decryption device, the signal to be sent to each line in turn 2.5MHz subcarrier synchronization, data audio signal, color subcarrier, phase identification keys and can decrypt the received image signal, respectively to the normal image and audio signals.

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