CN2171184Y

CN2171184Y - Interpretive code receiver for receiving T.V. signal with code

Info

Publication number: CN2171184Y
Application number: CN 93225727
Authority: CN
Inventors: 宋世鹏
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-05-20
Filing date: 1993-05-20
Publication date: 1994-07-06
Anticipated expiration: 2003-05-20

Abstract

The utility model relates to an interpretive code receiver for receiving TV signals with codes, which comprises a circuit board, a decoding box, a switch, an in-out line socket, and a housing, wherein, the circuit board comprises a high frequency turner, an IPA channel, a video output, a decoding circuit, and a modulator test; the decoding box and a decoding card is combined into a whole, which is an assembly and disassembly type in structure relative to the whole interpretive code receiver for receiving TV signals with codes. A pseudo-random code which is used for controlling encryption of the TV signals through the change periodically or non-periodically to request users to change corresponding decoding cards necessarily, and otherwise TV programs with encrypting TV signals can not be watched normally so that the purpose of charging is achieved.

Description

Interpretive code receiver for receiving T.V. signal with code

The utility model belongs to the TV transmit-receive technology, the deciphering receiving system after particularly TV signal is encrypted.

The pay TV technology develops rapidly, but the present signal that sends is not all encrypted.User applies is by watching after the dress, and its reimbursement of expense way is divided into the administration fee that installation fee reached every month later on or collected in per season.Disposable fund ratio was easier to collect when according to the actual fact, the initial stage was by dress.Month by month by the phase charge,, be again long-term work in the use because relate to huge numbers of families, quite loaded down with trivial details, and workload is big, and the contradiction that produces different situations is also a lot.People wish to have a kind of TV tech of being convenient to toll administration to occur.

The purpose of this utility model is to disclose a kind of decoding casket to society to be injected into one with the decoding card, and complete machine is the receiver decoder of the reception civision of loading and unloading type structure relatively.

The utility model is achieved in that the receiver decoder after a kind of TV signal is encrypted, and comprises circuit board, decoding casket, switch, turnover line socket and housing.Circuit board comprise high-frequency tuner, in put passage, video output, decrypt circuit, tuner test; Be characterised in that decoding casket and decoding card are injected into one, complete machine is the loading and unloading type structure relatively, collects the charges by transposing decoding casket and decoding card; Switch comprises mains switch and indication, channel selection, and the leading-in socket power supply is looked antenna and is inserted, and comprises with received television signal and encrypts the back TV signal, socket occurs for TV set aerial usefulness, thus television set and receiver decoder is linked up.Whole TV signal encryption and decryption principle is that the TV signal of emission is given encryption earlier.The composite colour television signal of input is divided into two-way behind input circuit, the one tunnel through synchronous back porch clamp, stable DC level, the external line synchronizing signal of cancellation in synchronous blanking circuit; In the encryption synchronisation supercircuit, will encrypt (front/rear displacement) row again and be superimposed upon synchronously on the TV signal of input, at last by output after output circuit ride gain, frequency response and the DC level.Another route digital circuit constitutes, TV signal is carried out separated in synchronization, produce the front/rear amount of moving of line synchronizing signal behind formation back porch clamp pulse, the synchronous blanking pulse, the encrypted code generator produces pseudorandom encrypted code according to the eight-level code state of setting (0 or 1), encrypted code repeats once after some, and the encryption synchronisation pulse is subjected to the control of encrypted code generator.The control line synchronizing signal is front/rear to move each about 1,5us, make the television image of receiving without the television receiver of corresponding sign indicating number deciphering be irregular about distortion.The front/rear mobile of line synchronizing signal with one group of 4 behavior in the composite video signal also is the control that is subjected to the binary code of pseudo noise code, and per 5 of control code repeats once.In when deciphering, as long as and 8 bit codes of drawing input have one to make mistakes, after becoming the pseudo noise code of serial, can't go to disturb.Strange the different of direction of displacement with idol field corresponding row will be caused tearing of image, and in this case, the user has only the decoding card that will be used to decipher to change into to record with the corresponding to decoding card of 2 ary codes of pseudo-machine and can normally watch charging TV program.Decryption method is such, and the TV signal that decryption receiver receive to be encrypted is amplified and detection in intermediate-frequency channel selected the signal of broadcasting channel by high-frequency tuner after.After separating input signal, decryption receiver detects the original bench mark of encrypted code.Cipher code generator is provided with 8 bit code states by the decoding card, has only the in full accord of 8 bit code states and transmitting terminal, and the row of encrypted displacement side synchronously can return to the normal position, through the vision signal of decryption restoration normal synchronized, exports behind high-frequency tuner.The ordinary television receiver that adds the direct watching encrypted signal of secret emissary with the method that is shifted synchronously in the TV signal can't obtain stable image.And after deciphering, do not influence picture quality basically.The utility model can be regularly or the irregular change control TV signal pseudo noise code of encrypting, thereby come the requirement user must change corresponding decoding card, otherwise normal watching encrypted TV signal has then alleviated the workload and the difficulty of charging.

Realization of the present utility model is convenient to pay TV and is sticked into the row charge by changing decoding casket and decoding, help applying of pay TV, and the utility model is implemented easily the reliability height.

Accompanying drawing 1 is the utility model schematic diagram.

Accompanying drawing 2 is the utility model circuit block diagrams.

Accompanying drawing 3 is the utility model sign indicating number card casket schematic diagrames.

Accompanying drawing 4 is the utility model decoding card schematic diagrames.

1 mains switch among the figure, 2 indicator lights, 3 channel selections, 4 decoding card caskets, 5 antennas insert mouthful, 6 TV set aerial are inserted mouthful, put passage in 7 high-frequency tuners, 8, the output of 9 videos, 10 decrypt circuits, 11 modulator test signals, 12 television receivers, 13 signal receiving antennas, 14 integrated circuits, 15 decodings block, 16 conductive base pins.

In the utility model implementation process, circuit engineering is open, and the number of patent application of open file is 91107402.3.The product that the decoding card adopts black horse mountain microelectronics factory of Ministry of Astronautics Industry to produce, for example decoding integrated circuit of MM0.1～MM12.The decoding card is pressed in the decoding casket in the implementation process, and the decoding casket is a loading and unloading type for deciphering machine, can change.

Claims

1, a kind of receiver decoder that receives civision, formed by circuit board, decoding casket, switch, turnover line socket and housing, the casket that it is characterized in that decoding is injected into one with the decoding card, and complete machine is the loading and unloading type structure relatively, collects the charges by transposing decoding casket and decoding card.