CN2455016Y - Cable TV all-channel analogue jamming/descrambling device capable of addressing - Google Patents
Cable TV all-channel analogue jamming/descrambling device capable of addressing Download PDFInfo
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- CN2455016Y CN2455016Y CN00260972U CN00260972U CN2455016Y CN 2455016 Y CN2455016 Y CN 2455016Y CN 00260972 U CN00260972 U CN 00260972U CN 00260972 U CN00260972 U CN 00260972U CN 2455016 Y CN2455016 Y CN 2455016Y
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- 238000001914 filtration Methods 0.000 claims description 6
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Abstract
The utility model relates to a cable TV all-channel analogue scrambling /descrambling device capable of addressing. The utility model scrambles the cable TV all-channel radio frequency signal one time only on the front end and is connected with a scrambler by a time-delay drive circuit. Cryptographic user address dates, a control signal and a signal wave which generates a scrambling rectangle are combined and then are delivered to the all-channel television network in order to be matched to descramble out information. Consequently, the users who pay on time can use the descrambler to run all-channel amplitude descrambling and the users who do not pay on time can only receipt the scrambling video signal. The illegally poled users can not watch the programs.
Description
The utility model provides a kind of cable TV signal is added the device of scramble process, i.e. (addressable) cable TV all-channel simulation adds/descrambler.
Since the development of wired TV, the charge of cable TV just is puzzlement various places cable television operator's a hang-up always, and the manufacturers of cable TV are always for seeking a kind of safe, effective and economic adding/de-scrambling method and device painstakingly.Existing radio frequency analog adds descrambler and has advantage on the price because of it, always good by operators, but add at existing radio frequency analog/descrambler in, all in the front end scrambling, its common feature all is to handle on single channel, promptly carry out scrambling by radio frequency, the intermediate frequency (or video) to single television channel respectively, then, after each channel signals mixed, send into cable TV network, send to user side and carry out the sub-channel descrambling, its cost is difficult to drop to minimum, add/cost performance of descrambler can not allow customer satisfaction.And another kind of employing terminal is turn-offed or the simulation scrambler of electronic switch scrambling, and its fail safe makes the user worry again.For improving the rate of charge of cable TV license fee, good the adding of a kind of cost performance of cable TV market in urgent need/descrambler.
The purpose of this utility model is: a kind of " (addressable) cable TV all-channel simulation add/descrambler " is provided, and especially safe, efficient, economy and high the adding of cost performance/descrambler, and have the function of addressing.
The simulation of the purpose of this utility model is achieved in that a kind of (addressable) cable TV all-channel adds/descrambler, and delay driving circuit, cable TV all-channel switching pad (scrambler), the signal generator that produces pilot tone, modulation circuit and wide-band amplifier that described scrambler comprises the memory of depositing station address and user watched control signal, the microcontroller that produces scrambling square-wave signal and encrypting user address and user watched control signal, delay time to the scrambling square wave are formed.Microcontroller produces scrambled signals, and connects scrambler through behind the delay driving circuit.In addition, the circuit that the information of station address data, control signal and the generation descrambling square wave encrypted in the memory is made up and descrambling square wave information and station address data, scrambling control information is modulated on the pilot tone; The amplifying circuit that full channel tv signal to scrambling mates, isolates connects cable TV network.Descrambler comprise input amplifier, pilot tone tell the decrypt circuit of the synchronous descrambling square wave of circuit, pilot filtering amplification, demodulation, shaping circuit, generation, by the descrambling rectangular wave drive, the scrambling full channel tv signal is carried out descrambling circuit, amplification output circuit composition, input amplifier is told circuit and pilot filtering amplification, demodulation, shaping circuit through pilot tone, pass through decrypt circuit and descrambling circuit again, the full channel tv signal behind the descrambling is isolated amplify output.
The utility model adopts square wave control scrambling and descrambling switching regulator attenuator, and cable TV all-channel radiofrequency signal is carried out scrambling and descrambling.Adopt pilot tone to transmit descrambling square wave and addressable enciphered data and control information to user's descrambler.The device (descrambler) that carries out descrambling at user terminal is the mapping of scrambler.According to provided by the utility modelly add, descrambler, at front end the all-channel cable TV signal is carried out the amplitude scrambling, carry out all-channel amplitude descrambling at user side, one is exactly must be consistent in all-channel in the scrambling degree of depth of front end and the degree of depth at the descrambling of user side, the utility model patent adopts a kind of switching regulator attenuator of all-channel, guarantees the scrambling degree of depth in the all-channel and the consistency of the descrambling degree of depth; Its two, requiring must be consistent with the square wave width of front end scrambling at the square wave of terminal descrambling, and aims in time.In the utility model, front end adopts microcontroller reference signal frequency division to produce the control signal of scrambling square wave and user side descrambling square wave, and in scrambler, increasing delay circuit, descrambling square wave and scrambling square wave that user side is produced are anti-phase fully synchronously.Its three, the disposable scrambling of all-channel must increase to transmit produce the signal path of descrambling square wave and station address data and control information, the utility model adopts pilot tone to transmit.
The utility model is by carrying out predelay and scrambling to the scrambling square-wave signal.In fact both can carry out scrambling to some channel according to user's demand again to the all-channel scrambling.
It directly carries out scrambling with the wide band switching of square wave control to cable TV all-channel radiofrequency signal at front end, and the TV signal that is subjected to each channel in the whole network of scrambling control makes the user of illegal access all by scrambling, and signal can't teleview; Front end after scramble information, addressable user descrambling data and subscriber control information encryption, transmits by the descrambler of pilot tone to user side when carrying out scrambling.At user terminal, by descrambler, solve encryption address sign indicating number, control information and descrambling square wave, control wide band switching descrambler has been realized descrambling control to the radio frequency cable TV signal of delivering to television set effectively.
Characteristics of the present utility model are: and (addressable) cable TV all-channel simulation adds/and descrambler takes to carry out the all-channel scrambling on radio frequency, taked certain encryption measures again, therefore, can reach little, the good confidentiality of television video frequency signal damage, need not do any change to network, and the low requirement of price.The utility model and characteristics also comprise: cable TV all-channel radiofrequency signal is carried out disposable scrambling, these characteristics are simplified headend equipment, cost reduces, simultaneously, can make each television channel in the whole cable TV network all by scrambling, strengthen the thief-proof ability of looking of cable TV network, prevented disabled user's access effectively.Terminal at cable TV network, the user who normally pays dues is by using descrambler, after encryption addressable data that transmit according to pilot tone and control information sign indicating number are decrypted, cable TV signal is implemented descrambling, just obtained TV signal for the normal rating of user.
The utility model is described in further detail below in conjunction with accompanying drawing and by embodiment:
Fig. 1 is the functional-block diagram of scrambler of the present utility model
Fig. 2 is the functional-block diagram of the utility model descrambler
Fig. 3 is the circuit diagram of the utility model front end scrambler
Fig. 4 is the circuit diagram of the utility model user side descrambler
As shown in Figure 1: (addressable) cable TV all-channel simulation scrambler theory diagram:
PC controller in the system carries out toll administration, produces station address and control signal, send microcontroller and memory; The composition of the utility model scrambler:
Memory: deposit station address and user watched control signal;
Microcontroller: produce the scrambling square-wave signal, and, produce encrypting user address and user watched control signal according to the data in the memory;
Delay driving circuit: after the scrambling square wave delayed time, drive scrambler;
Scrambler:, modulated full channel tv signal is carried out scrambling for cable TV all-channel switching pad;
Combinational circuit: with the capable combination of signal wave of station address data, control signal and the generation descrambling square wave encrypted;
Pilot tone generator: produce stable pilot signal;
Modulation circuit: scrambling square wave and station address data, scrambling control information are modulated on the pilot tone;
Wide-band amplifier: the full channel tv signal to scrambling is sent into cable TV network after mating, isolate amplification.
As shown in Figure 2: the functional-block diagram of descrambler (Fig. 2) illustrates:
Input amplifier: isolate the scrambling full channel tv signal that amplifies cable TV subscriber's end;
Pilot tone is told circuit: draw pilot signal along separate routes;
Pilot filtering amplification, demodulation, shaping: leach and amplify pilot signal, demodulation is also amplified shaping;
Deciphering: separate, decipher, produce the descrambling square wave;
Descrambler:, the scrambling full channel tv signal is carried out descrambling by the descrambling rectangular wave drive;
Amplify output: the full channel tv signal behind the descrambling is isolated amplify output.
The circuit diagram of the utility model front end scrambler is seen Fig. 3:
Modulated all-channel cable TV signal from Headend enters this scrambler through the input circuit of cable TV F socket and input attenuator.1 scrambler for the wideband switch composition (switching diode V6, V7 and T shape attenuator R22 ~ R24); 2 is the pilot tone place in circuit, and 3 for output is isolated, the wide-band amplifier (A1) of amplification; 4 is modulation circuit; 5 pilot signal source for the PLL formation, U11 is the PLL circuit, and U12 is a pre-divider, and V1 is a varactor, and V2 is VCO, and ATT1 is the pilot amplitude attenuator, and U14 is that pilot tone output is amplified, and BPF1, BPF2 are pilot filter 10; 6 is delay circuit; 7 involve generation (U1 ~ U8) and the combinational circuit (U9) of control signal for addressing information, descrambling rectangle; 8 is power circuit, adopts the Switching Power Supply of 24v, 12V and 5V output.Cable TV signal after scrambling enters cable TV network, is sent to each user.Like this, in by the whole cable TV network of scrambling, cable TV signal must just can be watched normal TV signal with descrambler all by scrambling.
The circuit diagram of the utility model user side descrambler is seen Fig. 4:
Full channel tv signal through scrambling, be added to the descrambler input, isolate amplification through wide-band amplifier 21, telling circuit 22 through pilot tone again separates, main road is to descrambler 26, (V6 ~ V9) and after the demodulation amplify, shaping (U4) circuit 23 are added to logic control circuit (logic gates U1) 24 to branch road after shaping, solve station address data and control information through pilot filtering, amplification, demodulation.Station address data and control information are through circuit 25 (microprocessor U2 and memory U3) deciphering and identification, and control produces the descrambling square wave.To validated user, will produce the descrambling square wave, and the descrambling square wave is added to descrambler 26.Like this, just the full channel tv signal through scrambling is realized descrambling, make the normal rating of user.To the user who does not pay dues on time, do not produce the descrambling square wave, its TV signal is just by scrambling.The illegal user who inserts can't rating because of no descrambler.27 is the TV signal input circuit, and 28 is power circuit.
It is easy to use that the utility model adds descrambler.At front end,, rationally adjust signal level and get final product as long as scrambler is inserted network.At user side,, need not anyly adjust as long as descrambler is inserted between user's cable TV socket and the television set just passable.
Claims (3)
1. (addressable) cable TV all-channel simulation adds/descrambler, it is characterized in that described scrambler comprises the memory of depositing station address and user watched control signal, produce the microcontroller of scrambling square-wave signal and generation encrypting user address and user watched control signal, the delay driving circuit that the scrambling square wave is delayed time, cable TV all-channel switching pad, produce stable pilot signal generator, modulation circuit and wide-band amplifier are formed, microcontroller links to each other with address signal with memory control, and connect scrambler behind the process delay driving circuit, station address data through encrypting again, the circuit that the signal wave of control signal and generation scrambling rectangle makes up, and with scrambling square wave and station address data, the scrambling control information is modulated on the pilot generator, full channel tv signal to scrambling mates, connect cable TV network through isolating amplifier circuit, pilot circuit connects transmission descrambling square wave and addressable enciphered data and control information to user's descrambler by cable TV network; Descrambler comprises that input amplifier, pilot tone tell decrypt circuit, the foregoing circuit of the synchronous descrambling square wave of circuit, pilot filtering amplification, demodulation, shaping circuit, generation and connect successively, connect circuit, the amplification output circuit that the scrambling full channel tv signal carries out descrambling by descrambling rectangular wave drive signal, amplify output and tell circuit and pilot filtering amplification, demodulation, shaping circuit through pilot tone, pass through decrypt circuit and descrambling circuit again, the full channel tv signal behind the descrambling is isolated amplify output.
2. add/descrambler according to the simulation of claim 1 described (addressable) cable TV all-channel, it is characterized in that adopting square wave to connect scrambling (1) and descrambling switching regulator attenuator (26).
3. add/descrambler according to claim 1, the simulation of 2 described (addressable) cable TV all-channel, it is characterized in that connecting predelay circuit (6) after the scrambling square-wave signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00260972U CN2455016Y (en) | 2000-06-19 | 2000-10-31 | Cable TV all-channel analogue jamming/descrambling device capable of addressing |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00220729.X | 2000-06-19 | ||
| CN00260972U CN2455016Y (en) | 2000-06-19 | 2000-10-31 | Cable TV all-channel analogue jamming/descrambling device capable of addressing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2455016Y true CN2455016Y (en) | 2001-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00260972U Expired - Fee Related CN2455016Y (en) | 2000-06-19 | 2000-10-31 | Cable TV all-channel analogue jamming/descrambling device capable of addressing |
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| Country | Link |
|---|---|
| CN (1) | CN2455016Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101151866B (en) * | 2005-03-29 | 2011-11-09 | 松下电器产业株式会社 | Self-adaptive modulation with non-pilot symbols |
-
2000
- 2000-10-31 CN CN00260972U patent/CN2455016Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101151866B (en) * | 2005-03-29 | 2011-11-09 | 松下电器产业株式会社 | Self-adaptive modulation with non-pilot symbols |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |