CN1189031A - Analog signal launch modulating encryption and receiving control system - Google Patents
Analog signal launch modulating encryption and receiving control system Download PDFInfo
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- CN1189031A CN1189031A CN97116018A CN97116018A CN1189031A CN 1189031 A CN1189031 A CN 1189031A CN 97116018 A CN97116018 A CN 97116018A CN 97116018 A CN97116018 A CN 97116018A CN 1189031 A CN1189031 A CN 1189031A
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Abstract
An encrypting transmitter-receiver system for analog signals, especially the encrypting method for analog signals, is disclosed. Said system features that the form conversion of analog signals is used as modulation manner for transmitting, and said conversion is based on random function whose varying factor changes with time division or frequency division. The change value of random function is transferred by digital information. A digital instruction can instruct to restore the analog signals or not. Its advantages are low cost, high deencryption difficulty, and control to each receiving user by broadcast transmitting.
Description
The present invention relates to a kind of analogue signal encryption emission and receiving system, particularly analog signal is carried out the emission and the receiving system of transposition encryption mode.
The secrecy broadcasting system of prior art has following three kinds: 1, with the switching signal of digital signal as guiding, analog signal is not changed; 2, with setting means (as scramble or other variation pattern) to analog encryption.Above dual mode, because signal is that setting is constant, the cracker only will find corresponding changing pattern, just can crack.3, cardinar number code encryption owing to will be converted to digital code information to simulation (audio frequency), must adopt the language compression means again, so emission broadcasting cost and receiver cost are all high, the audience is difficult to accept, and this technology now only is used for senior Communication Equipments such as radio telephone.
The object of the present invention is to provide the analog signal of a kind of number and real-time change to blend together to be encrypted in to increase on the lower cost to crack difficulty and control each respectively and receive user by broadcast transmission.
Technical scheme of the present invention is such: analog signal launch modulating encryption and receiving control system, it receives controller by an analog signal launch modulating encryption machine with more than two and forms system, the band digital signal is assisted simultaneously at the launching simulation signal by system, it is characterized in that: the modulation system of analog signal emission is to adopt analog signal is carried out morphological transformation, and the demodulator of receiver makes it the analog signal reduction according to real-time digital code information and maybe can not reduce.
The invention has the advantages that: crack difficulty to increase on the low cost, receive the user thereby control each respectively by broadcast transmission.
Further specify the present invention below by accompanying drawing.
Accompanying drawing 1 functional-block diagram of the present invention;
The embodiment of accompanying drawing 2 secrecy broadcasting systems and receiver.
The course of work of accompanying drawing 1 statement is as follows:
1, audio signal conversion waveform morphology being varied to one is made up by various states The signal cohort, this signal cohort only be to former simple audio frequency carried out the differentiation and again Combination. The presentation of information has become, but the not change of the actual intension of information, and control Built in audiorange.
2, this presentation to original audio signal changes, by a random number that presets Operation is gone in the instruction that function generator is sent out. So when the recipient receives simultaneously synchronously Instruction, under the assistance of demodulator, can be with this continuous signal cohort of variation, Constantly restore.
3, when this technology is applied to broadcast, transmits and receives a shared cover and encrypt logical The letter agreement, respectively with software and hardware programming in the CPU of transmit modulator and receiver And among the communications protocol processor. The address code of each receiver also deposits in when start.
4, instigating the random number function change at random information of audio signal conversion waveform morphology to merge into improper audio signal with time-sharing procedure or frequency division method together with the address number after the coded communication protocol processes sends jointly with carrier wave.
5, the address code of receiver is as docking password, opening and closing of fault communications protocol processor and other signal processing circuit voluntarily after receiver is received, make the correctly demodulation or can't demodulation of mixed and disorderly audio frequency that receiver receives simultaneously, reach the purpose of start (the normal reception) lock machine (stopping to receive).
The conversion waveform morphology of above-mentioned audio signal can utilize the mode of shift frequency, frequency division and scramble to realize respectively, and adopt random number function to operate, and the changed factor of random number function changes with time-division and frequency division, random number function this time changing value, by the digital code information transmission.
Embodiments of the invention secrecy broadcasting system and receiver (accompanying drawing 2):
1, the audio signal of source of sound handles by frequency division/scramble that (select application-specific integrated circuit-SR2-312) for use, it is handled and handles application-specific integrated circuit-ALTERA.EPF8452 by communication protocol and be responsible for control.
2, be preset at audio signal that random number function X (n+1)=[A*X (n)+B] mod (C) and audio frequency in the memory internal storage 27C64 come as parameter factor X its result notification of hybrid operation EPF8452 in CPU-80C51.
3, among random number function X (n+1)=[A*X (n)+B] mod (C), A is the password of total platform control, and we have selected an equation with two unknowns X+Y+C=0 for use pin design A.X is the time-division parameter in the formula, and Y is the frequency division parameter, and C is a design specific cryptosystem (fixed number), and B is an address code, also is number of combinations a: B=n+A+C.N is the combinations of Hour Minute Second 6 figure places: promptly: 000001-010101-246060.
4, in converging by EPF8452, the audio signal that SR2-312 frequency division/scramble is handled filled the change at random function of concrete data, instant control command (containing B value address code), pass through buffer LM324 respectively, send to arrange under the time-division control requirement at EPF8452 and send modulation by serial port.
5, LM566 puts in order waveform modulated by phase bit comparison IC-4046A under LM324 assists.After cushioning amplifier again, modulation is gone into the audio frequency sound source and is carried out the FM modulation.
6, the mixed audio signal (closing digital command) after the modulation for the second time, by radio-frequency (RF) power amplification, outwards emission.
7, after receiver antenna receives this signal, at first carry out the FM demodulation with CXA1191IC, the former audio frequency that does not carry out encryption measures directly send loud speaker by LM324 in this way, and the mixed audio signal through above-mentioned processing enters demodulation for the second time through band pass filter in this way.
Mixed audio signal is placed on subchannel SCA modulation when 8, implementing experiment, so adopt MC3361 earlier this mixed signal to be reconciled once more, the digital command of reconciling out is checked to check through LM339 and entered application-specific integrated circuit-SSSRH02-02 and handle.
9, the A.B parameters such as (address codes) of the same formula X of random number function (n+1)=[A*X (n)+B] mod (C).Write equally among the memory internal storage 27C64 of receiver, and access at any time to the same formula X of receiver arithmetic unit 8051 usefulness (n+1)=[A*X (n)+B] mod (C) computing, CPU80C51 returns the frequency division/scramble processor SR2-312 of communication protocol processor SSSR02-02 by its receiver control to the operation result of the X dynamic parameter instruction that SSSRH02-02 sends here, makes the variation formula reduction of audio signal by the emission modulation.
The implementation result that above-mentioned enforcement is fallen is as follows:
This experiment is the SCA broadcast encryption by radio station FM frequency, receives in the SCA coverage and control, and receiver is good through the reduction of start processing audio; Error code instruction (being enclosed signal) is handled or carried to receiver on transmit modulator without start, normally demodulation of receiver, and what receive is that unmodulated mixes sound.
Claims (2)
1, a kind of analog signal launch modulating encryption and receiving control system, it receives controller by an analog signal launch modulating encryption machine with more than two and forms system, the band digital signal is assisted simultaneously at the launching simulation signal by system, it is characterized in that: the modulation system of analog signal emission is to adopt analog signal is carried out morphological transformation, and the demodulator of receiver makes it the analog signal reduction according to real-time digital code information and maybe can not reduce.
2, a kind of analog signal launch modulating encryption according to claim 1 and receiving control system, it is characterized in that: adopt random number function to operate analog signal morphological transformation mode, and the changed factor of random number function changes with time-division and frequency division, random number function this time changing value, by the digital code information transmission, make digital command make it the analog signal reduction and maybe can not reduce in the demodulator of receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97116018A CN1077751C (en) | 1997-12-25 | 1997-12-25 | Analog signal launch modulating encryption and receiving control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97116018A CN1077751C (en) | 1997-12-25 | 1997-12-25 | Analog signal launch modulating encryption and receiving control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1189031A true CN1189031A (en) | 1998-07-29 |
| CN1077751C CN1077751C (en) | 2002-01-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97116018A Expired - Fee Related CN1077751C (en) | 1997-12-25 | 1997-12-25 | Analog signal launch modulating encryption and receiving control system |
Country Status (1)
| Country | Link |
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| CN (1) | CN1077751C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362781C (en) * | 2002-12-06 | 2008-01-16 | 中国电子科技集团公司第三十研究所 | Method of utilizing special equipment with A/D converter in generatnig message cipher key |
| CN101793114B (en) * | 2010-01-14 | 2013-01-23 | 杭州六易科技有限公司 | Signal encryption type safety remote control lock for automobiles |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005216027A (en) * | 2004-01-30 | 2005-08-11 | Matsushita Electric Ind Co Ltd | Encryption device, encryption system therewith, decryption device and semiconductor system therewith |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5398284A (en) * | 1993-11-05 | 1995-03-14 | United Technologies Automotive, Inc. | Cryptographic encoding process |
| CN1141559A (en) * | 1995-06-07 | 1997-01-29 | 株式会社东芝 | Secrecy broadcasting system |
-
1997
- 1997-12-25 CN CN97116018A patent/CN1077751C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362781C (en) * | 2002-12-06 | 2008-01-16 | 中国电子科技集团公司第三十研究所 | Method of utilizing special equipment with A/D converter in generatnig message cipher key |
| CN101793114B (en) * | 2010-01-14 | 2013-01-23 | 杭州六易科技有限公司 | Signal encryption type safety remote control lock for automobiles |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1077751C (en) | 2002-01-09 |
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