CN1152225A - Dynamic encryption and decryption method and communication equipment in secret phonetic broadcast and communication system - Google Patents
Dynamic encryption and decryption method and communication equipment in secret phonetic broadcast and communication system Download PDFInfo
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- CN1152225A CN1152225A CN 95114264 CN95114264A CN1152225A CN 1152225 A CN1152225 A CN 1152225A CN 95114264 CN95114264 CN 95114264 CN 95114264 A CN95114264 A CN 95114264A CN 1152225 A CN1152225 A CN 1152225A
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Abstract
In certain FM program channel for stereo broadcast and SCR program, one data communication channel is added. The data encoder transmits the cipher key via the data communication channel, so that the phonetic encrypting circuit in emission unit encrypts and the phonetic decrypting circuit in reception unit decrypts simultaneously to realize dynamic encryption and decryption. The present invention realizes random encryption of phonetic broadcast by setting a control unit in phonetic broadcast and communication system.
Description
The present invention relates to the communications field.
In the communications field, it is an important topic that analog voice signal is encrypted always.Along with development of science and technology, in the daily life, maintaining secrecy of analog voice also had urgent requirement, as mobile phone.Recently broadcast system requires the paid service of some voice program by encrypting realization information to charge to its broadcast for the needs of its economic interests.What this respect was used success is to utilize FM stereophonic broadcast, in its main channel, when broadcasting stereophonic broadcasting, increase by one tunnel FM broadcasting subchannel subsidiary communication authorization (Subcarrior Communication Authorily, be called for short SCA), by encryption, provide special SCA deciphering broadcast receiver to realize charge to the user to the SCA voice.Because this kind SCA encryption technology adopts the encryption chip in the cordless telephone that market circulation uses usually, the fixed-encryption bit encryption mode that this class chip adopts, operation principle are easy to understand, deciphering easily, confidentiality is poor.
The objective of the invention is at the problems referred to above, propose a kind of secret signalling, and adopt a kind of dynamic encryption mode at random to guarantee that the SCA broadcast receiver is not by imitated.
The solution of the present invention is in broadcasting a certain frequency modulation program frequencies channel of stereophonic program and SCA program, increase by a circuit-switched data passage again, data encoder is passed to voice encryption, decrypt circuit in emission, the receiving element by data channel simultaneously with encrypted secret key, it is carved at a time carry out the identical setting that adds, deciphers, thereby realize the purpose of dynamic encryption.
Above-mentioned data encoder can directly be passed to encryption key the encryption chip in the transmitter unit, and the deciphering chip in the receiving element delivered to encryption key synchronously by the transmitter in the transmitter unit.
Above-mentioned data encoder also can be delivered to transmitter with the modulation signal of output, by transmitter encryption key synchronization is passed to adding in transmitter unit and the receiving element, deciphering chip.
A kind of high secure voice broadcast communication system, its transmitter unit comprise audio frequency input, voice encryption device, encoder, frequency mixer and frequency modulated transmitter, it is characterized in that having a control system, comprise microcomputer, data encoder, data modem unit.And single-chip microcomputer, microcomputer sends the key data signal, by data encoder, modulation signal is delivered to frequency mixer, and synchronous signal is delivered to data demodulator, delivers to the voice encryption device after single-chip microcomputer is handled.
A kind of high secure voice broadcast communication system, its receiving element comprises FM demodulator, speech modulation demodulator, voice decipher, power amplifier loader and loud speaker, it is characterized in that having a control system, comprise data demodulator, single-chip microcomputer, the stereo full tunnel signal of output is delivered to speech modulation demodulator and data demodulator respectively after the FM demodulator received signal, data demodulator is exported a data-modulated ripple and is given single-chip microcomputer, by single-chip microcomputer processing signals is delivered to the voice decipher.
Now the invention will be further described with reference to the accompanying drawings:
Accompanying drawing 1 is the structured flowchart of broadcast transmission unit among the present invention.
Accompanying drawing 2 is structured flowcharts of broadcast reception unit among the present invention.
Accompanying drawing 3 is to realize accompanying drawing 1 electrical schematic diagram one.
Accompanying drawing 4 is to realize accompanying drawing 2 electrical schematic diagrams two.
Accompanying drawing 5 is to realize accompanying drawing 1 electrical schematic diagram two.
Accompanying drawing 6 is to realize accompanying drawing 2 electrical schematic diagrams two.
Accompanying drawing 7 is to realize accompanying drawing 1 electrical schematic diagram three.
Accompanying drawing 8 is to realize accompanying drawing 2 electrical schematic diagrams three.
Accompanying drawing 9 is another form structure block diagrams of broadcast transmission unit among the present invention.
Can find out SCA dynamic encrypting method and existing fixed-encryption device relatively by accompanying drawing 1, mainly increase the dynamic control mode position transfer system of voice encryption chip.This part is made up of microcomputer, data encoder, data modem unit, CPU control unit, in addition, has increased by one tunnel data-modulated ripple that has a data transaction encryption key in main channel.In the said apparatus, microcomputer can be with 286 above universal microcomputers, and data encoder can adopt RDS and other subchannel data encoder.Data modem unit can be with the chip of corresponding encoded device type (can be with 6579,7579 demodulation such as grade as RDS).And the CPU control unit can be used Inte18051, and Mc68HC series waits all available CPU.Encrypt IC and can other voice encryption chip of control mode setting be arranged with K2356, F224, FX214, FX234, TF12046FD etc.
Can find out that by accompanying drawing 2 the SCA dynamic resolution decryption method and the receiver circuit of existing fixedly SCA cipher mode compare, the dynamic encryption mode has increased by a circuit-switched data modulating wave demodulation, the data identification control unit of CPU, thus realization is to the synchronous setting that adds, separates mil of encryption chip.This part circuit FM demodulation can solve stereo full tunnel signal (comprising MPX in the 100KHz bandwidth, SCA, RDA channel) with 5710 and other FM radio demodulator circuit.Data modem can adopt the demodulation chip (as RDS with 6579,7579 etc.) of corresponding modulating mode.CPU can adopt single-chip microcomputer (as Inte18051 series, MC68HC series etc.).SCA voice demodulation IC can adopt narrowband speech fm demodulation chip (as 3361,3362,3363 etc.).Voice deciphering IC adopts identical chips with encryption chip generally speaking, and this chip generally all has encryption and decryption functions, and conventional chip is K2356, FX224, FX214, FX234, TF12046FD etc.
In the accompanying drawing 3,4, mainly adopt K2356,6579, three IC of 80C51 realize dynamic encryption.K2356 is that special use adds, deciphers IC as shown in Figure 2.This IC has 1 bit encryption not encrypt control bit (for not encrypting, " 1 " is for encrypting " 0 "), and two bit encryption mode bits are arranged.By changing this state of two (00,01,10,11), can determine to import corresponding four kinds of different encryptions of voice and export.Wireless deciphering IC is provided with three encrypted bits and to encrypt IC identical if decipher, and then this IC is reducible goes out former voice.In the foregoing circuit, adding, decipher IC all is to adopt K2356, just circuit is slightly variant, it adds, the decrypted state position is all controlled by 80C51, and specifically when the K2356 encrypted bits what is is provided with is determined by microcomputer software that fully SCA mistake sound is encrypted and the wireless voice of SCA are deciphered because micro-processor controlled transmission key data will be controlled simultaneously, therefore, the key data that microcomputer sends will pass through the RDS coded modulation, and it can be sent with SCA+MPX while frequency modulation.Therefore, CPU (80C51) has a data modulating wave demodulation IC (is 6579 to see Fig. 2 for RDS) to finish the process of data-modulated ripple restoring data in SCA voice encryption unit or the decrypting device.The IC detailed circuit can be referring to relevant IC data among the last figure.
Accompanying drawing 5,6 and accompanying drawing 3,4 differences are the extensive professional voice encryption chip FX224 of Low-Power CMOS that adopt Britain CML company to produce.This chip splits the input voice band and is slit into two frequency bands of height, modulate respectively with high section, low section carrier frequency, utilize two modulation sideband,s of the inverted height of switching capacity filter elimination then, the voice signal that the output common people can not read after adder is synthetic, i.e. voice encryption.FX224 has 32 kinds of different splitting and cuts frequency and radio combinations.These combinations can have fixed and two kinds of working methods of rolling type by the outside programming Control of 5 binary codes.Rolling type has 32 kinds to split the radio combinations of cutting Frequency point, has 6 kinds of rolling rates selective, has very strong confidentiality.Functions such as that this chip has in addition is synchronous, quiet, power saving, elimination and audio frequency bypass, these functions all can be by outside programming Control.Adopting FX224 as dynamic encryption usefulness, mainly is with its outside programing function, by changing the binary system control word of peripheral hardware pseudo noise code, changes different encrypted states.By microcomputer produce, transmit coding finish for dynamic encryption speech chip and dynamic SCA deciphering broadcast receiver deciphering chip to send out, receive encryption and decryption synchronously.
In the encrypted circuit, input audio signal IC1 buffering, IC2 amplifies, Rv1 reduces to 300mV (FX224 optimum operating voltage) with voltage, split cut frequency band before, signal will carry out soft limiting earlier.Remove the high frequency spike,, generate the wireless channel voice band of simulation then by IC3, the filtering of 3.4KHz filter circuit.Pseudo noise code is then controlled through the RDS coded modulation by microcomputer software, 6579 decodings, and 80C51 output control is provided with.Voice band input IC modulates, is inverted, and returns IC3 filtering (300～3400KHz).The secure voice frequency band of all generations and wireless transmission channel frequency band compatibility.The speech security signal is by the 7th pin output of IC3.
In the decrypt circuit, the encrypted speech signal when deciphering used imitative random code necessary identical when encrypting.Imitative random code is produced by microcomputer, pass to simultaneously by RDS add, decrypt circuit.In rolling type voice decrypt circuit, for preventing that circuit from producing transition when the code change, adopted noise suppression circuit, eliminated the transition that the FZ224 decipher causes the analog-to-digital conversion level when the code change by switching the output of IC6 analog switch, this switch switches also to be controlled by CPU (80C51).
This example and last two routine structures are basic identical, and institute's encryption chip that is not both adopts TF12046FD.This chip encryption principle and above-mentioned two kinds of chips are basic identical, and just function is simple.Have only two to encrypt two kinds of encrypted states of control bit THR01, THR02 control TF12046 and whether encrypts, whether filtering etc. when not encrypting, concrete chip application is seen interrelated data.
Theory diagram shown in the accompanying drawing 9 is basic identical with accompanying drawing 1, and close directly by data encoder control to encryption chip in the accompanying drawing 1, the encryption to encryption chip in the accompanying drawing 9 is to transmit signal controlling by the transmitter in the transmitter unit, and other is identical with accompanying drawing 1, does not repeat.
Claims (5)
1, a kind of high secure voice broadcast communication system, this system comprises receiving element and transmitter unit, and main channel is broadcast stereophonic broadcasting simultaneously, increase by one road voice charge program, dynamically the adding of this system, decryption method are in above-mentioned main channel, increase by a circuit-switched data, with encryption key, pass to adding in transmitter unit and the receiving element, deciphering chip simultaneously by data encoder.
2, dynamically adding in the high secure voice broadcast communication system according to claim 1, decryption method, it is characterized in that described data encoder directly passes to encryption chip in the transmitter unit with encryption key, the deciphering chip in the receiving element delivered to encryption key synchronously by the transmitter in the transmitter unit.
3, dynamically adding in the high secure voice broadcast communication system according to claim 1, decryption method, the modulation signal that it is characterized in that the output of described data encoder is delivered to transmitter, by transmitter encryption key synchronization is passed to adding in transmitter unit and the receiving element, deciphering chip.
4, a kind of high secure voice broadcast communication system, its transmitter unit comprises audio frequency input, voice encryption device, encoder, frequency mixer and frequency modulated transmitter, it is characterized in that having a control system, comprise microcomputer, data encoder, data modem unit and single-chip microcomputer, microcomputer sends the key data signal, by data encoder, signal is delivered to data demodulator, deliver to the voice encryption device after single-chip microcomputer is handled, the modulation signal of data encoder is delivered to frequency mixer simultaneously.
5, a kind of high secure voice broadcast communication system, its receiving element comprises FM demodulator, speech modulation demodulator, voice decipher, power amplifier loader and loud speaker, it is characterized in that having a control system, comprise data demodulator, single-chip microcomputer, the stereo full tunnel signal of output is delivered to speech modulation demodulator and data demodulator respectively after the FM demodulator received signal, data demodulator is exported a data-signal and is given single-chip microcomputer, by single-chip microcomputer processing signals is delivered to the voice decipher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95114264 CN1152225A (en) | 1995-12-15 | 1995-12-15 | Dynamic encryption and decryption method and communication equipment in secret phonetic broadcast and communication system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95114264 CN1152225A (en) | 1995-12-15 | 1995-12-15 | Dynamic encryption and decryption method and communication equipment in secret phonetic broadcast and communication system |
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| CN1152225A true CN1152225A (en) | 1997-06-18 |
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| CN 95114264 Pending CN1152225A (en) | 1995-12-15 | 1995-12-15 | Dynamic encryption and decryption method and communication equipment in secret phonetic broadcast and communication system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355314A (en) * | 2011-06-29 | 2012-02-15 | 哈尔滨工业大学深圳研究生院 | Broadcast information transmission method, server and terminal |
| CN102427394A (en) * | 2011-08-10 | 2012-04-25 | 叶林勇 | Encryption frequency modulation broadcast emission and receiving method and apparatuses thereof |
| CN104243138A (en) * | 2014-09-04 | 2014-12-24 | 南通北城科技创业管理有限公司 | Encrypted recording system based on singe chip microcomputer |
| CN105208490A (en) * | 2015-09-25 | 2015-12-30 | 王建忠 | Square dance audio system |
-
1995
- 1995-12-15 CN CN 95114264 patent/CN1152225A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355314A (en) * | 2011-06-29 | 2012-02-15 | 哈尔滨工业大学深圳研究生院 | Broadcast information transmission method, server and terminal |
| CN102427394A (en) * | 2011-08-10 | 2012-04-25 | 叶林勇 | Encryption frequency modulation broadcast emission and receiving method and apparatuses thereof |
| CN104243138A (en) * | 2014-09-04 | 2014-12-24 | 南通北城科技创业管理有限公司 | Encrypted recording system based on singe chip microcomputer |
| CN105208490A (en) * | 2015-09-25 | 2015-12-30 | 王建忠 | Square dance audio system |
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