CN204031141U - A kind of dicode receiver - Google Patents
A kind of dicode receiver Download PDFInfo
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- CN204031141U CN204031141U CN201420514720.5U CN201420514720U CN204031141U CN 204031141 U CN204031141 U CN 204031141U CN 201420514720 U CN201420514720 U CN 201420514720U CN 204031141 U CN204031141 U CN 204031141U
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Abstract
A kind of dicode receiver, belongs to electronic technology field.A kind of decoding circuit is proposed, by radio frequency reception demodulator circuit, external reception antenna, decoding integrated circuit, performance element, the change decoding circuit of suspension change 1 forms the receiving lines that can receive and become code jointly, in an initial condition, first of decoding integrated circuit exports no-voltage, after reliable reception first time transmits, first of decoding integrated circuit exports high-order output, primary suspension code successfully becomes by the change decoding circuit starting suspension change 1 holds " 1 " code after corresponding conversion with the change code launching integrated circuit of encoding, reliable reception second time transmits, excitation performance element, realize the reception that " suspension " and " 1 " code that radiating portion sends exchanges, good condition is created for realizing twice emitting, the to encode integrated circuit of class of tri-state has been allowed to possess and highly difficult crack ability, the more wide space that allowed the development of telecontrol engineering have.
Description
Technical field
Belong to electronic technology field.
Background technology
Society is improving, and science and technology is in development, and remote control product progressively replaces manual product, and particularly some senior anti-theft safety doors, have also used telecontrol engineering.
As everyone knows, application remoting technology, first just must encode, and the major significance of its coding avoids being cracked by other people.So the quality of coding level of confidentiality, be directly connected to the quality of product quality.If coding is too simple, is all 1 or is all 0 as whole code line, be just easy to be cracked by people, if anti-theft product, those security personnel are just performed practically no function, and the level of confidentiality of thus encoding is directly connected to the quality of product.With present market, if be thought of as low, it is exactly so the coding being encoded to three kinds of states, with 2262 for representative, this integrated circuit cost is low, make product and have very large price advantage, but coding is simple, level of confidentiality is not high enough, so can not use in high-end product widely, single ripple dicode that our unit had once succeeded in developing multiple change code launches Decision Making of Line Schemes, good condition is provided to the level of confidentiality degree improving coding, but also need with it corresponding decoding technique just can become a complete entirety, receive and the matched well of launching, promote an outstanding key factor of remote control properties of product, therefore, according to the transmitting Decision Making of Line Schemes of the single ripple dicode applied for, the circuit that development dicode receives, for the extensive utilization of remote control product lays the first stone.
Summary of the invention
The main purpose of this patent proposes a kind of decoding circuit, create the receiving lines that can receive change code to match with the single ripple dicode launch scenario applied for before our unit, realize the reception that " suspension " and " 1 " code that radiating portion sends exchanges, good condition is created for realizing twice emitting, allow the price that product keeps it cheap, remote control product the is possessed highly difficult anti-ability of cracking, for the extensive utilization of remote control product lays the first stone.
The measure that this patent proposes is:
1, a kind of dicode receiver is made up of jointly the change decoding circuit of radio frequency reception demodulator circuit, external reception antenna, decoding integrated circuit, performance element, suspension change 1.
Wherein: external reception antenna is connected to the input of receiving demodulation circuit, the output of receiving demodulation circuit connects the input of decoding integrated circuit, first of decoding integrated circuit exports the change decoding circuit connecting suspension change 1, and second of decoding integrated circuit exports and connects performance element.
8 bit code positions, 7 live wires connecting ground wire or connection decoding integrated circuit wherein of decoding integrated circuit become fixed code, and another one connects to becoming with the change decoding circuit of suspension change 1 and becomes code end.
The change decoding circuit of suspension change 1 is made up of not gate, PNP triode, bleeder circuit.
First of decoding integrated circuit exports the input connecting not gate, the input of not gate connects a resistance to earth, the output of not gate connects the base stage of PNP triode, bleeder circuit is formed by upper inclined resistance and lower inclined resistance, one end of upper inclined resistance connects power supply, the lower inclined resistance of other end series connection is to ground, and the emitter of PNP triode connects series connection point, and the collector electrode of PNP triode connects change code end.
2, decoding integrated circuit used is non-locking type.
3, the connection of 7 fixed code of decoding integrated circuit should be identical with the connection of the fixed code of integrated circuit of encoding in transmitting.
4, external reception antenna is connected with shielding conductor with between receiving demodulation circuit.
5, external reception antenna is coil antenna.
This measure is explained as follows further:
1, for the previous period, the cardinal principle that single ripple dicode that our unit develops is launched:
In the transmission, coding integrated circuit has 8 bit code positions, wherein 7 is fixed code, another one, for becoming code code, when launching, launch two subcategory numbers, wherein transmitter code is 7 fixed code for the first time, with the first subcategory number of the variation code of, the code that second time is launched is 7 constant fixed code, and the coded signal after the variation of a variation code.Corresponding with the receiving unit in the utility model, in decoding integrated circuit, 7 fixed code are identical with 7 fixed code of integrated circuit of encoding in transmitting, and the first time signal of variation code in decoding integrated circuit is " suspension ", coded signal after second time variation is " 1 ", and present receiving lines of the present utility model, reliably will can receive the variation code sent for the first time is exactly " suspension ", and second time signal is the signal of " 1 ".
2, in this measure, the structure of twice decoding of generation is: 7 bit codes in integrated 8 bit codes of decoding have been connected into fixed code (03 in Fig. 1), a wherein bit code is become receipts twice signal is a kind of changes code (04 in Fig. 1).When initial condition, the code bit wherein originally presented all the time for displacement code bit is the stationary state of " suspension ", and generation change code just produces after receiving signal.Decoding integrated circuit in the present invention has two outputs, wherein first output (05 in Fig. 1), and being also called is automatic changing code control end, and the output of this end is connected with the change decoding circuit of suspension change 1.Another one is that second exports (07 in Fig. 1), and also known as the output to rear class, this output rear class is connected, and is directly export decoded result at the corresponding levels.The structure of this circuit can realize the present invention and receive the requirement becoming code.In above-mentioned line construction, first of decoding integrated circuit exports the change decoding circuit that connected electronic switch is called suspension change 1.
3, become code produce suspend with 1 reason of exchanging be: when decode integrated first export no-output into zero time, the inverter output connected is for high-order, and PNP triode base stage has voltage, its collector electrode no-output, the change code end connected both did not connect power supply and ground wire, was suspension.Otherwise export as time high when integrated first output of decoding has, there is bias current in the PNP triode base stage connected, exports so its collector electrode exists, and the change code end connected is a high position, this completes the conversion suspended with 1.
4, the single ripple dicode once applied for our unit invents the decoding principle matching and produce.
This circuit produces four kinds of functions and corresponding principle:
(1) receive the first subcategory number of sending of radiating portion principle: as in Fig. 2, under initial condition, first of decoding integrated circuit exports no-voltage, and the output of not gate is high-order, and PNP triode is off-state, collector electrode electricity neither connects power supply, also unearthed line, in " suspension " state, with radiating portion first signal " suspension " sending out corresponding, because its principle does not run counter to the performance of existing product, so can transmit reliable reception first time.
(2) receive the second subcategory number of sending of radiating portion principle: after receiving the first signal sent, at this moment encode integrated circuit first output export 1 signal, the output of not gate is low level, make in PNP triode conducting state, collector voltage raises, the change code end of the decoding integrated circuit connect presents one state, and to become coded signal " 1 " corresponding with the second time of radiating portion, thus can receive second that radiating portion sends and become coded signal.
(3) receive twice change code and have the strict demand of sequential and principle: twice signal sequence requiring radiating portion to launch of the present invention has strict demand, (main cause be criminal commit a crime difficulty) can not be disorderly.Its reason is that after only having first time to launch correct code " suspension ", the decoding integrated circuit in the present invention first output just has output, thus makes the decoding integrated circuit in the present invention produce the new code of " 1 ".Cause the reception of second time signal.If instead criminal is the signal first launching second time " 1 ", now because the code of decoding integrated circuit of the present invention is in the state of " suspension ", does not meet with transmitter code, do not have output.So twice signal that radiating portion sends has strict timing requirements.
(4), there is reception time limit requirement, (its benefit greatly can improve the ability of cracking) principle: the transient state output type coding integrated circuit that its decoding integrated circuit adopts in this measure, its benefit is, coding integrated circuit is after receiving the signal sent for the first time, first output has high-order output, but be not permanent, second time signal can only be received time of short duration, otherwise from action expense.Need again to receive first time signal, could secondary signal be received.Thus to crack and must form four factor.Thus the level of confidentiality cracked is greatly increased.
5, the not circuit used in measure 1, for logical inversion, has good carrying load ability, when voltage is by high step-down, has cushioning effect, the PNP triode of rear class can not be damaged.
6, the effect of bleeder circuit that connects of triode emission: mainly form dividing potential drop relation, to adapt to the voltage needed for different coding integrated circuit, two is can adjust coding integrated first flexibly to export as time high-order, causes the reverse bias to this pipe.
7, radio frequency reception demodulator circuit has also connect external reception antenna, connects, enhance receiving sensitivity to a great extent with shielding conductor.
After the invention process, after coordinating with the radiating portion applied for before our unit, below outstanding feature:
1, the reception that " suspension " and " 1 " code that radiating portion sends exchanges is achieved, good condition is created for realizing twice emitting, keep the price that it is cheap, remote control product the is possessed highly difficult anti-ability of cracking, for the extensive utilization of remote control product lays the first stone.
If 2 with the combination again of rolling code circuit, it decodes difficulty is superpower, because rolling code is the coding of a class character, and in this measure, dicode transmitting is the coding of a class character, two kinds of coded combinations of different nature are larger than a kind of code breaks difficulty of character.
3, the dicode receiving lines of this measure receives reliable:
Its reason is that the decoding integrated circuit fixed code in the present invention conforms to completely with the fixed code of radiating portion.And the change code part received, signal code is " suspension " for the first time, and the code of second time signal is " 1 ", and the twice change code sent with radiating portion definitely conforms to, and signal is " suspension " for the first time, and second signal is also " 1 ".Have followed the rule of this kind of coder and decoder ic completely.Another very important reason is, what the decoding in receiving lines in the present invention realized is " tracking system ", that is to say after receiving first change code " suspension ", just automatically becomes the code " 1 " needed for second time, twice receiving course is not disorderly, onside.
4, crack very difficult: mainly contain three reasons, one is to have twice different code could realize decoding, just has output.Two is that different code needed for twice has timing requirements, can not be disorderly, 3rd major reason is, the requirement that this twice different change codes is also necessary free when launching, because the integrated output of the coding adopted in the present invention is the transient state output type adopted, in other words after receiving signal, its output can only remain a transient state high position, will disappear after blink.If criminal, after correct code is made in exploration in first time, want that within the very of short duration time, feel out the correct code of second time is more obviously very difficult.Also be that criminal wants to crack the present invention must by three passes: one is must twice different dicode, and two is also must have sequential, and three is also must be limited within the very short time just can complete, and therefore adopts " the barcode scanning instrument " of crime to crack and hardly may.From in a certain respect, higher than rolling code, because crack rolling code in theory, there is certain probability in this level of confidentiality, and just this probability is very low, very low, and the present invention is because exist the above-mentioned three elements that crack, and this to crack probability just lower.
5, circuit is reliable, and one is that circuit is simplified, and two is that not gate has good carrying load ability, when voltage is by high step-down, has cushioning effect.
6, the utilization of external reception antenna, greatly enhances the sensitivity of reception.
7, produce easily, one be need not be valuable equipment and instrument, two is that technology is simple, and three are that circuit is simplified and component requirements used is low, so can produce very high first-pass yield, very applicable minuscule-type-enterprise produces.
Accompanying drawing explanation
Fig. 1 is a kind of total measure figure of dicode receiver.
In figure: 1, external reception antenna; 01, radio frequency reception demodulator circuit (as superregenerative reception demodulating unit, or beat reception demodulating unit); 02, decoding integrated circuit; 03, the fixed code of decoding integrated circuit; 04, the change code end of decoding integrated circuit; 05, second of decoding integrated circuit export; 06, performance element; 07, first of decoding integrated circuit export; 08, the change decoding circuit of suspension change 1.
Fig. 2 is the practical circuit diagram of this measure relative section.
In figure: 1, external reception antenna; 01, radio frequency reception demodulation part (as superregenerative reception demodulating unit, or beat reception demodulating unit); 02, decoding integrated circuit; 03, the fixed code of decoding integrated circuit; 04, the change code end of decoding integrated circuit; 05, second of decoding integrated circuit export; 06, performance element; 07, first of decoding integrated circuit export; 010, not gate input resistance to earth; 012, not gate; 013, lower inclined resistance; 015, upper inclined resistance; 018, PNP triode.
Fig. 3 is the schematic diagram of external reception antenna and radio frequency reception demodulation part.
In figure: 1, external reception antenna; 2, shielding conductor; 3, the central axis of external reception antenna; 01, radio frequency reception demodulator circuit (as superregenerative reception demodulating unit, or beat reception demodulating unit); 02, decoding integrated circuit.
Embodiment
Fig. 1, Fig. 2, Fig. 3 describe the concrete a kind of mode implemented jointly.
1, element is selected: wherein decoding integrated circuit selects 2272.
2, weld: weld by Fig. 2.
3, external reception antenna is implemented:
(1), with a pole for coil rack, by copper cash on skeleton around on a fixing turn, then pump skeleton.
(2), radio frequency reception demodulator circuit.
(3) or by external reception antenna be welded in outside radio frequency reception demodulator circuit, connect with shielding conductor.
4, Detection and adjustment:
(1), to operating state adjustment and detection: when decoding integrated circuit is not when receiving first signal, the collector electrode universal instrument test of PNP triode is no-voltage, otherwise when the first output of decoding integrated circuit has a high position to export, the current collection very high pressure of PNP triode, otherwise not gate input end grounding resistance should be adjusted.
(2) Function detection, to the integrated automatic changing code bit line of decoding: when launching first time signal, decoding integrated circuit energy reliable reception: when having universal instrument to survey, the first output has high-order output.
(3), the reception connecing twice signal is detected correct: decoding integrated circuit is after receiving the first signal, and secondary signal of fasting ejection very much, at this moment decoding integrated circuit second exports the high position output of oriented rear class.Have voltage to export when having universal instrument to survey this, if when adopting oscilloscope, display screen has high-order reaction.
(4) Received signal strength whether sequential, is detected: the second output universal instrument or oscilloscope being received decoding integrated circuit, if first launch secondary signal, now decoding integrated circuit second exports without high pressure, if there is high pressure, then not gate damages or PNP triode damage.
(5) whether be non-interlocking type: first output and second of universal instrument or oscilloscope being received decoding integrated circuit exports to be observed if, detecting decoding integrated circuit, after receiving signal, within the time of short duration, signal can disappear, otherwise the model of the integrated circuit that should alternate coding.
Claims (5)
1. a dicode receiver, is characterized in that: be jointly made up of the change decoding circuit of radio frequency reception demodulator circuit, external reception antenna, decoding integrated circuit, performance element, suspension change 1:
Wherein: external reception antenna is connected to the input of receiving demodulation circuit, the output of receiving demodulation circuit connects the input of decoding integrated circuit, first of decoding integrated circuit exports the change decoding circuit connecting suspension change 1, and second of decoding integrated circuit exports and connects performance element;
8 bit code positions, 7 live wires connecting ground wire or connection decoding integrated circuit wherein of decoding integrated circuit become fixed code, and another one connects to becoming with the change decoding circuit of suspension change 1 and becomes code end;
The change decoding circuit of suspension change 1 is made up of not gate, PNP triode, bleeder circuit;
First of decoding integrated circuit exports the input connecting not gate, the input of not gate connects a resistance to earth, the output of not gate connects the base stage of PNP triode, bleeder circuit is formed by upper inclined resistance and lower inclined resistance, one end of upper inclined resistance connects power supply, the lower inclined resistance of other end series connection is to ground, and the emitter of PNP triode connects series connection point, and the collector electrode of PNP triode connects change code end.
2. a kind of dicode receiver according to claim 1, is characterized in that: decoding integrated circuit used is non-locking type.
3. a kind of dicode receiver according to claim 1, is characterized in that: the connection of 7 fixed code of decoding integrated circuit should be identical with the connection of the fixed code of integrated circuit of encoding in transmitting.
4. a kind of dicode receiver according to claim 1, is characterized in that: external reception antenna is connected with shielding conductor with between receiving demodulation circuit.
5. a kind of dicode receiver according to claim 1, is characterized in that: external reception antenna is coil antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420514720.5U CN204031141U (en) | 2014-09-09 | 2014-09-09 | A kind of dicode receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420514720.5U CN204031141U (en) | 2014-09-09 | 2014-09-09 | A kind of dicode receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204031141U true CN204031141U (en) | 2014-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420514720.5U Expired - Fee Related CN204031141U (en) | 2014-09-09 | 2014-09-09 | A kind of dicode receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204031141U (en) |
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2014
- 2014-09-09 CN CN201420514720.5U patent/CN204031141U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141217 Termination date: 20150909 |
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| EXPY | Termination of patent right or utility model |