CN204089788U - A kind of single ripple becomes code receiving circuit - Google Patents
A kind of single ripple becomes code receiving circuit Download PDFInfo
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- CN204089788U CN204089788U CN201420511478.6U CN201420511478U CN204089788U CN 204089788 U CN204089788 U CN 204089788U CN 201420511478 U CN201420511478 U CN 201420511478U CN 204089788 U CN204089788 U CN 204089788U
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Abstract
A kind of single ripple becomes code receiving circuit, belong to areas of information technology, it is the circuit launched according to the change code applied for, proposition can be launched with single ripple dicode the one list ripple matched and be become code receiving circuit, realize the reception of floated and " 0 " code twice change code that radiating portion sends, by radio frequency reception demodulation part, the change decoding circuit of " suspension " change " 0 ", performance element, decoding integrated package forms jointly, in an initial condition, the change code end of decoding integrated package is identical with the change code end of launching code block, it is all " suspension " shape, after reliable reception first time transmits, first of decoding integrated package exports and produces high pressure, the change decoding circuit starting " suspension " change " 0 " is formed and becomes code, identical with the variation code " 0 " launched, performance element could be started after receiving second time signal, achieve the change code form of the coding integrated circuit of low price, be conducive to the lifting of the anti-ability of cracking of tri-state coding adhesive integrated circuit.
Description
Technical field
Belong to areas of information technology.
Background technology
The development of modern science makes remote control product get more and more, and as TV, air-conditioning, the locking and unlocking of automobile, remote control product comes into general family at large, but because coding is single, level of confidentiality is inadequate, causes applying in high-grade products, if apply on anti-theft safety door, that anti-theft safety door is just no longer antitheft, perform practically no function, as everyone knows, application remoting technology, first just must encode, 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.Our unit once have developed multiple transmitting Decision Making of Line Schemes that can become code, it can address these problems effectively, if but the receiver do not matched, all become empty talk, therefore, according to existing transmitting Decision Making of Line Schemes, the development of amount body can receive the receiving circuit becoming code, has become the necessary urgent problem solved at present, so, special research can launch with single ripple dicode the receiving circuit mated, and fit in it as a whole, the development for remote control product provides safer guarantee.
Summary of the invention
Main purpose of the present utility model is the circuit launched according to the change code applied for, proposition can be launched with single ripple dicode the one list ripple matched and be become code receiving circuit, realize the reception of floated and " 0 " code twice change code that radiating portion sends, launch for research dicode and create better condition, after enforcement, be conducive to the lifting of the anti-ability of cracking of tri-state coding adhesive integrated circuit, improve the performance of remote control product energetically, make remote control product can obtain using more widely.
The measure that this patent proposes is:
1, a kind of single ripple change code receiving circuit is made up of jointly radio frequency reception demodulation part, the change decoding circuit of " suspension " change " 0 ", performance element, decoding integrated package.
Wherein: the output of radio frequency reception demodulation part connects the input of decoding integrated package, first of decoding integrated package exports the change decoding circuit connecting " suspension " change " 0 ", and second of decoding integrated package exports and connects performance element.
Wherein 7 connections of decoding integrated package 8 bit code position are fixed code, and another one becomes and becomes code end.
The change decoding circuit of " suspension " change " 0 " is made up of analog switch and triode: the control end of analog switch connects first of integrated package of decoding and exports, to the base stage of triode after output termination resistance of analog switch, together with the transmitting of triode terminates at the change code of decoding integrated package, the collector electrode of triode connect another resistance to.
2, integrated package of decoding is non-locking type.
3, the connected mode of the fixed code of decoding integrated package should be the same with the fixed code connected mode of integrated package of encoding in corresponding transmitting.
4, triode is PNP triode.
5, the input of analog switch is connected together with the ground terminal of decoding integrated package.
6, two resistance are all small-power resistance.
This measure is explained as follows further:
1, sketch the cardinal principle of single ripple dicode transmitting that our unit for the previous period develops: in 8 bit codes of coding integrated package, wherein 7 is fixed code, wherein one is variation code, and radiating portion, when launching, launch two subcategory numbers.Wherein transmitter code is 7 fixed code wherein for the first time, and first subcategory number of " variation " code of one, and the code that second time is launched is 7 constant fixed code, and the coded signal after one " variation code " variation.And the first time coded signal of the receiving unit that the present invention the matches integrated middle variation that is received code is " suspension ", second time signal is the situation of " 0 ".And present receiving lines of the present invention, reliably will can receive the variation code sent for the first time is exactly " suspension ", and second time signal is the signal of the situation of " 0 ", but current scheme is different from the patent formula applied for last time.
2, in this measure 1, the line construction of the decode in two phases of generation: with 8 bit code lines in decoding integrated package and radiating portion integrated package of encoding corresponding.7 bit codes have wherein connected into fixed code (11 in Fig. 2).Last bit code becomes the change code end (10 in Fig. 2) of a kind of reception twice signal, and when initial condition, the code bit that in receiving unit, " displacement code " position presents all the time is the stationary state of " suspension ", and after receiving signal just produce decoding in change code become " 0 " state.Its decoding is integrated with two outputs, wherein first output (4 in Fig. 2), is also called to be " suspension " the change decoding circuit control end of change " 0 ", this end directly controls to become code.Another one is second output (6 in Fig. 2), and this output is connected with rear class, is directly to export decoded result at the corresponding levels.The structure of this circuit can realize receiving the requirement becoming code.In above-mentioned line construction, first of decoding integrated package exports the control end of connecting analog switch, the input end grounding line of analog switch, the output of analog switch connects the base stage to triode after a resistance, the collector electrode of triode connects another resistance to ground wire, the code bit be connected with the emitter of triode is and becomes code end, namely changes code.
3, the change decoding circuit of " suspension " change " 0 " realizes " suspensions " code and becomes the reason of " 0 " code and be: when decode integrated first output no-output into zero time, the control end of the analog switch connected is low level, switch is off state, PNP triode base stage is without bias current, its collector electrode no-output, the change code end connected both did not connect power supply and ground wire, was " suspension " shape.Otherwise export as time high when integrated first output of decoding has, the control end of the analog switch connected is for high-order, switch is on-state, there is bias current in PNP triode base stage, emitter and collector electrode conducting, the change code terminate ground wire connected is low level, so achieve the transformation that " suspension " becomes " 0 ".
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 Fig. 2, in an initial condition, namely, when first of integrated package of decoding exports Non voltage output, the control end of the analog switch connected is low level, and switch is off state, PNP triode base stage is without bias current, its collector electrode no-output, the change code end connected both did not connect power supply and ground wire, was " suspension " shape, be that suspended phase is corresponding with the first time signal sent, so first signal that radiating portion sends can be received.
(2), receive the second subcategory number of sending of radiating portion principle: after receiving the first signal sent, at this moment the first output of integrated circuit of encoding has the high signal of 1 to input,, the control end of the analog switch connected is for high-order, and switch is on-state, there is bias current in PNP triode base stage, emitter and collector electrode conducting, the change code terminate ground wire connected is low level, i.e. " 0 " state, identical with the variation code " 0 " launched, so can secondary coded signal be received.
(3), receive the sequential that has that twice change code must have successively to limit and principle: because the initial shape of decoding integrated package flexure curve in the present invention is suspension, so when only having radiating portion to send variation code for suspending, launching and receiving code could be corresponding, the output of coding integrated package first just has output, thus decoding integrated package is caused to become the new code that code just has " 0 ", and this new code could coincide with transmitting, thus integrated second output that makes to decode in the present invention has high-order output.Otherwise radiating portion is if first launching is secondary " 0 " signal, now because the change code bit line of coding integrated package of the present invention is that " suspension " shape and transmitter code do not meet under initial condition, do not have the output be connected with rear class.More than analyze, the present invention's decoding is integrated with output, after must first receiving primary correct signal, just may receive the correct signal that second time is launched.
(4), twice emitting signal has the strict demand receiving the time limit, (its benefit greatly can improve the ability of cracking) and principle: the transient state output type decoding integrated package that its decoding integrated package adopts in this measure, its benefit is, decoding integrated package is after receiving the signal sent for the first time, and the first output has high-order output, but is 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 important elements.Thus the level of confidentiality cracked is greatly increased.
5, the electronic switch used in measure 1 is analog switch CD4066, there are 4 independently analog switches inside, the crosstalk of each switch room is very little, representative value is-50dB, when control end adds high level, switch conduction, conduction impedance is lower, in addition, conduction impedance is substantially constant in whole input reference signal.Eliminate the change of switching transistor threshold voltage with input signal, therefore within the scope of whole working signal, conduction impedance is lower.Compared with single channel switch, there is input signal peak voltage ranges and equal supply voltage and the advantage such as conduction impedance is more stable in input reference signal.The switch cut-off when control end adds low level.During analog switch conducting, conducting resistance is tens ohm; During analog switch cut-off, present very high impedance, can open circuit be become.Analog switch can transmission of digital signals and analog signal, and the upper limiting frequency of the analog signal that can transmit is 40MHz.
Analog switch is a kind of three-stable state circuit, and it according to the level of control end, can determine the state of input end and output.When control end is in strobe state, the state of output depends on the state of input end; When control end is in cut-off state, then no matter input end's level how, output is all high-impedance state.Analog switch possess low in energy consumption, speed fast, mechanical contact, volume are little and the feature such as long service life.
After the invention process, after coordinating with the radiating portion applied for before our unit, below outstanding feature:
1, the reception of floated and " 0 " code twice change code that radiating portion sends is realized, achieve the change code form of the coding integrated circuit of low price, be conducive to the lifting of the anti-ability of cracking of tri-state coding adhesive integrated circuit, just output is had after must receiving two subcategory numbers after the receiving circuit decoding of present inventor, thus there is the very high anti-ability of cracking, because rudimentary coding integrated package has cheap advantage, so its product has very strong competitiveness.
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 package 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 " 0 ", 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 " 0 ".Have followed the rule of this kind of encoding and decoding integrated package 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 " 0 " 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 meaning 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, this crack probability just may be lower.
5, circuit is reliable, and one is that circuit is simplified.Two be analog switch possess low in energy consumption, speed fast, mechanical contact, volume are little and the feature such as long service life.
6, 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 total measure schematic diagram that a kind of single ripple becomes code receiving circuit.
In figure: 1, radio frequency reception demodulation part (as superregenerative reception demodulating unit, or beat reception demodulating unit); 2, decoding integrated package; 3, performance element; 4, integrated package first of decoding exports; 5, the change decoding circuit of " suspension " change " 0 "; 6, integrated package second of decoding exports.
Fig. 2 is the practical circuit diagram of this measure relative section.
In figure: 1, radio frequency reception demodulation part (as superregenerative reception demodulating unit, or beat reception demodulating unit); 2, decoding integrated package; 3, performance element; 4, integrated package first of decoding exports; What integrated package of 6, decoding was connected with rear class second exports; 9, analog switch; 10, PNP triode base resistance; 11, analog switch input; 12, PNP triode grounded collector resistance; 15, PNP triode; 17, the change code end of decoding integrated package; 18, the fixed code of decoding integrated package.
Embodiment
Fig. 1 and Fig. 2 describes the concrete a kind of mode implemented jointly.
1, element is selected: integrated package of wherein decoding selects 2272, and analog switch is CD4066, and triode is low power PNP triode, and resistance is the small-power resistance of 1/4 watt.
2, weld: weld by Fig. 2.
3, adjustment and detection:
(1), can the Function detection of automatic changing code bit line: when launching first time signal, energy reliable reception of the present invention: the first output having universal instrument to survey decoding integrated package has high-order output.
(2), twice signal receiving function detects: after receiving the first signal, secondary signal of fasting ejection very much, integrated package second of at this moment decoding exports high-order output.Have voltage to export when having universal instrument to survey this, if when adopting oscilloscope, display screen has high-order reaction.
(3) Received signal strength whether sequential, is detected: the second output universal instrument or oscilloscope being received decoding integrated package, if first launch secondary signal, integrated package second of now decoding exports without high pressure, if there is high pressure, the damage of the base resistance of PNP triode excessive or analog switch is described.
(4), detect whether decoding integrated package is non-interlocking type: first output and second of universal instrument or oscilloscope being received decoding integrated package exports to be observed, and after receiving signal, signal can disappear within the time of short duration, otherwise should change the model of decoding integrated package.
Claims (6)
1. single ripple becomes a code receiving circuit, it is characterized in that: be jointly made up of radio frequency reception demodulation part, the change decoding circuit of " suspension " change " 0 ", performance element, decoding integrated package;
Wherein: the output of radio frequency reception demodulation part connects the input of decoding integrated package, first of decoding integrated package exports the change decoding circuit connecting " suspension " change " 0 ", and second of decoding integrated package exports and connects performance element;
Wherein 7 connections of decoding integrated package 8 bit code position are fixed code, and another one becomes and becomes code end;
The change decoding circuit of " suspension " change " 0 " is made up of analog switch and triode: the control end of analog switch connects first of integrated package of decoding and exports, to the base stage of triode after output termination resistance of analog switch, together with the transmitting of triode terminates at the change code of decoding integrated package, the collector electrode of triode connect another resistance to.
2. the single ripple of one according to claim 1 becomes code receiving circuit, it is characterized in that: decoding integrated package is non-locking type.
3. the single ripple of one according to claim 1 becomes code receiving circuit, it is characterized in that: the connected mode of the fixed code of decoding integrated package should be the same with the fixed code connected mode of integrated package of encoding in corresponding transmitting.
4. the single ripple of one according to claim 1 becomes code receiving circuit, it is characterized in that: triode is PNP triode.
5. the single ripple of one according to claim 1 becomes code receiving circuit, it is characterized in that: the input of analog switch is connected together with the ground terminal of decoding integrated package.
6. the single ripple of one according to claim 1 becomes code receiving circuit, it is characterized in that: two resistance are all small-power resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420511478.6U CN204089788U (en) | 2014-09-08 | 2014-09-08 | A kind of single ripple becomes code receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420511478.6U CN204089788U (en) | 2014-09-08 | 2014-09-08 | A kind of single ripple becomes code receiving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204089788U true CN204089788U (en) | 2015-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420511478.6U Expired - Fee Related CN204089788U (en) | 2014-09-08 | 2014-09-08 | A kind of single ripple becomes code receiving circuit |
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|---|---|
| CN (1) | CN204089788U (en) |
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- 2014-09-08 CN CN201420511478.6U patent/CN204089788U/en not_active Expired - Fee Related
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| 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: 20150107 Termination date: 20160908 |
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| CF01 | Termination of patent right due to non-payment of annual fee |