CN201369794Y - Wireless reverse backsight system - Google Patents
Wireless reverse backsight system Download PDFInfo
- Publication number
- CN201369794Y CN201369794Y CNU2009203010160U CN200920301016U CN201369794Y CN 201369794 Y CN201369794 Y CN 201369794Y CN U2009203010160 U CNU2009203010160 U CN U2009203010160U CN 200920301016 U CN200920301016 U CN 200920301016U CN 201369794 Y CN201369794 Y CN 201369794Y
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Abstract
The utility model relates to a wireless reverse backsight system, which comprises a camera for collecting reverse video frequency information, an emitter circuit for sending reverse video frequency information, a receiving circuit for receiving reverse video frequency information and a display for displaying reverse video frequency information, wherein the camera is connected with the emitter circuit, the emitter circuit is wirelessly connected with the receiving circuit, and the receiving circuit is connected with the display. The wireless reverse backsight system further comprises a mark generation circuit and a checking circuit, wherein the mark generation circuit is connected with the emitter circuit, the checking circuit is connected with the receiving circuit, the emitter circuit sends reverse video frequency information and locomotive car status mark information generated by the mark generation circuit to the receiving circuit after modulating, the checking circuit judges whether the display is permitted to display the received reverse video frequency information according to the locomotive car status mark information demodulated by the receiving circuit. The wireless reverse backsight system can avoid the disturbance of reverse video frequency information of an adjacent vehicle when driven backward.
Description
Technical field
The utility model relates to motor vehicle fittings, relates in particular to a kind of wireless vehicle backing backsight system.
Background technology
Along with the raising of people's living standard, motor vehicle has entered a lot of ordinary citizens' life, and simultaneously relevant with motor vehicle such as automobile a lot of electronic products also arise at the historic moment.The vehicle backing backsight system is exactly wherein a kind of.Vehicle backing backsight system in the market is divided into two kinds of wireless vehicle backing backsight system and wired vehicle backing backsight systems, because easy for installation, wireless vehicle backing backsight system is more more extensive than the application of wired vehicle backing backsight system.But there is such problem in wireless vehicle backing backsight system in application: when two cars at a distance of nearer, and the mutual interference of video information phase might occur moveing backward when using same channel reversing, the reversing video information that is the first car appears on the display screen of second car, the reversing video information of second car appears on the display screen of first car, may result in an automobile accident thus or the generation of accident.
The utility model content
Technical problem to be solved in the utility model provides a kind of wireless vehicle backing backsight system, avoids being subjected in reversing the interference of the reversing video information of adjacent vehicle.
For solving the problems of the technologies described above, the utility model proposes a kind of wireless vehicle backing backsight system, comprise the camera of gathering the reversing video information, send the radiating circuit of described reversing video information, the display that receives the receiving circuit of described reversing video information and show described reversing video information, described camera links to each other with described radiating circuit, described radiating circuit links to each other with described receiving circuit with wireless mode, described receiving circuit links to each other with described display, also comprise sign generative circuit and checking circuit, described sign generative circuit links to each other with described radiating circuit, described checking circuit links to each other with described receiving circuit, send to described receiving circuit after the motor vehicle identity identification information modulation of described radiating circuit with described reversing video information and the generation of described sign generative circuit, whether the described motor vehicle identity identification information judgment that described checking circuit demodulates according to described receiving circuit allows described display that the reversing video information that receives is shown.
Further, said system also can have following characteristics, and described sign generative circuit is composed in series by first single-chip microcomputer and oscillator, preserves default motor vehicle identity identification information in described first single-chip microcomputer.
Further, said system also can have following characteristics, and described checking circuit is made up of shaping circuit and second singlechip, preserves default motor vehicle identity identification information in the described second singlechip.
Further, said system also can have following characteristics, described radiating circuit comprises crystal, Phase Lock Loop IC, loop filter, radio-frequency oscillator, power amplifier, filter and the transmitting antenna of series connection successively, and the video processing circuits that links to each other with described radio-frequency oscillator, the control end of described power amplifier is connected to described Phase Lock Loop IC.
Further, said system also can have following characteristics, and described receiving circuit comprises reception antenna, low noise amplifier, filter and the FM demodulation chip of series connection successively.
Wireless vehicle backing backsight of the present utility model system is in the process of reversing, can judge whether the reversing video information that is received belongs to this car by machines motor-car identification information, thereby can effectively stop the reversing picture of other vehicle to enter in the display of this car, avoid in reversing, being subjected to the interference of the reversing video information of adjacent vehicle.
Description of drawings
Fig. 1 is the structure chart of the wireless vehicle backing backsight of the utility model system;
Fig. 2 is the realization schematic diagram of the wireless vehicle backing backsight of the utility model system radiating portion;
Fig. 3 is the realization schematic diagram of the wireless vehicle backing backsight of the utility model system receiving unit;
Fig. 4 is a kind of structure chart of id information code data bag.
Former 6M oscillator among Fig. 2 changes beat frequency oscillator into, and the frequency information in other accompanying drawings is also deleted, please examine.
Embodiment
Below in conjunction with drawings and Examples the technical solution of the utility model is further described.
Fig. 1 is the structure chart of the wireless vehicle backing backsight of the utility model system.As shown in Figure 1, the wireless vehicle backing backsight of the utility model system comprises camera 1, sign generative circuit 2, radiating circuit 3, receiving circuit 4, testing circuit 5 and display 6.Wherein, camera 1 links to each other with radiating circuit 3, and radiating circuit 3 links to each other with receiving circuit 4 with wireless mode, and receiving circuit 5 links to each other with display 6, and sign generative circuit 2 links to each other with radiating circuit 3, and checking circuit 5 links to each other with receiving circuit 4.Wherein, camera 1 is used for gathering the reversing video information at reversing process.Sign generative circuit 2 is used to generate the motor vehicle identity identification information, and this identification information can come this motor vehicle and the difference of other motor vehicles.Radiating circuit 3 is used for motor vehicle identity identification information that reversing video information that camera 1 is collected and sign generative circuit 2 generated and modulates the back together and send with wireless.Radiating circuit 3 and receiving circuit 4 are connected with wireless mode.Receiving circuit 4 receives the information that radiating circuit 3 sends, and video information and motor vehicle identity identification information obtain after the demodulation moveing backward.Receiving circuit 4 also is divided into the information that obtains after the demodulation that two-way sends testing circuit 5 respectively to and display 6, a tunnel is the motor vehicle identity identification information, sends testing circuit 5 to, and another road is the reversing video information, sends display 5 to.Whether testing circuit 5 is used for allowing described display that the reversing video information that receives is shown according to the motor vehicle identity identification information judgment that gets access to from receiving circuit 4.Preserve and identify the consistent detection information of motor vehicle identity identification information of generative circuit 2 generations in the testing circuit 5, the motor vehicle identity identification information that gets access to from receiving circuit 4 when the testing circuit 5 and checking information of self preserving is inconsistent or when receiving circuit 4 obtains less than motor vehicle identity identification information (video information of promptly moveing backward is not followed the motor vehicle identity identification information of its synchronous driving), illustrate that reversing video information that receiving circuit 4 is demodulated is not this car, but from the interference signal of other cars, testing circuit 5 sends to 4 one control signals of receiving circuit, close the video-out port of receiving circuit 4, the port of i.e. output reversing video information, display 6 does not just show any reversing picture; When the motor vehicle identity identification information that gets access to from receiving circuit 4 when testing circuit 5 is consistent with the checking information of self preserving, illustrate that the reversing video information that receiving circuit 4 is demodulated is this car, testing circuit 5 does not transmit control signal to receiving circuit 4, and the reversing video information that allows 6 pairs of receiving circuits 4 of display to receive and demodulate shows.Display 6 is used for the reversing video information that belongs to this car is shown, promptly shows the reversing picture of this car.
Wherein, the radiating circuit of wireless vehicle backing backsight system can comprise crystal, Phase Lock Loop IC, loop filter, radio-frequency oscillator, power amplifier, filter and the transmitting antenna of series connection successively, and the video processing circuits that links to each other with the 2.4G oscillator, the control end of its intermediate power amplifier is connected to Phase Lock Loop IC.
Wherein, receiving circuit can comprise reception antenna, low noise amplifier, filter and the FM demodulation chip of series connection successively.
The operation principle of vehicle backing backsight system that the utility model is wireless is as follows: radiating circuit 3 is modulated to the reversing video information that camera 1 is gathered on the carrier wave of one setpoint frequency (such as 2.4GHz) on the one hand, to identify the motor vehicle identity identification information that generative circuit 2 generated (such as one group of id information sign indicating number that is used to distinguish each car setting) on the other hand and be modulated to another setpoint frequency (such as 2.4G ± Δ f (general Δ f equal'ss 6M or 6.5M audio frequency)) carrier wave, two parts of signals sends with the radio signal form through radiating circuit 3.Receiving circuit 4 carries out demodulation to this signal after receiving the signal of radiating circuit 3 transmissions, obtains two paths of signals-reversing video information and motor vehicle identity identification information.Receiving circuit 4 sends the motor vehicle identity identification information that demodulates to testing circuit 5, testing circuit 5 is compared this identification information with the checking information of self preserving, if unanimity or testing circuit 5 do not get access to identification information from receiving circuit 4, then do not transmit control signal to receiving circuit 4, receiving circuit 4 will be given display 6 by video-out port output reversing video information this moment, 6 pairs of reversings of display picture shows, then transmit control signal as if inconsistent to receiving circuit 4, close the video-out port of receiving circuit 4, just do not show any reversing picture on the display 6.Like this in the process of reversing, the reversing picture of other vehicle just can not enter in the display of this car, because in case testing circuit 5 detects less than identification information or identification information mistake, it all can close video, therefore can effectively avoid being subjected in reversing the interference of adjacent vehicle backing backsight.
Usually, Acquisition Circuit 1, sign generative circuit 2 and transtation mission circuit 3 are collectively referred to as the radiating portion of wireless vehicle backing backsight system, are positioned at tailstock portion, and receiving circuit 4, testing circuit 5 and display 6 are collectively referred to as the receiving unit of wireless vehicle backing backsight system, are positioned at car.
Fig. 2 is the realization schematic diagram of wireless vehicle backing backsight system radiating portion.As shown in Figure 2, be connected to the first input end of radio-frequency oscillator (is 2.4G such as frequency) after camera and the video processing circuits series connection, also be connected to the first input end of radio-frequency oscillator after first single-chip microcomputer and the beat frequency oscillator series connection, crystal, be connected to second input of radio-frequency oscillator after Phase Lock Loop IC and loop filter are in sequential series, Phase Lock Loop IC also links to each other with the feedback output end of single-chip microcomputer and radio-frequency oscillator respectively, and the output of radio-frequency oscillator is connected to power amplifier, the input of the series circuit of filter and transmitting antenna composition in sequential series (being the input of power amplifier).
The operation principle of the realization schematic diagram of wireless vehicle backing backsight shown in Figure 2 system radiating portion is as follows: single-chip microcomputer produces the ID (Identity as the motor vehicle identity identification information, identify label) information code at first is modulated on 6M or the frequency of oscillation, the reversing vision signal that produces with camera is added to together and carries out FM (Frequency Modulation on the radio-frequency oscillator then, frequency modulation) modulation, the signal after the modulation is exactly the radiofrequency signal that has video and id information sign indicating number information.This signal is just launched from antenna by amplifying the back subsequently.Setting by external switch in addition to make tranmitting frequency switch at four channels.
Among Fig. 2, the series circuit that first single-chip microcomputer and beat frequency oscillator (frequency can be set as required, such as 6M) are formed is used for realizing the function of sign generative circuit 2 among Fig. 1.The following describes the generative process that is used as the id information sign indicating number of motor vehicle identity identification information: at first in first Single Chip Microcomputer (SCM) program of radiating portion, set the id information code data bag (i.e. the identification information of preserving this car in first single-chip microcomputer) of wanting burning, after radiating portion powers on, advanced row of channels control operation after the program initialization of first single-chip microcomputer is finished, lock user-selected frequency, generate each byte odd check code of channel control code and packet simultaneously by software, after more than finishing, being provided with and sending id information sign indicating number sign position is 1, then complete id information sign indicating number is delivered to the part that the 2.4G oscillator modulates becomes to transmit.
Fig. 4 has provided a kind of structure of id information code data bag.As shown in Figure 4, this id information code data packet format is as follows:
{ [(lead code)+(sync bit)]+[(three byte data territories)+(a byte control domain)]+(stop bits) }
Wherein, lead code is that 8 lead codes adopt periodic square wave to transmit, square wave parameter F h=1.8Khz, and Th=280us, the function of lead code is that to finish sync bit undistorted;
Sync bit is to finish valid data synchronous base point, parameter: Fi=400Hz, RiseTime=1.8ms, Fall Time=500us are provided in asynchronous transmission;
Data field is the id information sign indicating number information that sends, and comprises 3 bytes (24 Bit data), and amounting to (2N24=16777216) group id information sign indicating number can use;
Control domain is 1 byte data, be used for the parity check code of transfer channel information and date, high 4 transfer channel information, the 1st is the odd parity bit of the 1st byte in the information field in low 4, the 2nd is the odd parity bit of the 2nd byte in the information field, the 3rd is the odd parity bit of the 3rd byte in the information field, and the 4th is the control domain odd parity bit;
Stop bits is used for representing that data send end, continues 1ms with low level and finishes.
Certainly, id information code data bag also can adopt other structure, and we have just provided a kind of example structure of id information code data bag herein.
Fig. 3 is the realization schematic diagram of wireless vehicle backing backsight system receiving unit.As shown in Figure 3, be connected to the input of FM demodulation chip (frequency of FM demodulation chip is consistent with the frequency of aforementioned radio-frequency oscillator) after reception antenna, low noise amplifier and filter are in sequential series here, first output of FM demodulation chip is connected to the input of the series circuit that shaping circuit and second singlechip be in series, the output of this series circuit is connected to the control end of 2.4GFM demodulation chip, and second output of FM demodulation chip is connected to display.
The operation principle of the realization schematic diagram of wireless vehicle backing backsight shown in Figure 3 system receiving unit is as follows: the radiofrequency signal that has video and id information sign indicating number information that receives from reception antenna amplify by low noise and filtering after, give FM demodulation chip.Export two paths of signals after process frequency reducing and the demodulation in the FM demodulation chip: the one tunnel is vision signal, and one the tunnel is the id information sign indicating number of reduction.Vision signal is given display, and the id information sign indicating number is given second singlechip through shaping circuit, whether what solidify in the id information sign indicating number that second singlechip contrast receives and its program is yard consistent, if inconsistent explanation receives garbage, second singlechip is given control signal of FM demodulation chip, turn-offs its video output (being second output of FM demodulation chip).Have only constantly to receive correct id information sign indicating number, just the video of moveing backward can occur on the indicator screen.
Among Fig. 3, the series circuit that shaping circuit and second singlechip are formed is used for realizing the function of testing circuit 5 among Fig. 1.The following describes and utilize the id information sign indicating number to make the process that detects: after the FM demodulation chip demodulates the code signal of id information sign indicating number, earlier waveform is carried out shaping through shaping circuit, return to the data packet format in the radiating portion, be sent to the I/O mouth of second singlechip again, after having detected the coding input, second singlechip begins to detect sync bit, beginning synchronous receiving data bag is also decoded after detecting sync bit, to finish to receive packet after detecting the ED position, also preserve id information sign indicating number (being the identification information of also preserving this car in the second singlechip) in the second singlechip, whether the id information sign indicating number that receives 3 bytes in the more received packet of the packet id information sign indicating number that the second singlechip basis oneself is preserved after verification is correct is correct, after correct, begin to confirm whether control code is correct, just open the video clamp circuit in the FM demodulation chip after all correct, allow outputting video signal.
Wireless vehicle backing backsight of the present utility model system is in the process of reversing, can judge whether the reversing video information that is received belongs to this car by machines motor-car identification information, thereby can effectively stop the reversing picture of other vehicle to enter in the display of this car, avoid in reversing, being subjected to the interference of the reversing video information of adjacent vehicle.
The above only is preferred embodiment of the present utility model, and is in order to restriction the utility model, not all within spirit of the present utility model and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (5)
1. wireless vehicle backing backsight system, comprise the camera of gathering the reversing video information, send the radiating circuit of described reversing video information, the display that receives the receiving circuit of described reversing video information and show described reversing video information, described camera links to each other with described radiating circuit, described radiating circuit links to each other with described receiving circuit with wireless mode, described receiving circuit links to each other with described display, it is characterized in that, also comprise sign generative circuit and checking circuit, described sign generative circuit links to each other with described radiating circuit, described checking circuit links to each other with described receiving circuit, send to described receiving circuit after the motor vehicle identity identification information modulation of described radiating circuit with described reversing video information and the generation of described sign generative circuit, whether the described motor vehicle identity identification information judgment that described checking circuit demodulates according to described receiving circuit allows described display that the reversing video information that receives is shown.
2. wireless vehicle backing backsight according to claim 1 system is characterized in that described sign generative circuit is composed in series by first single-chip microcomputer and oscillator, preserves default motor vehicle identity identification information in described first single-chip microcomputer.
3. wireless vehicle backing backsight according to claim 2 system is characterized in that described checking circuit is made up of shaping circuit and second singlechip, preserves default motor vehicle identity identification information in the described second singlechip.
4. wireless vehicle backing backsight according to claim 1 system, it is characterized in that, described radiating circuit comprises crystal, Phase Lock Loop IC, loop filter, radio-frequency oscillator, power amplifier, filter and the transmitting antenna of series connection successively, and the video processing circuits that links to each other with described radio-frequency oscillator, the control end of described power amplifier is connected to described Phase Lock Loop IC.
5. wireless vehicle backing backsight according to claim 1 system is characterized in that described receiving circuit comprises reception antenna, low noise amplifier, filter and the FM demodulation chip of series connection successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009203010160U CN201369794Y (en) | 2009-03-03 | 2009-03-03 | Wireless reverse backsight system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009203010160U CN201369794Y (en) | 2009-03-03 | 2009-03-03 | Wireless reverse backsight system |
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| Publication Number | Publication Date |
|---|---|
| CN201369794Y true CN201369794Y (en) | 2009-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009203010160U Expired - Fee Related CN201369794Y (en) | 2009-03-03 | 2009-03-03 | Wireless reverse backsight system |
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| CN (1) | CN201369794Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188480A (en) * | 2011-12-30 | 2013-07-03 | 上海博泰悦臻电子设备制造有限公司 | Car backing display system and car backing display method |
| CN105510651A (en) * | 2015-11-25 | 2016-04-20 | 惠州市德赛西威汽车电子股份有限公司 | Pulse generator and reversal test system |
-
2009
- 2009-03-03 CN CNU2009203010160U patent/CN201369794Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188480A (en) * | 2011-12-30 | 2013-07-03 | 上海博泰悦臻电子设备制造有限公司 | Car backing display system and car backing display method |
| CN103188480B (en) * | 2011-12-30 | 2018-03-06 | 上海博泰悦臻电子设备制造有限公司 | Display system of moving backward and reversing display methods |
| CN105510651A (en) * | 2015-11-25 | 2016-04-20 | 惠州市德赛西威汽车电子股份有限公司 | Pulse generator and reversal test system |
| CN105510651B (en) * | 2015-11-25 | 2019-02-01 | 惠州市德赛西威汽车电子股份有限公司 | Impulse generator and reversing test macro |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091223 Termination date: 20180303 |