Coaxial cable with bidirectional data transmission
A vision system for a vehicle includes a camera and a control. The camera is disposed at a vehicle and has a field of view exterior of the vehicle. The camera is operable to capture image data. The control includes an image processor. A single coaxial cable connects the camera with the control. The single coaxial cable carries (i) image data from the camera to the control, (ii) control data from the control to the camera and (iii) electrical voltage for powering the camera. The image processor is operable to process image data captured by the camera and carried to the control by the single coaxial cable. The single coaxial cable carries at least one FBAS signal.
1. A vision system for a vehicle, said vision system comprising:
a camera disposed at a vehicle equipped with said vision system, wherein said camera, when disposed at the vehicle, has a field of view exterior of the vehicle, said camera capturing image data;
a control comprising an image processor;
a single coaxial cable connecting said camera with said control;
wherein said single coaxial cable comprises a single core wire, an inner shielding layer and an outer shielding layer;
wherein said inner shielding layer circumscribes said single core wire and said outer shielding layer circumscribes said inner shielding layer, and wherein said outer shielding layer is electrically isolated from said inner shielding layer and said inner shielding layer is electrically isolated from said single core wire;
wherein said single coaxial cable carries (i) image data from said camera to said control, (ii) camera control data from said control to said camera and (iii) electrical voltage for powering said camera;
wherein said image processor is operable to process image data captured by said camera and carried to said control via said single coaxial cable;
wherein electrical voltage for powering said camera is carried by said inner and outer shielding layers, and wherein one of said inner and outer shielding layers is electrically connected to negative voltage or ground and the other of said inner and outer shielding layers is electrically connected to positive voltage;
wherein said control receiving image data carried thereto via said single coaxial cable comprises a phase lock loop locking to a signal carrier frequency carried by said single coaxial cable; and
wherein said camera is part of a plurality of cameras, and wherein respective coaxial cables connect said cameras with said control, and wherein said plurality of cameras and said control are part of a multi-camera surround view vision system of the vehicle.
2. The vision system of claim 1 , wherein said vision system is operable to carry camera control data via modulation of a carrier wave of at least one analog signal on said single coaxial cable.
3. The vision system of claim 2 , wherein said carrier wave has a frequency that is outside the bandwidth of signals carrying image data.
4. The vision system of claim 1 , wherein said electrical voltage comprises a direct current electrical voltage.
5. The vision system of claim 1 , wherein said electrical voltage comprises an alternating current electrical voltage.
6. The vision system of claim 1 , wherein camera control data is carried on said single coaxial cable by a signal having a frequency outside of the bandwidth of signals carrying image data on said single coaxial cable.
7. The vision system of claim 6 , wherein camera control data carried on said single coaxial cable has a frequency that has a sufficient Shannon distance from a frequency of signals carrying image data on said single coaxial cable.
8. The vision system of claim 1 , wherein said single coaxial cable carries calibration and response data from said camera to said control.
9. The vision system of claim 1 , wherein camera control data carried on said single coaxial cable from said control to said camera comprises initialization data.
10. A vision system for a vehicle, said vision system comprising:
a plurality of cameras disposed at a vehicle equipped with said vision system, wherein each of said cameras, when disposed at the vehicle, has a respective field of view exterior of the vehicle, said cameras capturing image data;
a control comprising an image processor;
wherein said plurality of cameras and said control are part of a multi-camera surround view vision system of the vehicle;
a plurality of coaxial cables, each connecting a respective one of said cameras with said control;
wherein each of said coaxial cables comprises a single core wire, an inner shielding layer and an outer shielding layer;
wherein said inner shielding layer circumscribes said single core wire and said outer shielding layer circumscribes said inner shielding layer, and wherein said outer shielding layer is electrically isolated from said inner shielding layer and said inner shielding layer is electrically isolated from said single core wire;
wherein each of said coaxial cables carries (i) image data from the respective camera to said control, (ii) camera control data from said control to the respective camera and (iii) electrical voltage for powering the respective camera;
wherein said image processor is operable to process image data captured by said cameras and carried to said control via said coaxial cables;
wherein electrical voltage for powering each of said cameras is carried by said inner and outer shielding layers of a respective one of said coaxial cables, and wherein one of said inner and outer shielding layers of the respective coaxial cable is electrically connected to negative voltage or ground and the other of said inner and outer shielding layers of the respective coaxial cable is electrically connected to positive voltage; and
wherein said control receiving image data carried thereto via said coaxial cables comprises a phase lock loop locking to a signal carrier frequency carried by at least some of said coaxial cables.
11. The vision system of claim 10 , wherein said vision system is operable to carry camera control data via modulation of a carrier wave of at least one analog signal.
12. The vision system of claim 11 , wherein said carrier wave has a frequency that is outside the bandwidth of signals carrying image data on a respective one of said coaxial cables.
13. The vision system of claim 10 , wherein said electrical voltage comprises a direct current electrical voltage.
14. The vision system of claim 10 , wherein said electrical voltage comprises an alternating current electrical voltage.
15. The vision system of claim 10 , wherein camera control data is carried by a signal having a frequency outside of the bandwidth of signals carrying image data on a respective one of said coaxial cables.
16. A vision system for a vehicle, said vision system comprising:
a plurality of cameras disposed at a vehicle equipped with said vision system, wherein each of said cameras, when disposed at the vehicle, has a respective field of view exterior of the vehicle, said cameras capturing image data;
a control comprising an image processor;
wherein said plurality of cameras and said control are part of a multi-camera surround view vision system of the vehicle;
a plurality of coaxial cables, each connecting a respective one of said cameras with said control;
wherein at least some of said coaxial cables comprise a single core wire, an inner shielding layer and an outer shielding layer;
wherein said inner shielding layer circumscribes said single core wire and said outer shielding layer circumscribes said inner shielding layer, and wherein said outer shielding layer is electrically isolated from said inner shielding layer and said inner shielding layer is electrically isolated from said single core wire;
wherein said at least some of said coaxial cables carry (i) image data from the respective camera to said control, (ii) camera control data from said control to the respective camera and (iii) electrical voltage for powering the respective camera;
wherein camera control data is carried by a signal having a frequency outside of the bandwidth of signals carrying image data on a respective one of said at least some of said coaxial cables;
wherein said image processor is operable to process image data captured by said cameras;
wherein electrical voltage for powering a respective one of said cameras is carried by said inner and outer shielding layers of a respective one of said at least some of said coaxial cables, and wherein one of said inner and outer shielding layers of the respective coaxial cable is electrically connected to negative voltage or ground and the other of said inner and outer shielding layers of the respective coaxial cable is electrically connected to positive voltage; and
wherein said control receiving image data carried thereto via said coaxial cables comprises a phase lock loop locking to a signal carrier frequency carried by at least some of said coaxial cables.
17. The vision system of claim 16 , wherein said vision system is operable to carry camera control data via modulation of a carrier wave of at least one analog signal, and wherein said carrier wave has a frequency that is outside the bandwidth of signals carrying image data on a respective one of said at least some of said coaxial cables.
18. The vision system of claim 16 , wherein said electrical voltage comprises an alternating current electrical voltage.