CN111770248A - Analog video signal water ripple suppression circuit and panoramic parking system - Google Patents
Analog video signal water ripple suppression circuit and panoramic parking system Download PDFInfo
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- CN111770248A CN111770248A CN202010585363.1A CN202010585363A CN111770248A CN 111770248 A CN111770248 A CN 111770248A CN 202010585363 A CN202010585363 A CN 202010585363A CN 111770248 A CN111770248 A CN 111770248A
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- power supply
- parking system
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 230000001629 suppression Effects 0.000 title claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims description 59
- 238000002955 isolation Methods 0.000 claims description 58
- 230000003321 amplification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
- H04N23/81—Camera processing pipelines; Components thereof for suppressing or minimising disturbance in the image signal generation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
Abstract
The invention discloses an analog video signal water ripple suppression circuit and a panoramic parking system. By implementing the embodiment of the invention, even if the ground of the panoramic parking system and the ground of the vehicle-mounted multimedia have a potential difference, the vehicle-mounted multimedia system does not have the phenomenon of water ripple when displaying the video picture output by the panoramic parking system.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to an analog video signal water ripple suppression circuit and a panoramic parking system.
Background
The current universal 360-degree panoramic parking system is provided with analog video output interfaces such as CVBS, AHD and TVI for conveniently accessing a vehicle-mounted multimedia system to display, the interfaces have the advantages of simplicity, convenience and low cost, and most vehicle-mounted multimedia in the market at present supports analog video input interfaces. However, after the 360 ° panoramic parking system is connected to the vehicle-mounted multimedia system through the analog video channel interface (not limited to CVBS, AHD, TVI, etc.), the problem of water ripple interference is likely to occur during video image display, and particularly, when the video input circuit at the vehicle-mounted multimedia terminal is in a single-terminal input mode (one terminal is video signal input, and the other terminal is system ground), the problem is more likely to occur. The root cause of the problem is the ground loop interference consisting of the ground of the 360-degree panoramic parking system, the video output ground and the ground of the vehicle-mounted multimedia, the longer the ground wire or the video wire of the vehicle-mounted multimedia and the 360-degree panoramic parking system is, the more obvious the problem is, the larger the power of the vehicle-mounted multimedia and the 360-degree panoramic parking system is.
Disclosure of Invention
The embodiment of the invention provides an analog video signal water ripple suppression circuit and a panoramic parking system, which can suppress the problem that a video image has water ripple interference after a video signal of the conventional panoramic parking system is accessed into a vehicle-mounted multimedia.
An embodiment of the present invention provides an analog video signal water ripple suppression circuit, which is suitable for a panoramic parking system, and includes: the video signal isolation module and the isolation power supply module;
the voltage input end of the isolation power supply module is the voltage input end of the panoramic parking system, the voltage output end of the isolation power supply module is connected with the power supply input end of the video signal isolation module, the grounding end of the isolation power supply module is connected with the ground wire of the panoramic parking system, and the 0V wiring end of the isolation power supply module is connected with the ground wire of the vehicle-mounted multimedia system;
the video signal isolation module includes: the circuit comprises a differential operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor;
the first end of the first resistor is an analog video signal input end, and the second end of the first resistor is connected with the non-inverting input end of the differential operational amplifier;
the first end of the second resistor is connected with a ground wire of the panoramic parking system, and the second end of the second resistor is connected with the inverting input end of the differential operational amplifier;
the output end of the differential operational amplifier is connected with the first end of the fifth resistor, the second end of the fifth resistor is an analog video signal output end, and the analog video signal output end outputs an analog video signal to the vehicle-mounted multimedia system; the power input end of the differential operational amplifier is the power input end of the video signal isolation module; the grounding end of the differential operational amplifier is connected with the ground wire of the vehicle-mounted multimedia system;
the first end of the third resistor is connected with the ground wire of the vehicle-mounted multimedia system, and the second end of the third resistor is connected with the non-inverting input end of the differential operational amplifier;
the first end of the fourth resistor is connected with the inverting input end of the differential operational amplifier, and the second end of the fourth resistor is connected with the output end of the differential operational amplifier.
Further, the video signal isolation module further includes: a first capacitor and a second capacitor; the first end of the first capacitor is connected with the first end of the third resistor, and the second end of the first capacitor is connected with the second end of the third resistor; and the first end of the second capacitor is connected with the first end of the fourth resistor, and the second end of the second capacitor is connected with the second end of the fourth resistor.
Further, the isolation power supply module further includes a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a sixth resistor:
the first end of the third capacitor is connected with the voltage input end of the isolation power supply module, and the second end of the third capacitor is connected with the ground wire of the panoramic parking system;
the first end of the fourth capacitor is connected with the voltage input end of the isolation power supply module, and the second end of the fourth capacitor is connected with the ground wire of the panoramic parking system;
the first end of the fifth capacitor is connected with the voltage output end of the isolation power supply module, and the second end of the fifth capacitor is connected with the ground wire of the vehicle-mounted multimedia system;
the first end of the sixth capacitor is connected with the voltage output end of the isolation power supply module, and the second end of the sixth capacitor is connected with the ground wire of the vehicle-mounted multimedia system;
the first end of the sixth resistor is connected with the voltage output end of the isolation power supply module, and the second end of the sixth resistor is connected with the ground wire of the vehicle-mounted multimedia system.
Further, the first resistor, the second resistor, the third resistor and the fourth resistor are equal in resistance.
On the basis of the foregoing embodiment, another embodiment of the present invention provides a panoramic parking system, which includes a video output module and an analog video signal water ripple suppression circuit according to any one of the foregoing embodiments of the present invention; the video output module is connected with the video signal isolation module.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides an analog video signal water ripple suppression circuit and a panoramic parking system, which are provided with a video signal isolation module and an isolation power supply module, wherein the ground of the panoramic parking system is isolated from the ground of a vehicle-mounted multimedia system through a differential operational amplifier and the isolation power supply module, so that the vehicle-mounted multimedia system can not generate the water ripple phenomenon when displaying a video picture output by the panoramic parking system even if the ground of the panoramic parking system and the ground of the vehicle-mounted multimedia system have a potential difference.
Drawings
Fig. 1 is a schematic circuit diagram of an isolated power module in an analog video signal ripple suppression circuit according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a video signal isolation module in an analog video signal ripple suppression circuit according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a panoramic parking system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2: the embodiment of the invention provides an analog video signal water ripple suppression circuit, which is applied to a panoramic parking system and comprises a video signal isolation module and an isolation power supply module;
the voltage input end of the isolation power supply module U40 is the voltage input end of the panoramic parking system (the input voltage of the panoramic parking system is represented by VCCA-IN IN the drawing), the voltage output end of the isolation power supply module is connected with the power supply input end of the VIDEO signal isolation module (IN the drawing, the voltage input to the VIDEO signal isolation module is represented by VCCA-ISO), the grounding end of the isolation power supply module is connected with the grounding wire of the panoramic parking system (GND represents the ground of the panoramic parking system IN the drawing), and the 0V terminal of the isolation power supply module is connected with the grounding wire of the vehicle-mounted multimedia system (VIDEO-ISO-GND represents the ground of the vehicle-mounted multimedia system IN the drawing);
the video signal isolation module includes: the differential operational amplifier U37, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5; preferably, the resistances of the resistor R1, the resistor R2, the resistor R3, and the resistor R4 are all 1k Ω, so that the amplification factor of the differential operational amplifier is 1, that is, the differential operational amplifier only isolates an input analog video signal and does not amplify the input analog video signal, the model of the differential operational amplifier may be SGM8052, and the resistance of the fifth resistor may be 75 Ω.
A first end of the first resistor R1 is an analog VIDEO signal input end (IN the drawing, the analog VIDEO signal input end is denoted by VIDEO-IN), and a second end of the first resistor R1 is connected with a non-inverting input end of the differential operational amplifier U37;
a first end of the second resistor R2 is connected with a ground wire of a panoramic parking system, and a second end of the second resistor R2 is connected with an inverting input end of the differential operational amplifier U37;
the output end of the differential operational amplifier U37 is connected to the first end of the fifth resistor R5, the second end of the fifth resistor R5 is an analog VIDEO signal output end (in the present invention, an analog VIDEO signal output is represented by VIDEO-OUT), and the analog VIDEO signal output end outputs an analog VIDEO signal to the vehicle multimedia system; the power supply input end of the differential operational amplifier U37 is the power supply input end of the video signal isolation module; the grounding end of the differential operational amplifier U37 is connected with the ground wire of the vehicle-mounted multimedia system;
a first end of the third resistor R3 is connected with the ground wire of the vehicle-mounted multimedia system, and a second end of the third resistor R3 is connected with the non-inverting input end of the differential operational amplifier;
the first end of the fourth resistor R4 is connected with the inverting input end of the differential operational amplifier U37, and the second end of the fourth resistor R4 is connected with the output end of the differential operational amplifier U37.
In a preferred embodiment, the video signal isolation module further includes: a first capacitor C1 and a second capacitor C2; a first end of the first capacitor C1 is connected with a first end of the third resistor R3, and a second end of the first capacitor C1 is connected with a second end of the third resistor R3; the first end of the second capacitor C2 is connected to the first end of the fourth resistor R4, and the second end of the second capacitor C2 is connected to the second end of the fourth resistor R4. Preferably, the first capacitor and the second capacitor are both 10pF capacitors.
In a preferred embodiment, the isolated power module further includes a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, and a sixth resistor R6:
a first end of the third capacitor C3 is connected with a voltage input end of the isolated power supply module U40, and a second end of the third capacitor C3 is connected with a ground line of the panoramic parking system;
a first end of the fourth capacitor C4 is connected with a voltage input end of the isolated power supply module U40, and a second end of the fourth capacitor C4 is connected with a ground line of the panoramic parking system;
a first end of the fifth capacitor C5 is connected with a voltage output end of the isolation power supply module U40, and a second end of the fifth capacitor C5 is connected with a ground wire of the vehicle-mounted multimedia system;
a first end of the sixth capacitor C6 is connected with the voltage output end of the isolation power supply module U40, and a second end of the sixth capacitor C6 is connected with the ground wire of the vehicle-mounted multimedia system;
the first end of the sixth resistor R6 is connected with the voltage output end of the isolation power supply module U40, and the second end of the sixth resistor R6 is connected with the ground wire of the vehicle-mounted multimedia system.
The present invention uses a differential operational amplifier U37 for video signal isolation. An analog VIDEO signal VIDEO-IN of the 360-degree panoramic parking system is input to a non-inverting input end of the differential operational amplifier U37 through a 1K omega resistor R1, an analog ground GND of the 360-degree panoramic parking system is input to an inverting input end of the differential operational amplifier U37 through a 1K omega resistor R2, and the two signals form a differential input of the differential operational amplifier U37. The 1K resistor R3 and the 10pF capacitor C1 are connected in parallel from the non-inverting input end of the differential operational amplifier to the system ground VIDEO-ISO-GND of the vehicle-mounted multimedia. The output terminal of the differential operational amplifier U37 is connected to the inverting input terminal of the differential operational amplifier U37 through a 1K resistor R4, and a 10pF capacitor C2 is connected in parallel with the feedback resistor R4. The amplification factor of the amplification circuit is set to be 1 by the resistance parameters, namely, the analog video signal of the 360-degree panoramic parking system is not amplified and is only isolated. The output end of the differential operational amplifier U37 is output to the vehicle multimedia VIDEO input interface through a 75 Ω resistor R5, namely, the VIDEO-OUT signal is connected to the vehicle multimedia VIDEO input interface. The differential operational amplifier U37 is powered by an isolation power supply VCCA-ISO, the preferred VCCA-ISO is 4.5V, the voltage VCCA-IN of the 360-degree panoramic parking system generates an isolation voltage VCCA-ISO through an isolation power supply module U40 to supply power to the differential operational amplifier U37, and the isolation power supply module U40 simultaneously isolates the analog ground GND of the 360-degree panoramic parking system from the vehicle multimedia system ground VIDEO-ISO-GND.
As shown in fig. 3: on the basis of the above embodiment, another embodiment of the present invention provides a panoramic parking system, which includes a video output module and the above analog video signal ripple suppression circuit, wherein the video output module is connected to the video signal isolation module, and outputs an analog video signal to an analog video signal input terminal of the video signal isolation module.
By implementing the embodiment of the invention, the ground of the panoramic parking system is isolated from the ground of the vehicle-mounted multimedia system, so that even if the ground of the panoramic parking system cabinet and the ground of the vehicle-mounted multimedia have a potential difference, the vehicle-mounted multimedia system does not have the phenomenon of water ripple when displaying a video picture output by the panoramic parking system.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (5)
1. An analog video signal ripple suppression circuit suitable for use in a panoramic parking system, comprising: the video signal isolation module and the isolation power supply module;
the voltage input end of the isolation power supply module is the voltage input end of the panoramic parking system, the voltage output end of the isolation power supply module is connected with the power supply input end of the video signal isolation module, the grounding end of the isolation power supply module is connected with the ground wire of the panoramic parking system, and the 0V wiring end of the isolation power supply module is connected with the ground wire of the vehicle-mounted multimedia system;
the video signal isolation module includes: the circuit comprises a differential operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor;
the first end of the first resistor is an analog video signal input end, and the second end of the first resistor is connected with the non-inverting input end of the differential operational amplifier;
the first end of the second resistor is connected with a ground wire of the panoramic parking system, and the second end of the second resistor is connected with the inverting input end of the differential operational amplifier;
the output end of the differential operational amplifier is connected with the first end of the fifth resistor, the second end of the fifth resistor is an analog video signal output end, and the analog video signal output end outputs an analog video signal to the vehicle-mounted multimedia system; the power input end of the differential operational amplifier is the power input end of the video signal isolation module; the grounding end of the differential operational amplifier is connected with the ground wire of the vehicle-mounted multimedia system;
the first end of the third resistor is connected with the ground wire of the vehicle-mounted multimedia system, and the second end of the third resistor is connected with the non-inverting input end of the differential operational amplifier;
the first end of the fourth resistor is connected with the inverting input end of the differential operational amplifier, and the second end of the fourth resistor is connected with the output end of the differential operational amplifier.
2. The analog video signal water ripple suppression circuit of claim 1, wherein the video signal isolation module further comprises: a first capacitor and a second capacitor; the first end of the first capacitor is connected with the first end of the third resistor, and the second end of the first capacitor is connected with the second end of the third resistor; and the first end of the second capacitor is connected with the first end of the fourth resistor, and the second end of the second capacitor is connected with the second end of the fourth resistor.
3. The analog video signal water ripple suppression circuit of claim 1, wherein the isolated power supply module further comprises a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a sixth resistor:
the first end of the third capacitor is connected with the voltage input end of the isolation power supply module, and the second end of the third capacitor is connected with the ground wire of the panoramic parking system;
the first end of the fourth capacitor is connected with the voltage input end of the isolation power supply module, and the second end of the fourth capacitor is connected with the ground wire of the panoramic parking system;
the first end of the fifth capacitor is connected with the voltage output end of the isolation power supply module, and the second end of the fifth capacitor is connected with the ground wire of the vehicle-mounted multimedia system;
the first end of the sixth capacitor is connected with the voltage output end of the isolation power supply module, and the second end of the sixth capacitor is connected with the ground wire of the vehicle-mounted multimedia system;
the first end of the sixth resistor is connected with the voltage output end of the isolation power supply module, and the second end of the sixth resistor is connected with the ground wire of the vehicle-mounted multimedia system.
4. The analog video signal water ripple suppression circuit of claim 1, wherein the first resistor, the second resistor, the third resistor, and the fourth resistor are all equal.
5. A panoramic parking system comprising: a video output module and an analog video signal water ripple suppression circuit according to any one of claims 1 to 4; the video output module is connected with the video signal isolation module.
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CN212381265U (en) * | 2020-06-24 | 2021-01-19 | 广州四为电子科技有限公司 | Analog video signal water ripple suppression circuit and panoramic parking system |
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2020
- 2020-06-24 CN CN202010585363.1A patent/CN111770248A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1756371A (en) * | 2001-01-25 | 2006-04-05 | 株式会社尼康 | Image processing method, image processing program, and image processor |
KR101015040B1 (en) * | 2010-08-13 | 2011-02-16 | 엘아이지넥스원 주식회사 | Apparatus for removing image noise captured by a camera on a moving object and method thereof |
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