CN212012860U - Video acquisition circuit and law enforcement record appearance - Google Patents
Video acquisition circuit and law enforcement record appearance Download PDFInfo
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- CN212012860U CN212012860U CN202021264717.4U CN202021264717U CN212012860U CN 212012860 U CN212012860 U CN 212012860U CN 202021264717 U CN202021264717 U CN 202021264717U CN 212012860 U CN212012860 U CN 212012860U
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Abstract
The application provides a video acquisition circuit and law enforcement record appearance, the video acquisition circuit includes: the encoding chip is used for being connected with the camera module and receiving and encoding the video data acquired by the camera module to obtain encoded video data; the switching circuit is provided with a control end, a first end, a second end and a third end, wherein the first end is connected with the memory card slot, and the second end is connected with the coding chip; and the processing chip is respectively connected with the control end and the third end of the switching circuit and is used for controlling the switching circuit to connect the first end with the second end when detecting that a storage card is inserted into the storage card slot, so that the encoded video data can be stored in the storage card. Under the condition of inserting the memory card, the processing chip controls the switching circuit to connect the memory card with the coding chip, and only the coding chip consumes power while the processing chip is in a low-power-consumption suspended state when a video is recorded, so that the power consumption of the whole law enforcement recorder is reduced, and the heat of the circuit is reduced.
Description
Technical Field
The application relates to the technical field of video acquisition, in particular to a video acquisition circuit and a law enforcement recorder.
Background
When law enforcement agencies perform law enforcement, the law enforcement agencies need to use a law enforcement recorder to perform video acquisition so as to record the complete law enforcement process. With the improvement of network technology and the processing capacity of video coding chips, the high-density data brings huge challenges to bandwidth and storage, and the law enforcement recorders in the market basically adopt mobile phone chips produced by specific companies, use ARM to perform software compression coding, and have high power consumption and serious heating.
SUMMERY OF THE UTILITY MODEL
An object of the embodiments of the present application is to provide a video capture circuit and a law enforcement recorder, so as to improve the above technical problems.
In a first aspect, an embodiment of the present application provides a video capture circuit, which is used in a law enforcement recorder, the law enforcement recorder further includes a camera module and a memory card slot, and the circuit includes:
the coding chip is used for being connected with the camera module and receiving and coding the video data acquired by the camera module to obtain coded video data;
a switching circuit having a control terminal, a first terminal, a second terminal and a third terminal, for selectively connecting one of the second terminal and the third terminal with the first terminal, wherein the first terminal is connected with the memory card slot, and the second terminal is connected with the encoding chip;
and the processing chip is respectively connected with the control terminal and the third terminal and is used for controlling the switching circuit to connect the first terminal with the second terminal when detecting that a memory card is inserted into the memory card slot, so that the encoded video data can be stored in the memory card.
In the circuit, under the condition that a storage card is inserted into a storage card slot, the processing chip controls the switching circuit to connect the storage card with the coding chip, therefore, videos recorded by the camera module can be directly stored in the storage card after being coded, other operations can not be carried out in the process of recording the videos, the processing chip is in a low-power consumption hanging state at the moment, namely, only the coding chip consumes power when the videos are recorded, and the part of the power consumption of the coding chip during working is very low, so that the power consumption of the whole law enforcement recorder is reduced, and the heat of the circuit is reduced.
In an optional implementation manner, the circuit further includes a network communication module, and the network communication module is connected to the processing chip and is configured to upload the encoded video data to a backend server.
In an alternative embodiment, the processing chip includes a memory; the processing chip is connected with the coding chip and used for receiving and storing the coded video data sent by the coding chip in the memory when the memory card is not detected to be inserted into the memory card slot.
The processing chip is internally provided with a memory with a certain capacity, so that the law enforcement recorder does not need to rely on a memory card, and can still store coded video data through the memory in the processing chip under the condition that the memory card is not inserted, namely, the law enforcement recorder still keeps working.
In an optional embodiment, the circuit further comprises a brightness sensor and an infrared lamp, and both the brightness sensor and the infrared lamp are connected with the coding chip.
When shooting the video night, the infrared lamp is opened, and the infrared lamp sends infrared light and shines the object, is received by the module of making a video recording after the infrared light diffuse reflection, forms video data to make law enforcement record appearance possess good video acquisition at night ability.
In an alternative embodiment, the circuit further comprises a first isolation circuit; the first isolation circuit includes: the memory card comprises a first resistor, a second resistor, a first capacitor, a first field effect transistor and a first diode, wherein the first end of the first resistor is connected with an enabling control end of the coding chip and used for receiving a power supply enabling signal of the coding chip, the second end of the first resistor is connected with a grid electrode of the first field effect transistor, a source electrode of the first field effect transistor is respectively connected with a power supply output end of the coding chip, the first end of the second resistor and the first end of the first capacitor, the second end of the second resistor and the second end of the first capacitor are connected with the grid electrode of the first field effect transistor, a drain electrode of the first field effect transistor is connected with an anode of the first diode, and a cathode of the first diode is connected with a power supply input end of the memory card slot.
In an alternative embodiment, the circuit further comprises a second isolation circuit; the second isolation circuit includes: the anode of the second diode is connected with the power output end of the processing chip, the cathode of the second diode and the first end of the second capacitor are connected with the power input end of the memory card slot, and the second end of the second capacitor is grounded.
In the above two embodiments, by providing the first diode, the power supply voltage of the processing chip is isolated by the first diode in the first isolation circuit, and cannot reach the coding chip; through setting up the second diode for the supply voltage of code chip is kept apart by the second diode in the second isolating circuit, can't reach the processing chip, consequently, plays better power isolation effect when guaranteeing to the storage card power supply.
In an optional implementation manner, the circuit further includes a battery unit and a power conversion unit, the battery unit is connected to the processing chip, and the power conversion unit is respectively connected to the battery unit and the encoding chip; the battery unit is used for supplying power to the processing chip, and the power supply conversion unit is used for converting the power supply voltage of the battery unit into the working voltage of the coding chip and supplying power to the coding chip.
In an optional implementation manner, the circuit further includes a key assembly, and the key assembly is connected to the processing chip and is used for controlling the camera module to collect or stop collecting the video data.
In an optional implementation, the encoding chip is an h.265 encoding standard chip.
In the above scheme, by adopting the h.265 coding technology, half of the storage space can be saved compared with the h.264 coding technology under the same image quality, and the video with longer time can be stored under the same storage capacity, so that the cyclic backup of the acquisition station for several weeks can be prolonged to several months, and the hardware expense of the storage device can be reduced by several times.
In a second aspect, an embodiment of the present application provides a law enforcement recorder, including: an instrument housing; a camera module; the memory card slot is used for inserting a memory card; a video acquisition circuit as described in the first aspect disposed within the instrument housing.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic diagram of a video capture circuit provided in an embodiment of the present application;
fig. 2 is a specific circuit diagram of the camera module in the embodiment of the present application;
FIG. 3 is a specific circuit diagram of a switching circuit according to an embodiment of the present application;
fig. 4 is another schematic diagram of a video capture circuit according to an embodiment of the present disclosure;
fig. 5 is a circuit diagram of a first isolation circuit provided in an embodiment of the present application;
fig. 6 is a circuit diagram of a second isolation circuit according to an embodiment of the present application.
Icon: 110-a coding chip; 120-a switching circuit; 130-processing the chip; 140-a camera module; 150-memory card slot; 160-a brightness sensor; 170-infrared lamp; 180-key assembly.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
The embodiment of the application provides a video acquisition circuit for in law enforcement record appearance, this law enforcement record appearance still includes: the camera module and the memory card slot. Fig. 1 shows a schematic diagram of the video acquisition circuit, which comprises: the video camera comprises an encoding chip 110, a switching circuit 120 and a processing chip 130, wherein the encoding chip 110 is connected with a camera module 140 and is used for receiving and encoding video data acquired by the camera module 140 to obtain encoded video data; the switching circuit 120 has a control terminal, a first terminal, a second terminal and a third terminal, the switching circuit 120 is configured to selectively connect one of the second terminal and the third terminal to the first terminal, the first terminal is connected to the memory card slot 150, and the second terminal is connected to the encoding chip 110; the processing chip 130 is connected to the control terminal and the third terminal of the switching circuit 120, respectively, and is configured to control the switching circuit 120 to connect the first terminal and the second terminal when detecting that a memory card is inserted into the memory card slot 150, so that the encoded video data can be stored in the memory card.
When the law enforcement recorder is powered on, the processing chip 130 detects whether a memory card is inserted into the memory card slot 150, if the memory card is inserted, a first control level signal (for example, a high level signal) is sent to the control end of the switching circuit 120, after the control end of the switching circuit 120 receives the first control level signal, the first end and the second end are connected, a data channel of the memory card is communicated with the encoding chip 110, after video acquisition is started, the encoding chip 110 receives and encodes video data acquired by the camera module 140 in real time, and the encoded video data is stored in the memory card.
Further, the processing chip 130 can also send a second control level signal (for example, a low level signal) to the control terminal of the switching circuit 120, and after the control terminal of the switching circuit 120 receives the second control level signal, the first terminal and the third terminal of the switching circuit 120 are connected to connect the data channel of the memory card with the processing chip 130, so that the processing chip 130 can access the memory card to obtain the encoded video data therein. Based on this embodiment, the video capture circuit further comprises: and the network communication module is connected with the processing chip and is in communication connection with the background server, wherein the network communication module can be one part of the processing chip and can also be independent of the processing chip. The processing chip receives the shooting end signal, sends a second control level signal to the control end of the switching circuit, enables the first end and the third end of the switching circuit to be connected, accesses the coded video data in the storage card, and uploads the coded video data to the background server through the network communication module.
Fig. 2 shows a specific circuit diagram of the camera module in the embodiment of the present application. As shown in fig. 2, pins numbered A3-a 6 on the left side of a chip U1201 in the camera module are connected to a coding chip, and are used for reading an address of the camera module and transmitting a start signal and a stop signal of video acquisition, so as to control the camera module, pins numbered D2-D5, C4, and E5 on the left side of the chip U1201 are connected to the coding chip, and are used for transmitting acquired video data to the coding chip, a power input end on the right side of the chip U1201 is connected to a processing chip, and specifically, the processing chip supplies power to the camera module through pins VCAMIO _ PMU, VCAMA _ PMU, and VCAMD _ PMU.
Fig. 3 shows a specific circuit diagram of the switching circuit in the embodiment of the present application. As shown in FIG. 3, the switching circuit comprises a switching chip U1401, pins COM 1-COM 6 of the switching chip U1401 are first ends, COM 1-COM 4 are respectively connected with data pins (TF _ DAT 0-TF _ DAT3) on the memory card slot, COM5 is connected with a command and response multiplexing pin (TF _ CMD) on the memory card slot, and COM6 is connected with a clock pin (TF _ CLK) on the memory card slot. The pins NC1 to NC6 of the switching chip U1401 are third terminals, NC1 to NC4 are connected to data pins (MSDC1_ DAT0 to MSDC1_ DAT3) on the processing chip, NC5 is connected to a command and response multiplexing pin (MSDC1_ CMD) on the processing chip, and NC6 is connected to a clock pin (MSDC1_ CLK) on the processing chip, respectively. Pins NO 1-NO 6 of the switching chip U1401 are second ends, NO 1-NO 4 are respectively connected with data pins (SDIO0_ DAT 0-SDIO 0_ DAT3) on the coding chip, NO5 is connected with a command and response multiplexing pin (SDIO0_ CMD) on the coding chip, and NO6 is connected with a clock pin (SDIO0_ CLK) on the coding chip. Pins IN1, IN2 of the switch chip U1401 are control terminals for connection to a processing chip. The power supply end (VCC) of the switching chip is connected to the battery unit (VBAT) to take power.
The operating principle of the switching circuit is as follows:
in the default state of the switching chip, COM1 is connected with NC1, COM2 is connected with NC2, COM3 is connected with NC3, COM4 is connected with NC4, COM5 is connected with NC5, COM6 is connected with NC6, that is, the memory card slot is connected with the processing chip. After the processing chip detects that a memory card is inserted into the memory card slot, the GPIO152_ TF _ SW is in a high level state, and the switching chip switches on COM1 and NO1, COM2 and NO2, COM3 and NO3, COM4 and NO4, COM5 and NO5 and COM6 and NO6 under the action of a high level signal, namely the memory card slot is switched on with the coding chip. After the video acquisition is finished, the GPIO152_ TF _ SW is in a low level state, and the switching chip switches the COM1 and the NC1, the COM2 and the NC2, the COM3 and the NC3, the COM4 and the NC4, the COM5 and the NC5, and the COM6 and the NC6 again under the action of a low level signal.
Optionally, the processing chip includes a memory, and the processing chip is connected to the encoding chip (for example, connected through a USB interface or other data communication bus) and configured to receive and store the encoded video data sent by the encoding chip in the memory when it is not detected that the memory card is inserted into the memory card slot.
In this embodiment, when a memory card is not inserted into a memory card slot of the law enforcement recorder, the encoding chip acquires video data acquired by the camera module and encodes the video data to obtain encoded video data, and sends the encoded video data to the connected processing chip, and the processing chip stores the encoded video data in the internal memory. Thus, it is possible for the law enforcement recorder to operate without relying on a memory card, and without the memory card inserted.
In an embodiment, the processing chip may be a mobile phone chip, on which an operating system (e.g., an android system or other operating systems) is loaded, and may have a certain operating memory and a larger storage space, such as a 2G operating memory and a 16G storage space. Through the operating system carried on the law enforcement recorder, the law enforcement recorder is similar to a mobile phone operating interface in the aspects of touch and user interface, and a plurality of key assemblies can be arranged on the law enforcement recorder, for example, a switch key, a video recording key, a call for help (SOS) key, a volume use key and the like are arranged, so that a user can quickly select and set, and therefore, a worker can quickly get on the hand, and the use threshold of the law enforcement recorder is low. Specifically, the processing chip may be any type of mobile phone chip produced by companies such as the company department, the high-pass company, and the like.
Optionally, as shown in fig. 4, the video capture circuit further includes: the brightness sensor 160 and the infrared lamp 170 are connected with the coding chip 110; the brightness sensor 160 is used for detecting the ambient brightness; the encoding chip 110 is used for controlling the infrared lamp 170 to emit infrared light when the ambient brightness is lower than a preset value.
The brightness sensor detects the ambient brightness, converts the optical signal into an electric signal and transmits the electric signal to the coding chip, and the coding chip determines whether to start the infrared lamp according to the electric signal. When shooting the video daytime, can need not open the infrared lamp, when shooting the video night, the infrared lamp is opened, and the infrared lamp sends infrared light and shines the object, is received by the module of making a video recording after the infrared light diffuse reflection, forms video data to make law enforcement record appearance possess good video acquisition ability at night.
In fig. 4, the video capture circuit further comprises: and the key assembly 180, the key assembly 180 is connected with the processing chip 130 and used for controlling the camera module to collect or stop collecting video data, and the key assembly is a video recording key. After this button subassembly is pressed, the processing chip receives the signal of telecommunication of button subassembly, generates video acquisition's the start signal to give the code chip with start signal transmission, the code chip gives the module of making a video recording with start signal transmission, makes the module of making a video recording start video acquisition. After this button subassembly pushes down again (or bounce), the processing chip receives button subassembly's the signal of telecommunication (be the end signal of making a video recording in the preamble), generates video acquisition's stop signal to give the coding chip with stop signal transmission, the coding chip gives the module of making a video recording with stop signal transmission, makes the module of making a video recording stop video acquisition, and simultaneously, the processing chip sends the second control level signal to switching circuit's control end, makes switching circuit's first end and third end switch-on.
In the video capture circuit, in addition to the key assembly, other key assemblies are included, for example: a switch key, a call for help key (SOS), a volume use key and the like, and the key components are connected with the processing chip. Further, the processing chip is connected with a display screen, and the display screen can show the system interface so that the staff can set the law enforcement recorder and can also display the video collected by the camera module currently or the video stored in the playback memory card. The display screen can be a touch display screen, the display screen has a touch function while providing a display function, and a worker can perform parameter setting of the law enforcement recorder by touching icons or options on the display screen. Of course, the display screen may not be a touch display screen, and the processing chip is additionally connected to a touch device, so that parameter setting is completed through the touch device.
In this embodiment, the processing chip is powered by the battery unit, the processing chip is connected to the battery unit, and the power supply voltage requirements of the coding chip and other components are lower than that of the processing chip, so that the video capture circuit further includes: the power supply comprises a first power supply conversion unit and a second power supply conversion unit. The first power conversion unit is connected to the battery unit and the coding chip, respectively, and is configured to convert a power voltage of the battery unit into an operating voltage of the coding chip and supply power to the coding chip, for example, the first power conversion unit converts a 4V voltage of the battery unit into a 3.3V voltage. The second power supply conversion unit is respectively connected with the battery unit and the infrared lamp and is used for converting the power supply voltage of the battery unit into the working voltage of the infrared lamp and supplying power to the infrared lamp.
Further, since the memory card slot may be selectively connected to the encoding chip or the processing chip, in this embodiment, power supply of the memory card may also be switched between the encoding chip and the processing chip, for example, when the memory card slot is connected to the encoding chip, the memory card is powered by the encoding chip, and when the memory card slot is connected to the processing chip, the memory card is powered by the processing chip. In order to avoid the system leakage and the chip damage caused by the fact that the power supply voltage of the coding chip reaches the processing chip and the power supply voltage of the processing chip reaches the coding chip in the working process, the first isolation circuit and the second isolation circuit are provided in the embodiment.
As shown in fig. 5, the first isolation circuit includes: a first resistor R1408, a second resistor R1407, a first capacitor C1404, the first end of the first resistor R1408 is connected with the enable control end of the coding chip, the enable control end of the coding chip (SDIO0_ CARD _ POWER _ EN) can output a POWER supply enable signal, the first end of the first resistor R1408 is used for receiving the POWER supply enable signal, the second end of the first resistor R1408 is connected with the gate 1401 of the first field-effect transistor Q1401, the source of the first field-effect transistor Q1408 is respectively connected with the POWER supply output end of the coding chip, the first end of the second resistor R1407 and the first end of the first capacitor C1404, the second end of the second resistor R1407 and the second end of the first capacitor C1404 are connected with the gate of the first field-effect transistor Q1401, the drain of the first field-effect transistor Q1401 is connected with the anode of the first diode D1803, and the cathode of the first diode D1803 is connected with the POWER supply input end of the memory CARD slot.
In the example of fig. 5, the resistance of the first resistor R1408 is 100 ohms, the resistance of the second resistor R1407 is 47 kilo-ohms, the capacitance of the first capacitor C1404 is 100 nanofarads, and the first fet Q1401 is a P-channel fet. The above values are merely examples, and the circuit design in practical application is not limited thereto, and in addition, the first field effect transistor may also be an N-channel field effect transistor, and based on the type selection of the device, the connection relationship of each device in the first isolation circuit needs to be adjusted accordingly.
As shown in fig. 6, the second isolation circuit includes: a second diode D1804 and a second capacitor C1402, wherein an anode of the second diode D1804 is connected to the power output terminal VMCH _ PMU of the processing chip, a cathode of the second diode D1804 and a first end of the second capacitor C1402 are connected to the power input terminal VDD of the memory card slot J1402, and a second end of the second capacitor C1402 is grounded. In fig. 5 and 6, the cathode of the first diode D1803 in the first isolation circuit and the cathode of the second diode D1804 in the second isolation circuit are commonly connected to the power input terminal VDD of the memory card slot J1402.
In the example of fig. 6, the capacitance value of the second capacitor C1402 takes 4.7 microfarads. Of course, this value is merely an example, and the circuit design in practical application is not limited thereto.
The working principle of the first isolation circuit and the second isolation circuit is as follows:
the enable control end (SDIO0_ CARD _ POWER _ EN) of the coding chip outputs a POWER supply enable signal, and the grid voltage of the field effect transistor is changed through the level state of the POWER supply enable signal, so that the on and off of the source electrode and the drain electrode are controlled. The first isolation circuit is enabled when the enable control terminal SDIO0_ CARD _ POWER _ EN outputs a low level. When the enable control end outputs a low level, the low level is applied to the grid electrode of the first field effect transistor Q1401 to form source-drain current from the source electrode to the drain electrode, and 3.3V voltage output by the power output end of the coding chip reaches the power input end VDD of the storage card slot J1403 through the first field effect transistor Q1401 and the first diode D1803, so that power is supplied to the storage card.
The first isolation circuit is not enabled when the enable control terminal SDIO0_ CARD _ POWER _ EN outputs a high level. When the enable control end outputs a high level, the high level is applied to the grid electrode of the first field effect transistor Q1401, the source electrode and the drain electrode are cut off, and the 3.3V voltage output by the power supply output end of the coding chip cannot supply power to the memory card. At this time, the power output terminal VMCH _ PMU of the processing chip in the second isolation circuit supplies power to the power input terminal VDD of the memory card slot through the second diode D1804, thereby supplying power to the memory card.
Because first isolating circuit and second isolating circuit all are connected to the power input end of storage card draw-in groove to the storage card power supply, through setting up first diode and second diode, make the supply voltage of code chip isolated by the second diode in the second isolating circuit, can't reach the processing chip, simultaneously, the supply voltage of processing chip is isolated by the first diode in the first isolating circuit, can't reach the code chip, and then play better power isolation effect when supplying power.
Further, the encoding chip in this embodiment encodes the video data by using the h.265 encoding standard. Most law enforcement recorders in the market adopt the H.264 coding standard for coding, the compression rate is low, and the H.265 audio and video coding technology is adopted, so that the storage space can be saved by half compared with the H.264 coding technology under the same image quality, the video with longer time can be stored under the same storage capacity, therefore, the cyclic backup of a collection station for a plurality of weeks can be prolonged to a plurality of months, and the hardware expense of storage equipment can be reduced by a plurality of times.
It should be further noted that, the video acquisition circuit provided in this embodiment, through setting up the switching circuit, make processing chip power on the back automatically with storage card and coding chip switch on, then, the video that the module of making a video recording can directly be saved in the storage card after the coding, can not carry out other operations at all at the in-process of recording the video, processing chip is in low-power consumption hang-up state this moment, only need 4 ~ 5 milliampere electric current, when recording the video, only coding chip power consumptive, this part power consumption during coding chip during operation is very low, thereby can effectively reduce the generating heat of circuit of enforcing law, whole record appearance of enforcing law all works under low-power consumption state this moment. Through the switching circuit, the processing chip and the coding chip can share the storage resource of the same storage card. In addition, when video acquisition is not performed, for example, under scenes of viewing videos in the memory card, uploading videos to a background server, setting parameters and the like, the encoding chip can be in a closed state, that is, power supply of the encoding chip is stopped, so that power consumption is further saved.
Further, an embodiment of the present application provides a law enforcement recorder, including: instrument shell, the module of making a video recording, memory card draw-in groove and video acquisition circuit. The camera module is used for collecting video data, the storage card slot is used for inserting a storage card, and the video collecting circuit is a circuit provided by the previous embodiment and arranged in the instrument shell. The video acquisition circuit comprises an encoding chip, a switching circuit and a processing chip, the camera module is connected with the encoding chip in the video acquisition circuit, the storage card slot is connected with the switching circuit in the video acquisition circuit, and the switching circuit can selectively connect the storage card slot with the processing chip or connect the storage card slot with the encoding chip.
Optionally, a plurality of key assemblies connected to the processing chip are disposed in the video capture circuit, and the plurality of key assemblies are disposed on the surface of the instrument case.
It can be understood that the video capture circuit provided in the previous embodiment is used in the law enforcement recorder, and therefore, the law enforcement recorder may have the same technical effects as the video capture circuit, which is not described herein again, and the law enforcement recorder may be implemented with reference to the video capture circuit in the previous embodiment.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The utility model provides a video acquisition circuit for in the law enforcement record appearance, the law enforcement record appearance still includes module and the storage card draw-in groove of making a video recording, the circuit includes:
the coding chip is used for being connected with the camera module and receiving and coding the video data acquired by the camera module to obtain coded video data;
a switching circuit having a control terminal, a first terminal, a second terminal and a third terminal, for selectively connecting one of the second terminal and the third terminal with the first terminal, wherein the first terminal is connected with the memory card slot, and the second terminal is connected with the encoding chip;
and the processing chip is respectively connected with the control terminal and the third terminal and is used for controlling the switching circuit to connect the first terminal with the second terminal when detecting that a memory card is inserted into the memory card slot, so that the encoded video data can be stored in the memory card.
2. The circuit of claim 1, further comprising a network communication module, connected to the processing chip, for uploading the encoded video data to a background server.
3. The circuit of claim 1, wherein the processing chip comprises a memory; the processing chip is connected with the coding chip and used for receiving and storing the coded video data sent by the coding chip in the memory when the memory card is not detected to be inserted into the memory card slot.
4. The circuit of claim 1, further comprising a brightness sensor and an infrared lamp, both connected to the encoding chip.
5. The circuit of claim 1, further comprising a first isolation circuit; the first isolation circuit includes: the memory card comprises a first resistor, a second resistor, a first capacitor, a first field effect transistor and a first diode, wherein the first end of the first resistor is connected with an enabling control end of the coding chip and used for receiving a power supply enabling signal of the coding chip, the second end of the first resistor is connected with a grid electrode of the first field effect transistor, a source electrode of the first field effect transistor is respectively connected with a power supply output end of the coding chip, the first end of the second resistor and the first end of the first capacitor, the second end of the second resistor and the second end of the first capacitor are connected with the grid electrode of the first field effect transistor, a drain electrode of the first field effect transistor is connected with an anode of the first diode, and a cathode of the first diode is connected with a power supply input end of the memory card slot.
6. The circuit of claim 1, further comprising a second isolation circuit; the second isolation circuit includes: the anode of the second diode is connected with the power output end of the processing chip, the cathode of the second diode and the first end of the second capacitor are connected with the power input end of the memory card slot, and the second end of the second capacitor is grounded.
7. The circuit of claim 1, further comprising a battery unit and a power conversion unit, wherein the battery unit is connected with the processing chip, and the power conversion unit is respectively connected with the battery unit and the coding chip; the battery unit is used for supplying power to the processing chip, and the power supply conversion unit is used for converting the power supply voltage of the battery unit into the working voltage of the coding chip and supplying power to the coding chip.
8. The circuit of claim 1, further comprising a key assembly, wherein the key assembly is connected to the processing chip and is configured to control the camera module to capture or stop capturing the video data.
9. The circuit of any one of claims 1-8, wherein the encoding chip is an h.265 encoding standard chip.
10. A law enforcement recorder, comprising:
an instrument housing;
a camera module;
the memory card slot is used for inserting a memory card;
the video capture circuit of any of claims 1-9 disposed within the instrument housing.
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| CN202021264717.4U CN212012860U (en) | 2020-06-30 | 2020-06-30 | Video acquisition circuit and law enforcement record appearance |
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| CN202021264717.4U CN212012860U (en) | 2020-06-30 | 2020-06-30 | Video acquisition circuit and law enforcement record appearance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614920A (en) * | 2020-06-30 | 2020-09-01 | 深圳市卡卓无线信息技术有限公司 | Video acquisition circuit and law enforcement record appearance |
| CN113054711A (en) * | 2021-03-29 | 2021-06-29 | 深圳市卡卓无线信息技术有限公司 | Charging circuit with multiple charging ports |
-
2020
- 2020-06-30 CN CN202021264717.4U patent/CN212012860U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614920A (en) * | 2020-06-30 | 2020-09-01 | 深圳市卡卓无线信息技术有限公司 | Video acquisition circuit and law enforcement record appearance |
| CN113054711A (en) * | 2021-03-29 | 2021-06-29 | 深圳市卡卓无线信息技术有限公司 | Charging circuit with multiple charging ports |
| CN113054711B (en) * | 2021-03-29 | 2024-04-19 | 深圳市卡卓无线信息技术有限公司 | Charging circuit with multiple charging ports |
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