Analog video switching circuit and debugging device

Abstract

The utility model provides an analog video switching circuit and a debugging device, and relates to the technical field of video monitoring, the circuit comprises a connector, a comparison circuit, a switch switching circuit and a chipset, the first end of the connector is respectively connected with the input end of the comparison circuit and the input end of the switch switching circuit; the chipset comprises a first chip and at least one second chip which are arranged in the multi-camera equipment; the output end of the comparison circuit is connected with the input end of the first chip; the signal output end of the first chip is connected with the selection end of the switch switching circuit, and the data output end corresponding to the first chip and the data output end corresponding to the at least one second chip are correspondingly connected with at least two input ends of the switch switching circuit. According to the utility model, the installation and debugging efficiency of multi-camera equipment can be improved through automatic switching of multi-channel analog video signals.

Description

Technical Field

[0001] The utility model relates to the technical field of video monitoring, in particular to an analog video switching circuit and a debugging device. Background Art

[0002] With the rapid development of video surveillance technology, there are more and more multi-camera devices. To facilitate the installation and debugging of multi-camera devices on poles, multi-camera devices are connected to terminals such as Engineering Bao through the BNC (Bayonet Nut Connector) interface at the tail end to achieve analog video output, that is, multi-camera devices realize CVBS (Composite Video Broadcast Signal) function.

[0003] The current multi-camera equipment only supports one analog video output. For example, the rotatable ball camera in the ball camera equipment supports analog video output, while the fixed device above the ball camera does not support the analog video output function. Therefore, when installing the rotatable ball camera in the ball camera equipment, if the shooting scene is not suitable, it can be corrected by rotating the device, but the fixed device above the ball camera cannot be rotated, which makes the installation difficult. In addition, during subsequent debugging, it is necessary to log in to the fixed device according to the IP address (Internet Protocol Address) in the observation room for debugging. The debugging process is relatively cumbersome, resulting in low installation and debugging efficiency of multi-camera equipment. Utility Model Content

[0004] The utility model provides an analog video switching circuit and a debugging device, which are used to solve the defect of low installation and debugging efficiency of multi-camera equipment in the prior art, and improve the installation and debugging efficiency of the multi-camera equipment through automatic switching of multi-channel analog video signals.

[0005] The utility model provides an analog video switching circuit, comprising: a connector, a comparison circuit, a switch switching circuit and a chipset, wherein:

[0006] The first end of the connector is connected to the input end of the comparison circuit and the input end of the switch switching circuit respectively; when the second end of the connector is connected to the load, the connector is used to generate a connection signal;

[0007] The chipset includes a first chip and at least one second chip arranged in a multi-camera device;

[0008] The output end of the comparison circuit is connected to the input end of the first chip, and the comparison circuit is used to generate a comparison signal based on the connection signal;

[0009] The signal output end of the first chip is connected to the selection end of the switch switching circuit, and the data output ends corresponding to the first chip and the at least one second chip are respectively connected to at least two input ends of the switch switching circuit; the first chip is used to generate a switch switching signal corresponding to the switch switching circuit based on the number of the comparison signals, and the switch switching signal is used to determine the target chip from the first chip and the at least one second chip; after establishing a connection relationship between the switch switching circuit and the target chip, the switch switching circuit is used to receive an analog video signal output by the target chip and transmit the analog video signal to the load.

[0010] According to the analog video switching circuit provided by the utility model, the comparison circuit includes an isolation subcircuit and a comparison subcircuit, wherein:

[0011] The input end of the isolation subcircuit is used as the input end of the comparison circuit, and the output end of the isolation subcircuit is connected to the input end of the comparison subcircuit; the isolation subcircuit is used to generate an isolation signal corresponding to the connection signal;

[0012] The output end of the comparison subcircuit serves as the output end of the comparison circuit, and the comparison subcircuit is used to compare the isolation signal with a reference signal to generate the comparison signal.

[0013] According to the analog video switching circuit provided by the utility model, the comparison subcircuit includes a comparator, a resistor R1 and a reference circuit, wherein:

[0014] The non-inverting input terminal of the comparator is connected to one end of the resistor R1, and the non-inverting input terminal of the comparator serves as the input terminal of the comparison sub-circuit, the other end of the resistor R1 is connected to the output terminal of the comparator, and the output terminal of the comparator serves as the output terminal of the comparison sub-circuit, and the inverting input terminal of the comparator is connected to the output terminal of the reference circuit; the reference circuit is used to output the reference signal to the inverting input terminal of the comparator; the comparator is used to compare the isolation signal with the reference signal to generate the comparison signal.

[0015] According to the analog video switching circuit provided by the utility model, the reference circuit includes a resistor R2 and a resistor R3, wherein:

[0016] The resistor R2 and the resistor R3 are connected in series, and the connection point of the resistor R2 and the resistor R3 serves as the output end of the reference circuit, the end of the resistor R2 away from the resistor R3 is connected to the power supply, and the end of the resistor R3 away from the resistor R2 is grounded; the reference circuit is used to generate a voltage division signal corresponding to the power supply, and determine the voltage division signal as the reference signal.

[0017] According to the analog video switching circuit provided by the utility model, the isolation subcircuit includes a capacitor C1, an operational amplifier and a resistor R4, wherein:

[0018] One end of the capacitor C1 serves as the input end of the isolation sub-circuit, the other end of the capacitor C1 is connected to the non-inverting input end of the operational amplifier, the inverting input end of the operational amplifier is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the output end of the operational amplifier, and the output end of the operational amplifier serves as the output end of the isolation sub-circuit.

[0019] According to the analog video switching circuit provided by the utility model, the switch switching circuit includes a switch, the power supply end of the switch is connected to the power supply, the selection end of the switch serves as the selection end of the switch switching circuit, at least two input ends of the switch serve as at least two input ends of the switch switching circuit, and the output end of the switch serves as the output end of the switch switching circuit;

[0020] The switch is used to receive the analog video signal output by the target chip corresponding to the switch switching signal based on the switch switching signal of the first chip.

[0021] According to the analog video switching circuit provided by the utility model, the switch switching circuit also includes a filtering circuit, the output end of the filtering circuit serves as the output end of the switch switching circuit, the input end of the filtering circuit is connected to the output end of the switching switch, and the filtering circuit is used to generate a filtering signal corresponding to the analog video signal and output the filtering signal to the load.

[0022] According to the analog video switching circuit provided by the utility model, the filtering circuit includes a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C2 and a capacitor C3, wherein:

[0023] One end of the resistor R5 serves as the output end of the filter circuit, the resistor R6 and the capacitor C2 are connected in parallel, one end of the parallel connection is connected to the other end of the resistor R5 and one end of the resistor R7, and the other end of the parallel connection is grounded;

[0024] The resistor R8 and the capacitor C3 are connected in parallel, one end of the parallel connection is connected to the other end of the resistor R7, and one end of the parallel connection serves as the input end of the filter circuit, and the other end of the parallel connection is grounded.

[0025] According to the analog video switching circuit provided by the utility model, the first chip includes a processor and a counter, wherein:

[0026] The counter is connected to the processor, and the counter is used to count the number of the comparison signals;

[0027] The input end of the processor serves as the input end of the first chip, the data output end of the processor serves as the data output end of the first chip, and the signal output end of the processor serves as the signal output end of the first chip.

[0028] The utility model also provides a debugging device, comprising a load and the analog video switching circuit as described in any one of the above items, wherein the load is connected to the analog video switching circuit.

[0029] The utility model provides an analog video switching circuit and debugging device. When a connector is connected to a load, the connector generates a connection signal and sends the connection signal to a comparison circuit. The comparison circuit generates a comparison signal according to the connection signal and sends the comparison signal to a first chip. The first chip determines the connection state between the connector and the load according to the comparison signal, and counts the number of comparison signals. According to the number of comparison signals, a switch switching signal corresponding to the switch switching circuit is generated, so that the switch switching circuit determines a target chip from the first chip and at least one second chip through the switch switching signal, establishes a connection relationship between the switch switching circuit and the target chip, and transmits an analog video signal output by the target chip to the load. By automatically switching the connection relationship between the switch switching circuit and the first chip and the at least one second chip, the load can be debugged in real time on site according to the analog video signals output by different lines, thereby improving the installation and debugging efficiency of multi-camera equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 It is a structural schematic diagram of an analog video switching circuit provided by an embodiment of the utility model.

[0032] Figure 2 It is a connection diagram of a comparison circuit provided in an embodiment of the utility model.

[0033] Figure 3 It is a circuit diagram of a comparison circuit provided in an embodiment of the utility model.

[0034] Figure 4 This is one of the connection diagrams of the switch switching circuit provided in the embodiment of the utility model.

[0035] Figure 5 This is the second connection diagram of the switch switching circuit provided in the embodiment of the utility model.

[0036] Figure 6 It is a circuit diagram of a switch switching circuit provided in an embodiment of the utility model.

[0037] Figure 7 It is a structural schematic diagram of a debugging device provided in an embodiment of the utility model.

[0038] Reference numerals:

[0039] 100: analog video switching circuit; 110: connector; 120: comparison circuit; 121: isolation sub-circuit; 122: comparison sub-circuit; 1221: reference circuit; 130: switch switching circuit; 131: filtering circuit; 140: chipset; 141: first chip; 142: second chip; 200: load. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In view of the problem of low installation and debugging efficiency of multi-camera equipment in the prior art, an embodiment of the utility model provides an analog video switching circuit. Figure 1 Schematic diagram of the structure of the analog video switching circuit provided by the embodiment of the utility model. Figure 1 As shown, the analog video switching circuit 100 includes: a connector 110 , a comparison circuit 120 , a switch circuit 130 and a chipset 140 .

[0042] The first end of the connector 110 is respectively connected to the input end of the comparison circuit 120 and the input end of the switch switching circuit 130 ; when the second end of the connector 110 is connected to the load 200 , the connector 110 is used to generate a connection signal.

[0043] The chipset 140 includes a first chip 141 and at least one second chip 142 provided in a multi-camera device.

[0044] The output end of the comparison circuit 120 is connected to the input end of the first chip 141 , and the comparison circuit 120 is used to generate a comparison signal based on the connection signal.

[0045] The signal output end of the first chip 141 is connected to the selection end SELECT of the switch switching circuit 130, and the data output ends corresponding to the first chip 141 and the at least one second chip 142 are respectively connected to at least two input ends of the switch switching circuit 130; the first chip 141 is used to generate a switch switching signal corresponding to the switch switching circuit 130 based on the number of the comparison signals, and the switch switching signal is used to determine the target chip from the first chip 141 and the at least one second chip 142; after establishing a connection relationship between the switch switching circuit 130 and the target chip, the switch switching circuit 130 is used to receive the analog video signal output by the target chip and transmit the analog video signal to the load 200.

[0046] Specifically, after the multi-camera device is installed on the pole, the staff can connect the connector 110 with the load 200 on site, so that the connector 110 generates a connection signal and sends the connection signal to the comparison circuit 120. The connection signal can be a voltage signal corresponding to the analog video signal. The comparison circuit 120 compares the connection signal with the reference signal to generate a comparison signal. After that, the comparison circuit 120 can send the comparison signal to the first chip 141. The first chip 141 can be understood as a control chip that controls the switch state of the switch switching circuit 130. At the same time, the first chip 141 and each second chip 142 can be understood as a chip controlled by the first chip 141 to output the analog video signal. After receiving the comparison signal, the first chip 141 can determine the state of the connector 110 and the load 200 according to the level state of the comparison signal. For example, when the comparison signal is a low-level signal, it indicates that the connector 110 is connected to the load 200. At this time, the comparison signal is a valid signal. When the comparison signal is a high-level signal, it indicates that the connector 110 is disconnected from the load 200. At this time, the comparison signal is an invalid signal. At the same time, the first chip 141 can count the number of valid comparison signals, that is, count the number of connections between the connector 110 and the load 200, generate a switch switching signal through the number of connections, and send the switch switching signal to the switch switching circuit 130. After receiving the switch switching signal, the switch switching circuit 130 can determine the target input terminal from at least two input terminals according to the switch switching signal. Since each input terminal corresponds to the first chip 141 and the at least one second chip 142 one by one, after determining the target input terminal, the target chip can be determined from the first chip 141 and the at least one second chip 142, and then the connection between the target input terminal and the target chip is realized. After the switch switching circuit 130 is connected to the target chip, the analog video signal in the target chip can be output to the load 200 through the switch switching circuit 130 and the connector 110 for display, which is convenient for the staff to view the image corresponding to the analog video signal in the load 200 in real time on site, and debug the installation of the whole machine according to the image. By automatically switching the connection relationship between the switch switching circuit 130 and the first chip 141 and at least one second chip 142, the analog video signals corresponding to the first chip 141 and each second chip 142 can be switched to output to the load 200 for on-site debugging, so that the multi-channel cameras of the multi-camera device can all realize the function of analog video signal output, greatly improving the installation and debugging efficiency of the multi-camera device. At the same time, the arbitrary switching of multiple analog video signals can be realized by plugging and unplugging only one connector 110 and the load 200, saving hardware costs.

[0047] It should be noted that the multi-camera device may be a camera device with multiple cameras, and the multiple cameras may include at least two fixed-point cameras, or one moving-point camera and at least one fixed-point camera, wherein: the fixed-point camera is a camera with a fixed monitoring angle, and the moving-point camera has a variable monitoring angle, which can be rotated, tilted, zoomed, and other dynamic adjustments. In the multi-camera device, in order to achieve that each camera can independently perform high-quality digital signal processing, a chip can be configured for each camera, and multiple chips constitute a chipset 140. In the chipset 140, the camera corresponding to the first chip 141 can be a fixed-point camera or a moving-point camera, and the camera corresponding to each second chip 142 can be a fixed-point camera or a moving-point camera, and the embodiment of the utility model does not limit this.

[0048] Optionally, the first chip 141 and each second chip 142 may be a DSP (Digital Signal Processing) chip or an ISP (Image Signal Processing) chip, which is not limited in the embodiment of the utility model.

[0049] Optionally, the connector 110 may be a BNC (Bayonet Nut Connector) interface.

[0050] Optionally, the load 200 may include a mobile terminal and the like, which is not limited in the embodiment of the present utility model.

[0051] Further, Figure 2 Schematic diagram of the connection of the comparison circuit provided by the embodiment of the utility model. Figure 2 As shown, the comparison circuit 120 includes an isolation sub-circuit 121 and a comparison sub-circuit 122 .

[0052] The input end of the isolation subcircuit 121 serves as the input end of the comparison circuit 120 , and the output end of the isolation subcircuit 121 is connected to the input end of the comparison subcircuit 122 ; the isolation subcircuit 121 is used to generate an isolation signal corresponding to the connection signal.

[0053] The output end of the comparison subcircuit 122 serves as the output end of the comparison circuit 120 . The comparison subcircuit 122 is used to compare the isolation signal with a reference signal to generate the comparison signal.

[0054] Specifically, after the connector 110 is connected to the load 200, the isolation sub-circuit 121 can isolate the comparison circuit 120 and reduce the interference of the connection signal to generate a stable isolation signal to ensure the accuracy and reliability of the comparison signal generated by the subsequent comparison sub-circuit 122 after comparing the isolation signal with the reference signal.

[0055] Further, Figure 3 is a circuit diagram of a comparison circuit provided by an embodiment of the utility model, such as Figure 3 As shown, the isolation sub-circuit 121 includes a capacitor C1, an operational amplifier U2 and a resistor R4, wherein:

[0056] One end of the capacitor C1 serves as the input end of the isolation sub-circuit 121, the other end of the capacitor C1 is connected to the non-inverting input end of the operational amplifier U2, the inverting input end of the operational amplifier U2 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the output end of the operational amplifier U2, and the output end of the operational amplifier U2 serves as the output end of the isolation sub-circuit 121.

[0057] Specifically, after the connector 110 generates a connection signal, the capacitor C1 in the isolation subcircuit 121 acts as an isolation element to isolate the comparison circuit 120 to prevent the comparison circuit 120 from affecting the original circuit. Afterwards, the operational amplifier U2 acts as a follower to increase the input impedance and reduce the output impedance, thereby reducing the interference of the connection signal and outputting a stable isolation signal.

[0058] It should be noted that the capacitance of the capacitor C1 can be determined according to the actual circuit conditions. For example, the capacitance of the capacitor C1 can be 200PF or 220PF, etc., and the embodiment of the present utility model does not limit this.

[0059] Furthermore, if Figure 3 As shown, the comparison subcircuit 122 includes a comparator U1, a resistor R1 and a reference circuit 1221, wherein:

[0060] The non-inverting input terminal of the comparator U1 is connected to one end of the resistor R1, and the non-inverting input terminal of the comparator U1 serves as the input terminal of the comparison sub-circuit 122. The other end of the resistor R1 is connected to the output terminal of the comparator U1, and the output terminal of the comparator U1 serves as the output terminal of the comparison sub-circuit 122. The inverting input terminal of the comparator U1 is connected to the output terminal of the reference circuit 1221.

[0061] The reference circuit 1221 is used to output the reference signal to the inverting input terminal of the comparator U1; the comparator U1 is used to compare the isolated signal with the reference signal to generate the comparison signal.

[0062] Furthermore, if Figure 3 As shown, the reference circuit 1221 includes a resistor R2 and a resistor R3, wherein:

[0063] The resistor R2 and the resistor R3 are connected in series, and the connection point between the resistor R2 and the resistor R3 serves as the output end of the reference circuit 1221, the end of the resistor R2 away from the resistor R3 is connected to the power supply, and the end of the resistor R3 away from the resistor R2 is grounded; the reference circuit 1221 is used to generate a voltage division signal corresponding to the power supply, and determine the voltage division signal as the reference signal.

[0064] For example, taking the output voltage of the power supply as 5V, the resistance of the resistor R2 as 3KΩ, and the resistance of the resistor R3 as 7KΩ, the voltage value of the voltage divided signal after the output voltage of the power supply is divided by the resistors R2 and R3 is 1.5V, and the voltage value of the voltage divided signal is the voltage value of the connection point of the resistors R2 and R3, that is, the voltage value of the reference signal at the inverting input terminal of the comparator U1. After the isolation signal is output to the non-inverting input terminal of the comparator U1, if the voltage value of the isolation signal is lower than the voltage value of the reference signal, the comparator U1 outputs a low-level signal, that is, the comparison signal is a low-level signal, at this time, indicating that the connector 110 is connected to the load 200; if the voltage value of the isolation signal is higher than the voltage value of the reference signal, the comparator U1 outputs a high-level signal, that is, the comparison signal is a high-level signal, at this time, indicating that the connector 110 is not connected to the load 200.

[0065] It should be noted that if the connector 110 is not connected to the load 200 , the comparator U1 will continuously output the comparison signal which is a high level signal.

[0066] Furthermore, the first chip 141 includes a processor and a counter, wherein:

[0067] The counter is connected to the processor, and the counter is used to count the number of the comparison signals;

[0068] The signal output end of the processor serves as the signal output end of the first chip 141 , the data output end of the processor serves as the data output end of the first chip 141 , and the input end of the processor serves as the input end of the first chip 141 .

[0069] Specifically, after the comparison circuit 120 outputs the comparison signal, the processor receives the comparison signal, and each time the comparison signal is received, it determines whether the comparison signal is a valid signal according to the level state of the comparison signal. If the comparison signal is a valid signal, a counting instruction is sent to the counter to increase the count in the counter by 1. If the comparison signal is an invalid signal, the next comparison signal is collected without counting. The processor can generate a switch switching signal through the count counted by the counter, that is, through the number of valid comparison signals counted, and the connection relationship between the switch switching circuit 130 and the first chip 141 and each second chip 142 is switched through the switch switching signal, that is, the target chip that outputs the analog video signal is switched through the switch switching signal, so as to realize real-time debugging of the camera corresponding to the target chip on site in the load 200.

[0070] Optionally, the switch switching signal may be a single continuous signal indicating only binary information, for example, the switch switching signal is a high level signal or a low level signal. In this case, it is applicable to a multi-camera device including two chips, that is, the multi-camera device includes a first chip 141 and a second chip 142. It may also be a pulse signal containing a multi-bit binary number encoding, for example, when the pulse signal is 000, it indicates that the switch switching circuit 130 is connected to the first chip 141A0, when the pulse signal is 010, it indicates that the switch switching circuit 130 is connected to the second chip 142A2, and when the pulse signal is 100, it indicates that the switch switching circuit 130 is connected to the second chip 142A4. In this case, it is applicable to a multi-camera device including at least three chips, that is, the multi-camera device includes a first chip 141 and at least two second chips 142. The embodiment of the utility model is not limited to this.

[0071] In addition, the frame rate of the analog video signal is relatively high, there are at least 25 frames of images per second, and there are hundreds of rows of pixels in each frame of the image, so there will be many valid comparison signals after the connector 110 is connected to the load 200. Therefore, when the first chip 141 detects the comparison signal, a detection cycle can be set, for example, the detection cycle can be 100 milliseconds, that is, a comparison signal is detected every 100 milliseconds, and the number of comparison signals is counted.

[0072] Further, Figure 4 This is one of the connection diagrams of the switch switching circuit provided by the embodiment of the utility model, such as Figure 4As shown, the switch switching circuit 130 includes a switch U3, the power end of the switch U3 is connected to the power supply, the selection end SELECT of the switch U3 serves as the selection end SELECT of the switch switching circuit 130, at least two input ends of the switch U3 serve as at least two input ends of the switch switching circuit 130, and the output end of the switch U3 serves as the output end of the switch switching circuit 130; the switch U3 is used to receive the analog video signal output by the target chip corresponding to the switch switching signal based on the switch switching signal of the first chip 141.

[0073] Specifically, a switch switching signal is generated in the first chip 141, and the switch switching signal is output to the selection end SELECT of the switch U3 through the signal output end of the first chip 141. The switch U3 can be understood as a channel selection switch. The switch switching signal can control the switch U3 to select a target input end from all input ends, that is, to select a target chip connected to the target input end from the first chip 141 and all second chips 142, and then switch the target input end to be connected with the target chip, so that the analog video signal of the target chip can be output to the load 200 through the switch switching circuit 130 and the connector 110 for subsequent debugging.

[0074] Optionally, the switch U3 may be a single-pole multi-throw switch or a data selector, which is not limited in the embodiment of the utility model.

[0075] Further, Figure 5 This is the second connection diagram of the switch switching circuit provided in an embodiment of the utility model. The switch switching circuit 130 also includes a filter circuit 131. The input end of the filter circuit 131 serves as the input end of the switch switching circuit 130. The output end of the filter circuit 131 is connected to the input end of the switching switch U3. The filter circuit 131 is used to generate a filter signal corresponding to the analog video signal and output the filter signal to the load 200.

[0076] Specifically, after the switch switching circuit 130 is connected to the target chip, the switch switching circuit 130 can receive the analog video signal corresponding to the target chip and transmit the analog video signal to the filter circuit 131. The filter circuit 131 can remove noise and interference in the analog video signal to ensure the clarity and accuracy of the analog video signal, and can also smooth the analog video signal to make the generated filtered signal more stable and reliable, ensuring the accuracy and reliability of the debugging result after the filtered signal is transmitted to the load 200.

[0077] Furthermore, the filtering circuit 131 includes a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C2 and a capacitor C3, wherein:

[0078] One end of the resistor R5 serves as the output end of the filter circuit 131; the resistor R6 and the capacitor C2 are connected in parallel, one end of the parallel connection is connected to the other end of the resistor R5 and one end of the resistor R7, and the other end of the parallel connection is grounded; the resistor R8 and the capacitor C3 are connected in parallel, one end of the parallel connection is connected to the other end of the resistor R7, and one end of the parallel connection serves as the input end of the filter circuit 131, and the other end of the parallel connection is grounded.

[0079] For example, Figure 6 is a circuit diagram of a switch switching circuit provided by an embodiment of the utility model, such as Figure 6 As shown, taking the multi-camera device including the first chip 141A0 and the second chip 142A1 as an example, the first chip 141A0 counts the number of connections between the connector 110 and the load 200 by counting the number of valid comparison signals. If the number of connections is an odd number, the switch switching signal generated by the first chip 141A0 can be a high-level signal, which is used to determine that the target input end of the switch U3 is B1, that is, the switch U3 is switched to connect with the first chip 141A0. Afterwards, the analog video signal corresponding to the first chip 141A0 is filtered by the filter circuit 131 to generate a filter signal, and the filter signal is sent to the load 200 through the connector 110 for debugging. If the number of connections is an even number, the switch switching signal generated by the first chip 141A0 can be a low-level signal, which is used to determine that the target input end of the switching switch U3 is B2, and the switching switch U3 is switched to be connected to the second chip 142A1. After that, the analog video signal corresponding to the second chip 142A1 is filtered by the filtering circuit 131 to generate a filtered signal, and the filtered signal is sent to the load 200 through the connector 110 for debugging.

[0080] The analog video switching circuit provided by the embodiment of the utility model, when the connector is connected to the load, the connector generates a connection signal and sends the connection signal to the comparison circuit, the comparison circuit generates a comparison signal according to the connection signal, and sends the comparison signal to the first chip, the first chip determines the connection state of the connector and the load according to the comparison signal, and counts the number of comparison signals, and generates a switch switching signal corresponding to the switch switching circuit according to the number of comparison signals, so that the switch switching circuit determines the target chip from the first chip and at least one second chip through the switch switching signal, establishes a connection relationship between the switch switching circuit and the target chip, and transmits the analog video signal output by the target chip to the load, and automatically switches the connection relationship between the switch switching circuit and the first chip and the at least one second chip respectively, so that the load can be debugged in real time on site according to the analog video signals output by different lines, thereby improving the installation and debugging efficiency of multi-camera equipment.

[0081] In addition, the present invention also provides a debugging device. Figure 7 Schematic diagram of the structure of the debugging device provided by the embodiment of the utility model, such as Figure 7 As shown, the debugging device includes a load 200 and an analog video switching circuit 100 as described in any one of the above items, and the load 200 is connected to the analog video switching circuit 100 .

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An analog video switching circuit, characterized in that: include: Connector, comparison circuit, switch circuit and chipset, wherein: The first end of the connector is connected to the input end of the comparison circuit and the input end of the switch switching circuit respectively; when the second end of the connector is connected to the load, the connector is used to generate a connection signal; The chipset includes a first chip and at least one second chip arranged in a multi-camera device; The output end of the comparison circuit is connected to the input end of the first chip, and the comparison circuit is used to generate a comparison signal based on the connection signal; The signal output terminal of the first chip is connected to the selection terminal of the switch switching circuit, and the data output terminals corresponding to the first chip and the at least one second chip are respectively connected to at least two input terminals of the switch switching circuit; the first chip is used to generate a switch switching signal corresponding to the switch switching circuit based on the number of the comparison signals, and the switch switching signal is used to determine the target chip from the first chip and the at least one second chip; After the connection relationship between the switch switching circuit and the target chip is established, the switch switching circuit is used to receive the analog video signal output by the target chip and transmit the analog video signal to the load.

2. The analog video switching circuit according to claim 1, characterized in that: The comparison circuit comprises an isolation subcircuit and a comparison subcircuit, wherein: The input end of the isolation subcircuit is used as the input end of the comparison circuit, and the output end of the isolation subcircuit is connected to the input end of the comparison subcircuit; the isolation subcircuit is used to generate an isolation signal corresponding to the connection signal; The output end of the comparison subcircuit serves as the output end of the comparison circuit, and the comparison subcircuit is used to compare the isolation signal with a reference signal to generate the comparison signal.

3. The analog video switching circuit according to claim 2, characterized in that: The comparison subcircuit includes a comparator, a resistor R1 and a reference circuit, wherein: The non-inverting input terminal of the comparator is connected to one end of the resistor R1, and the non-inverting input terminal of the comparator serves as the input terminal of the comparison sub-circuit, the other end of the resistor R1 is connected to the output terminal of the comparator, and the output terminal of the comparator serves as the output terminal of the comparison sub-circuit, and the inverting input terminal of the comparator is connected to the output terminal of the reference circuit; the reference circuit is used to output the reference signal to the inverting input terminal of the comparator; the comparator is used to compare the isolation signal with the reference signal to generate the comparison signal.

4. The analog video switching circuit according to claim 3, characterized in that: The reference circuit includes a resistor R2 and a resistor R3, wherein: The resistor R2 and the resistor R3 are connected in series, and the connection point of the resistor R2 and the resistor R3 serves as the output end of the reference circuit, the end of the resistor R2 away from the resistor R3 is connected to the power supply, and the end of the resistor R3 away from the resistor R2 is grounded; the reference circuit is used to generate a voltage division signal corresponding to the power supply, and determine the voltage division signal as the reference signal.

5. The analog video switching circuit according to claim 2, characterized in that: The isolation subcircuit includes a capacitor C1, an operational amplifier and a resistor R4, wherein: One end of the capacitor C1 serves as the input end of the isolation sub-circuit, the other end of the capacitor C1 is connected to the non-inverting input end of the operational amplifier, the inverting input end of the operational amplifier is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the output end of the operational amplifier, and the output end of the operational amplifier serves as the output end of the isolation sub-circuit.

6. The analog video switching circuit according to any one of claims 1 to 5, characterized in that: The switch switching circuit comprises a switch, a power supply end of the switch is connected to a power supply, a selection end of the switch serves as a selection end of the switch switching circuit, at least two input ends of the switch serve as at least two input ends of the switch switching circuit, and an output end of the switch serves as an output end of the switch switching circuit; The switch is used to receive the analog video signal output by the target chip corresponding to the switch switching signal based on the switch switching signal of the first chip.

7. The analog video switching circuit according to claim 6, characterized in that: The switch switching circuit also includes a filter circuit, the output end of the filter circuit serves as the output end of the switch switching circuit, the input end of the filter circuit is connected to the output end of the switching switch, and the filter circuit is used to generate a filter signal corresponding to the analog video signal and output the filter signal to the load.

8. The analog video switching circuit according to claim 7, characterized in that: The filter circuit includes a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C2 and a capacitor C3, wherein: One end of the resistor R5 serves as the output end of the filter circuit, the resistor R6 and the capacitor C2 are connected in parallel, one end of the parallel connection is connected to the other end of the resistor R5 and one end of the resistor R7, and the other end of the parallel connection is grounded; The resistor R8 and the capacitor C3 are connected in parallel, one end of the parallel connection is connected to the other end of the resistor R7, and one end of the parallel connection serves as the input end of the filter circuit, and the other end of the parallel connection is grounded.

9. The analog video switching circuit according to any one of claims 1 to 5, characterized in that: The first chip includes a processor and a counter, wherein: The counter is connected to the processor, and the counter is used to count the number of the comparison signals; The signal output end of the processor serves as the signal output end of the first chip, the data output end of the processor serves as the data output end of the first chip, and the input end of the processor serves as the input end of the first chip.

10. A debugging device, characterized in that: It comprises a load and the analog video switching circuit as described in any one of claims 1 to 9, wherein the load is connected to the analog video switching circuit.

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