Video switcher circuit

Abstract

The utility model discloses a video switcher circuit, which relates to the technical field of video switcher circuits and comprises a voltage stabilizing integrated circuit MC7812, and the voltage stabilizing integrated circuit MC7812 is connected with a video signal input end DATAIN. When the video switcher circuit is used, signals enter the switching circuit through the signal input end DATAIN, then unstable signals are converted into stable signals through the voltage stabilizing integrated circuit MC7812, signal conversion is carried out through the digital control analog switch, delay during data transmission is reduced through the output buffer, and the output buffer is used for outputting the stable signals. The video switcher circuit has the advantages that the data transmission efficiency and speed are improved, the output buffer and the enabling forbidding module are matched with each other, the output conflict of signals in a large-scale video matrix can be prevented, the efficiency is further improved, and the effects of preventing the signal conflict and improving the efficiency are achieved when the video switcher circuit is used.

Description

Technical Field

[0001] The utility model relates to the technical field of video switcher circuits, and particularly relates to a video switcher circuit. Background Technique

[0002] A video switcher is a device that selectively outputs multiple video signals to a single display device. It usually consists of multiple input ports and one output port. By selecting different input ports, the video signals can be switched. The function of the video switcher is to switch, repeat, process, and copy the image signals transmitted by the system, and can automatically or manually control multiple video signals, enabling a monitor to monitor the signals of multiple cameras. The circuit of the video switcher may contain various components and sub-circuits for realizing the switching, processing, and transmission of video signals, and the circuit design and implementation of the video switcher circuit may vary depending on the device model, usage, and functional requirements.

[0003] The existing video matrix switching systems are generally of small scale, and most of them control the switching of the video matrix through a keyboard connected by a serial port, which leads to cumbersome remote control, slow signal transmission speed, and easy output conflicts in multiple serial port connections in the video matrix. Content of the Utility Model

[0004] The purpose of the utility model is to provide a video switcher circuit to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A video switcher circuit, comprising:

[0006] A voltage regulator integrated circuit MC7812, the voltage regulator integrated circuit MC7812 is connected to the video signal input terminal DATAIN, and the voltage regulator integrated circuit MC7812 is connected in series with a switch K, and the output terminal of the voltage regulator integrated circuit MC7812 is connected to a digital control analog switch. One side of the outer wall of the digital control analog switch is sequentially connected with a voltage V, a resistor R, a resistor R2, and a resistor R1, and the other side of the outer wall of the digital control analog switch is sequentially connected with a voltage V2, a voltage V1, a current L2, a current L, and a current L1. The output terminal of the digital control analog switch is connected to an output buffer, and the output buffer is connected to an enable / disable module through 8 output lines. The enable / disable module is connected to the video signal output terminal DATAOUT.

[0007] Preferably, the voltage of the signal input terminal DATAIN is 220V, and the voltages on both sides of the outer wall of the voltage regulator integrated circuit MC7812 are 16V.

[0008] Preferably, the voltage V, resistor R, resistor R2 are connected in parallel with resistor R1, and the voltage V2, voltage V1, current L2, current L are connected in parallel with current L1.

[0009] Preferably, the resistance value of the circuit near the digital control analog switch is 3.3 KΩ.

[0010] Preferably, the current L1 and current L2 are the inlets, and the current L is the outlet.

[0011] Preferably, the voltage V2 and voltage V1 are the inlets, and the voltage V is the outlet.

[0012] Preferably, the resistor R is the outlet, and the resistors R2 and R1 are the inlets.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: When the video switcher circuit is in use, the signal first enters the switching circuit through the signal input terminal DATAIN. Then, the unstable signal is converted into a stable signal through the voltage regulator integrated circuit MC7812, and the signal is converted through the digital control analog switch. After that, the output buffer reduces the delay during data transmission, thereby improving the efficiency and speed of data transmission. Moreover, through the mutual cooperation of the output buffer and the enable / disable module, signal conflicts during the output in the large-scale video matrix can be prevented, thereby improving the efficiency. Therefore, when the video switcher circuit is in use, it plays a role in facilitating the prevention of signal conflicts and improving efficiency. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the video switcher circuit of the present utility model; Detailed Embodiments

[0015] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0016] Please refer to Figure 1, the present utility model provides a technical solution: a video switch circuit, comprising: a voltage regulator integrated circuit MC7812, the voltage regulator integrated circuit MC7812 is connected to the video signal input terminal DATAIN, and the voltage regulator integrated circuit MC7812 is connected in series with the switch K, and the output terminal of the voltage regulator integrated circuit MC7812 is connected to the digital control analog switch. One side of the outer wall of the digital control analog switch is sequentially connected with a voltage V, a resistor R, a resistor R2 and a resistor R1, and the other side of the outer wall of the digital control analog switch is sequentially connected with a voltage V2, a voltage V1, a current L2, a current L and a current L1. The output terminal of the digital control analog switch is connected to the output buffer, and the output buffer is connected to the enable / disable module through 8 output lines. The enable / disable module is connected to the video signal output terminal DATAOUT; the voltage of the signal input terminal DATAIN is 220V, and the voltages on both sides of the outer wall of the voltage regulator integrated circuit MC7812 are 16V; the voltage of the signal input terminal DATAIN is 220V, and the voltages on both sides of the outer wall of the voltage regulator integrated circuit MC7812 are 16V; the voltage V, the resistor R, the resistor R2 and the resistor R1 are connected in parallel with each other, and the voltage V2, the voltage V1, the current L2, the current L and the current L1 are connected in parallel with each other; the resistance value of the circuit near the digital control analog switch is 3.3KΩ; the current L1 and the current L2 are the inlets, and the current L is the outlet; the voltage V2 and the voltage V1 are the inlets, and the voltage V is the outlet; the resistor R is the outlet, and the resistor R2 and the resistor R1 are the inlets; the model of the digital control analog switch is CD4053, and CD4053 is a three-channel digital control analog switch; the voltage regulator integrated circuit MC7812 is a three-terminal voltage regulator integrated circuit IC chip component, and the model of the output buffer is 74HC14PW.

[0017] During specific implementation, when switching the video signal through the video switch circuit, after the video signal enters the circuit through the video signal input terminal DATAIN, it first passes through the voltage regulator integrated circuit MC7812. Since the voltage regulator integrated circuit MC7812 has the characteristics of good output stability and convenient use, and also has the functions of overcurrent and overheat automatic protection, it can, to a certain extent, protect the circuit from being affected by overload or overheat, protect the safe use of the power supply, and can also convert the unstable input voltage into a stable output voltage.

[0018] Next, the signal arrives at the digital control analog switch. At this time, through the switching circuit inside the digital control analog switch, the selection and switching of the input signal are realized. The digital control analog switch selects the path for the input signal to reach the output terminal through the logic level at the control terminal, thereby realizing the multiplexing of analog signals, the switching of signals, and the connection between various circuits, improving the communication quality and stability. Moreover, the digital control analog switch also has an internal circuit protection function, which can prevent circuit faults such as power supply offset and electrostatic breakdown;

[0019] After that, the converted signal arrives at the output buffer. Since the output buffer can temporarily store the data to be output in the memory and perform unified processing before outputting it all at once, the efficiency and speed of data transmission are improved. And because the output buffer can process and output a relatively large amount of data at one time, the number of data transmissions can be reduced to a certain extent, thereby reducing the delay during data transmission.

[0020] Next, the signal arrives at the enable / disable module. When the input enable signal is at a high level, the current bias generation circuit inside the module is turned on to provide current bias for each module in the chip and start working; when the input enable signal is at a low level, the current bias generation circuit is turned off, and at the same time, the charge discharge path of the large capacitor for compensating the gate of the adjustment transistor is turned on to achieve the fast turn-off of the LDO. Thus, the user can control the turning on or off of a specific module or device by changing the state of the enable signal, which can flexibly control the functions of the system and the use of resources according to actual needs;

[0021] Moreover, through the mutual cooperation of the output buffer and the enable / disable module, multiple disabled output pins can be connected together. When power is applied or an asynchronous reset occurs, all output pins will be initialized to the disabled state, thereby avoiding signal conflicts in the output of a large-scale video matrix, improving the transmission efficiency, and playing a role in facilitating the prevention of signal conflicts and improving efficiency when using the video switch circuit.

[0022] In summary, when the video switch circuit is in use, the signal first enters the switching circuit from the signal input terminal DATAIN. Then, after the voltage is stabilized by the voltage regulator integrated circuit MC7812, the signal reaches the digital control analog switch, and the signal is converted through the digital control analog switch. After that, the converted signal reaches the output buffer. At this time, the output buffer improves the efficiency and speed of data transmission, reduces latency, and through the enable / disable module, allows the user to flexibly control the functions of the system and the use of resources according to actual needs. Moreover, through the mutual cooperation of the output buffer and the enable / disable module, signal output conflicts in a large-scale video matrix can be prevented, and the efficiency can be improved. After that, the switched signal is exported from the video signal output terminal DATAOUT, thus completing the video switching. The content not described in detail in this description belongs to the prior art well-known to those skilled in the art.

[0023] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A video switch circuit, characterized in that: include: A voltage stabilizing integrated circuit MC7812, wherein the voltage stabilizing integrated circuit MC7812 is connected to a video signal input terminal DATAIN, and the voltage stabilizing integrated circuit MC7812 is connected in series with a switch K, and the output terminal of the voltage stabilizing integrated circuit MC7812 is connected to a digitally controlled analog switch, a voltage V, a resistor R, a resistor R2 and a resistor R1 are sequentially connected to one side of an outer wall of the digitally controlled analog switch, and a voltage V2, a voltage V1, a current L2, a current L and a current L1 are sequentially connected to the other side of an outer wall of the digitally controlled analog switch, the output terminal of the digitally controlled analog switch is connected to an output buffer, and the output buffer is connected to an enable disable module through 8 output lines, and the enable disable module is connected to a video signal output terminal DATAOUT.

2. A video switch circuit according to claim 1, characterized in that: The voltage of the signal input terminal DATAIN is 220V, and the voltage on both sides of the outer wall of the voltage stabilizing integrated circuit MC7812 is 16V.

3. A video switch circuit according to claim 1, characterized in that: The voltage V, the resistor R, the resistor R2 and the resistor R1 are connected in parallel, and the voltage V2, the voltage V1, the current L2, the current L and the current L1 are connected in parallel.

4. A video switch circuit according to claim 1, characterized in that: The resistance value of the circuit near the digital control analog switch is 3.3KΩ.

5. A video switch circuit according to claim 1, characterized in that: The current L1 and the current L2 are inlets, and the current L is an outlet.

6. A video switch circuit according to claim 1, characterized in that: The voltage V2 and the voltage V1 are inputs, and the voltage V is an output.

7. A video switch circuit according to claim 1, characterized in that: The resistor R is an outlet, and the resistor R2 and the resistor R1 are inlets.

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