Split screen circuit

Abstract

The utility model relates to the field of video transmission, in particular to a split-screen circuit, which comprises a plurality of video input interfaces used for receiving video data provided by external equipment; the main control circuit is connected with the plurality of video input interfaces and is used for receiving video data from at least one video input interface; the decoding circuit is connected with the main control circuit and is used for analyzing the video data and obtaining a video signal and an audio signal; the plurality of video output interfaces are connected with the decoding circuit and are used for outputting video signals to the outside; the audio processing circuit is connected between the decoding circuit and the audio output interface and is used for converting the audio signal into an audio analog signal and outputting the audio analog signal through the audio output interface; and the switching circuit is connected with the main control circuit and is used for outputting a mode selection signal to the main control circuit. The split-screen circuit can output video signals and audio signals at the same time, the switching circuit is arranged, the problem that an existing split-screen circuit is single in function can be solved, and display diversity is achieved.

Description

Technical Field

[0001] The utility model relates to the field of video data transmission, and more particularly to a split-screen circuit. Background Art

[0002] High Definition Multimedia Interface (HDMI) is a fully digital video and audio transmission interface that can transmit uncompressed audio and video signals. To meet the needs of different aspects such as life, work, and entertainment, a variety of split-screen devices have emerged in the current market. Through split-screen devices, a single video data can be displayed on multiple display devices simultaneously, and multiple videos input from different host devices can be displayed on the same display device. However, split-screen devices on the current market often only support one of the above functions, and their display functions and application scenarios are severely limited. At the same time, when using existing split-screen devices, an additional audio processing device is often required. Due to different devices from different manufacturers, this often causes the video and audio to be out of sync in actual display, affecting the audio-visual effect and experience.

[0003] The above problems have become urgent problems to be solved. Summary of the Utility Model

[0004] The utility model discloses a split-screen circuit that is compatible with audio output function and video output function, and realizes multiple display modules through a switching circuit to improve the problems of single function and poor audio-visual effect of existing split-screen devices.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] Based on the above purpose, the utility model discloses a split-screen circuit, including:

[0007] Multiple video input interfaces for receiving video data provided by external devices;

[0008] A main control circuit connected to the multiple video input interfaces to receive video data from at least one video input interface based on a mode selection signal;

[0009] A decoding circuit connected to the main control circuit for parsing the video data to obtain a video signal and an audio signal;

[0010] Multiple video output interfaces connected to the decoding circuit to output the video signal externally;

[0011] An audio processing circuit connected between the decoding circuit and the audio output interface for converting the audio signal into an audio analog signal and outputting it externally through the audio output interface;

[0012] The switching circuit is connected to the main control circuit to output a mode selection signal to the main control circuit.

[0013] Preferably, the decoding circuit includes: a video parsing module and a video copying module;

[0014] The video parsing module is electrically connected to the main control circuit and is used for parsing video data to obtain a video signal and an audio signal;

[0015] The video copying module is connected to the video parsing module and is used for copying out M video signals and outputting them externally through M video output interfaces respectively; where M is an integer greater than or equal to 2.

[0016] Preferably, the decoding circuit further includes: a video integration module;

[0017] The video integration module is connected between the video parsing module and multiple video output interfaces and is used for receiving and integrating multiple video signals and outputting them through at least one video output interface.

[0018] Preferably, the decoding circuit further includes: an enabling module;

[0019] The enabling module is connected to the video parsing module, the video copying module, and the video integration module and is used for controlling the working modes of the video parsing module, the video copying module, and the video integration module according to the mode selection signal.

[0020] Preferably, the switching circuit includes a resistor string formed by N resistors connected in series, a selector, and an analog-to-digital conversion module;

[0021] The resistor string includes N voltage-dividing nodes;

[0022] The selector includes N input terminals, a selection terminal, and an output terminal. The N input terminals are electrically connected to the N voltage-dividing nodes in one-to-one correspondence. The selection terminal is used for receiving a selection signal, and the output terminal is used for selecting the divided voltage of one voltage-dividing node and outputting it according to the selection signal;

[0023] The analog-to-digital conversion module is connected between the selector and the main control circuit and is used for converting the divided voltage into a digital signal.

[0024] Preferably, the multi-screen circuit further includes: three USB2.0 interfaces and one USB3.0 interface.

[0025] Preferably, the multi-screen circuit further includes a power supply circuit;

[0026] The power supply circuit is used for converting a first DC voltage into a second DC voltage suitable for the multi-screen circuit to supply power to the multi-screen circuit.

[0027] Preferably, the split-screen circuit further includes a plurality of LED display circuits connected to the main control circuit;

[0028] Each LED display circuit includes a series-connected LED lamp bead and a resistor.

[0029] Preferably, the split-screen circuit further includes an electrostatic suppression circuit;

[0030] The electrostatic suppression circuit is connected between the main control circuit and the decoding circuit and is used to discharge static electricity to protect the split-screen circuit.

[0031] Preferably, the split-screen circuit further includes a plurality of video input interfaces and / or a plurality of video output interfaces that are HDMI interfaces.

[0032] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows:

[0033] An embodiment of the present utility model provides a split-screen circuit, including: a plurality of video input interfaces for receiving video data provided by an external device; a main control circuit connected to the plurality of video input interfaces for receiving video data from at least one video input interface; a decoding circuit connected to the main control circuit for parsing the video data to obtain a video signal and an audio signal; a plurality of video output interfaces connected to the decoding circuit for externally outputting the video signal; an audio processing circuit connected between the decoding circuit and the audio output interface for converting the audio signal into an audio analog signal and externally outputting it through the audio output interface; a switching circuit connected to the main control circuit for outputting a mode selection signal to the main control circuit. The split-screen circuit of the present utility model can output a video signal and an audio signal simultaneously, and is equipped with a switching circuit, which can solve the problem of the single function of the existing split-screen circuit, realize display diversity, and improve the audio-visual effect at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Shows a schematic diagram of a split-screen circuit disclosed in an embodiment of the present utility model Figure 1 ;

[0035] Figure 2 Shows a schematic diagram of a split-screen circuit disclosed in an embodiment of the present utility model Figure 2 ;

[0036] Figure 3 Shows a schematic diagram of a decoding circuit disclosed in an embodiment of the present utility model Figure 1 ;

[0037] Figure 4 Shows a schematic diagram of a decoding circuit disclosed in an embodiment of the present utility model Figure 2 ;

[0038] Figure 5Shows a schematic diagram of a switching circuit disclosed in an embodiment of the present utility model;

[0039] Figure 6 Shows the schematic of a split - screen circuit disclosed in an embodiment of the present utility model Figure 3 ;

[0040] Figure 7 Shows a schematic diagram of an LED display circuit disclosed in an embodiment of the present utility model;

[0041] Figure 8 Shows a schematic diagram of an electrostatic suppression circuit disclosed in an embodiment of the present utility model;

[0042] 300 - Split - screen circuit, 10 - Main control circuit, 20 - Decoding circuit, 201 - Video parsing module, 202 - Video copying module, 203 - Video integration module, 204 - Enable module, 30 - Video input interface, 40 - Video output interface, 50 - Audio processing circuit, 60 - Switching circuit, 601 - Resistor string, 602 - Selector, 603 - Analog - to - digital conversion module, 70 - Audio output interface, 80 - USB interface, 90 - Electrostatic suppression circuit, 100 - Power supply circuit, 110 - LED display circuit. Specific embodiments

[0043] The following further describes the present utility model in detail through specific embodiments and in conjunction with the accompanying drawings.

[0044] Embodiment:

[0045] Refer to Figure 1 , an embodiment of the present utility model discloses a split - screen circuit 300, which includes a main control circuit 10, a decoding circuit 20, a plurality of video input interfaces 30, a plurality of video output interfaces 40, an audio processing circuit 50, a switching circuit 60, and an audio output interface 70; the plurality of video input interfaces 30 are used to receive video data provided by external devices; the main control circuit 10 is connected to the plurality of video input interfaces 30 to receive video data from at least one video input interface 30 based on a mode selection signal; the decoding circuit 20 is connected to the main control circuit 10 and is used to parse the video data to obtain a video signal and an audio signal; the plurality of video output interfaces 40 are connected to the decoding circuit 20 to output the video signal externally; the audio processing circuit 50 is connected between the decoding circuit 20 and the audio output interface 70 and is used to convert the audio signal into an audio analog signal and output it externally through the audio output interface 70; the switching circuit 60 is connected to the main control circuit 10 to output a mode selection signal to the main control circuit.

[0046] In the present utility model, the main control circuit 10 undertakes functions such as controlling the power on / off of the split screen circuit 300, switching and implementing working modes. It can determine which video input interface data to receive according to the mode selection signal, and coordinate the decoding circuit to perform corresponding processing on the received video data. That is, the main control circuit is not only a manager but also a bridge for communication between the external and the decoding circuit.

[0047] Specifically, each video input interface 30 can be connected to an external device to receive the video data expected to be displayed by the external device. Here, the external device can be a computer host, an IPAD, a server, etc. The main control circuit 10 can select to receive the video data that needs to be displayed in the current mode according to the mode selection signal. For example, only receive the video data of the external device 1 through the video input interface 1, or receive the video data of the external device 1 and the external device 2 through the video input interface 1 and the video input interface 2 respectively. That is to say, the main control device does not need to receive the video data of all external devices connected to all video input interfaces 30, but only receives the video data that needs to be displayed, which is beneficial to reducing the storage requirements of the system and further improving the processing speed of the main control circuit.

[0048] The decoding circuit 20 is connected to the main control circuit 10 and is used for parsing the video data to obtain video signals and audio signals. It can be understood that the decoding circuit 20 is used to parse the video data transmitted by the main control circuit 10 into video signals and audio signals, and then output them through the corresponding output interfaces respectively. It should be noted here that due to the function of the decoding circuit 20, the output video signals and audio signals are synchronized. Therefore, in actual display, there will be no problem of out-of-sync audio and video. In addition, in general applications, the video data is not directly output after decoding, but also needs to be processed according to the specific mode, such as video parsing, video splicing, video copying, video selection, video integration, etc. The present utility model will elaborate on this in the following text.

[0049] Exemplarily, the connection mode between the audio output interface 70 and the external audio playback device can be wired or wireless.

[0050] It should be noted that there are multiple video output interfaces for connecting external display devices, such as display screens, televisions, projectors and other devices with display functions. According to the mode selection signal, it can be controlled which video output interfaces are used to output the video to the display device.

[0051] For example, if the mode is one split into two, the video of the external host 1 is copied into two parts, and each part is output through a display device. That is to say, the two display devices will simultaneously display the video of the external host 1.

[0052] For another example, if the mode is one split into three, correspondingly, the three display devices will simultaneously display the video of the external host 1.

[0053] For yet another example, if the mode is one out of three and only displayed on display screen 1 (host A is selected for display), then only display screen 1 will display the data of host A.

[0054] Refer to Figure 2 , in this embodiment, the decoding circuit 20 includes a video parsing module 201 and a video copying module 202;

[0055] The video parsing module 201 is electrically connected to the main control circuit 10 and is used to parse the video data received and transmitted by the main control circuit 10 to obtain a video signal and an audio signal;

[0056] The video copying module 202 is connected to the video parsing module 201 and is used to copy the video signal and output the copied video signals respectively through a plurality of video output interfaces 40. That is to say, the video copying module 202 copies one video signal into M video signals and outputs them respectively through M video output interfaces; where M is an integer greater than or equal to 2.

[0057] For example, when the mode is one split into two, the external device inputs video data from one video input interface 30 to the main control circuit 10 and the decoding circuit 20. The video parsing module in the decoding circuit will parse the video to separate the video signal and the audio signal; among them, the audio signal is processed by the audio processing circuit 50 and then transmitted to the external audio playback device through the audio output interface 70; the video signal passes through the video copying module 202 to copy one video data into multiple video data (two in this case), and transmits them to a plurality of video output interfaces 40 (two in this case) for display by two external display devices. It should be noted that the number of copies of the video copying is the same as the number of the video output interfaces 40. This application is currently common in multimedia conferences.

[0058] Refer to Figure 3 , in this embodiment, the decoding circuit 20 further includes a video integration module 203;

[0059] The video integration module 203 is connected between the video parsing module 201 and a plurality of video output interfaces 40 and is used to receive and integrate multiple video signals and output them through at least one video output interface 40.

[0060] The video integration module 203 integrates the multiple video data received by the main control circuit 10 from multiple video input interfaces 30 and outputs the integrated video data through at least one video output interface, thereby realizing the function of displaying multiple video data pictures on the same display interface. Among them, the number of integrated video data and which display devices will display the integrated video are determined by the mode selection signal. This application is currently commonly used in multi-video-end monitoring displays, such as security monitoring.

[0061] See Figure 4 , in this embodiment, the decoding circuit 20 further includes an enable module 204. The enable module 204 is connected to the video parsing module 201, the video copying module 202, and the video integration module 203, and is used to control the working modes of the video parsing module 201, the video copying module 202, and the video integration module 203 according to the mode selection signal received by the main control circuit 10.

[0062] It can be understood that the main control circuit 10 outputs an enable signal according to the mode selection signal, so that the enable module 204 controls one of the video parsing module 201, the video copying module 202, and the video integration module 203 to execute the function corresponding to the mode selection signal.

[0063] Specifically, first enable the video parsing module 201 to perform video parsing. If the mode selection signal corresponds to the copying function, then enable the video copying module 202 to execute copying. If the mode selection signal corresponds to the integration function, then enable the video integration module 203 to integrate multiple videos. If the mode selection signal corresponds to the selection function (such as selecting the video output of a certain external device), then after the video parsing module 201 parses out the video signal, it is directly output by one or some output interfaces.

[0064] Refer to Figure 5 , in this embodiment, the switching circuit 60 includes a resistor string 601 composed of N resistors connected in series, a selector 602, and an analog-to-digital conversion module 603;

[0065] The resistor string 61 includes N voltage dividing nodes;

[0066] The selector 602 includes N input terminals, a selection terminal, and an output terminal. The N input terminals are electrically connected to the N voltage dividing nodes in one-to-one correspondence. The selection terminal is used to receive the selection signal, and the output terminal is used to select and output the divided voltage of one voltage dividing node according to the selection signal;

[0067] The analog-to-digital conversion module 603 is connected between the selector 602 and the main control circuit 10, and is used to convert the divided voltage into a digital signal, and this digital signal is the mode selection signal.

[0068] It can be understood that the voltage dividing node can be the connection point between two resistors, and such asFigure 5 The connection point of R1 and the power supply voltage VDD, and the connection point between R N and ground. The selector MUX is controlled by the selection signal SEL to select the voltage of one of the voltage division nodes and output it to the analog-to-digital conversion module 603, so that the main control circuit 10 can identify the mode selected by the user. The analog-to-digital conversion module 603 is a common conversion circuit, which will not be elaborated in this application.

[0069] Exemplarily, the resistance values of the N resistors are the same, that is, R1 = R2 =... = R N-1 = R N .

[0070] It should be noted that here, the selection signal SEL can be obtained through an external button of the split screen device. In addition, the switching circuit does not necessarily adopt the form of the above-mentioned resistor string, and can also adopt the form of an adjustable resistor.

[0071] Referring to Figure 6 , in this embodiment, the split screen circuit 300 further includes three USB2.0 interfaces 80 and one USB3.0 interface 80.

[0072] The USB interface 80 can be used to charge external devices or connect to external control devices; the external control devices can be keyboards, mice, printers, storage devices (such as USB flash drives, hard disks), etc.

[0073] In this embodiment, the split screen circuit 300 further includes a power supply circuit 100;

[0074] The power supply circuit 100 is used to convert the first DC voltage into a second DC voltage suitable for the split screen circuit 300 to supply power to the split screen circuit 300. For example, it steps down the 19V DC voltage to 5V DC.

[0075] Referring to Figure 7 , in this embodiment, the split screen circuit 300 further includes a plurality of LED display circuits 110 connected to the main control circuit 10; each LED display circuit includes a series-connected LED lamp bead and a resistor.

[0076] The display circuit 110 can be used to indicate a certain special or designated situation, such as the power supply situation, system failure situation, working mode type, etc.

[0077] Referring to Figure 8 , in this embodiment, the split screen circuit 300 further includes an electrostatic suppression circuit 90;

[0078] The electrostatic suppression circuit 90 is connected between the main control circuit 10 and the decoding circuit 20 and is used to discharge static electricity to protect the normal operation of the split screen circuit 300.

[0079] Preferably, in the present utility model, multiple video input interfaces and / or multiple video output interfaces of the split-screen circuit 300 are HDMI interfaces; the HDMI interface is a High-Definition Multimedia Interface, which is a high-definition and lossless transmission channel for video data and can be set as an HDMI input end and an HDMI output end.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0081] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present application will not separately describe various possible combination manners.

Claims

1. A split-screen circuit, characterized in that, Comprising: A plurality of video input interfaces for receiving video data provided by an external device; A main control circuit connected to the plurality of video input interfaces to receive video data from at least one video input interface based on a mode selection signal; A decoding circuit connected to the main control circuit for parsing the video data to obtain a video signal and an audio signal; A plurality of video output interfaces connected to the decoding circuit to output the video signal externally; An audio processing circuit connected between the decoding circuit and an audio output interface for converting the audio signal into an analog audio signal and outputting it externally through the audio output interface; A switching circuit connected to the main control circuit to output a mode selection signal to the main control circuit.

2. The split-screen circuit according to claim 1, wherein, The decoding circuit includes: a video parsing module, a video copying module; The video parsing module is connected to the main control circuit for parsing the video data to obtain a video signal and an audio signal; The video copying module is connected to the video parsing module for copying out M video signals and outputting them externally through M video output interfaces respectively; where M is an integer greater than or equal to 2.

3. The split-screen circuit according to claim 2, characterized in that, The decoding circuit further includes: a video integration module; The video integration module is connected between the video parsing module and the plurality of video output interfaces for receiving and integrating a plurality of video signals and outputting them through at least one of the video output interfaces.

4. The split-screen circuit according to claim 3, characterized in that, The decoding circuit further includes: an enabling module; The enabling module is connected to the video parsing module, the video copying module and the video integration module for controlling the working modes of the video parsing module, the video copying module and the video integration module according to the mode selection signal.

5. The split-screen circuit according to claim 4, characterized in that, The switching circuit includes a resistor string composed of N resistors connected in series, a selector and an analog-to-digital conversion module; The resistor string includes N voltage dividing nodes; The selector includes N input terminals, a selection terminal and an output terminal. The N input terminals are electrically connected to the N voltage dividing nodes in one-to-one correspondence. The selection terminal is used for receiving a selection signal, and the output terminal is used for selecting and outputting the divided voltage of one voltage dividing node according to the selection signal; The analog-to-digital conversion module is connected between the selector and the main control circuit for converting the divided voltage into a digital signal.

6. The split-screen circuit according to claim 1, wherein The multi-screen circuit further includes: three USB2.0 interfaces and one USB3.0 interface.

7. The split-screen circuit according to claim 1, characterized in that, The multi-screen circuit further includes a power supply circuit; The power supply circuit is used for converting a first DC voltage into a second DC voltage suitable for the multi-screen circuit to supply power to the multi-screen circuit.

8. A split-screen circuit according to claim 1, wherein Also comprising: A plurality of LED display circuits connected to the main control circuit; Each LED display circuit includes a series-connected LED lamp bead and a resistor.

9. The split-screen circuit according to claim 1, wherein The multi-screen circuit further includes: an electrostatic suppression circuit; The electrostatic suppression circuit is connected between the main control circuit and the decoding circuit for discharging static electricity to protect the multi-screen circuit.

10. A split-screen circuit according to any one of claims 1-9, characterized in that The plurality of video input interfaces and / or the plurality of video output interfaces are HDMI interfaces.

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