Signal switching circuit and signal switcher

Abstract

The utility model discloses a signal switching circuit and a signal switcher, and relates to the technical field of signal transmission. The signal switching circuit comprises an audio and video processing chip, a first switching chip and a second switching chip, and the audio and video processing chip is connected with the input interface and the output interface; the first switching chip is connected with the input interface and the audio and video processing chip; the second switching chip is connected with the output interface and the audio and video processing chip. The audio and video signals are processed by the audio and video processing chip; the communication signal is switched to a processing interface corresponding to the audio and video processing chip based on the signal switching function of the first switching chip; after the audio and video processing chip processes the signal, the processed signal can be switched into a signal which can be matched with the output interface through the signal switching function of the second switching chip. Therefore, even on the premise that the formats of the input interface and the output interface are inconsistent, the signal switching circuit provided by the utility model can also realize a signal transmission function.

Description

Technical Field

[0001] The utility model relates to the technical field of signal transmission, in particular to a signal switching circuit and a signal switcher. Background Art

[0002] HDMI (High-Definition Multimedia Interface) and DP (DisplayPort) are two common high-definition digital video transmission interfaces, which are widely used in the field of signal transmission.

[0003] Nowadays, HDMI interface and DP interface are usually independent of each other. That is to say, when there is a need to transmit audio and video signals, HDMI interface or DP interface is usually selected according to the conditions of the input and output ends. For example, if both the input and output ends support HDMI, the HDMI interface can be selected. However, when the interface formats supported by the input and output ends are different, it is difficult to transmit data.

[0004] Therefore, under the premise that the formats of the input interface and the output interface of the signal transmission are inconsistent, how to realize the transmission of the signal is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The main purpose of the present application is to propose a signal switching circuit and a signal switch, aiming to solve the technical problem of how to realize signal transmission under the premise that the formats of the input interface and the output interface of the signal transmission are inconsistent.

[0006] In order to solve the above problems, the present application proposes a signal switching circuit, the signal switching circuit comprising:

[0007] An audio and video processing chip, wherein the audio and video processing chip is connected to the input interface and the output interface;

[0008] A first switching chip, the first switching chip is connected to the input interface and the audio and video processing chip;

[0009] A second switching chip is connected to the output interface and the audio and video processing chip.

[0010] In one embodiment, the signal switching circuit further includes:

[0011] An interface type detection module is connected to the audio and video processing chip, the input interface and the output interface.

[0012] In one embodiment, the interface type detection module includes:

[0013] A main control MCU is connected to the input interface, the output interface and the audio and video processing chip.

[0014] In one embodiment, the main control MCU is a N32G435CBL7 chip.

[0015] In one embodiment, the signal switching circuit further includes:

[0016] A power module is connected to the audio and video processing chip, the first switching chip and the second switching chip.

[0017] In one embodiment, the signal switching circuit further includes:

[0018] A first capacitor, wherein a first end of the first capacitor is connected to the input interface, and a second end of the first capacitor is connected to the audio and video processing chip.

[0019] In one embodiment, the signal switching circuit further includes:

[0020] A second capacitor, wherein a first end of the second capacitor is connected to the output interface, and a second end of the second capacitor is connected to the audio and video processing chip.

[0021] In one embodiment, the audio and video processing chip is a GSV6127X chip, and the first switching chip and the second switching chip are RS2233 chips.

[0022] In one embodiment, the input interface is an HDMI interface or a DP interface, and the output interface is an HDMI interface or a DP interface.

[0023] In addition, to solve the above problem, the present application also proposes a signal switch, wherein the signal switch includes the signal switching circuit as described above. The signal switching circuit includes:

[0024] An audio and video processing chip, wherein the audio and video processing chip is connected to the input interface and the output interface;

[0025] A first switching chip, the first switching chip is connected to the input interface and the audio and video processing chip;

[0026] A second switching chip is connected to the output interface and the audio and video processing chip.

[0027] The present application proposes a signal switching circuit, which includes an audio and video processing chip, a first switching chip and a second switching chip, wherein the audio and video processing chip is connected to an input interface and an output interface; the first switching chip is connected to the input interface and the audio and video processing chip; and the second switching chip is connected to the output interface and the audio and video processing chip.

[0028] In the signal switching circuit proposed in the present application, the audio and video signals that need to be transmitted can be processed by the audio and video processing chip; for the communication signals that need to be transmitted by the input interface, the communication signals connected to the input interface can be switched to the processing interface corresponding to the audio and video processing chip based on the signal switching function of the first switching chip; then, after the audio and video processing chip completes the processing of the communication signal and generates the processed signal, the processed signal can be switched to a signal that can be matched by the output interface through the signal switching function of the second switching chip. Therefore, even if the formats of the input interface and the output interface are inconsistent, the signal switching circuit proposed in the present application can also realize the function of signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 This is a schematic diagram of module connections of the first embodiment of the signal switching circuit of the present application;

[0031] Figure 2 This is a schematic diagram of module connections for an interface type detection function of an embodiment of a signal switching circuit of the present application;

[0032] Figure 3 This is a schematic diagram of module connections of another embodiment of the signal switching circuit of the present application;

[0033] Figure 4 This is a schematic diagram of the connection of the capacitively coupled modules of an embodiment of the signal switching circuit of the present application;

[0034] Figure 5 This is a module diagram of an embodiment of a signal switch of the present application.

[0035] Description of Figure Numbers:

[0036] 10, audio and video processing chip; 20, input interface; 30, output interface; 40, first switching chip; 50, second switching chip; 60, interface type detection module; 601, main control MCU; 70, power module; 80, first capacitor; 90, second capacitor.

[0037] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0041] Based on the above, the first embodiment of the signal switching circuit of the present application is proposed. Figure 1 , Figure 1 This is a schematic diagram of module connections of the first embodiment of the signal switching circuit of the present application.

[0042] In this embodiment, the signal switching circuit includes:

[0043] An audio and video processing chip 10, wherein the audio and video processing chip 10 is connected to the input interface 20 and the output interface 30;

[0044] A first switching chip 40, wherein the first switching chip 40 is connected to the input interface 20 and the audio and video processing chip 10;

[0045] The second switching chip 50 is connected to the output interface 30 and the audio and video processing chip 10 .

[0046] In one embodiment, the input interface 20 is an HDMI interface or a DP interface, and the output interface 30 is an HDMI interface or a DP interface.

[0047] It is understandable that the HDMI interface and the DP interface are mainly used to transmit digital audio and video signals. In order to facilitate the normal transmission of signals when the types of the output interface 30 and the input interface 20 are inconsistent, that is, when the input interface 20 is an HDMI interface and the output interface 30 is a DP interface, or when the input interface 20 is a DP interface and the output interface 30 is an HDMI interface, the present application proposes the above-mentioned signal switching circuit.

[0048] Of course, under the premise that the input interface 20 and the output interface 30 are of the same type, that is, the input interface 20 and the output interface 30 are both HDMI interfaces, or the input interface 20 and the output interface 30 are both DP interfaces, the signal switching circuit proposed in this application is also applicable.

[0049] Specifically, when the signal to be transmitted is a high-speed signal such as an audio and video signal, it can be processed only by an audio and video processing chip 10 such as a GSV6127X chip. That is, during transmission, the high-speed signal will pass through the input interface 20 (HDMI interface or DP interface), the audio and video processing chip 10 and the output interface 30 (HDMI interface or DP interface) in sequence. When the signal to be transmitted is a low-speed signal such as a communication signal, the low-speed signal will pass through the input interface 20 (HDMI interface or DP interface), the first switching chip 40, the audio and video processing chip 10, the second switching chip 50 and the output interface 30 (HDMI interface or DP interface) in sequence.

[0050] In a feasible implementation, for the circuit used to transmit low-speed signals, the audio and video processing chip 10 and the first switching chip 40 can be connected via signal lines such as DDC / HPD / 5V / CEC / AUX+ / AUX-. Similarly, the audio and video processing chip 10 and the second switching chip 50 can also be connected via signal lines such as DDC / HPD / 5V / CEC / AUX+ / AUX-.

[0051] Please refer to Figure 2 In a feasible implementation manner, the signal switching circuit further includes:

[0052] The interface type detection module 60 is connected to the audio and video processing chip 10 , the input interface 20 and the output interface 30 .

[0053] It is understandable that when the audio and video processing chip 10 has the function of interface type detection, then Figure 1 The module connection diagram given is used to construct the circuit. However, when the audio and video processing chip 10 does not have the function of interface type detection, hardware that can detect the input interface 20 and the output interface 30 is required. In this embodiment, the hardware is called the interface type detection module 60. Specifically, the interface type detection module 60 needs to be connected to the input interface 20 and the output interface 30 respectively. In order to facilitate the audio and video processing chip 10 to perform related signal processing according to the input interface 20 and the output interface 30, the interface type detection module 60 also needs to be connected to the audio and video processing chip 10.

[0054] In a feasible implementation manner, the interface type detection module 60 includes:

[0055] The main control MCU 601 is connected to the input interface 20 , the output interface 30 and the audio and video processing chip 10 .

[0056] Specifically, the main control MCU601 is a N32G435CBL7 chip.

[0057] It is understandable that the main control MCU 601 can detect the signal forms of the input interface 20 and the output interface 30, and then transmit the signal forms of the interfaces to the audio and video processing chip 10, so that the audio and video processing chip 10 processes according to the signal forms of the interfaces.

[0058] Specifically, the main control MCU 601 and the audio and video processing chip 10 can communicate through a serial communication protocol such as I2C (Inter-Integrated Circuit). Of course, in a feasible implementation, the communication between the main control MCU 601 and the audio and video processing chip 10 can also be established through other communication protocols, and this application does not limit this.

[0059] Please refer to Figure 3 In a feasible implementation manner, the signal switching circuit further includes:

[0060] A power module 70 is connected to the audio and video processing chip 10 , the first switching chip 40 and the second switching chip 50 .

[0061] It is understandable that the power module 70 is used to supply power to the audio and video processing chip 10, the first switching chip 40 and the second switching chip 50. Specifically, the power module 70 can be a battery or an external power source, which is not limited in the present application.

[0062] In a feasible implementation, the power module 70 can be one power supply or multiple power supplies. For example, when there is only one power supply in the circuit, the audio and video processing chip 10, the first switching chip 40 and the second switching chip 50 in the signal switching circuit can be powered by the power supply; when there are multiple power supplies in the circuit, the chips and the power supplies can be made to correspond one to one. For example, when there are three power supplies (power supply 1 to power supply 3) in the power module 70 in the signal switching circuit, the audio and video processing chip 10 can be connected to power supply 1, the first switching chip 40 can be connected to power supply 2, and the second switching chip 50 can be connected to power supply 3. It can be understood that when there are multiple power supplies in the signal switching circuit, since the first switching chip 40, the second switching chip 50 and the audio and video processing chip 10 and other electrical appliances are powered separately, the signal switching circuit will be more stable.

[0063] Please refer to Figure 4 In a feasible implementation manner, the signal switching circuit further includes:

[0064] A first capacitor 80 , wherein a first end of the first capacitor 80 is connected to the input interface 20 , and a second end of the first capacitor 80 is connected to the audio and video processing chip 10 .

[0065] In a feasible implementation manner, the signal switching circuit further includes:

[0066] A second capacitor 90 , wherein a first end of the second capacitor 90 is connected to the output interface 30 , and a second end of the second capacitor 90 is connected to the audio and video processing chip 10 .

[0067] It is understandable that high-speed signals such as audio and video signals usually carry a DC bias voltage, and the DC bias voltage may interfere with the signal processing process of the audio and video processing chip 10. Therefore, the present application further connects a first capacitor 80 between the input interface 20 and the audio and video processing chip 10, and the capacitive coupling circuit formed by the first capacitor 80 effectively removes the DC component in the audio and video signal, and only allows the AC signal to pass.

[0068] It is understandable that after the signal switching circuit proposed in the present application completes the conversion of the HDMI interface to the DP interface, or completes the conversion of the DP interface to the HDMI interface, the output interface 30 is usually connected to other devices that need to apply audio and video signals. In order to protect the devices that need to apply audio and video processing signals from being affected by the DC bias voltage, a second capacitor 90 can also be set between the audio and video processing chip 10 and the output interface 30.

[0069] In a feasible implementation, the input interface 20 or the output interface 30 may also be an integrated interface of an HDMI interface and a DP interface. That is, the input interface 20 and the output interface 30 may be HDMI / DP dual-mode interfaces. Specifically, since the structures of the HDMI interface and the DP interface are relatively similar. Therefore, after the HDMI interface and the DP interface are integrated into a dual-mode interface, the shrapnel built into the dual-mode interface can be used to distinguish whether the currently connected interface is an HDMI interface or a DP interface. Furthermore, the main control MCU 601 can obtain the interface type of access and output based on the shrapnel, thereby further improving the efficiency of signal switching.

[0070] When both the input interface 20 and the output interface 30 are dual-mode interfaces, the signal switching circuit proposed in the present application may include, in addition to the audio and video processing chip 10, the first switching chip 40, and the second switching chip 50, a dual-mode interface as the input interface 20, and a dual-mode interface as the output interface 30.

[0071] In one embodiment, the audio and video processing chip 10 is a GSV6127X chip, and the first switch chip 40 and the second switch chip 50 are RS2233 chips.

[0072] In the signal switching circuit proposed in the present application, the audio and video signals that need to be transmitted can be processed by the audio and video processing chip; for the communication signals that need to be transmitted by the input interface, the communication signals connected to the input interface can be switched to the processing interface corresponding to the audio and video processing chip based on the signal switching function of the first switching chip; then, after the audio and video processing chip completes the processing of the communication signal and generates the processed signal, the processed signal can be switched to a signal that can be matched by the output interface through the signal switching function of the second switching chip. Therefore, even if the formats of the input interface and the output interface are inconsistent, the signal switching circuit proposed in the present application can also realize the function of signal transmission.

[0073] Please refer to Figure 5 The present application also proposes a signal switch, which includes the signal switching circuit as described above.

[0074] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A signal switching circuit, characterized in that: The signal switching circuit comprises: An audio and video processing chip, wherein the audio and video processing chip is connected to the input interface and the output interface; A first switching chip, the first switching chip is connected to the input interface and the audio and video processing chip; A second switching chip is connected to the output interface and the audio and video processing chip.

2. The signal switching circuit according to claim 1, characterized in that: The signal switching circuit further includes: An interface type detection module is connected to the audio and video processing chip, the input interface and the output interface.

3. The signal switching circuit according to claim 2, characterized in that: The interface type detection module includes: A main control MCU is connected to the input interface, the output interface and the audio and video processing chip.

4. The signal switching circuit according to claim 3, characterized in that: The main control MCU is a N32G435CBL7 chip.

5. The signal switching circuit according to claim 1, wherein: The signal switching circuit further includes: A power module is connected to the audio and video processing chip, the first switching chip and the second switching chip.

6. The signal switching circuit according to claim 1, wherein: The signal switching circuit further includes: A first capacitor, wherein a first end of the first capacitor is connected to the input interface, and a second end of the first capacitor is connected to the audio and video processing chip.

7. The signal switching circuit according to claim 1, wherein: The signal switching circuit further includes: A second capacitor, wherein a first end of the second capacitor is connected to the output interface, and a second end of the second capacitor is connected to the audio and video processing chip.

8. The signal switching circuit according to claim 1, wherein: The audio and video processing chip is a GSV6127X chip, and the first switching chip and the second switching chip are RS2233 chips.

9. The signal switching circuit according to claim 1, wherein: The input interface is an HDMI interface or a DP interface, and the output interface is an HDMI interface or a DP interface.

10. A signal switch, characterized in that: The signal switch comprises the signal switching circuit according to any one of claims 1 to 9.

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