Crosstalk suppression method and crosstalk suppression system

Abstract

The invention discloses a crosstalk suppression method and a crosstalk suppression system, and belongs to the field of spliced screens. The method comprises the following steps: under the condition that a first port of first spliced screen equipment is connected with a controller and a second port of the first spliced screen equipment is connected with second spliced screen equipment, the first spliced screen equipment determines a target SNR of the second port in a receiving direction; when the target SNR is greater than an SNR threshold value, the first spliced screen device sends first information to the second spliced screen device through the second port; wherein the first information is used for indicating the second spliced screen equipment to reduce the energy of the signal output to the second port. The present application is used for suppressing cross-port crosstalk.

Description

Technical Field

[0001] The present application belongs to the field of splicing screens, and specifically relates to a method for suppressing crosstalk and a system for suppressing crosstalk. Background Art

[0002] In the splicing screen application, many small screens of splicing screen devices are spliced ​​into a large screen. Each splicing screen device is directly or indirectly connected to a controller, and adjacent splicing screen devices are connected via network cables.

[0003] In the related art, adjacent splicing screen devices are closely adjacent to each other, such as Figure 1 As shown, the length of the network cable between adjacent splicing screen devices is relatively short (for example, generally less than 1 meter). The screen image of the splicing screen device is output by the controller, which may be in a remote control room. The controller and the splicing screen device are connected by a longer network cable (for example, a network cable greater than 100 meters). The data of the entire screen is sent by the controller and gradually passes through the splicing screen devices 1, 2, 3... The stable transmission of the entire link is the basis for the stable display of the splicing screen image.

[0004] However, in Figure 1 In this typical application, cross-port crosstalk is an important factor affecting transmission stability. The physical layer chips inside the splicing screen device often share transformers, which will introduce serious cross-port crosstalk problems. Specifically, taking the splicing screen device 1 as an example, port A of the splicing screen device 1 and the controller are connected through a very long network cable (for example, a network cable of more than 100 meters), and the signal quality is poor. Port A of the splicing screen device 1 is also interfered by the far-end crosstalk from the splicing screen device 2. The splicing screen device 1 and the splicing screen device 2 are connected using a shorter network cable (for example, a network cable of about 1m), and the signal attenuation is small, so the cross-port far-end crosstalk will seriously affect port A of the splicing screen device 1. Summary of the invention

[0005] The embodiments of the present application provide a method and a system for suppressing crosstalk, which can solve the problem that cross-port crosstalk affects transmission stability in the related art.

[0006] In a first aspect, an embodiment of the present application provides a method for suppressing crosstalk, the method comprising: When the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device, the first splicing screen device determines a target signal-to-noise ratio (SNR) of the second port in a receiving direction; When the target SNR is greater than the SNR threshold, the first splicing screen device sends the first information to the second splicing screen device via the second port; The first information is used to instruct the second splicing screen device to reduce the energy of the signal output to the second port.

[0007] In a second aspect, an embodiment of the present application provides a method for suppressing crosstalk, the method comprising: The second splicing screen device receives first information transmitted via the second port of the first splicing screen device, where the first information is used to instruct the second splicing screen device to reduce the energy of a signal output to the second port; The second splicing screen device reduces the energy of the signal output to the second port based on the first information; Among them, the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device.

[0008] In a third aspect, an embodiment of the present application provides a system for suppressing crosstalk, including a first splicing screen device, a second splicing screen device and a controller, wherein a first port of the first splicing screen device is connected to the controller and a second port of the first splicing screen device is connected to the second splicing screen device; wherein: The first splicing screen device is used to determine a target SNR of the second port in a receiving direction; when the target SNR is greater than an SNR threshold, the first information is sent to the second splicing screen device via the second port; wherein the first information is used to instruct the second splicing screen device to reduce the energy of the signal output to the second port; The second splicing screen device is used to receive first information transmitted via the second port of the first splicing screen device; based on the first information, reduce the energy of the signal output to the second port.

[0009] At least one of the above technical solutions provided in the embodiments of the present application can achieve the following technical effects: In an embodiment of the present application, when the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device, the first splicing screen device determines the target SNR of the second port in the receiving direction; when the target SNR is greater than the SNR threshold, the first splicing screen device sends first information to the second splicing screen device via the second port; wherein the first information is used to instruct the second splicing screen device to reduce the energy of the signal output to the second port. In this way, the first splicing screen device instructs the second splicing screen device to reduce the energy of the signal output to the second port through the first information, which can reduce the cross-port crosstalk from the second splicing screen device to the first port of the first splicing screen device (i.e., the port connected to the controller), and thus can solve the problem of related art cross-port crosstalk affecting transmission stability to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0011] Figure 1 It is a schematic diagram of the deployment environment of multiple splicing screen devices and controllers; Figure 2 is a flow chart of a method for suppressing crosstalk provided by an embodiment of the present application; Figure 3 is a flow chart of another method for suppressing crosstalk provided by an embodiment of the present application; Figure 4 is a flow chart of another method for suppressing crosstalk provided by an embodiment of the present application; Figure 5 is a flow chart of another method for suppressing crosstalk provided by an embodiment of the present application; Figure 6 is a flow chart of another method for suppressing crosstalk provided by an embodiment of the present application; Figure 7 is a specific flow chart of a method for suppressing crosstalk provided in an embodiment of the present application; Figure 8 is a schematic diagram of the internal structure of a spliced ​​screen device provided in an embodiment of the present application; Figure 9-1 is a schematic diagram of the internal structure of another splicing screen device provided in an embodiment of the present application; Figure 9-2 is a schematic diagram of the internal structure of an integrated physical layer chip provided in an embodiment of the present application; Fig.10 It is a structural block diagram of a system for suppressing crosstalk provided in an embodiment of the present application. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0013] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] like Figure 1 As shown, Figure 1 The splicing screen device 1 and the splicing screen device Y in the embodiment of the present application will have cross-port crosstalk. In particular, the method for suppressing crosstalk provided in the embodiment of the present application can suppress Figure 1 The crosstalk on the port connected to the controller on the splicing screen device 1 can be suppressed Figure 1 Crosstalk on the port connected to the controller on the splicing screen device Y.

[0016] The method for suppressing crosstalk provided in the embodiment of the present application can be applied to the case of a spliced ​​screen. The method for suppressing crosstalk provided in the embodiment of the present application can be performed by an electronic device, and the electronic device can be a spliced ​​screen device.

[0017] The method for suppressing crosstalk provided by the embodiment of the present application is described in detail below through specific embodiments and application scenarios in conjunction with the accompanying drawings.

[0018] Figure 2 is a flow chart of a method for suppressing crosstalk provided by an embodiment of the present application. Figure 1 , the method for suppressing crosstalk provided by the embodiment of the present application may include: Step 210, when the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device, the first splicing screen device determines a target SNR of the second port in a receiving direction; The splicing screen device (including the first splicing screen device and the second splicing screen device) in the embodiment of the present application has multiple ports, which can be network ports for connecting network cables. Different splicing screen devices can be connected through ports. The splicing screen device can have a display screen. The display screens of each splicing screen device can be spliced ​​together to form a larger display screen. The controller is used to output display images to each splicing screen device.

[0019] ‌SNR (Signal to Noise Ratio) is the ratio of the strength of the received useful signal to the strength of the received interference signal (noise and interference). That is, the SNR in the embodiment of the present application can be the Signal to Interference plus Noise Ratio (SINR). The definition of the signal-to-noise ratio (SNR) is the ratio of the signal power to the noise power, usually expressed in decibels (dB).

[0020] The signal-to-noise ratio is very important in electronic devices and is used to measure the signal quality of a device or system. The higher the signal-to-noise ratio, the better the signal quality and the higher the reliability of information transmission.

[0021] Step 220: When the target SNR is greater than the SNR threshold, the first splicing screen device sends first information to the second splicing screen device via the second port; wherein the first information is used to instruct the second splicing screen device to reduce the energy of the signal output to the second port.

[0022] In an embodiment of the present application, the SNR threshold may be a threshold associated with an SNR margin (SNR Margin), for example, the determined SNR threshold may ensure a large SNR margin, wherein the SNR margin meeting the bit error rate requirement may be regarded as a large SNR margin. The SNR margin is the difference between the actual SNR obtained and the minimum SNR required by the system. In a communication system, the SNR margin is an important parameter to ensure signal quality, which indicates the ability of a signal to resist noise interference during transmission. The larger the SNR margin, the better the signal quality and the higher the transmission reliability.

[0023] In an embodiment of the present application, the SNR threshold value may be obtained based on the SNR margin. More specifically, the SNR threshold value may be obtained based on the SNR margin and the required minimum SNR. In one embodiment, the sum of the required minimum SNR and the preset SNR margin may be used as the SNR threshold value. Among them, the preset SNR margin may be set as needed, for example, the SNR margin matching the current communication environment may be determined based on the current communication environment. In this way, once the target SNR is greater than the SNR threshold value, it can be determined that the current SNR margin is large.

[0024] The SNR threshold is greater than the required minimum SNR. In the embodiment of the present application, the SNR threshold can be determined directly based on the required minimum SNR, for example, a specified value is added to the required minimum SNR as the SNR threshold.

[0025] In the embodiment of the present application, the target SNR being greater than the SNR threshold may indicate that the signal quality of the second port of the first splicing screen device in the receiving direction is good. Figure 1 In the application environment shown, the target SNR being greater than the SNR threshold may indicate that the signal quality transmitted from the second splicing screen device to the second port of the first splicing screen device is good. At this time, the signal transmitted from the second splicing screen device to the second port of the first splicing screen device will cause crosstalk to the signal transmitted from the first splicing screen device via the first port, i.e., cross-port crosstalk. The stronger the signal transmitted from the second splicing screen device to the second port of the first splicing screen device, the stronger the crosstalk to the signal transmitted from the first splicing screen device via the first port. In the case where the signal transmitted from the second splicing screen device to the second port of the first splicing screen device is weakened, the crosstalk of the signal transmitted from the second splicing screen device to the second port of the first splicing screen device to the signal transmitted from the first splicing screen device via the first port will also be weakened.

[0026] In an embodiment of the present application, the second splicing screen device reducing the energy of the signal output to the second port may include the second splicing screen device reducing the intensity of the signal output to the second port. Specifically, at least one of reducing the amplitude of the signal output to the second port and reducing the voltage conversion rate of the signal output to the second port may be selected.

[0027] In the method for suppressing crosstalk provided in an embodiment of the present application, when the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device, the first splicing screen device determines the target SNR of the second port in the receiving direction; when the target SNR is greater than the SNR threshold, the first splicing screen device sends first information to the second splicing screen device via the second port; wherein the first information is used to instruct the second splicing screen device to reduce the energy of the signal output to the second port. In this way, the first splicing screen device instructs the second splicing screen device to reduce the energy of the signal output to the second port through the first information, which can reduce the cross-port crosstalk from the second splicing screen device to the first port of the first splicing screen device (i.e., the port connected to the controller), and thus can solve the problem of related cross-port crosstalk affecting transmission stability to a certain extent.

[0028] Figure 3 is a flow chart of a method for suppressing crosstalk provided by an embodiment of the present application. Figure 3, the method for suppressing crosstalk provided by the embodiment of the present application may include: Step 310: When the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device, the first splicing screen device determines a target SNR of the second port in a receiving direction; Step 320: When the target SNR is greater than the SNR threshold, the first splicing screen device sends first information to the second splicing screen device via the second port; wherein the first information is used to instruct the second splicing screen device to reduce the energy of the signal output to the second port; Step 330: the first splicing screen device receives second information sent by the second splicing screen device via the second port, where the second information is used to instruct the first splicing screen device to reduce energy of a signal output via the second port; In the embodiments of the present application, Figure 1 As shown, the first port of the first splicing screen device (i.e., the port connected to the controller) is not only subject to cross-port crosstalk (i.e., far-end cross-port crosstalk) from the second splicing screen device, but may also be subject to cross-port crosstalk (i.e., near-end cross-port crosstalk) from the second port of the first splicing screen device. In view of this, in an embodiment of the present application, after receiving the first information, the second splicing screen device may send second information to the second port of the first splicing screen device, and the second information is used to instruct the first splicing screen device to reduce the energy of the signal output via the second port. In this way, the first splicing screen device can receive the second information sent by the second splicing screen device via the second port.

[0029] Step 340: the first splicing screen device reduces the energy of the signal output via the second port based on the second information.

[0030] Wherein, reducing the energy of the signal output via the second port in step 340 includes: reducing the strength of the signal output via the second port. Specifically, at least one of reducing the amplitude of the signal output via the second port and reducing the voltage conversion rate of the signal output via the second port may be selected.

[0031] In the embodiment of the present application, the first splicing screen device instructs the second splicing screen device to reduce the energy of the signal output to the second port through the first information, which can reduce the cross-port crosstalk from the second splicing screen device to the first port (i.e., the port connected to the controller) of the first splicing screen device, and thus can solve the problem of related art cross-port crosstalk affecting transmission stability to a certain extent. In addition, based on the second information, the first splicing screen device reduces the energy of the signal output via the second port, which can reduce the cross-port crosstalk from the second port of the first splicing screen device to the first port (i.e., the port connected to the controller), so that while reducing the cross-port far-end crosstalk, the cross-port near-end crosstalk is also reduced, which can further solve the problem of related art cross-port crosstalk affecting transmission stability.

[0032] Figure 2 and Figure 3 The specific process of the method for suppressing crosstalk when the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device is discussed. In the embodiment of the present application, before determining the target SNR, the first splicing screen device and the second splicing screen device can start the auto-negotiation process. Auto-negotiation can be achieved through a signal called Fast Link Pulse (FLP). The two parties in the auto-negotiation exchange information through FLP. The information exchanged during the auto-negotiation phase may include master-slave (M / S) information, half-duplex / full-duplex information, etc. In the embodiment of the present application, it can be determined that the first port of the first splicing screen device is connected to the controller, and the second port of the first splicing screen device is connected to the second splicing screen device through the interactive information in the auto-negotiation phase. Now in combination with Figure 4 Provide further explanation.

[0033] Figure 4 is a flow chart of a method for suppressing crosstalk provided by an embodiment of the present application. Figure 4 , the method for suppressing crosstalk provided by the embodiment of the present application may include: Step 410, the first splicing screen device obtains first negotiation information obtained via the first port and second negotiation information obtained via the second port in the self-negotiation stage; In the self-negotiation stage, the first splicing screen device and the connected device will exchange information. The first negotiation information may be information sent by the device connected to the first port of the first splicing screen device. The second negotiation information may be information sent by the device connected to the second port of the first splicing screen device.

[0034] In the embodiment of the present application, the first negotiation information and the second negotiation information may be page (PAGE) information, such as information of the first page (PAGE1).

[0035] Step 420: The first splicing screen device determines that the device connected to the first port is a controller based on the first negotiation information; In an embodiment of the present application, a target identifier may be used to indicate the device type. The device type may include a splicing screen device and a controller. For example, a first target identifier indicating the controller type may be included in the negotiation information. If the first splicing screen device obtains the first target identifier, it can be known that the controller is connected, and if the first splicing screen device does not obtain the first target identifier, it can be known that the splicing screen device is connected. For another example, a second target identifier indicating the type of the splicing screen device may be included in the negotiation information. If the first splicing screen device obtains the second target identifier, it can be known that the controller is not connected, but the splicing screen device; if the first splicing screen device does not obtain the second target identifier, it can be known that the controller is connected. Of course, the first target identifier and the second target identifier can also be used at the same time. In this case, if the first splicing screen device obtains the first target identifier, it can be known that the controller is connected, and if the first splicing screen device obtains the second target identifier, it can be known that the splicing screen device is connected. If the first splicing screen device does not obtain the first target identifier or the second target identifier, it can be known that the unknown device is connected.

[0036] The first negotiation information in step 420 may include a first target identifier, and the first target identifier indicates that the device connected to the first port of the first splicing screen device is a controller.

[0037] Step 430: the first splicing screen device determines, based on the second negotiation information, that the device connected to the second port is a device other than the controller; The second negotiation information in step 420 may include a second target identifier, and the second target identifier indicates that the device connected to the second port of the first splicing screen device is a device other than the controller.

[0038] In the embodiment of the present application, the device other than the controller may be a splicing screen device.

[0039] Step 440: When the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device, the first splicing screen device determines a target SNR of the second port in a receiving direction; Step 450: When the target SNR is greater than the SNR threshold, the first splicing screen device sends first information to the second splicing screen device via the second port; wherein the first information is used to instruct the second splicing screen device to reduce the energy of the signal output to the second port; Step 460: the first splicing screen device receives second information sent by the second splicing screen device via the second port, where the second information is used to instruct the first splicing screen device to reduce energy of a signal output via the second port; Step 470: the first splicing screen device reduces the energy of the signal output via the second port based on the second information.

[0040] In an embodiment of the present application, the first splicing screen device instructs the second splicing screen device to reduce the energy of the signal output to the second port through the first information, which can reduce the cross-port crosstalk from the second splicing screen device to the first port of the first splicing screen device (i.e., the port connected to the controller), and thus can solve the problem of cross-port crosstalk affecting transmission stability in related technologies to a certain extent. In addition, in the self-negotiation stage, by obtaining the first negotiation information obtained via the first port and the second negotiation information obtained via the second port, it can be timely determined whether each port of the first splicing screen device is connected to the controller. When the first splicing screen device is connected to the controller, the step of suppressing crosstalk is performed, and when the first splicing screen device is not connected to the controller, the step of suppressing crosstalk does not need to be performed. In this way, the crosstalk suppression process can be ensured to be more targeted.

[0041] Figure 5 is a flow chart of a method for suppressing crosstalk provided by an embodiment of the present application. Figure 5 , the method for suppressing crosstalk provided by the embodiment of the present application may include: Step 510: The second splicing screen device receives first information transmitted via the second port of the first splicing screen device, where the first information is used to instruct the second splicing screen device to reduce the energy of a signal output to the second port; Step 520: the second splicing screen device reduces the energy of the signal output to the second port based on the first information; Among them, the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device.

[0042] The splicing screen device (including the first splicing screen device and the second splicing screen device) in the embodiment of the present application has multiple ports, which can be network ports for connecting network cables. Different splicing screen devices can be connected through ports. The splicing screen device can have a display screen. The display screens of each splicing screen device can be spliced ​​together to form a larger display screen. The controller is used to output display images to each splicing screen device.

[0043] Please refer to Figure 1In the application environment shown, the signal transmitted by the second splicing screen device to the second port of the first splicing screen device will cause crosstalk to the signal transmitted by the first splicing screen device via the first port, that is, cross-port crosstalk. The stronger the signal transmitted by the second splicing screen device to the second port of the first splicing screen device, the stronger the crosstalk to the signal transmitted by the first splicing screen device via the first port. In the case where the signal transmitted by the second splicing screen device to the second port of the first splicing screen device is weakened, the crosstalk of the signal transmitted by the second splicing screen device to the second port of the first splicing screen device to the signal transmitted by the first splicing screen device via the first port will also be weakened.

[0044] In an embodiment of the present application, the second splicing screen device reducing the energy of the signal output to the second port may include the second splicing screen device reducing the intensity of the signal output to the second port. Specifically, at least one of reducing the amplitude of the signal output via the second port and reducing the voltage conversion rate of the signal output via the second port may be reduced.

[0045] In the method for suppressing crosstalk provided in the embodiment of the present application, when the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device, the second splicing screen device receives the first information transmitted via the second port of the first splicing screen device, and the first information is used to instruct the second splicing screen device to reduce the energy of the signal output to the second port; the second splicing screen device reduces the energy of the signal output to the second port based on the first information. In this way, the second splicing screen device reduces the energy of the signal output to the second port based on the first information, which can reduce the cross-port crosstalk from the second splicing screen device to the first port of the first splicing screen device (i.e., the port connected to the controller), and thus can solve the problem of the related art that the cross-port crosstalk affects the transmission stability.

[0046] Figure 6 is a flow chart of a method for suppressing crosstalk provided by an embodiment of the present application. Figure 6 , the method for suppressing crosstalk provided by the embodiment of the present application may include: Step 610: The second splicing screen device receives first information transmitted via the second port of the first splicing screen device, where the first information is used to instruct the second splicing screen device to reduce the energy of a signal output to the second port; Step 620: the second splicing screen device reduces the energy of the signal output to the second port based on the first information; The second splicing screen device reducing the energy of the signal output to the second port may include the second splicing screen device reducing the intensity of the signal output to the second port. Specifically, at least one of reducing the amplitude of the signal output to the second port and reducing the voltage conversion rate of the signal output to the second port may be selected.

[0047] Step 630: The second splicing screen device sends second information to the second port of the first splicing screen device, where the second information is used to instruct the first splicing screen device to reduce energy of a signal output via the second port.

[0048] Among them, the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device.

[0049] In the embodiments of the present application, Figure 1 As shown, the first port of the first splicing screen device (i.e., the port connected to the controller) is not only subject to cross-port crosstalk (i.e., far-end cross-port crosstalk) from the second splicing screen device, but may also be subject to cross-port crosstalk (i.e., near-end cross-port crosstalk) from the second port of the first splicing screen device. In view of this, in an embodiment of the present application, after receiving the first information, the second splicing screen device may send second information to the second port of the first splicing screen device, and the second information is used to instruct the first splicing screen device to reduce the energy of the signal output via the second port. In this way, the first splicing screen device can receive the second information sent by the second splicing screen device via the second port, and can reduce the energy of the signal output via the second port based on the second information.

[0050] The first splicing screen device reduces the energy of the signal output via the second port, including: the first splicing screen device reduces the strength of the signal output via the second port. Specifically, the first splicing screen device can reduce at least one of the amplitude of the signal output via the second port and the voltage conversion rate of the signal output via the second port.

[0051] In the embodiment of the present application, the second splicing screen device reduces the energy of the signal output to the second port based on the first information, which can reduce the cross-port crosstalk from the second splicing screen device to the first port (i.e., the port connected to the controller) of the first splicing screen device, and thus can solve the problem of the related art cross-port crosstalk affecting the transmission stability to a certain extent. In addition, the second splicing screen device sends the second information to the second port of the first splicing screen device, and the second information is used to instruct the first splicing screen device to reduce the energy of the signal output via the second port, so that the first splicing screen device can reduce the energy of the signal output via the second port, and can reduce the cross-port crosstalk from the second port of the first splicing screen device to the first port (i.e., the port connected to the controller), so that the cross-port far-end crosstalk is reduced while the cross-port near-end crosstalk is reduced, which can further solve the problem of the related art cross-port crosstalk affecting the transmission stability.

[0052] Figure 7 is a specific flow chart of a method for suppressing crosstalk provided by an embodiment of the present application. Figure 7 , after configuring the negotiation field, the splicing screen device can start the self-negotiation process. During the self-negotiation process, the splicing screen device can obtain the link partner negotiation information obtained through each port, and determine whether the device connected to the port is a controller based on the link partner negotiation information. When the device connected to the port is a controller, the process of this port ends. When the device connected to the port is not a controller, the SNR (target SNR) of the receiving direction of this port can be calculated to determine whether the actually calculated SNR has a large margin. If the actually calculated SNR has a large margin (which can be determined by comparing with the SNR threshold), the splicing screen device sends information to the device connected to this port to request to reduce the transmission output energy, and returns to the step of calculating the actual SNR in the receiving direction, and continues to calculate the actual SNR in the receiving direction for the next time. If the actually calculated SNR does not have a large margin (which can be determined by comparing with the SNR threshold), the startup completion information can be sent.

[0053] The splicing screen device (for example, the first splicing screen device or the second splicing screen device) provided in the embodiment of the present application may include: a target physical layer chip (PHY) and a transformer, and the target physical layer chip and the transformer are connected. Each step in the above method embodiment for suppressing crosstalk can be performed by the target physical layer chip in the splicing screen device. At least two ports can also be set on the splicing screen device, and at least two ports can be network ports for connecting network cables. At least two ports can both be connected to the transformer. The target physical layer chip is used to control the output of the at least two ports.

[0054] In the embodiment of the present application, the target physical layer chip may be a physical layer chip that integrates two physical layer chips, or may include two independent physical layer chips. According to the form of the physical layer chip, the target physical layer chip in the embodiment of the present application may include a separate physical layer chip and an integrated physical layer chip. Figure 8 and Figure 9-1 Further discussion.

[0055] Figure 8 Schematic diagram of the internal structure of the splicing screen device provided in the embodiment of the present application. Figure 8 In the example, the target physical layer chip is a separate physical layer chip, that is, two independent physical layer chips are set on one board.

[0056] like Figure 8 As shown, the target physical layer chip includes a first physical layer chip and a second physical layer chip. The first physical layer chip and the second physical layer chip are independent of each other and are separately arranged. The first physical layer chip and the second physical layer chip are both single-port physical layer chips. The first physical layer chip and the second physical layer chip are respectively connected to a transformer; the transformer is respectively connected to the first port and the second port. The first physical layer chip is used to control the output of the first port; the second physical layer chip is used to control the output of the second port.

[0057] In the case of separate physical layer chips, adaptive filtering technology cannot be used to eliminate near-end and far-end crosstalk across ports. When the local physical layer chip cannot obtain information from the adjacent physical layer chip, the local physical layer chip can still suppress near-end and far-end crosstalk across ports, improving the transmission performance of the entire system.

[0058] The specific process is as follows: (1) During the self-negotiation phase, the PAGE1 of the receiving card (all the boards on the splicing screen device) is set to a configuration-specific identifier. This step can be done by setting a specific identifier through FPGA / SOC or hardware. (2) After the self-negotiation, it is obtained whether the port of the current board is connected to the controller (that is, whether the current board is Figure 1 (3) When the physical layer chip of the splicing screen device senses that it is not connected to the port of the controller, the port of the splicing screen device that is not connected to the controller will perform transmission (TX) strength adaptation: request the link partner (Link Partner, LP) to reduce the strength of the output signal (reduce far-end crosstalk); at the same time, the device connected to the device also sends the same request, which can reduce the near-end crosstalk; at the same time, the reduction amplitude is limited by SNR to ensure the stability of the short-line system. (4) When the splicing screen device is connected to the port of the controller, the output signal strength remains unchanged.

[0059] Specifically, during the auto-negotiation phase, the Ethernet Gigabit physical layer chip starts up and first uses FLP pulses to exchange information, including determining M / S, half-duplex and full-duplex, etc. A specific symbol (first target identifier or second target identifier) ​​can be filled in the reserved position of Page1 (Unformatted Next Page). During the negotiation, the symbol will be sent to the link partner (Link Partner, LP). When the physical layer chip can get the symbol, it can be known that the link partner of the port is not the controller, and vice versa, the port is connected to the controller. During the negotiation phase, the pulse signal specified by 100Base-T can be sent for information exchange, which has a very strong anti-interference ability and can ensure that the correct information exchange can be completed even when the line is long (much longer than the line length supported by 1000Base-T).

[0060] like Figure 8 As shown, port B of the first splicing screen device will request the second splicing screen device to reduce the output strength, so that the cross-port far-end crosstalk received by port A of the first splicing screen device is reduced. In addition, port A of the second splicing screen device will request port B of the first splicing screen device to reduce the output strength, so that the cross-port near-end crosstalk received by port A of the first splicing screen device is reduced.

[0061] Among them, reducing the strength of the output signal can be done by reducing the signal output amplitude and slope. Reducing the slope of the output signal can include reducing the voltage conversion rate of the output signal, also known as the slew rate (SR). In addition, the reduction can be predicted locally based on the SNR, or it can be slowly reduced step by step. Among them, the transmission method of the request sent can use a standard packet format for information transmission, or a custom format transmission. The SNR can be calculated based on the output of the decision feedback equalizer.

[0062] Through the above operations, the following effects can be achieved: the signal energy received by port A of the first splicing screen device remains unchanged, and the near-end crosstalk and far-end crosstalk across ports are reduced, thereby improving the transmission performance of the system; the SNR of the short line is guaranteed in the process of TX reducing the output, and stable transmission can still be guaranteed when the received signal and interference are reduced simultaneously; moreover, after the strength of the output signal is changed, the power consumption of the entire splicing screen is reduced.

[0063] Figure 9-1 Schematic diagram of the internal structure of another splicing screen device provided in the embodiment of the present application. Figure 9-1In the example, the target physical layer chip is an integrated physical layer chip. That is, a dual-port physical layer chip is set on a board. Based on the above solution, the internally integrated dual-port Gigabit Ethernet physical layer chip can obtain the information of the neighboring port, so as to further add a cross-port near-end crosstalk canceller on the basis of cross-port crosstalk suppression to achieve further crosstalk reduction. The specific process of suppressing cross-port near-end and far-end crosstalk is similar to Figure 8 The content of the discussion is similar, please refer to the above Figure 8 The content of the discussion.

[0064] Figure 9-2 Schematic diagram of the internal structure of the integrated physical layer chip provided in the embodiment of the present application. Figure 9-2 As shown, the basic architecture includes: PCS (physical coding sublayer) encoding circuit, waveform adjustment circuit, digital-to-analog conversion circuit (DAC), line drive and mixing circuit, AFE (Analog front End) circuit, analog-to-digital conversion circuit (ADC), FFE (FeedForward Equalization) circuit, decision feedback equalizer (DFE), data synchronization circuit 1 (synchronizes the locally transmitted data from the transmitted clock domain to the received clock domain), data synchronization circuit 2 (synchronizes the data transmitted by the adjacent port from the transmitted clock domain of the adjacent port to the local received clock domain), cross-port crosstalk canceller, local port crosstalk canceller, echo canceller, PCS decoding circuit.

[0065] Fig.10 is a structural block diagram of a system for suppressing crosstalk provided by an embodiment of the present application. Fig.10 The crosstalk suppression system 1000 provided in the embodiment of the present application includes a first splicing screen device 1010, a second splicing screen device 1020 and a controller 1030, wherein the first port of the first splicing screen device 1010 is connected to the controller 1030 and the second port of the first splicing screen device 1010 is connected to the second splicing screen device 1020; wherein: The first splicing screen device 1010 is used to determine the target SNR of the second port in the receiving direction; when the target SNR is greater than the SNR threshold, send first information to the second splicing screen device via the second port; wherein the first information is used to instruct the second splicing screen device to reduce the energy of the signal output to the second port; The second splicing screen device 1020 is used to receive first information transmitted via the second port of the first splicing screen device; and reduce the energy of the signal output to the second port based on the first information.

[0066] In the crosstalk suppression system provided in the embodiment of the present application, when the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device, the first splicing screen device determines the target SNR of the second port in the receiving direction; when the target SNR is greater than the SNR threshold, the first splicing screen device sends first information to the second splicing screen device via the second port; wherein the first information is used to instruct the second splicing screen device to reduce the energy of the signal output to the second port. In this way, the first splicing screen device instructs the second splicing screen device to reduce the energy of the signal output to the second port through the first information, which can reduce the cross-port crosstalk from the second splicing screen device to the first port of the first splicing screen device (i.e., the port connected to the controller), and thus can solve the problem of related art cross-port crosstalk affecting transmission stability.

[0067] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0068] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0069] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for suppressing crosstalk, characterized in that: include: When the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device, the first splicing screen device determines a target signal-to-noise ratio of the second port in a receiving direction; When the target signal-to-noise ratio is greater than the signal-to-noise ratio threshold, the first splicing screen device sends the first information to the second splicing screen device via the second port; The first information is used to instruct the second splicing screen device to reduce the energy of the signal output to the second port.

2. The method according to claim 1, characterized in that After sending the first information to the second splicing screen device via the second port, the method further includes: The first splicing screen device receives second information sent by the second splicing screen device via the second port, where the second information is used to instruct the first splicing screen device to reduce energy of a signal output via the second port; The first splicing screen device reduces the energy of a signal output via the second port based on the second information.

3. The method according to claim 2, characterized in that The reducing the energy of the signal output via the second port includes at least one of reducing the amplitude of the signal output via the second port and reducing the voltage conversion rate of the signal output via the second port.

4. The method according to claim 1, characterized in that: Before the first splicing screen device determines the target signal-to-noise ratio of the second port in the receiving direction, the method further includes: The first splicing screen device obtains first negotiation information obtained via the first port and second negotiation information obtained via the second port during the self-negotiation stage; The first splicing screen device determines, based on the first negotiation information, that the device connected to the first port is a controller; The first splicing screen device determines, based on the second negotiation information, that the device connected to the second port is a device other than the controller.

5. The method according to claim 4, characterized in that The first negotiation information includes a first target identifier, and the first target identifier indicates that the device connected to the first port of the first splicing screen device is a controller; or, The second negotiation information includes a second target identifier, and the second target identifier indicates that the device connected to the second port of the first splicing screen device is a device other than a controller.

6. The method according to any one of claims 1 to 5, characterized in that: The first splicing screen device includes a first physical layer chip, a second physical layer chip and a transformer; the first physical layer chip and the second physical layer chip are respectively connected to the transformer; the transformer is respectively connected to the first port and the second port; the first physical layer chip is used to control the output of the first port; the second physical layer chip is used to control the output of the second port.

7. A method for suppressing crosstalk, characterized in that: include: The second splicing screen device receives first information transmitted via the second port of the first splicing screen device, where the first information is used to instruct the second splicing screen device to reduce the energy of a signal output to the second port; The second splicing screen device reduces the energy of the signal output to the second port based on the first information; Among them, the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device.

8. The method according to claim 7, characterized in that After the second splicing screen device receives the first information transmitted via the second port of the first splicing screen device, the method further includes: The second splicing screen device sends second information to the second port of the first splicing screen device, where the second information is used to instruct the first splicing screen device to reduce energy of a signal output via the second port.

9. The method according to claim 7 or 8, characterized in that: The reducing the energy of the signal output to the second port includes: reducing at least one of the amplitude of the signal output to the second port and reducing the voltage conversion rate of the signal output to the second port.

10. A system for suppressing crosstalk, characterized in that: It includes a first splicing screen device, a second splicing screen device and a controller, wherein the first port of the first splicing screen device is connected to the controller and the second port of the first splicing screen device is connected to the second splicing screen device; wherein: The first splicing screen device is used to determine a target signal-to-noise ratio of the second port in a receiving direction; when the target signal-to-noise ratio is greater than a signal-to-noise ratio threshold, send first information to the second splicing screen device via the second port; wherein the first information is used to instruct the second splicing screen device to reduce the energy of the signal output to the second port; The second splicing screen device is used to receive first information transmitted via the second port of the first splicing screen device; based on the first information, reduce the energy of the signal output to the second port.

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