CN114222178A

CN114222178A - HDMI active optical cable and method and medium for synchronizing termination state information thereof

Info

Publication number: CN114222178A
Application number: CN202210158260.6A
Authority: CN
Inventors: 曹蔚然; 江辉; 周新亮; 李艺
Original assignee: Everpro Technologies Wuhan Co Ltd
Current assignee: Everpro Technologies Wuhan Co Ltd
Priority date: 2022-02-21
Filing date: 2022-02-21
Publication date: 2022-03-22
Anticipated expiration: 2042-02-21
Also published as: CN114222178B

Abstract

The application relates to an HDMI active optical cable and a method and a medium for synchronizing termination state information thereof, wherein the HDMI active optical cable comprises a transmitting end and a receiving end which are arranged oppositely, and the method comprises the following steps: detecting an HDCP signal of a receiving end or detecting a signal of a photoelectric converter of the receiving end; acquiring termination state information of the receiving end according to the detection result, and feeding back the termination state information of the receiving end to the sending end, wherein the termination state information comprises a termination state and an endless termination state; and controlling the sending end to be in the non-terminated state in response to the fact that the received termination state information of the receiving end is in the non-terminated state. The method and the device for detecting the terminating state of the receiving end expand the mode for designers have larger selection space, and can select different detection modes according to different requirements such as cost, sensitivity and reliability, so that the designed product can be suitable for different application environments or requirements.

Description

HDMI active optical cable and method and medium for synchronizing termination state information thereof

Technical Field

The present application relates generally to the field of active optical cables, and in particular, to an HDMI active optical cable, a method for synchronizing termination status information thereof, and a computer-readable storage medium.

Background

A High Definition Multimedia Interface (HDMI) is a fully digital video and audio transmission Interface, and can transmit uncompressed audio and video signals. The HDMI can be used for set-top boxes, DVD players, personal computers, game hosts, comprehensive amplifiers, digital stereos, televisions and other equipment. HDMI can send audio frequency and video signal simultaneously, because audio frequency and video signal adopt same wire rod, has simplified the installation degree of difficulty of system's circuit greatly.

The cable length of HDMI is a major problem limiting its application. Increasing the diameter of the copper wires in the cable to reduce the impedance is one of the methods that are effective in extending the length of the cable. Some manufacturers also make HDMI signal boosters to meet the needs of users.

The HDMI Active Optical Cable (HDMI Active Optical Cable) well solves the problem that the HDMI Cable is limited by length, and the length of the HDMI Cable can be hundreds of meters or even longer under the condition that the Cable is thin enough and light enough. The HDMI active optical cable is an optical fiber manufactured HDMI signal transmission line, and integrates a photoelectric converter at an interface. The HDMI active optical cable comprises a sending end (TX) and a receiving end (RX), wherein the sending end is connected with a video Source end (Source, such as a computer host, a player and the like), and the receiving end is connected with a playing end (Sink, such as a television, a display and the like). The main transmission principle is that a sending end receives an electric signal from a video source end, a photoelectric converter of the sending end converts the electric signal into an optical signal, the optical signal is transmitted to a receiving end through an optical fiber, the optical signal is converted into the electric signal by an electro-optical converter of the receiving end and is output to a playing end, and the playing end completes operations such as picture display, sound playing and the like.

Fig. 1 shows a schematic structural diagram of an HDMI active optical cable. For clarity, a video Source (Source) and a broadcast (Sink) connected to the HDMI active cable are also shown by dashed boxes. The HDMI active optical cable includes a sending end TX and a receiving end RX, where the sending end is connected to a video source end (e.g., a host) through a connector, and the receiving end is connected to a playing end (e.g., a display) through a connector. The transmitting end and the receiving end are both provided with corresponding photoelectric converters, and the photoelectric converter of the transmitting end and the photoelectric converter of the receiving end are connected through optical fibers and are used for transmitting four-path TMDS (Transition Minimized Differential Signaling) high-speed signals to form a high-speed signal channel. The four-way TMDS signal includes:

(TMDS Data0+, TMDS Data0-), (TMDS Data1+, TMDS Data1-), (TMDS Data2+, TMDS Data2-), (TMDS Data3+, TMDS Data 3-). A control signal channel is arranged between the sending end and the receiving end and used for transmitting control signals (transmitted by copper wires), the control signals comprise SCL, SDA, HPD (Hot Plug Detect ) and the like (other control signals are not shown), the SCL and the SDA are IIC buses and are used for transmitting HDCP data, wherein the HDCP (High-bandwidth Digital Content Protection) can interfere with each other and reduce the quality of copied images, and therefore Content is protected. The HPD signal is a detection signal generated from the transmitting side and output to the receiving side. The function is that when a display device with an HDMI interface such as a display is connected or disconnected with an HDMI active optical cable through the HDMI interface, the HDMI transmitting end can detect the event through an HPD signal and respond.

Currently, there is a problem of HDMI active cable Termination state (HDMI AOC Termination) synchronization. For example, when the HDMI active optical cable is in use, the playing end (e.g., a display or a television) is already dormant or disconnected, and the video source end cannot detect the HDMI active optical cable, which may cause an error, such as a failure of lighting the playing end or a screen flashing of the playing end due to the non-synchronization of the termination status information. For another example, in the application scenario shown in fig. 2, one host is connected to the tv a through one HDMI active optical cable, and is connected to the tv B through another HDMI active optical cable, video content transmitted through the HDMI active optical cable is protected by the HDCP, when one tv is turned off or is dormant, for example, the tv a is turned off, the host may not know the event, and still performs high-speed signal transmission and HDCP signal transmission, because the tv a is turned off and cannot correctly respond to the HDCP signal transmission, the HDCP signal handshake fails, and the host considers that an illegal device is accessed, and stops outputting the video content, which may cause that another tv B that is not turned off cannot normally display. At this time, the HDMI active cable of tv a needs to be unplugged, and tv B can normally display.

In order to solve the above problems, a patent document with publication number CN109309820B discloses an HDMI active optical cable, which includes a detection module disposed at a receiving end of the HDMI active optical cable, a configuration module disposed at a transmitting end, the detection module and the configuration module being connected by an optical fiber or a copper wire, the monitoring module being configured to acquire TMDS signal voltage converted by the receiving end through a photoelectric converter to obtain termination state information, for example, voltage of any one of four channels of the TMDS may be acquired, and if the voltage is higher than a certain threshold (e.g., 2.2V), it represents that the receiving end is in a termination state, and it is considered that the receiving end is connected with a playing end and an HDMI interface of the playing end is in a working state; on the contrary, if the voltage is lower than the threshold, it represents that the receiving end is in a non-terminated state, and the receiving end is considered to be disconnected from the playing end or the HDMI interface of the playing end is in a standby state. Furthermore, the monitoring module feeds back the termination state information of the receiving end to the configuration module through an optical fiber or a copper wire, and the configuration module adjusts the TMDS level of the transmitting end by controlling the photoelectric converter so as to synchronize the termination state of the transmitting end with the receiving end.

The technical scheme provides a feasible way for solving the problem of synchronization of the termination state information. From the perspective of product design, for example, when designing an HDMI active optical cable, a designer may want to select different synchronization modes according to different requirements such as cost, sensitivity, reliability, and the like, so that the product can be suitable for different application environments or requirements. That is, one way to solve the termination state information synchronization problem is not enough, and more termination state information synchronization ways are needed to provide designers with more choices.

Disclosure of Invention

The application provides a method for synchronizing termination state information of an HDMI active optical cable, so that more choices are provided for designers. Meanwhile, the application also provides an HDMI active optical cable and a computer readable storage medium for realizing the method.

According to a first aspect of the present application, there is provided a method for implementing termination state information synchronization of an HDMI active optical cable, the HDMI active optical cable including a transmitting end and a receiving end arranged oppositely, the receiving end having a photoelectric converter, the method comprising: detecting an HDCP signal of a receiving end or detecting a signal of a photoelectric converter of the receiving end; acquiring termination state information of the receiving end according to the detection result, and feeding back the termination state information of the receiving end to the sending end, wherein the termination state information comprises a termination state and an endless termination state; and controlling the sending end to be in the non-terminated state in response to the fact that the received termination state information of the receiving end is in the non-terminated state.

In one embodiment, the obtaining the termination state information of the receiving end according to the detection result includes: detecting an HDCP signal of a receiving end, and acquiring termination state information of the receiving end according to the HDCP signal.

In one embodiment, the obtaining the termination state information of the receiving end according to the detection result includes: accessing the photoelectric converter to obtain termination state information of the receiving end.

In one embodiment, the obtaining the termination state information of the receiving end according to the detection result includes: and detecting signals inside the photoelectric converter, and acquiring termination state information of the receiving end according to the signals inside the photoelectric converter.

In one embodiment, an HPD signal channel is provided between the sending end and the receiving end; the feedback of the termination state information of the receiving end to the sending end comprises the following steps: and feeding back the termination state information of the receiving end to the transmitting end through the HPD signal channel.

In one embodiment, a feedback channel independent of a control signal channel between the transmitting end and the receiving end is provided between the transmitting end and the receiving end, and the feedback channel comprises a wire or an optical fiber connected between the transmitting end and the receiving end; the feedback of the termination state information of the receiving end to the sending end comprises the following steps: and feeding back the termination state information of the receiving end to the sending end through the feedback channel.

In one embodiment, the feedback channel comprises a wire; feeding back the termination state information of the receiving end to the transmitting end through the feedback channel comprises: pulling the level on the wire high or low, or transmitting serial data on the wire.

In one embodiment, in response to receiving that the termination state information of the receiving end is a terminated state, the transmitting end is controlled to be in the terminated state.

According to a second aspect of the present application, an HDMI active optical cable is provided, which includes a transmitting end, a receiving end and an optical cable connecting the transmitting end and the receiving end, which are arranged oppositely, where the HDMI active optical cable is used to implement any one of the methods for implementing synchronization of termination status information of the HDMI active optical cable in the first aspect of the present application.

According to a third aspect of the present application, there is provided a computer readable storage medium comprising a computer program for implementing a method of synchronization of termination status information of an HDMI active optical cable, which when executed implements any one of the methods of synchronization of termination status information of an HDMI active optical cable described in the first aspect of the present application.

According to the method for achieving the synchronization of the termination state information of the HDMI active optical cable, when the receiving end is detected to be in the no-termination state, the information is timely fed back to the sending end, and the sending end adjusts the self termination state to enable the termination state of the sending end to be consistent with that of the receiving end. Therefore, when the playing end is powered on again or awakened, the receiving end can acquire the information and transmit the information to the sending end, so that the synchronization of the receiving end and the sending end is realized, the compatibility of the HDMI active optical cable is improved, and various problems caused by the fact that the termination state information cannot be synchronized can be avoided. More importantly, the method for detecting the termination state information of the receiving end in the application is different from the prior art, for example, the termination state information of the receiving end is judged by judging whether the HDCP signal is abnormally transmitted, and the termination state information of the receiving end is obtained by detecting the signal of the photoelectric converter. Due to the expansion of the detection modes, designers have larger selection space and can select different detection modes according to different requirements such as cost, sensitivity and reliability, so that the designed product can be suitable for different application environments or requirements.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present application will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present application are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:

fig. 1 is a schematic structural diagram of an HDMI active optical cable;

fig. 2 is a schematic diagram of an application scenario of an HDMI active optical cable;

fig. 3 is a flow chart of a method for implementing termination status information synchronization for an HDMI active optical cable according to an embodiment of the present application;

FIG. 4 is a schematic diagram of an HDMI active optical cable configuration for implementing termination status information synchronization according to the present application;

FIG. 5 is a schematic diagram of a connection structure between the MCU and the photoelectric converter according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a connection structure between the MCU and the photoelectric converter according to another embodiment of the present application;

fig. 7 is a schematic diagram of an HDMI active optical cable architecture implementing termination status information synchronization in accordance with another embodiment of the present application;

FIG. 8 is a flow diagram of a method of processing termination status information according to one embodiment of the present application;

figure 9 is a flow diagram of a method of processing termination status information according to another embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be understood that the terms "first", "second", etc. when used in the claims, specification and drawings of this application are used solely to distinguish one from another and are not intended to describe a particular sequence. The terms "comprises" and "comprising," when used in the specification and claims of this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Fig. 3 illustrates a method for implementing termination status information synchronization of an HDMI active optical cable according to an embodiment of the present application. Wherein, the transmitting end is denoted as TX and the receiving end is denoted as RX. The method includes steps S1 through S6. Wherein the steps S1 to S3 are performed by the initiator, and the steps S4 to S6 are performed by the initiator.

In step S1, the HDCP signal of the receiving end or the signal of the photoelectric converter of the receiving end is detected.

Step S2, obtaining termination state information of the receiving end according to the detection result, where the termination state information includes a termination state and an no-termination state;

step S3, feeding back the termination status information of the receiving end to the sending end.

Step S4, the sending end receives the termination status information of the receiving end.

Step S5, if the termination state information of the receiving end is no termination state, go to step S6;

and step S6, controlling the sending end to be in a non-end connection state.

During the use of the HDMI active optical cable, the receiving end continuously performs step S1 to detect the HDCP signal at the receiving end or the signal of the optical-to-electrical converter at the receiving end. For example, the signals may be detected and processed at regular time intervals, or may be detected and processed in an interrupted manner.

The termination state information of the receiving end comprises a termination state and an unterminated state. The receiving end is in a terminating state, which indicates that the receiving end is connected with the playing end, and the HDMI of the playing end is in a working state; the receiving end is in a no-end state, which means that the receiving end is disconnected from the playing end or the HDMI interface of the playing end is in a standby state, for example, the playing end is dormant or disconnected, so that the end state information of the receiving end is in the no-end state.

In step S6, the transmitting end is controlled to be in the non-terminated state, so that the terminating state of the transmitting end is consistent with the terminating state of the receiving end, thereby synchronizing the terminating state information of the HDMI active optical cable. The implementation result of step S6 is equivalent to disconnecting the sending end from the video source end, and disconnecting the receiving end from the playing end, that is, the entire HDMI active optical cable is pulled out from the video source end and the playing end. Specifically, the transmitting end may put the transmitting end in a no-termination state by lowering a level of a high speed signal channel (TMDS). For example, the TMDS voltage of the input optical-to-electrical converter may be controlled by a configuration module described in patent document CN109309820B to configure the termination state of the transmitting end.

The present application is characterized in that, in step S1, the HDCP signal of the receiving end or the signal of the optical-to-electrical converter of the receiving end is detected to obtain the termination state information of the receiving end, thereby providing a technical concept different from the technical scheme described in the background art. The following is a detailed description.

Fig. 4 shows a schematic structural diagram of an HDMI active optical cable for implementing termination state information synchronization according to the present application. The HDMI active optical cable comprises a transmitting end TX and a receiving end RX, a one-way TMDS high-speed signal channel (optical fiber) and a control signal channel (copper wire) are arranged between the transmitting end and the receiving end, and the control signal channel at least comprises an IIC channel (SDA and SCL) and an HPD signal channel which are used for transmitting DHCP signals. The transmitting end includes first MCU 11 and first photoelectric converter 12, be equipped with serial communication line 13 between first MCU 11 and the first photoelectric converter 12 (for example, MCU 11 controls first photoelectric converter 12 through serial communication line 13, reduces the level of high-speed signal channel (TMDS), so that the transmitting end is in no end connection state), the receiving end includes second MCU 21 and second photoelectric converter 22, be equipped with serial communication line 23 between second MCU 21 and the second photoelectric converter 22. Wherein the SDA, SCL and HPD are connected between the first MCU 11 and the second MCU 21, for example, the SDA, SCL and HPD are connected to the corresponding IO ports of the first MCU 11 and the second MCU 21.

In this application, the main body implementing step S1 is the second MCU 21, and the second MCU 21 can acquire the termination state information of the receiving end in three ways, which will be described below.

In the first mode, the second MCU 21 detects an HDCP signal at a receiving end, and acquires termination state information of the receiving end according to the HDCP signal. The HDCP signal is transmitted on the signal line SDA and the signal line SCL, which are IIC bus lines (Integrated Circuit bus lines). The second MCU 21 detects the HDCP signal on the IIC bus, and determines that the receiving end is in a non-terminated state if the HDCP signal is found to be unable to be transmitted normally. If the HDCP signal can be normally transmitted, the receiving end is judged to be in a termination state. The criterion for whether the HDCP signal is normally transmitted may be determined according to the technical specification related to HDCP, and is not described herein again. To sum up, the second MCU 21 detects the HDCP signal of the HDCP channel, and can obtain the termination state information of the receiving end according to the transmission state of the HDCP signal.

In a second way, the opto-electric converter is accessed to obtain termination status information of the receiving end. Fig. 5 shows a schematic diagram of a connection structure between the second MCU 21 and the second photoelectric converter 22 according to an embodiment. The second photoelectric converter 22 is shown by a dashed box in fig. 5, and includes a photodiode D, a transimpedance amplifier, a limiter, a decision circuit, a demultiplexer, and a processor, which are connected in sequence. Wherein the photodiode D is used to convert an optical signal into an electrical signal. The transimpedance amplifier serves to amplify the output of the photodiode D with low noise and sufficient bandwidth and convert it into a voltage. The limiter is used for carrying out high-gain amplification on the output of the trans-impedance amplifier. The decision circuit is used to eliminate noise. The demultiplexer is used to convert the serial signal into a parallel signal. The processor is used for controlling the circuit modules such as the transimpedance amplifier, the decision circuit and the demultiplexer. It should be noted that the photoelectric converter and the photodiode D thereof, the transimpedance amplifier, the amplitude limiter, the decision circuit, the demultiplexer, and the processor are all in the prior art, and therefore specific details of these circuit blocks are not described herein again. As shown in fig. 5, the second MCU 21 is connected to the processor through a serial communication line 23, and the processor serves as a core control component of the second photoelectric converter 22, and acquires signals inside the second photoelectric converter, so as to obtain termination state information of a receiving end, for example, the termination state information of the receiving end can be stored in a register, and the second MCU 21 accesses the processor through the serial communication line 23 (for example, an IIC serial line), so as to access the register to obtain the termination state information of the receiving end. In summary, the second MCU 21 can obtain the termination state information of the receiving end by accessing the second photoelectric converter 22.

In the third mode, a signal inside the optical-to-electrical converter (instead of a TMDS signal outside the optical-to-electrical converter, such as TMDS Data) is detected, and the termination state information of the receiving end is acquired according to the signal inside the optical-to-electrical converter. Fig. 6 shows a schematic diagram of a connection structure of the second MCU 21 and the second photoelectric converter 22 according to another embodiment of the present application. According to the second mode, the processor can collect the internal signal of the second photoelectric converter 22 to obtain the termination state information of the receiving end. Therefore, the second MCU 21 can also directly sample the voltage signal connected to the inside of the second photoelectric converter 22 to obtain the termination state information of the receiving end. For example, the second MCU 21 may be directly connected to a demultiplexer to determine the termination state of the receiving end according to the magnitude of the voltage signal. The specific criterion may be determined according to the technical specification of the photoelectric converter.

In the embodiment shown in fig. 4, when step S3 is implemented, the termination state information of the receiving end may be fed back to the sending end through the HPD signal path. For example, if the termination state information of the receiving end is in a no-termination state, the second MCU 21 pulls down the HPD signal. The first MCU 11 at the transmitting end detects that the HPD signal changes from high level to low level, and can determine that the receiving end is in a no-termination state. For another example, if the termination state information of the receiving end is a terminated state, the second MCU 21 pulls up the HPD signal or keeps the HPD signal. When the first MCU 11 at the transmitting end detects that the HPD signal is at a high level, it may determine that the receiving end is in a terminated state.

The HPD signal itself belongs to the control signal channel of the HDMI active optical cable, but in some cases, the HPD signal may not work normally to reflect hot plug information, so the embodiment may apply the HPD signal. For example, when the HPD signal can work normally, the method of this embodiment does not affect the transmission of the HPD signal, and when the HPD signal cannot work normally, the method of this embodiment can make the HPD signal correctly reflect the termination state of the receiving end.

Fig. 7 shows a schematic diagram of another HDMI active optical cable structure for implementing termination status information synchronization according to the present application. This embodiment differs from the embodiment shown in fig. 4 only in that a feedback path independent of the control signal path is provided between the transmitting end and the receiving end, and the feedback path includes a wire or an optical fiber connected between the transmitting end and the receiving end. As shown in fig. 7, a feedback channel between the first MCU 11 and the second MCU 21 is a conducting wire Ctrl (a copper wire may be used), and at this time, the first MCU 11 and the second MCU 21 are directly connected to the conducting wire Ctrl through the IO port. In other embodiments, the feedback channel may also adopt an optical fiber, and in this case, the transmitting end and the receiving end may be provided with optical coupling elements for performing photoelectric conversion so as to enable the MCU to be adapted to the optical fiber.

Similar to controlling the HPD signal to feed back the termination state information of the receiving end, if the termination state information of the receiving end is in a no-termination state, the second MCU 21 pulls down the Ctrl signal. When the first MCU 11 at the transmitting end detects that the Ctrl signal is at a low level, it may be determined that the receiving end is in an endless state. If the termination state information of the receiving end is a terminated state, the second MCU 21 raises the Ctrl signal. When the first MCU 11 at the transmitting end detects that the Ctrl signal is at a high level, it may be determined that the receiving end is in a terminated state.

The feedback channel is independent of the control signal channel of the HDMI active optical cable, and therefore in this embodiment, the structure of the HDMI active optical cable needs to be improved to increase the feedback channel. Since the feedback channel is added, it may be meaningful as needed in design, for example, the Ctrl signal may be set to be high to indicate that the receiving end is in a non-terminated state, and the Ctrl signal may be set to be low to indicate that the receiving end is in a terminated state. In some embodiments, the Ctrl line may also be configured to transmit specific serial data to indicate the termination status information of the receiving end, for example, a string of preset codes to indicate the termination status information of the receiving end.

According to the method of the embodiment of the application, when the playing end is turned off or is in a dormant state, the receiving end is in an end-to-end state, the receiving end feeds back the information to the sending end in time, and the sending end adjusts the end-to-end state of the sending end to enable the end-to-end state of the sending end to be consistent with that of the receiving end. Therefore, when the playing end is powered on again or awakened, the receiving end can acquire the information and transmit the information to the sending end, so that the synchronization of the receiving end and the sending end is realized, the compatibility of the HDMI active optical cable is improved, and various problems caused by the fact that the termination state information cannot be synchronized can be avoided. For example, in the application scenario shown in fig. 2, if the tv a is turned off or is in a sleep state, the transmitting end of the corresponding HDMI active optical cable is in an end-connection-free state, which is equivalent to the HDMI cable being pulled out, so that the operation of the tv B is not affected, and the tv B can normally play videos.

Figure 8 illustrates a flow diagram of a method of processing termination status information according to one embodiment of the present application. At the receiving end, the second MCU 21 acquires the termination state information of the receiving end, and if the receiving end is in the no-termination state, step S81 is executed, and the second MCU 21 pulls down the HPD signal. In step S83, the first MCU 11 detects that the HPD signal changes from high level to low level, and then it executes step S84, and the first MCU 11 controls the first photoelectric converter 12 to make the transmitting end in a non-connected state.

If the receiving end is in the terminated state, step S82 is executed, and the second MCU 21 pulls the HPD signal high. In step S85, the first MCU 11 detects that the HPD signal is at a high level, and then executes step S86, and the first MCU 11 controls the first photoelectric converter 12 to make the transmitting end in a terminated state or to keep the transmitting end in a terminated state.

Figure 9 illustrates a flow diagram of a method of processing termination status information according to another embodiment of the present application. At the receiving end, the second MCU 21 obtains the termination state information of the receiving end, and if the receiving end is in the no-termination state, step S91 is executed, and the second MCU 21 pulls down the Ctrl signal. In step S93, if the first MCU 11 detects that the Ctrl signal is at a low level, it executes step S94, and the first MCU 11 controls the first photoelectric converter 12 to make the transmitting end in a non-connected state.

If the receiving end is in the terminated state, step S92 is executed, and the second MCU 21 pulls up the Ctrl signal. In step S95, if the first MCU 11 detects that the Ctrl signal is at a high level, step S96 is executed, and the first MCU 11 controls the first photoelectric converter 12 to enable the transmitting end to be in a terminated state or maintain the transmitting end to be in a terminated state.

According to the second aspect of the application, the HDMI active optical cable comprises a transmitting end, a receiving end and an optical cable connecting the transmitting end and the receiving end, wherein the transmitting end and the receiving end are arranged oppositely. The HDMI active optical cable is used to implement the method steps described in the method embodiments of the first aspect of the present application. For example, the receiving end is configured to implement steps S1 to S3 of the method of fig. 3, steps S81 and 82 of the method of fig. 8, steps S91 and S92 of the method of fig. 9, the transmitting end is configured to implement steps S4 to S6 of the method of fig. 3, steps 83 to S86 of the method of fig. 8, and steps 93 to S96 of the method of fig. 9.

As a further improvement, a feedback channel can be added on the basis of the existing HDMI active optical cable. Since the method of the first aspect of the present application has been described in detail above, it is not described herein again. The HDMI active optical cable can realize the synchronization of termination states, so that the compatibility of the HDMI active optical cable is improved.

According to a third aspect of the present application, there is provided a computer readable storage medium having stored thereon a computer program which, when executed, performs the method steps described in the method embodiments of the first aspect of the present application.

It should be noted that the computer program described in the present application is divided into two parts, for example, one part is stored in the receiving end, and the other part is stored in the transmitting end. For example, the computer program for implementing steps S1 to S3 of the method of fig. 3 may be stored in the receiver and may be executed by the second MCU 21, and the computer program for implementing steps S4 to S6 of the method of fig. 3 may be stored in the transmitter and may be executed by the first MCU 11. Similarly, the computer programs implementing steps S81 and S82 of the method of fig. 8, and implementing steps S91 and S92 of the method of fig. 9 are stored in the receiving end; computer programs for implementing steps 83 to S86 of the method of fig. 8, and steps 93 to S96 of the method of fig. 9 are stored at the transmitting end.

Since the method of the first aspect of the present application has been described in detail above, it is not described herein again. By executing the computer program, the synchronization of the termination state information of the HDMI active optical cable can be realized, so that the compatibility of the HDMI optical cable is improved.

In the present application, the aforementioned readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. For example, the computer-readable storage medium may be any suitable magnetic or magneto-optical storage medium, such as resistive Random Access Memory (rram), Dynamic Random Access Memory (dram), Static Random Access Memory (SRAM), enhanced Dynamic Random Access Memory (edram), High-Bandwidth Memory (HBM), hybrid Memory cubic (hmc) Memory cube, and the like, or any other medium that can be used to store the desired information and that can be accessed by an application, a module, or both. Any such computer storage media may be part of, or accessible or connectable to, a device. Any applications or modules described herein may be implemented using computer-readable/executable instructions that may be stored or otherwise maintained by such computer-readable media.

In light of the foregoing description of the present specification, those skilled in the art will also understand that terms used to indicate orientation or positional relationship, such as "upper" and "lower", are based on the orientation or positional relationship shown in the drawings of the present specification, which are used for the purpose of convenience in explaining aspects of the present application and simplifying description, and do not explicitly or implicitly indicate that the device or element involved must have the specific orientation, be constructed and operated in the specific orientation, and thus the above-described orientation or positional relationship terms should not be interpreted or construed as limiting the aspects of the present application.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A method for synchronizing termination status information of an HDMI active optical cable, the HDMI active optical cable comprising a transmitting end and a receiving end which are oppositely arranged, the receiving end having a photoelectric converter, the method comprising:

detecting an HDCP signal of a receiving end or detecting a signal of a photoelectric converter of the receiving end;

acquiring termination state information of the receiving end according to the detection result, and feeding back the termination state information of the receiving end to the sending end, wherein the termination state information comprises a termination state and an endless termination state;

and controlling the sending end to be in the non-terminated state in response to the fact that the received termination state information of the receiving end is in the non-terminated state.

2. The method of claim 1, wherein obtaining the termination state information of the receiving end according to the detection result comprises:

detecting an HDCP signal of a receiving end, and acquiring termination state information of the receiving end according to the HDCP signal.

3. The method of claim 1, wherein obtaining the termination state information of the receiving end according to the detection result comprises:

accessing the photoelectric converter to obtain termination state information of the receiving end.

4. The method of claim 1, wherein obtaining the termination state information of the receiving end according to the detection result comprises:

and detecting signals inside the photoelectric converter, and acquiring termination state information of the receiving end according to the signals inside the photoelectric converter.

5. The method of claim 1, wherein an HPD signal path is provided between the transmitting end and the receiving end; the feedback of the termination state information of the receiving end to the sending end comprises the following steps:

and feeding back the termination state information of the receiving end to the transmitting end through the HPD signal channel.

6. The method according to claim 1, wherein a feedback channel independent of a control signal channel between the transmitting end and the receiving end is provided between the transmitting end and the receiving end, and the feedback channel comprises a wire or an optical fiber connected between the transmitting end and the receiving end; the feedback of the termination state information of the receiving end to the sending end comprises the following steps:

and feeding back the termination state information of the receiving end to the sending end through the feedback channel.

7. The method of claim 6, wherein the feedback channel comprises a wire; feeding back the termination state information of the receiving end to the transmitting end through the feedback channel comprises:

pulling the level on the wire high or low, or transmitting serial data on the wire.

8. The method according to any one of claims 1 to 7,

and controlling the sending end to be in the terminated state in response to the received termination state information of the receiving end being in the terminated state.

9. An HDMI active optical cable, comprising a transmitting end, a receiving end and an optical cable connecting the transmitting end and the receiving end, which are arranged oppositely, wherein the HDMI active optical cable is used for implementing the method for implementing the synchronization of the termination state information of the HDMI active optical cable according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a computer program for implementing a method of termination status information synchronization of an HDMI active optical cable, which when executed implements the method of any of claims 1 to 8.