CN112637536A - Multimedia control card and identification method thereof and image array device - Google Patents
Multimedia control card and identification method thereof and image array device Download PDFInfo
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Abstract
The invention provides a multimedia control card and an identification method thereof, which change a control signal from a first level (level) to a second level by driving a switcher circuit, and then output the control signal by a multimedia interface. Then, the multimedia interface receives a first response signal, and the first response signal corresponds to the control signal. And finally, identifying the connection state of the multimedia interface according to the first response signal. In one embodiment, the multimedia control card and the identification method can be applied to a switch, such as: an image array device.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to a technology for identifying a multimedia input or output device, in particular to a multimedia control card, an identification method thereof and an image array device, which can automatically identify a multimedia input device or an output device and provide a false-receiving message to prompt a user.
[ background of the invention ]
Please refer to fig. 1A and 1B, which are schematic diagrams of a multi-port (port) multimedia switch device in the prior art. A conventional multimedia switching apparatus generally has a plurality of input ports and a plurality of output ports, each input port is used for coupling with a multimedia signal input device (e.g., a DVD player or a computer, etc.), and each output port is used for coupling with a multimedia signal output apparatus (e.g., a flat panel display or a projector).
Generally, each port interface of the multi-port multimedia switching device is predefined as an input port or an output port during design. For example: the upper row of interfaces in fig. 1A is defined as input ports 100, while the lower row of interfaces in fig. 1A is defined as output ports 101; alternatively, each interface in the left half of fig. 1B is defined as an output port 102, and each interface in the right half of fig. 1B is defined as an input port 103.
As shown in fig. 2, the HDMI transmission protocol is illustrated. When a multimedia signal input device (e.g., a computer or a DVD player) is connected to a multimedia signal output device (e.g., a display device such as a television or a projector), communication is performed according to the HDMI communication protocol, in which the multimedia signal input device sends a 5V Vcc signal to the multimedia signal output device, the multimedia signal output device adjusts a signal level of a Hot Plug Detection (HPD) channel to a HIGH (HIGH) level (level), and then the multimedia signal input device requests EDID information from the multimedia signal output device through a display information channel (DDC). After the multimedia signal output device replies EDID information of the multimedia signal input device, the multimedia signal input device outputs TMDS signals to the multimedia signal output device through the TMDS channel, and further displays corresponding images and audio.
In the flow of the HDMI transport protocol, there is no mechanism for the user to identify whether there is a wrong input or output device for the multimedia signal, so that when the multi-port multimedia switching device is used, if the input device or the output device is connected to the opposite port, i.e. the output device is connected to the input port, or the input device is connected to the output port, the user cannot know the wrong input or output device in real time at the first time point. Therefore, when a multi-port multimedia switching device connects a plurality of multimedia signal input devices and multimedia signal output devices, once a problem of connection to the opposite port occurs, a user often needs to spend a lot of time to determine whether each port has a wrong connection.
In summary, there is a need for a multimedia control card, a method for identifying the same, and an image array device to solve the problems of the prior art.
[ summary of the invention ]
The invention provides a multimedia control card, an identification method thereof and an image array device, which can detect the response of an external device to judge whether the external device is connected correctly or wrongly or is not connected, reduce the time required by a user to debug and correct a connection error and improve the use convenience.
In one embodiment, the present invention provides a method for identifying a multimedia control card, which includes the steps of first, using a switch circuit to drive a control signal to change from a first level (level) to a second level. Then, the multimedia interface outputs the control signal. Then, the multimedia interface detects the first response signal, and the first response signal corresponds to the control signal. Finally, the connection state of the multimedia interface is identified according to the first response signal.
In another embodiment, the present invention provides a multimedia control card having a signal receiving function or a signal outputting function, the multimedia control card comprising a multimedia interface, a switch circuit and a controller. The switch circuit is connected with the multimedia interface, drives the control signal to change from a first level to a second level and outputs the control signal through the multimedia interface. The switch circuit receives a first response signal from the multimedia interface. The first response signal is a control signal corresponding to the second level. The controller is connected with the switcher circuit, and the controller identifies the connection state of the multimedia interface according to the first response signal.
In another embodiment, the present invention provides an image array device, which includes a switching unit and at least one multimedia control card. At least one multimedia control card electrically connected with the switching unit, each multimedia control card comprising a multimedia interface, a switcher circuit and a controller. The switch circuit is connected with the multimedia interface, changes the control signal from the first level to the second level, outputs the control signal through the multimedia interface, and receives a first response signal received by the multimedia interface, wherein the first response signal corresponds to the control signal. The controller is connected with the switcher circuit and identifies the connection state of the multimedia interface according to the first response signal.
In one embodiment, the present invention uses Hot Plug Detect (HPD) as a control signal, breaking the conventional way, so that the control card belonging to the multimedia signal input can also generate HPD signal, and use the communication protocol of the control card port to use the signal in the specific channel, such as: the Display Data Channel (DDC) and the differential signal channel (TMDS) are used to determine the status of the control card connection. Therefore, the use of additional elements or circuits can be reduced, and the effect of judging whether the error connection exists can be achieved.
The specific techniques employed in the present invention will be further illustrated by the following examples and accompanying drawings.
[ description of the drawings ]
Fig. 1A and 1B are schematic diagrams of a multi-port (port) multimedia switch device according to the prior art.
Fig. 2 is a schematic diagram of an HDMI transmission protocol.
FIG. 3A is a diagram of an embodiment of a multimedia control card according to the present invention.
Fig. 3B is a schematic diagram of a switch circuit according to an embodiment of the invention.
FIG. 4 is a flowchart illustrating an embodiment of a multimedia control card recognition method according to the present invention.
FIG. 5 is a diagram of another embodiment of a multimedia control card according to the present invention.
FIG. 6 is a flowchart illustrating an embodiment of identifying a connection status of a first multimedia interface according to the present invention.
Fig. 7 is a schematic diagram of a switch circuit according to an embodiment of the present invention.
FIG. 8 is a block diagram of an image array device according to an embodiment of the present invention.
Description of the main element symbols:
2. 2 a-multimedia control card; 20-a first multimedia interface; 21-a second multimedia interface; 22-a switch circuit; 220-a switching circuit; 221-a detection circuit; 222-controlling the switching element; 222a, 222 b-tangent point position; 23-a controller; 24-a comparator; 25-mode switcher; 40-array switches; 90-signal lines; 91-an application device; 91a, 91 d-multimedia signal output means; 91b, 91 c-multimedia signal input source; 92-a first level signal; 3-method; 30-35-step; 350-359-step; 4-image array device; 40-array switches; 41. 42-a computer; 43-network.
[ detailed description ] embodiments
Various exemplary embodiments may be described more fully hereinafter with reference to the accompanying drawings, in which some exemplary embodiments are shown. The inventive concept may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the inventive concept to those skilled in the art. Like numbers refer to like elements throughout. The multimedia control card, the identification method thereof and the image array device will be described in detail with reference to the drawings in the following embodiments, which are not intended to limit the invention.
Please refer to fig. 3A, which is a diagram illustrating an embodiment of a multimedia control card according to the present invention. In this embodiment, the multimedia control card 2 is made into an adapter card structure, and has a first multimedia interface 20 and a second multimedia interface 21. The first multimedia interface 20 can be an HDMI, DVI, or DisplayPort interface type, and is electrically connected to the application device 91. In the present embodiment, the first multimedia interface 20 is electrically connected to the application device 91 through the signal line 90. The second multimedia interface 21 can be connected to a switching device, such as a cross point switch (crossbar switch) in an array switch, but not limited thereto, through a flat cable or other signal transmission media. It should be noted that, in one embodiment, the port type of the first multimedia interface 20 conforms to the port type specified by the HDMI, DVI, or DisplayPort communication protocol; the port type of the second multimedia interface 21 may be, in addition to the aforementioned ways of complying with various communication protocols, encapsulated data (packet data) formed by encoding/decoding by the user. It should be noted that the type of the port can be determined according to the user's needs, and is not limited.
In one embodiment, the application device 91 may be a multimedia signal input source, such as: computers, players, etc. Alternatively, in another embodiment, the application device 91 may also be a multimedia signal output device, such as: display devices such as liquid crystal displays, light emitting diode displays, projectors, and the like.
The multimedia control card 2 further has a switch circuit 22 and a controller 23. The switch circuit 22 is electrically connected to the first multimedia interface 20 and the controller 23. Fig. 3B is a schematic diagram of a switch circuit according to an embodiment of the present invention. The switch circuit 22 includes a switch circuit 220 and a detection circuit 221. The switch circuit 220 is used for receiving the input signal and converting it into a corresponding switch signal. In one embodiment, the input signal may be a Display Data Channel (DDC) signal, and the switch signal may be a voltage level (level) signal, in one embodiment, the voltage level signal is a TTL voltage level. After receiving the switching signal, the detection circuit 221 determines the level of the switching signal and inputs the first signal level to the controller 23. In one embodiment, the switch circuit 22 may be a voltage monitor (voltage monitor), such as the TPS3823 from texas instruments, the operation of which will be described in detail later. The multimedia control card 2 further has a comparator 24, and the comparator 24 can receive the signal returned from the application device 91, determine the level thereof, and then return the determined result to the controller 23.
Please refer to fig. 3A-3B and fig. 4, wherein fig. 4 is a schematic diagram of a multimedia control card recognition method according to the present invention. Generally, in one embodiment, the multimedia control card 2 can be a control card for fixedly receiving an input source of multimedia signals, or a control card for fixedly outputting multimedia signals to a multimedia signal output device, as shown in FIG. 3A. In another embodiment, as shown in fig. 5, the multimedia control card may be a control card 2a having the above two functions, and the user sets the multimedia control card as an input control card or an output control card. In any of the above control cards, there is a possibility that the user may not notice the connection of the wrong device to the multimedia control card when using the control card. For example: the application device belonging to the image source is connected to the control card belonging to the multimedia signal output, or the application device belonging to the display is connected to the control card belonging to the multimedia signal input. It should be noted that, in the embodiment of the control card in fig. 5, there is a mode switch 25 inside the multimedia control card 2a of this type, which can make the controller 23 change the control card operation mode by way of hardware configuration or software setting, for example: the control card is set as the control card with signal input or the control card with signal output. In order to automatically determine whether the user has a wrong connection, the method of the embodiment of fig. 4 can determine whether the application device 91 connected to the multimedia control card 2 or 2a is a multimedia signal input source or a multimedia signal output device, thereby avoiding a wrong connection.
In step 30 of the method 3 shown in FIG. 4, the user connects the application device to the multimedia control card 2 arbitrarily, and it should be noted that the user does not have to distinguish whether the application device is the multimedia signal input source or the multimedia signal output device, but connects the application device 91 to the multimedia control card 2 arbitrarily. Then, in step 31, the driving switch circuit 22 changes the control signal from the first level (level) to the second level, and outputs the control signal to the application device 91 through the first multimedia interface 20. In one embodiment of this step, the control signal is a Hot Plug Detect (HPD) signal, which is generated by the controller 23, but not limited thereto. The HPD signal has two levels, a first level being a LOW Level (LOW) and a second level being a HIGH level (HIGH). In one embodiment, the control signal has a low level when entering the switch circuit 22, and the switch circuit 22 modulates the low level into a high level state, and then transmits the high level state to the application device 91 through the first multimedia interface 20 and the signal line 90. In another embodiment, the controller 23 may directly generate the high-level control signal, and then transmit the high-level control signal to the application device 91 through the first multimedia interface 20 and the signal line 90.
It should be noted that the pin of the first multimedia interface 20 for transmitting the HPD signal is different according to the interface type, if the first multimedia interface is an HDMI signal, the 19 th pin is a pin for transmitting the HPD signal, if the first multimedia interface is a DVI signal, the 16 th pin is a pin for transmitting the HPD signal, and if the first multimedia interface is a DisplayPort signal, the 18 th pin is a pin for transmitting the HPD signal. It should be noted that the signals corresponding to the pins of the various signal protocols are well known to those skilled in the art and will not be described herein.
In one embodiment of changing the signal level in step 31, as shown in FIG. 3A, the controller 23 generates the switching signal CTRL1 to the switch circuit 22, such that the control switch element 222 including the power source Vcc, the resistor R and the switch is switched to the position 222a, thereby pulling the control signal to the second level (HIGH), and when the switching signal CTRL1 switches the control switch element 222 to the position 222b, the control signal returns to the first Level (LOW). The above-mentioned embodiments can change the high/low level of the control signal. It should be noted that the manner of controlling the high and low levels can be changed by those skilled in the art according to the prior art and the knowledge thereof, and is not limited by the embodiments of the present invention.
After pulling the control signal to the second level (HIGH), step 32 transmits the control signal at the second level to the application device 91 via the first multimedia interface 20 and the transmission line 90. Then, in step 33, after the application device 91 receives the control signal with the second level, the application device 91 generates a corresponding first response signal and transmits the first response signal back to the multimedia control card 2 via the signal line 90. In one embodiment, the first response signal is a display data channel signal (DDC). Generally, in the HDMI communication protocol, the 15 th pin is responsible for transmitting DDC clock signals (DDC CLK or I2C serial clock signals), and the 16 th pin is responsible for transmitting DDC data signals (DDC data or I2C serial data signals). In this embodiment, the first response signal can be selected as a DDC clock signal.
In another embodiment, for DVI signals, the 6 th pin is generally responsible for transmitting DDC clock signals (DDC CLK), and the 7 th pin is responsible for transmitting DDC data signals (DDC data). In another embodiment, if the DDC signal is a DisplayPort signal, the auxiliary channel (AUX) of pins 15 and 17 is used to transmit the DDC frequency and data. Therefore, although the embodiment is described mainly with HDMI signals, DVI or DisplayPort, as well as other types of signals, can be implemented in accordance with the spirit.
Then, in step 34, the first multimedia interface 20 detects a first response signal corresponding to the control signal. Then, in step 35, the controller 23 determines the connection status of the first multimedia interface 20 according to the first response signal, wherein the connection status includes that the first multimedia interface 20 is in an unconnected status, or that the application device 91 connected to the first multimedia interface 20 belongs to a multimedia signal input source (or source) or a multimedia signal output device (or sink).
Please refer to fig. 6, which is a flowchart illustrating an embodiment of identifying a connection status of a first multimedia interface according to the present invention. In the present embodiment, referring to fig. 3A and fig. 3B, at first, the switch circuit 22 receives the first response signal and converts the first response signal to the first signal level in step 350. In step 350, the switch circuit 22 shown in fig. 3A and 3B is used to process and detect the signal. In the present embodiment, the switch circuit 22 includes a switch circuit 220 and a detection circuit 221. The switch circuit 220 is configured to generate a corresponding switch signal according to the first response signal, and the detection circuit is configured to detect whether a level of the switch signal is HIGH or LOW, and output a first level signal representing HIGH if the level of the switch signal is HIGH, and output a first level signal representing LOW if the level of the switch signal is LOW.
In one embodiment, the switch circuit 220 and the detection circuit 221 are integrated into a circuit device, such as: texas institute supply voltage monitor, model: TPS3823 is an example. As shown in FIG. 7, the switch circuit and the detection circuit are integrated into a TPS3823 of a device, wherein the MR pin is electrically connected to the first response signal (e.g., DDC CLK signal) pin, and the RST pin is electrically connected to the controller 23. The RST pin is used for outputting a first signal level. In one embodiment, when the MR Pin level is HIGH, i.e., there is a DDC CLK signal, the RST level is HIGH; otherwise, when the DDC CLK signal is LOW, the RST level is LOW.
After the step 350, a step 351 is performed to transmit a first signal level (HIGH or LOW) to the controller 23, and the controller 23 determines whether the application device 91 connected to the first multimedia interface 20 belongs to a multimedia signal source (source) or a display device (sink) or whether the multimedia interface is in an unconnected state, i.e., the multimedia signal source or the display device is not connected according to the first signal level. In step 351, when the first level signal 92 received by the controller 23 is in the LOW state, it indicates that the application device 91 connected to the first multimedia interface 20 is a multimedia signal input source (source terminal). The main reason is that, taking the HDMI protocol as an example, when the HPD signal is HIGH, if the multimedia signal output device (sink side) needs to respond to the related display information through the DDC channel, for example: and (4) EDID information. In one embodiment, according to the above, the DDC CLK of the DDC channel is used as the first response information, so that if the application device 91 is a multimedia signal output device, the first response signal has the DDC CLK information, and the switch circuit 22 can output HIGH. On the other hand, if the multimedia signal input source is in the state, no message is recovered, so the output of the switch circuit 22 will be in the LOW state. Based on the above-mentioned communication protocol, the controller 23 can determine whether the connection status of the first multimedia interface 20 has the multimedia signal input source connected according to the reply message.
When the first signal level of the first response signal received by the controller 23 is LOW, step 352 is performed, in which the controller 23 determines that the multimedia signal input source is connected. Then, step 353 is performed to determine whether the multimedia interface 20 is incorrectly connected according to the signal receiving function or the signal outputting function corresponding to the multimedia control card 2. As mentioned above, each multimedia control card 2 can be a control card with multimedia signal receiving function, and such control card is used to electrically connect with the multimedia signal input source; the control card may also be a control card with multimedia signal output function, for electrically connecting with a multimedia signal output device, such as a display device. In addition, a multimedia controller card has a function capable of switching setting to select a mode as a multimedia signal output function or a multimedia signal input function. Therefore, the user can select to switch any mode in a hardware or software control mode.
In step 353, when the multimedia control card is in the input mode, since the first signal level is LOW, the application device connected to the multimedia control card is a multimedia signal source device, for example: computer or DVD player, which represents the correct connection of multimedia signal input source to the multimedia control card of input function. On the contrary, if the multimedia control card is in the output mode, the first signal level is LOW, so the application device 91 connected thereto is a device of the multimedia signal input source, i.e. the multimedia control card represents that the user mistakenly connects the multimedia signal input source to the output function. In this case, the controller 23 proceeds to step initiate alarm 354 to issue a corresponding alarm message, such as: sound, light, voice or text warning message.
Referring back to step 351, when the first signal level of the first response signal received by the controller is HIGH, step 355 is performed to provide the voltage Vcc to the application device, so as to further determine whether the first multimedia interface 20 is connected to the multimedia signal output device or not. For example, the HDMI standard is supplied with voltage through the 18 th pin. If the first multimedia interface 20 is an HDMI interface, the voltage of step 355 is provided to the application device 91 via the 18 th pin. If the first multimedia interface 20 is a DVI interface, a voltage is supplied to the application device through the 14 th pin. If the first multimedia interface 20 is a DisplayPort, the voltage is supplied on the 20 th pin. After receiving the voltage signal, the application device 91 generates a corresponding second response signal, in this embodiment, the TMDS signal is used as the second response signal. The TMDS signal is a TMDS clock signal (TMDS clock) regularly, so that, in one embodiment, the clock signal in the TMDS signal can be used as the second response signal. It should be noted that the TMDS data signal (TMDS data) can also be implemented, and is not limited to the TMDS clock signal.
In step 356, the controller 23 in the multimedia control card 2 receives the second response signal from the application device 91 through the first multimedia interface 20 and determines the second response signal. Referring to FIG. 3A, the returned signal of the TMDS CLK pin of the second response signal enters the comparator 24. The comparator 24 outputs the second signal level to the controller 23 according to the state of TMDS CLK signal. Taking the HDMI signal as an example, according to the standard specification of HDMI, when there is a voltage signal VCC applied to the application device, if the application device is a multimedia signal output device (or Sink), the TMDS level of the multimedia signal output device side must be 3.3V. Therefore, the comparator 24 can determine the signal of the TMDS CLK pin, and generate the second level signal, i.e. the result processed by the comparator 24, which is provided to the controller 23 to determine what kind of the currently connected application device 91 belongs.
After the step 356, step 357 is performed, in which the controller 23 determines according to the second level signal outputted from the comparator 24, and when the level of the second level signal is HIGH, it represents that the second response signal is a TMDS CLK signal, so that the application device 91 electrically connected to the first multimedia interface 20 is determined to be a multimedia signal output device in step 358. On the contrary, when the level of the second level signal is LOW, it means that there is no second response signal, so that it is determined by step 359 that no device is connected to the first multimedia interface 20.
After either step 358 or step 359, the process returns to step 353 to determine whether there is a false positive. Taking the step 358 to the step 353 as an example, as mentioned above, the step 353 is mainly determined according to whether the multimedia control card 2 belongs to the multimedia signal receiving control card or the multimedia signal outputting control card. For example: when the multimedia control card 2 is in the output function mode, since the second signal level is HIGH, the application device 91 connected thereto is a multimedia signal output device, such as: the display device such as LCD, plasma TV, or projection device, etc. represents the multimedia control card for user to connect the multimedia signal output device to the output function correctly. On the contrary, if the multimedia control card is in the mode of the input function, since the second signal level is HIGH, the application device connected with the multimedia control card is the multimedia signal output device, and therefore, the multimedia control card connecting the multimedia signal output device to the input function by mistake represents the user. In this case, the controller 23 proceeds to step initiate alarm 354 to issue a corresponding alarm message, such as: sound, light, voice or text warning message. Similarly, for example, when the level of the second response signal received by the controller 23 is LOW in step 359 to step 353, the controller 23 determines that the first multimedia interface 20 is in a state where the application device 91 is not connected, and thus in step 353, the user is notified that the multimedia interface 20 of the control card is in a state where the multimedia interface is not connected through the warning message.
Fig. 8 is a schematic view of an image array device according to an embodiment of the invention. The video array apparatus 4 includes an array switch 40 and a plurality of multimedia control cards 2. The array switch 40 is a contact switch in one embodiment, and may be a matrix type of contact combination, such as 4x4 (i.e. 4 input ports and 4 output ports), 16x16 (i.e. 16 input ports and 16 output ports), or 32x32 (i.e. 32 input ports and 32 output ports), wherein the number of the contact combinations is not limited in the present invention. Each multimedia control card 2 can be a fixed signal source input control card or an output control card as shown in FIG. 3A. Or a multimedia control card 2a whose mode can be switched as shown in fig. 5.
In one embodiment, the image array device 4 can be set or controlled by the computer 41 at the proximal end. In another embodiment, the image array apparatus 4 can be set or controlled by a remote computer 42 via a network 43. The first multimedia interface 20 (which may be an HDMI, DVI or DisplayPort interface) of each multimedia control card 2 or 2a is used to electrically connect to a multimedia signal input source (e.g., a computer or a DVD player), and the first multimedia interface 20 can also be used to electrically connect to a multimedia signal output device (e.g., a display device such as a television or a projector). The multimedia control card 2 or 2a is electrically connected to the array switch 40 through the second multimedia interface 21, such that the array switch 4 can pair any one of the multimedia signal receiving control cards with any one of the multimedia signal output control cards through control pairing, such that the multimedia signal of the multimedia signal input source 91b or 91c received by the control card with the multimedia signal receiving function is transmitted to the control card with the multimedia signal output function through the array switch 40, and then is output to the multimedia signal output device 91a or 91 d.
Since the image array device 4 has a plurality of multimedia control cards 2 or 2a, and therefore has a plurality of first multimedia interfaces 20 for connecting with multimedia signal input sources or multimedia signal output devices, users often have wrong connection. In the image array apparatus of the present embodiment, the multimedia control card shown in fig. 3A or fig. 5 is used, and the flows shown in fig. 4 and fig. 6 are added, so that when there is a connection error, the user can be alerted to the message of the connection error, and the user can perform correction, thereby reducing the time required by the user for debugging and correcting the connection error, and improving the convenience of use.
Although the present invention has been described with reference to particular embodiments, it will be understood by those skilled in the art that various changes in form, construction, features, methods and quantities may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (14)
1. A method for identifying a multimedia control card is characterized by comprising the following steps:
the driving switcher circuit changes the control signal from the first level to the second level;
outputting the control signal by a multimedia interface;
receiving a first response signal by the multimedia interface, wherein the first response signal corresponds to the control signal; and
and identifying the connection state of the multimedia interface according to the first response signal.
2. The method as claimed in claim 1, wherein the step of identifying the connection status of the multimedia interface according to the first response signal further comprises the steps of:
receiving the first response signal by the switch circuit and converting the first response signal into a first signal level; and
and when the first signal level has a first state, identifying that the multimedia interface is connected to a multimedia signal source, and when the multimedia control card is a multimedia control card with a signal output function, generating a warning message.
3. The method as claimed in claim 1, wherein the step of identifying the connection status of the multimedia interface according to the first response signal further comprises the steps of:
receiving the first response signal by the switch circuit and converting the first response signal into a first signal level;
judging that the multimedia interface provides voltage when the first signal level has a second state;
receiving a second response signal corresponding to the voltage; and
and judging whether the multimedia interface is connected to the display equipment or is in an unconnected state according to the second response signal.
4. The method as claimed in claim 3, wherein said step of determining said multimedia interface connection status further comprises the steps of:
receiving the second response signal to generate a second signal level;
judging whether the second signal level has a third state or not, and identifying that the multimedia interface is in an unconnected state; and
and when the second signal level has a fourth state, recognizing that the multimedia interface is connected to the display equipment, and when the multimedia control card is a multimedia control card with a signal input function, generating a warning message.
5. A multimedia control card with signal receiving function or signal output function is characterized in that the multimedia control card comprises:
a multimedia interface;
a switch circuit, connected to the multimedia interface, for changing a control signal from a first level to a second level and outputting the control signal via the multimedia interface, wherein the switch circuit receives a first response signal received by the multimedia interface, and the first response signal corresponds to the control signal; and
and the controller is connected with the switcher circuit and identifies the connection state of the multimedia interface according to the first response signal.
6. The card of claim 5, wherein the switch circuit converts the first response signal to a first signal level, and identifies that the multimedia interface is connected to a multimedia signal source when the first signal level has a first state, wherein an alarm message is issued when the multimedia control card is a multimedia control card with signal output function.
7. The multimedia control card of claim 6, wherein the switch circuit further comprises:
the switching circuit generates a corresponding switching signal according to the first response signal; and
the detection circuit receives the switching signal and generates the first signal level according to the switching signal.
8. The card of claim 5, wherein the switch circuit receives the first response signal and converts the first response signal to a first signal level, and the switch circuit outputs a voltage through the multimedia interface when the first signal level has a second state.
9. The card of claim 8, further comprising a comparator for receiving a second response signal corresponding to the voltage, wherein the comparator identifies the multimedia interface as being in an unconnected state when the second signal level is determined to have a third state, and identifies the multimedia interface as being connected to the display device when the second signal level is determined to have a fourth state, and wherein the comparator sends an alert message if the multimedia interface is connected to the display device and the multimedia control card is a signal input function multimedia control card.
10. An image array device, comprising:
a switching unit; and
at least one multimedia control card electrically connected to the switching unit, each multimedia control card comprising:
a multimedia interface;
a switch circuit, connected to the multimedia interface, for changing a control signal from a first level to a second level, outputting the control signal via the multimedia interface, and receiving a first response signal received by the multimedia interface, wherein the first response signal corresponds to the control signal; and
and the controller is connected with the switcher circuit and identifies the connection state of the multimedia interface according to the first response signal.
11. The image array device of claim 10, wherein the switch circuit converts the first response signal to a first signal level and identifies that the multimedia interface is connected to a multimedia signal source when the first signal level has a first state, wherein an alarm message is issued when the multimedia control card is a multimedia control card with signal output function.
12. The image arraying device of claim 11 wherein the switch circuit further comprises:
the switching circuit generates a corresponding switching signal according to the first response signal; and
the detection circuit receives the switching signal and generates the first signal level according to the switching signal.
13. The imaging array device of claim 10, wherein the switch circuit receives the first response signal and converts the first response signal to a first signal level, and the switch circuit outputs a voltage through the multimedia interface when the first signal level has a second state.
14. The image array device of claim 13, further comprising a comparator for receiving a second response signal corresponding to the voltage, wherein the comparator is configured to identify that the multimedia interface is in an unconnected state when the second signal level is determined to have a third state, identify that the multimedia interface is connected to the display device when the second signal level is determined to have a fourth state, and send an alarm message if the multimedia control card is a multimedia control card with signal input function.
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| Application Number | Priority Date | Filing Date | Title |
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| TW108134499A TWI697206B (en) | 2019-09-24 | 2019-09-24 | Multimedia controlling adapter and method for recognizing thereof and a video matrix device using the same |
| TW108134499 | 2019-09-24 |
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| CN112637536A true CN112637536A (en) | 2021-04-09 |
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| TWI634787B (en) * | 2017-11-17 | 2018-09-01 | 宏正自動科技股份有限公司 | Apparatus and method for switching video signal |
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| TW200941288A (en) * | 2008-03-31 | 2009-10-01 | Aten Int Co Ltd | KVM switch and method capable of providing EDID of display for computer coupled thereto |
| TWI611697B (en) * | 2016-10-04 | 2018-01-11 | 神雲科技股份有限公司 | Hdmi device and method for controlling the same |
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| TWI697206B (en) | 2020-06-21 |
| CN112637536B (en) | 2024-06-07 |
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