CN109922293B - EDID equipment and conduction method of EDID information transmission channel - Google Patents
EDID equipment and conduction method of EDID information transmission channel Download PDFInfo
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Abstract
The application provides an EDID device and a conduction method of an EDID information transmission channel. An EDID device comprising: the device comprises a video signal processing conversion chip, a plurality of external interfaces for accessing external information source equipment, a switch switching module, a controller and a detection circuit; the switch switching module is connected between the external interface and the video signal processing conversion chip; the controller is connected with the switch switching module; the detection circuit is connected between a designated interface in the external interfaces and the controller; the detection circuit is used for detecting whether the designated interface is accessed to the external information source equipment or not and sending a detection result to the controller; and the controller is used for receiving the detection result from the detection circuit and controlling the switch switching module to conduct the EDID information transmission channel between one of the external interfaces and the video signal processing conversion chip according to the detection result. The EDID equipment and the EDID information transmission channel conduction method can avoid EDID information conflict caused when a plurality of external information source equipment are simultaneously connected into the EDID equipment.
Description
Technical Field
The present disclosure relates to the field of audio and video processing technologies, and in particular, to an Extended Display Identification Data (EDID) device and a method for connecting an EDID information transmission channel.
Background
In some application scenarios, a signal source acquisition video device usually accesses multiple signal source devices simultaneously. For example, in the debugging process of the hard disk video recorder, a user accesses two information source devices into the hard disk video recorder simultaneously because the user does not operate according to the requirements. At this time, in order to transmit a suitable audio/video signal to the hard disk video recorder, both the two information source devices need to acquire EDID information of the hard disk video recorder. However, when the two information source devices access the hard disk recorder simultaneously, the two information source devices read the EDID information from the hard disk recorder simultaneously, which is easy to cause EDID information conflict (that is, the two information source devices read the EDID information from the hard disk recorder simultaneously, which results in that the two information source devices cannot read correct EDID information).
Disclosure of Invention
In view of this, the present application provides an EDID device and a method for connecting an EDID information transmission channel, so as to solve the problem in the prior art that when a plurality of information source devices are simultaneously connected to a signal source acquisition video device, EDID information collision is easily caused.
A first aspect of the present application provides an EDID device, including: the device comprises a video signal processing conversion chip, a plurality of external interfaces for accessing external information source equipment, a switch switching module, a controller and a detection circuit; the switch switching module is connected between the external interface and the video signal processing conversion chip; the controller is connected with the switch switching module; the detection circuit is connected between a designated interface in the external interfaces and the controller; wherein,
the detection circuit is used for detecting whether the designated interface is accessed to external information source equipment or not and sending a detection result to the controller;
the controller is used for receiving the detection result from the detection circuit and controlling the switch switching module to conduct the EDID information transmission channel between one of the external interfaces and the video signal processing conversion chip according to the detection result.
Further, the designated interface is the interface with the highest priority in the external interfaces; the controller is specifically configured to:
when the detection result is that the designated interface is accessed to external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the designated interface and the video signal processing conversion chip;
and when the detection result indicates that the designated interface is not accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between any interface of the external interface except the designated interface and the video signal processing conversion chip.
Further, the detection circuit comprises a first resistor, a second resistor and a triode,
one end of the first resistor is connected with the designated interface, and the other end of the first resistor is connected with the base electrode of the triode;
one end of the second resistor is connected with a constant voltage source, and the other end of the second resistor is connected with the controller and the collector of the triode;
and the emitter of the triode is grounded.
Further, the designated interfaces include two of the external interfaces; the priorities of the two interfaces are different and are both greater than the priorities of the rest interfaces in the external interface; the controller is specifically configured to:
when the detection result indicates that the interface with high priority in the two interfaces is accessed to external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the interface with high priority in the specified interface and the video signal processing conversion chip;
when the detection result is that only one of the two interfaces is accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the interface accessed to the external information source equipment and the video signal processing conversion chip;
and when the detection result indicates that the two interfaces are not accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between any one of the external interfaces except the two interfaces and the video signal processing conversion chip.
Further, the detection circuit includes a first detection circuit and a second detection circuit;
the first detection circuit and the second detection circuit have the same circuit structure, and specifically include: the circuit comprises a first resistor, a second resistor and a triode;
one end of a first resistor of the first detection circuit is connected with one of the two interfaces, and one end of a first resistor of the second detection circuit is connected with the other interface;
the other ends of the first resistors of the first detection circuit and the second detection circuit are connected with the base electrode of the triode;
one end of a second resistor of the first detection circuit and the second detection circuit is connected with a constant voltage source, and the other end of the second resistor is connected with the controller and the collector of the triode;
and the emitter of the triode is grounded.
Furthermore, the controller is also connected with the video signal processing and converting chip; the controller is further configured to notify the video signal processing and converting chip of the information of the EDID information transmission channel conducted by the switch switching module, so that the video signal processing and converting chip selects an audio/video signal conversion strategy corresponding to the conducted EDID information transmission channel to convert the received audio/video signal.
A second aspect of the present application provides a method for conducting an EDID information transmission channel, the method being applied to an EDID device, the method including:
detecting whether a designated interface is accessed to external information source equipment or not;
and controlling the switch switching module to conduct an EDID information transmission channel between one of the external interfaces and the video signal processing conversion chip according to the detection result.
Further, the designating interface is an interface with the highest priority in the external interfaces, and the controlling the switch switching module according to the detection result switches on the EDID information transmission channel between one of the external interfaces and the video signal processing conversion chip includes:
when the detection result is that the designated interface is accessed to external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the designated interface and the video signal processing conversion chip;
and when the detection result indicates that the designated interface is not accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between any interface of the external interface except the designated interface and the video signal processing conversion chip.
Further, the designated interfaces include two of the external interfaces; the priorities of the two interfaces are different and are both greater than the priorities of the rest interfaces in the external interface; the EDID information transmission channel for controlling the switch switching module to conduct between one of the external interfaces and the video signal processing conversion chip according to the detection result comprises:
when the detection result indicates that the interface with high priority in the two interfaces is accessed to external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the interface with high priority in the specified interface and the video signal processing conversion chip;
when the detection result is that only one of the two interfaces is accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the interface accessed to the external information source equipment and the video signal processing conversion chip;
and when the detection result indicates that the two interfaces are not accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between any one of the external interfaces except the two interfaces and the video signal processing conversion chip.
Further, after the controlling the switch switching module to turn on the EDID information transmission channel between one of the external interfaces and the video signal processing conversion chip according to the detection result, the method further includes:
and informing the video signal processing and converting chip of the information of the EDID information transmission channel conducted by the switch switching module, so that the video signal processing and converting chip selects an audio and video signal conversion strategy corresponding to the conducted EDID information transmission channel to convert the received audio and video signals.
The application provides a conduction method of EDID equipment and EDID information transmission passageway, whether insert external information source equipment through detecting appointed interface, and then according to the EDID information transmission passageway between the interface that detection result control switch module switched on among the external interface and the video signal processing conversion chip, can guarantee that only one external interface and the EDID information transmission passageway between the video signal processing conversion chip are switched on at present, and like this, even EDID equipment inserts at present has a plurality of information source equipment, the EDID information of EDID equipment also can't be read simultaneously to these a plurality of information source equipment, the EDID information conflict that causes when can avoid inserting EDID equipment simultaneously because of a plurality of external information source equipment.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of an EDID apparatus provided in the present application;
fig. 2 is a schematic structural diagram of a second embodiment of an EDID apparatus provided in the present application;
fig. 3 is a schematic structural diagram of a third embodiment of an EDID apparatus provided in the present application;
fig. 4 is a flowchart of a first embodiment of a conduction method of an EDID information transmission channel provided in the present application.
Description of reference numerals:
1: video signal processing conversion chip:
2: an external interface;
21: a designated one of the external interfaces;
3: a switch switching module;
31: a control end of the switch switching module;
32. 33, 34, 35: an access end of the switch switching module;
4: a controller;
5: the detection circuit:
51: a first detection circuit;
52: a second detection circuit;
r1: a first resistor;
r2: a second resistor;
r3: a third resistor;
r4: a fourth resistor;
q: and a triode.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
The application provides a conduction method of EDID equipment and an EDID information transmission channel, which aims to solve the problem that EDID information conflict is easily caused when a plurality of information source equipment are simultaneously accessed into signal source acquisition video equipment in the prior art.
The technical solutions of the present application are described in detail below with specific embodiments, which may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 1 is a schematic structural diagram of a first embodiment of an EDID device provided in the present application. The EDID device may be a display device; the signal source collecting and recording device can also be a hard disk video recorder, for example. Referring to fig. 1, the EDID device provided in this embodiment includes: the device comprises a video signal processing conversion chip 1, a plurality of external interfaces 2 for accessing external information source equipment, a switch switching module 3, a controller 4 and a detection circuit 5; the switch switching module 3 is connected between the external interface 2 and the video signal processing conversion chip 1; the controller 4 is connected with the switch switching module 3; the detection circuit 5 is connected between a designated interface 21 in the external interface 2 and the controller 4; wherein,
the detection circuit 5 is used for detecting whether the designated interface 21 is accessed to the external information source equipment or not and sending a detection result to the controller 4;
and the controller 4 is configured to receive a detection result from the detection circuit 5, and control the switch switching module 3 to turn on an EDID information transmission channel between one of the external interfaces 2 and the video signal processing conversion chip 1 according to the detection result.
Specifically, referring to fig. 1, the external interface 2 is further connected to the video signal processing and converting chip 1, and is configured to transmit the received audio and video signals to the video signal processing and converting chip 1 for conversion. It should be noted that, in the structural schematic diagram shown in fig. 1, the external interface may include one or more interfaces, and a specific interface in the external interface may include one or two interfaces.
In addition, the detection circuit 5 is configured to detect whether the specified interface 21 is connected to an external source device, and send a detection result to the controller 4. Specifically, the detection result output by the detection circuit 5 when the designated interface 21 is accessed to the external source device is different from the detection result output when the designated interface 21 is not accessed to the external source device. For example, in an exemplary embodiment, when the interface 21 is specified to access an external source device, the detection circuit 5 outputs a low level; when the designated interface 21 does not access the external source device, the detection circuit 5 outputs a high level. In this way, the controller 4 may control the switch switching module 3 to turn on the EDID information transmission channel between one of the external interfaces 2 and the video signal processing conversion chip 1 according to the detection result output by the detection circuit 5.
Further, the external interface 2 is connected with the video signal processing conversion chip 1 through the switch switching module 3, the switch switching module 3 can conduct an EDID information transmission channel between one of the external interfaces 2 and the video signal processing conversion chip 1 under the control of the controller 4, so that the EDID information transmission channel between only one of the external interfaces 2 and the video signal processing conversion chip 1 can be ensured to be conducted currently, even if the EDID equipment is simultaneously accessed with a plurality of external information source devices, the EDID information stored in the video signal processing conversion chip 1 cannot be read by the plurality of external information source devices at the same time, and EDID information conflict caused when the plurality of external information source devices are simultaneously accessed into the EDID equipment can be avoided.
It should be noted that, in the EDID device provided in this embodiment, the video signal processing conversion chip 1 may identify the type of the received audio/video signal, and then select an audio/video signal conversion strategy corresponding to the type of the received audio/video signal to convert the received audio/video signal.
According to the EDID device provided by the embodiment, the switch switching module, the controller and the detection circuit are arranged, the switch switching module is connected between the external interface and the video signal processing conversion chip, the controller is connected with the switch switching module, the detection circuit is connected between the specified interface in the external interface and the controller, and the detection circuit is used for detecting whether the specified interface is connected to the external information source device or not and sending a detection result to the controller; and the controller is used for receiving the detection result from the detection circuit and controlling the switch switching module to conduct the EDID information transmission channel between one of the external interfaces and the video signal processing conversion chip according to the detection result. Therefore, the EDID information transmission channel between only one external interface and the video signal processing conversion chip can be conducted, even if the EDID equipment is currently accessed to a plurality of external information source equipment, the EDID information of the EDID equipment cannot be read by the plurality of external information source equipment, and the EDID information conflict caused when the plurality of external information source equipment are simultaneously accessed to the EDID equipment can be avoided.
Two more specific examples are given below for a detailed description of the EDID device provided herein.
Fig. 2 is a schematic structural diagram of a second embodiment of an EDID device provided by the present application. Referring to fig. 2, in the EDID device provided in this embodiment, the designated interface 21 is an interface with the highest priority in the external interfaces 2; the controller 4 is specifically configured to:
when the detection result is that the designated interface 21 is accessed to the external information source equipment, the switch switching module 3 is controlled to conduct the EDID information transmission channel between the designated interface 21 and the video signal processing conversion chip 1;
when the detection result indicates that the designated interface 21 does not access the external source device, the switch switching module 3 is controlled to conduct the EDID information transmission channel between any interface of the external interface 2 except the designated interface 21 and the video signal processing conversion chip 1.
Specifically, the priority of the external interface 2 may be set according to actual needs. When the priority of the external interface 2 is set, the priority of the external interface that supports hot plug detection is generally set to be higher than the priority of the external interface that does not support hot plug detection. For example, in one possible implementation, the EDID device includes three external interfaces, which are an HDMI interface, a DVI interface, and a VGA interface, respectively, and the priorities of the three external interfaces are, in order from high to low: HDMI interface, DVI interface and VGA interface. For another example, in another possible implementation, the EDID device includes any two of the following three interfaces: VGA interface, HDMI interface and DVI interface. At this time, the interface is designated as the highest priority one of the two external interfaces. For example, when the two interfaces include an HDMI interface, the designated interface is an HDMI interface; when the two interfaces do not comprise the HDMI interface, the designated interface is a DVI interface. For another example, in another possible implementation manner, the EDID device includes two HDMI interfaces, where the two HDMI interfaces are a first HDMI interface and a second HDMI interface, respectively, and at this time, the designated interface is the first HDMI interface.
In the embodiment shown in fig. 2, the EDID device includes two external interfaces as an example. The following description will be given taking as an example that the two external interfaces are an HDMI interface and a VGA interface, respectively (at this time, the interface with the highest priority shown in fig. 2 is an HDMI interface, that is, the designated interface is an HDMI interface, and one of the external interfaces shown in fig. 2 is a VGA interface).
In connection with the EDID device shown in fig. 2, for example, the switch switching module 3 may include a control terminal 31 and three access terminals 32, 33 and 34, wherein the control terminal 31 is connected to the controller 4, the access terminal 32 is connected to the video signal processing conversion chip 1, the access terminal 33 is connected to one of the external interfaces (in connection with the above example, the interface is a VGA interface), and the access terminal 34 is connected to the interface with the highest priority in the external interface 2 (in connection with the above example, the interface with the highest priority is an HDMI interface). At this time, the controller 4 is configured to input a control signal to the control terminal 31 according to the detection result, so as to control the connection between the access terminal 33 and the access terminal 32 of the switch switching module 3, and to conduct the EDID information transmission channel between the VGA interface and the video signal processing conversion chip 1; alternatively, the input end 34 of the control switch 3 is connected to the input end 32, so as to conduct the EDID information transmission channel between the HDMI interface and the video signal processing conversion chip 1. For example, when the detection result indicates that the designated interface 21 is connected to the external source device, the incoming terminal 34 of the switch switching module 3 is controlled to be connected to the incoming terminal 32, so that the HDMI interface is connected to the video signal processing and converting chip 1 through the switch switching module 3, that is, the EDID information transmission channel between the HDMI interface and the video signal processing and converting chip 1 is turned on. At this time, the external source device connected to the EDID device through the HDMI interface can read the EDID information stored in the video signal processing and converting chip 1 through the currently-turned-on EDID information transmission channel. For another example, when the detection result is that the designated interface 21 is not accessed to the external source device, at this time, the access terminal 33 of the switch switching module 3 is controlled to be connected to the access terminal 32, so that the VGA interface is connected to the video signal processing and converting chip 1 through the switch switching module 3, that is, the EDID information transmission channel between the VGA interface and the video signal processing and converting chip 1 is turned on. At this time, if the VGA interface is accessed to the external source device, the external source device can read the EDID information stored in the video signal processing and converting chip 1 through the currently conducted EDID information transmission channel.
It should be noted that, in the EDID device provided in this embodiment, if the EDID device includes at least three external interfaces, at this time, when the detection result indicates that the specified interface 21 does not access the external source device, and the control switch switching module 3 conducts the EDID information transmission channel between any one of the external interfaces 2 except the specified interface 21 and the video signal processing conversion chip 1, at this time, besides the specified interface 21, the EDID device further includes at least two external interfaces, and a user can set which external interface to conduct the EDID information transmission channel between the video signal processing conversion chip 1 according to actual needs, that is, any one of the interfaces is controllable. For example, in an embodiment, the EDID device includes 4 interfaces, the designated interface is an HDMI interface, and when the detection result indicates that the HDMI interface is not connected to the external source device, at this time, if the EDID device includes another HDMI interface in addition to the designated interface, the EDID device controls the control switch switching module 3 to turn on the EDID information transmission channel between the another HDMI interface and the video signal processing conversion chip 1. For another example, in another embodiment, the EDID device includes 3 interfaces, the specified interface is an HDMI interface, and when the detection result indicates that the HDMI interface is not connected to the external source device, at this time, if the EDID device includes a DVI interface in addition to the HDMI interface, the EDID device controls the control switch switching module 3 to turn on the EDID information transmission channel between the DVI interface and the video signal processing conversion chip 1.
With reference to fig. 2, optionally, in a possible implementation manner of the present application, the detection circuit 5 includes a first resistor R1, a second resistor R2, and a transistor Q, where one end of the first resistor R1 is connected to the designated interface 21, and the other end is connected to a base of the transistor Q; one end of the second resistor R2 is connected with a constant voltage source, and the other end is connected with the controller 4 and the collector of the triode Q; the emitter of the triode Q is grounded.
Specifically, two access terminals may be led out from one end of the first resistor R1, and the two access terminals are respectively connected to the PWR pin and the HPD pin of the designated interface. Further, the constant voltage source may be a 3.3V constant voltage source. Optionally, in another possible implementation manner of the present application, the detection circuit 5 further includes a third resistor R3 and a fourth resistor R4, where the third resistor R3 is connected between the PWR pin of the designated interface 21 and the first resistor R1, and the fourth resistor is connected between the collector of the transistor Q and the controller 4.
The operation of the detection circuit will be briefly described below. Specifically, when the designated interface 21 is connected to the external source device, the external source device provides a voltage of 5V to the detection circuit 5 through the PWR pin of the designated interface 21, at this time, the transistor Q is turned on, and one end of the detection circuit 5, which is connected to the controller 4, outputs a low level. Further, when the designated interface 21 does not access the external source device, at this time, the PWR pin of the designated interface 21 is at a low level, the transistor Q is turned off, and one end of the detection circuit 5 connected to the controller 4 outputs a high level. It should be noted that the HPD pin of the designated interface 21 is connected to one end of the first resistor R1, so that when the designated interface 21 is connected to the external source device, the HPD pin is at a high level, and at this time, the HPD pin of the external source device is also at a high level, and the external source device can recognize the access EDID device, and will actively read the EDID information of the EDID device.
In the EDID device provided by this embodiment, the designated interface is set as the interface with the highest priority in the external interfaces, so that when it is detected that the designated interface is accessed to the external source device, the EDID information transmission channel between the designated interface and the video signal processing conversion chip is conducted, and when it is detected that the designated interface is not accessed to the external source device, the EDID information transmission channel between any interface except the designated interface in the external interface and the video signal processing conversion chip is conducted. Therefore, the EDID information conflict can be avoided, and the EDID information transmission channel between the appointed interface and the video signal processing conversion chip can be preferentially conducted when the appointed interface is accessed to the external information source equipment, so that the external information source equipment accessed to the EDID equipment through the appointed interface can preferentially acquire the EDID information.
With reference to fig. 2, optionally, in a possible implementation manner of the present application, the controller 4 is further connected to the video signal processing and converting chip 1;
the controller 4 is further configured to notify the video signal processing and converting chip 1 of the information of the EDID information transmission channel conducted by the switch switching module 3, so that the video signal processing and converting chip 1 selects an audio/video signal conversion strategy corresponding to the conducted EDID information transmission channel to convert the received audio/video signal.
For example, the switch switching module 3 is currently connected to the EDID information transmission channel between the HDMI interface and the video signal processing and converting chip 1, and at this time, the controller 4 notifies the video signal processing and converting chip 1 of the information of the EDID information transmission channel currently connected to the switch switching module 3, so that the video signal processing and converting chip 1 selects the audio/video signal conversion strategy corresponding to the connected EDID information transmission channel to convert the received audio/video signal. For example, in this example, an audio/video signal conversion strategy suitable for the HDMI audio/video signal is selected to convert the received HDMI audio/video signal, and the received HDMI audio/video signal is converted into a standard audio/video signal.
The EDID device provided by this embodiment is connected with the video signal processing conversion chip through the controller, and thus, the controller can notify the video signal processing conversion chip of the information of the EDID information transmission channel conducted by the switch switching module, so that the video signal processing conversion chip selects the audio/video signal conversion strategy corresponding to the conducted EDID information transmission channel to convert the received audio/video signal.
Fig. 3 is a schematic structural diagram of a third embodiment of an EDID device provided by the present application. Referring to fig. 3, in the EDID device provided in this embodiment, the designated interface 21 includes two interfaces in the external interface 2; the priorities of the two interfaces are different and are both greater than the priorities of the rest interfaces in the external interface 2; the controller 4 is specifically configured to:
when the detection result indicates that the interface with the high priority in the two interfaces is accessed to the external information source equipment, the switch switching module 3 is controlled to conduct the EDID information transmission channel between the interface with the high priority in the specified interface and the video signal processing conversion chip 1;
when the detection result shows that only one of the two interfaces is accessed to the external information source equipment, the switch switching module 3 is controlled to conduct an EDID information transmission channel between the interface accessed to the external information source equipment and the video signal processing conversion chip 1;
and when the detection result indicates that the two interfaces are not accessed to the external information source equipment, the switch switching module 3 is controlled to conduct an EDID information transmission channel between any one of the external interfaces 2 except the two interfaces and the video signal processing conversion chip 1.
It should be noted that, in the embodiment shown in fig. 3, an example in which the EDID device includes three external interfaces is described. Of course, the EDID device may include other numbers of external interfaces. The following description will take an EDID device including an HDMI interface, a DVI interface, and a VGA interface as an example. At this time, the designated interface 21 is an HDMI interface (interface with the highest priority) or a DVI interface (interface with the second highest priority). Further, referring to fig. 3, the switch switching module 3 may include a control terminal 31 and four access terminals 32, 33, 34 and 35, where the control terminal 31 is connected to the controller 4, the access terminal 32 is connected to the video signal processing conversion chip 1, the access terminal 33 is connected to an interface (in this case, the priority of the interface is lower than the priority of a designated interface, for example, the interface is a VGA interface), the access terminal 35 is connected to the interface with the highest priority, and the access terminal 34 is connected to the interface with the next highest priority. At this time, the controller 4 is mainly configured to send a control instruction to the switch switching module 3 according to the detection result, so as to control the switch switching module 3 to connect any one of the access terminals 33, 34, and 35 with the access terminal 32. For example, the control switch switching module 3 connects the incoming terminal 35 with the incoming terminal 32 to conduct the EDID information transmission channel between the interface with the highest priority and the video signal processing conversion chip 1.
Specifically, in combination with the above example, for example, when it is detected that the HDMI interface is connected to the external source device (at this time, it is detected that the DVI interface is connected to the external source device or is not connected to the external source device), the control switch switching module 3 connects the access terminal 35 to the access terminal 32 to turn on the EDID information transmission channel between the HDMI interface and the video signal processing conversion chip 1. Thus, the external source device accessed through the HDMI interface can obtain the EDID information from the video signal processing conversion chip 1 through the currently conducted EDID information transmission channel. For another example, when it is detected that the HDMI interface is not connected to the external source device and the DVI interface is connected to the external source device, the switch switching module 3 is controlled to connect the access terminal 34 to the access terminal 32, so as to turn on the EDID information transmission channel between the DVI interface and the video signal processing conversion chip 1. For another example, when detecting that neither the HDMI interface nor the DVI interface is connected to the external source device, at this time, the switch switching module 3 is controlled to connect the access terminal 33 to the access terminal 32, so as to turn on the EDID information transmission channel between the VGA interface and the video signal processing and converting chip 1. At this time, if the VGA interface is accessed to the external information source device, the external information source device accessed to the EDID device through the VGA interface can obtain the EDID information through the currently conducted EDID information transmission channel.
The EDID device provided by this embodiment sets the designated interfaces to two interfaces having different priorities, but having priorities each higher than the priorities of the remaining interfaces in the external interfaces. Therefore, when the interface with high priority in the two interfaces is detected to be accessed into the external information source equipment, the EDID information transmission channel between the interface with high priority in the two interfaces and the video signal processing conversion chip can be conducted; when only one of the two interfaces is detected to be accessed into the external information source equipment, the EDID information transmission channel between the interface accessed into the external information source equipment and the video signal processing conversion chip is conducted; and when detecting that the two interfaces are not accessed into the external information source equipment, conducting an EDID information transmission channel between any one of the external interfaces except the two interfaces and the video signal processing conversion chip. Therefore, the EDID information conflict can be avoided, and the EDID information transmission channel between the appointed interface and the video signal processing conversion chip can be preferentially conducted when the appointed interface is accessed to the external information source equipment, so that the external information source equipment accessed to the EDID equipment through the appointed interface can preferentially acquire the EDID information.
Optionally, with continued reference to fig. 3, in a possible implementation manner of the present application, the detection circuit 5 includes a first detection circuit 51 and a second detection circuit 52; the first detection circuit 51 and the second detection circuit 52 have the same circuit structure, and specifically include: the circuit comprises a first resistor R1, a second resistor R2 and a triode Q; one end of the first resistor R1 of the first detection circuit 51 is connected to one of the two interfaces, and one end of the first resistor R1 of the second detection circuit 52 is connected to the other interface; the other ends of the first resistors R1 of the first detection circuit 51 and the second detection circuit 52 are connected with the base of the triode Q; one end of each of the second resistors R2 of the first detection circuit 51 and the second detection circuit 52 is connected to a constant voltage source, and the other end is connected to the controller 4 and the collector of the transistor Q; the emitter of the triode Q is grounded.
Specifically, in the embodiment shown in fig. 3, one end of the first resistor R1 of the first detection circuit 51 is connected to the interface with the highest priority, and one end of the first resistor R1 of the second detection circuit 52 is connected to the interface with the second highest priority. Further, the constant voltage source may be a 3.3V constant voltage source. Further, with reference to fig. 3, two input terminals may be led out from one end of the first resistor R1, and the two input terminals are respectively connected to the PWR pin and the HPD pin of the designated interface.
Optionally, in another possible implementation manner of the present application, the first detection circuit 51 and/or the second detection circuit 52 may further include a third resistor R3 and a fourth resistor R4, where the third resistor R3 is connected between the PWR pin of the designated interface 21 and the first resistor R1, and the fourth resistor R4 is connected between the collector of the triode Q and the controller 4.
It should be noted that the operation principle of the first detection circuit 51 and the second detection circuit 52 is the same as that of the detection circuit in the embodiment shown in fig. 2, and the description thereof is omitted here. In addition, in this embodiment, the first detection circuit 51 is configured to detect whether the interface with the highest priority is connected to the external source device, and the second detection circuit 52 is configured to detect whether the interface with the second highest priority is connected to the external source device.
Corresponding to the foregoing embodiments of the EDID device, the present application further provides embodiments of a conduction method of an EDID information transmission channel, which is applied to the EDID device provided by the present application.
Fig. 4 is a flowchart of a first embodiment of a conduction method of an EDID information transmission channel provided in the present application. Referring to fig. 4, the method for conducting the EDID information transmission channel according to this embodiment may include:
s401, detecting whether a designated interface is accessed to external information source equipment;
s402, controlling the switch switching module to conduct an EDID information transmission channel between one of the external interfaces and the video signal processing conversion chip according to the detection result.
The method provided by this embodiment is applied to the EDID device shown in fig. 1, and the implementation principle and the technical effect are similar, which are not described herein again.
The conduction method of the EDID information transmission channel provided by this embodiment is to detect whether the designated interface is accessed to the external information source device, and then control the switch switching module to conduct the EDID information transmission channel between one of the external interfaces and the video signal processing conversion chip according to the detection result, which can ensure that the EDID information transmission channel between only one external interface and the video signal processing conversion chip is conducted currently, thus, even if the EDID device is currently accessed to a plurality of external information source devices, the EDID information of the EDID device cannot be read simultaneously by the plurality of external information source devices, and EDID information collision caused when the plurality of external information source devices are simultaneously accessed to the EDID device can be avoided.
Further, the designating interface is an interface with the highest priority in the external interfaces, and the controlling the switch switching module according to the detection result switches on the EDID information transmission channel between one of the external interfaces and the video signal processing conversion chip includes:
when the detection result is that the designated interface is accessed to external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the designated interface and the video signal processing conversion chip;
and when the detection result indicates that the designated interface is not accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between any interface of the external interface except the designated interface and the video signal processing conversion chip.
The method provided by this embodiment is applied to the EDID device shown in fig. 2, and the implementation principle and the technical effect are similar, which are not described herein again.
Further, the designated interfaces include two of the external interfaces; the priorities of the two interfaces are different and are both greater than the priorities of the rest interfaces in the external interface; the EDID information transmission channel for controlling the switch switching module to conduct between one of the external interfaces and the video signal processing conversion chip according to the detection result comprises:
when the detection result indicates that the interface with high priority in the two interfaces is accessed to external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the interface with high priority in the specified interface and the video signal processing conversion chip;
when the detection result is that only one of the two interfaces is accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the interface accessed to the external information source equipment and the video signal processing conversion chip;
and when the detection result indicates that the two interfaces are not accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between any one of the external interfaces except the two interfaces and the video signal processing conversion chip.
The method provided by this embodiment may be applied to the EDID device shown in fig. 3, and the specific implementation principle and the technical effect are similar, which are not described herein again.
Further, after the controlling the switch switching module to turn on the EDID information transmission channel between one of the external interfaces and the video signal processing conversion chip according to the detection result, the method further includes:
and informing the video signal processing and converting chip of the information of the EDID information transmission channel conducted by the switch switching module, so that the video signal processing and converting chip selects an audio and video signal conversion strategy corresponding to the conducted EDID information transmission channel to convert the received audio and video signals.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An EDID device comprising: the video signal that stores EDID information handles conversion chip and a plurality of external interface that is used for inserting external information source equipment, its characterized in that, EDID equipment still includes: the device comprises a switch switching module, a controller and a detection circuit;
the switch switching module is connected between the external interface and the video signal processing conversion chip;
the controller is connected with the switch switching module;
the detection circuit is connected between a designated interface and the controller; wherein the designated interface is an interface of a plurality of external interfaces;
the detection circuit is used for detecting whether the designated interface is accessed to external information source equipment or not and sending a detection result to the controller;
the controller is used for receiving the detection result from the detection circuit and controlling the switch switching module to conduct the EDID information transmission channel between one of the external interfaces and the video signal processing conversion chip according to the detection result.
2. The apparatus of claim 1, wherein the designated interface is a highest priority one of the external interfaces; the controller is specifically configured to:
when the detection result is that the designated interface is accessed to external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the designated interface and the video signal processing conversion chip;
and when the detection result indicates that the designated interface is not accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between any interface of the external interface except the designated interface and the video signal processing conversion chip.
3. The apparatus of claim 2, wherein the detection circuit comprises a first resistor, a second resistor, and a transistor,
one end of the first resistor is connected with the designated interface, and the other end of the first resistor is connected with the base electrode of the triode;
one end of the second resistor is connected with a constant voltage source, and the other end of the second resistor is connected with the controller and the collector of the triode;
and the emitter of the triode is grounded.
4. The apparatus of claim 1, wherein the designated interface comprises two of the external interfaces; the priorities of the two interfaces are different and are both greater than the priorities of the rest interfaces in the external interface; the controller is specifically configured to:
when the detection result indicates that the interface with high priority in the two interfaces is accessed to external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the interface with high priority in the specified interface and the video signal processing conversion chip;
when the detection result is that only one of the two interfaces is accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the interface accessed to the external information source equipment and the video signal processing conversion chip;
and when the detection result indicates that the two interfaces are not accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between any one of the external interfaces except the two interfaces and the video signal processing conversion chip.
5. The apparatus of claim 4, wherein the detection circuit comprises a first detection circuit and a second detection circuit;
the first detection circuit and the second detection circuit have the same circuit structure, and specifically include: the circuit comprises a first resistor, a second resistor and a triode;
one end of a first resistor of the first detection circuit is connected with one of the two interfaces, and one end of a first resistor of the second detection circuit is connected with the other interface;
the other ends of the first resistors of the first detection circuit and the second detection circuit are connected with the base electrode of the triode;
one end of a second resistor of the first detection circuit and the second detection circuit is connected with a constant voltage source, and the other end of the second resistor is connected with the controller and the collector of the triode;
and the emitter of the triode is grounded.
6. The apparatus according to any one of claims 1 to 5, wherein the controller is further connected to the video signal processing conversion chip;
the controller is further configured to notify the video signal processing and converting chip of the information of the EDID information transmission channel conducted by the switch switching module, so that the video signal processing and converting chip selects an audio/video signal conversion strategy corresponding to the conducted EDID information transmission channel to convert the received audio/video signal.
7. A conduction method of an EDID information transmission channel, which is applied to the EDID device according to any one of claims 1 to 6, the method comprising:
detecting whether a designated interface is accessed to external information source equipment or not; the designated interface is an interface in a plurality of external interfaces for accessing external information source equipment;
and controlling a switch switching module to conduct an EDID information transmission channel between one of the external interfaces and the video signal processing conversion chip according to the detection result.
8. The method according to claim 7, wherein the designated interface is an interface with the highest priority among the external interfaces, and the controlling the switch switching module to conduct the EDID information transmission channel between one of the external interfaces and the video signal processing conversion chip according to the detection result comprises:
when the detection result is that the designated interface is accessed to external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the designated interface and the video signal processing conversion chip;
and when the detection result indicates that the designated interface is not accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between any interface of the external interface except the designated interface and the video signal processing conversion chip.
9. The method of claim 7, wherein the designated interfaces comprise two of the external interfaces; the priorities of the two interfaces are different and are both greater than the priorities of the rest interfaces in the external interface; the EDID information transmission channel for controlling the switch switching module to conduct between one of the external interfaces and the video signal processing conversion chip according to the detection result comprises:
when the detection result indicates that the interface with high priority in the two interfaces is accessed to external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the interface with high priority in the specified interface and the video signal processing conversion chip;
when the detection result is that only one of the two interfaces is accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between the interface accessed to the external information source equipment and the video signal processing conversion chip;
and when the detection result indicates that the two interfaces are not accessed to the external information source equipment, controlling the switch switching module to conduct an EDID information transmission channel between any one of the external interfaces except the two interfaces and the video signal processing conversion chip.
10. The method according to claim 7, wherein after the controlling the switching module to turn on the EDID information transmission channel between one of the external interfaces and the video signal processing conversion chip according to the detection result, the method further comprises:
and informing the video signal processing and converting chip of the information of the EDID information transmission channel conducted by the switch switching module, so that the video signal processing and converting chip selects an audio and video signal conversion strategy corresponding to the conducted EDID information transmission channel to convert the received audio and video signals.
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| CN111723040A (en) * | 2020-05-11 | 2020-09-29 | 百富计算机技术（深圳）有限公司 | USB interface switching device, switching method and terminal equipment |
| CN111694779A (en) * | 2020-06-18 | 2020-09-22 | 京东方科技集团股份有限公司 | Interface switching device, communication equipment and interface switching method |
| TWI751660B (en) * | 2020-08-26 | 2022-01-01 | 龍星顯示科技股份有限公司 | Image switching control method and image processing device |
| CN112463691B (en) * | 2020-12-04 | 2024-04-02 | 威创集团股份有限公司 | I2C-based line switching circuit and communication system |
| CN113660450A (en) * | 2021-07-27 | 2021-11-16 | 深圳市拔超科技有限公司 | Method and device for automatically switching video conference peripherals among multiple hosts |
| CN114500854B (en) * | 2022-02-28 | 2023-11-28 | 浙江水晶光电科技股份有限公司 | Camera module, control method of camera module and camera communication system |
| CN115150658A (en) * | 2022-09-01 | 2022-10-04 | 宏晶微电子科技股份有限公司 | EDID detection method, chip, VGA signal source and electronic equipment |
| CN115379280B (en) * | 2022-10-19 | 2023-01-31 | 深圳沛喆微电子有限公司 | Information source channel intercommunication transmission method and device and intelligent photo frame |
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| JP4225333B2 (en) * | 2006-08-24 | 2009-02-18 | 船井電機株式会社 | Moving picture reproducing apparatus and DVD player |
| CN102075721B (en) * | 2011-03-01 | 2012-10-03 | 利亚德光电股份有限公司 | Data stream conversion method and device, and flat panel display |
| CN103414602A (en) * | 2013-07-30 | 2013-11-27 | 硅谷数模半导体（北京）有限公司 | Testing device and testing system for testing Dongle device |
| CN104079855A (en) * | 2014-06-25 | 2014-10-01 | 西南科技大学 | Digital video device and method for reading EDID of HDMI |
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