CN103024435A - HDMI (high-definition multimedia interface) interface detection device and method and HDMI interface system - Google Patents
HDMI (high-definition multimedia interface) interface detection device and method and HDMI interface system Download PDFInfo
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Abstract
The invention discloses HDMI (high-definition multimedia interface) interface detection device and method and an HDMI interface system. The device comprises an HDMI interface, a first switch tube and a second switch tube. A power supply end of the HDMI interface is connected with a collector of the first switch tube through a first resistor and is connected with a collector of the second switch tube through a second resistor. A hot plug detection end of the HDMI interface is connected with a hot plug detection control end of a terminal device through a third resistor and is connected with the collector of the first switch tube. An emitter of the first switch tube is earthed. A base of the first switch tube is connected with the collector of the second switch tube through a fourth resistor. The emitter of the second switch tube is earthed. A base of second switch tube is connected with a standby power supply end of the terminal device through a fifth resistor. The HDMI interface detection device and method and the HDMIN interface system save port resources of the terminal equipment effectively and can meet the requirement for input detection of multiple HDMI interfaces.
Description
Technical field
The present invention relates to the detection technique field, specially refer to HDMI interface detection apparatus, detection method and HDMI interface system.
Background technology
Along with HDMI interface (High Definition Multimedia Interface, HDMI (High Definition Multimedia Interface)) becomes DVD, set-top box, the standard configuration output interface of the source such as PC and various video players equipment, monitor, projecting apparatus, the terminal equipments such as television set just must be equipped with more HDMI interface, and the hot plug of HDMI interface done real-time detection, to satisfy when detecting the access of HDMI interface, can with the information source automatic transfer of current demonstration to rigidly connect into the HDMI information source, when perhaps the HDMI interface is pulled out, the HDMI information source automatic transfer of current demonstration can there be the information source of signal to other.
Fig. 1 is that a kind of HDMI hot plug relatively more commonly used of present terminal equipment detects (Hot Plug Detect, HPD) circuit and HDMI detection circuit for access schematic diagram.The effect that the HDMI hot plug detects is, when source equipment is connected the connection of HDMI interface with terminal equipment SoC, if terminal equipment SoC is E-EDID data (Enhanced Extended Display Identification Data all set, enhancement mode extending display identification data), and the E-EDID data are in readable state, the HPD signal that terminal equipment SoC can hold the Pin19 of HDMI interface draws from low level and is high level, after the source equipment Inspection becomes high level to the HPD signal level from low level, will be by DDC passage (the Display Data Channel of HDMI interface, the display data passage) the E-EDID data of reading terminal equipment SoC, finish the communication between source equipment and terminal equipment SoC, the audio-video signal that provides of source equipment just might pass through HDMI interface normal play on terminal equipment SoC like this.Simultaneously, the GPIO mouth of terminal equipment SoC (General Purpose Input Output, general input/output port) can be as the detection port DETECT of terminal equipment SoC, when source equipment access during to the HDMI interface, the Pin18 pin of HDMI interface can offer a HDMI-5V voltage to the DETECT port of terminal equipment SoC, this HDMI-5V voltage can be used as the HPD circuit on draw the standby power supply end of independent EEPROM device of power supply and storage E-EDID, the detection signal that also can be used as the HDMI access uses, after terminal equipment SoC detects DETECT and is high level, can determine that source equipment accesses, SoC does corresponding information source conversion according to this testing result or reminds, and is user-friendly to.
But, along with the HDMI interface quantity that the terminal equipments such as monitor, projecting apparatus, television set are equipped with is more and more, realize that the HDMI input detects, then each road HDMI interface all needs to take the GPIO mouth of a terminal equipment SoC, and the GPIO mouth quantity of SoC is always limited, often can't satisfy the functional requirement that each HDMI input detects in a lot of schemes.
Summary of the invention
Main purpose of the present invention is for providing a kind of HDMI interface detection apparatus, detection method and the HDMI interface system that can effectively save terminal equipment port resource.
The present invention proposes a kind of HDMI interface detection apparatus, be connected with terminal equipment with source equipment, comprise the HDMI interface, also comprise the first switching tube and second switch pipe, the feeder ear of described HDMI interface connects the collector electrode of described the first switching tube through the first resistance, the feeder ear of described HDMI interface connects the collector electrode of described second switch pipe through the second resistance, the hot plug that hot plug test side the 3rd resistance of described HDMI interface connects described terminal equipment detects control end, the hot plug test side of described HDMI interface also connects the collector electrode of described the first switching tube, the grounded emitter of described the first switching tube, the base stage of described the first switching tube connects the collector electrode of described second switch pipe through the 4th resistance, the grounded emitter of described second switch pipe, the base stage of described second switch pipe connect the standby power supply end of described terminal equipment through the 5th resistance.
Preferably, the resistance of described the 3rd resistance is much smaller than the resistance of described the first resistance.
Preferably, described the first switching tube and second switch pipe are triode or metal-oxide-semiconductor.
Preferably, described the first switching tube and second switch pipe are NPN type triode.
The present invention also proposes the method that a kind of HDMI of utilization interface detection apparatus realizes that the HDMI interface detects, and comprises step:
When terminal equipment is open state, and after described terminal equipment was finished the preparation of E-EDID data, described terminal equipment detected control end is switched to high input impedance by the output port of output low level input port with described hot plug;
When the HDMI interface of the described HDMI interface detection apparatus of source equipment access, the feeder ear of described HDMI interface is exported respectively the hot plug test side that high level to the hot plug of described terminal equipment detects control end and described HDMI interface, and the hot plug test side of described HDMI interface output high level is to described source equipment;
Described terminal equipment detects the high level that control end receives according to described hot plug and determines that described source equipment accesses, and described source equipment determines that according to the described high level of the hot plug test side output of described HDMI interface described terminal equipment finished the E-EDID data and prepared.
Preferably, during described HDMI interface when the described HDMI interface detection apparatus of source equipment access, the feeder ear of described HDMI interface is exported respectively the hot plug test side that high level to the hot plug of described terminal equipment detects control end and described HDMI interface, and the hot plug test side of described HDMI interface output high level also comprised to the step of described source equipment:
When terminal equipment is open state, the standby power supply end of described terminal equipment output high level, the second switch pipe conducting of described HDMI interface detection apparatus, the first switching tube cut-off of described HDMI interface detection apparatus.
Preferably, it is described when terminal equipment is open state, and after described terminal equipment was finished the E-EDID data and prepared, described terminal equipment also comprised before described hot plug is detected control end switches to high input impedance by the output port of output low level the step of input port:
When terminal equipment is open state, and before described terminal equipment is not finished the preparation of E-EDID data, the described hot plug of described terminal equipment detects the output port that control end is set to output low level, and the hot plug of described terminal equipment detects the hot plug test side of control end output low level HDMI interface to the HDMI interface detection apparatus.
Preferably, described HDMI interface detection method also comprises step:
When terminal equipment is holding state, the described hot plug of described terminal equipment detects the output port that control end is set to output low level, and the hot plug of described terminal equipment detects the hot plug test side of control end output low level HDMI interface to the HDMI interface detection apparatus.
Preferably, described HDMI interface detection method also comprises step:
When terminal equipment was off-mode, the standby power supply end of described terminal equipment was low level, the second switch pipe cut-off of described HDMI interface detection apparatus;
When the HDMI interface of the described HDMI interface detection apparatus of source equipment access, the control end of the feeder ear of described HDMI interface output high level first switching tube to the described HDMI interface detection apparatus, described the first switching tube conducting;
It is low level that the hot plug of described terminal equipment detects control end, and the hot plug test side of described HDMI interface is low level.
The present invention also proposes a kind of HDMI interface system, comprise source equipment, terminal equipment and HDMI interface detection apparatus, the HDMI interface detection apparatus is connected with terminal equipment with source equipment, whether accessed with described terminal equipment whether finished the preparation of E-EDID data for detection of described source equipment, comprise the HDMI interface, the first switching tube and second switch pipe, the feeder ear of described HDMI interface connects the collector electrode of described the first switching tube through the first resistance, the feeder ear of described HDMI interface connects the collector electrode of described second switch pipe through the second resistance, the hot plug that hot plug test side the 3rd resistance of described HDMI interface connects described terminal equipment detects control end, the hot plug test side of described HDMI interface also connects the collector electrode of described the first switching tube, the grounded emitter of described the first switching tube, the base stage of described the first switching tube connects the collector electrode of described second switch pipe through the 4th resistance, the grounded emitter of described second switch pipe, the base stage of described second switch pipe connect the standby power supply end of described terminal equipment through the 5th resistance.
The present invention detects control end by a hot plug of multiplex terminal equipment, whether realization inserts the HDMI interface to source equipment is detected (be HDMI insert detect) and whether terminal equipment is ready to the E-EDID data and detect (being that the HDMI hot plug detects) two functions, thereby effectively saved the port resource of terminal equipment, can satisfy the demand that the multi-path HDMI interfaces input detects.
Description of drawings
Fig. 1 is the circuit diagram of HDMI interface detection apparatus in the prior art;
Fig. 2 is the circuit diagram of HDMI interface detection apparatus of the present invention;
Fig. 3 is the flow chart of HDMI interface detection method the first embodiment of the present invention;
Fig. 4 is the flow chart of HDMI interface detection method the second embodiment of the present invention;
Fig. 5 is the flow chart of HDMI interface detection method the 3rd embodiment of the present invention;
Fig. 6 is the flow chart of HDMI interface detection method the 4th embodiment of the present invention;
Fig. 7 is the flow chart of HDMI interface detection method the 5th embodiment of the present invention.
The realization of the object of the invention, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 2, Fig. 2 is the circuit diagram of HDMI interface detection apparatus of the present invention.The HDMI interface detection apparatus that present embodiment is mentioned, be connected with terminal equipment SoC with source equipment (not shown), whether accessed with terminal equipment SoC whether finished the preparation of E-EDID data for detection of source equipment, the HDMI interface detection apparatus comprises the HDMI interface, the first switching tube Q1 and second switch pipe Q2, the feeder ear Pin18 of HDMI interface connects the collector electrode of the first switching tube Q1 through the first resistance R 1, the feeder ear Pin18 of HDMI interface connects the collector electrode of second switch pipe Q2 through the second resistance R 2, the hot plug test side Pin19 of HDMI interface detects control end HDMI-HPD through the hot plug that the 3rd resistance R 3 connects terminal equipment SoC, the hot plug test side Pin19 of HDMI interface also connects the collector electrode of the first switching tube Q1, the grounded emitter of the first switching tube Q1, the base stage of the first switching tube Q1 connects the collector electrode of second switch pipe Q2 through the 4th resistance R 4, the grounded emitter of second switch pipe Q2, the base stage of second switch pipe Q2 connect the standby power supply end STB of terminal equipment SoC through the 5th resistance R 5.Wherein, the resistance of the 3rd resistance R 3 is much smaller than the resistance of the first resistance R 1, standby power supply end STB can be 3.3VSTB or 5VSTB, the first switching tube Q1 and second switch pipe Q2 are triode or metal-oxide-semiconductor, present embodiment take standby power supply end STB as 3.3VSTB, the first switching tube Q1 and second switch pipe Q2 as NPN type triode as example.
When terminal equipment SoC is off-mode, the HDMI-HPD pin is not subjected to the control of terminal equipment SoC, the standby power supply end STB Non voltage output of terminal equipment SoC, the Q2 cut-off, if source equipment access HDMI interface under this state, the voltage of Pin18 port sets high the base stage of Q1 by R2 and R4, the Q1 conducting, the current collection of Q1 is low level very, and holding with the direct-connected Pin19 of collector electrode also is low level, and source equipment can not carry out data communication with terminal equipment SoC.
When terminal equipment SoC started shooting, the E-EDID data were not yet ready, and at this moment, terminal equipment SoC is initialized as low level output with HDMI-HPD, then Pin19 pin output low level.After terminal equipment SoC finished the preparation of E-EDID data, terminal equipment SoC was made as HDMI-HPD the input port of high input impedance.Simultaneously, 3.3VSTB exports high level, draw on the base stage with Q2, and the Q2 conducting, the current collection of Q2 is low level very, and then the base stage of Q1 also is low level, the Q1 cut-off.If source equipment access HDMI interface under this state, Pin18 exports respectively high level to HDMI-HPD and Pin19 pin, the high level that terminal equipment SoC receives according to the HDMI-HPD termination determines that source equipment accesses, source equipment determines that according to the high level of Pin19 pin output terminal equipment SoC has finished the E-EDID data and prepared, at this moment, source equipment can carry out proper communication with terminal equipment SoC, source equipment reads the E-EDID data by the DDC passage from terminal equipment SoC, send audio-video signal to terminal equipment SoC, the audio-video frequency content of terminal equipment SoC normal play source equipment output.In addition, for general terminal equipment SoC, from power on start is answered long enough to the time that HDMI-HPD is made as the high input impedance input, for example, greater than 100ms, if not enough 100ms, can do delay process, make it greater than 100ms, like this, in start process, the source equipment that inserts can detect by the variation of low level to high level by the Pin19 pin of HDMI interface, and source equipment reads the E-EDID data by the DDC passage from terminal equipment SoC, and finishes data communication between the terminal equipment SoC, and to terminal equipment SoC output audio-video frequency content, terminal equipment SoC gets final product the audio-video frequency content of normal play source equipment output.
SoC remains on open state when terminal equipment, because terminal equipment SoC has been ready to the E-EDID data, SoC all the time HDMI-HPD pin is set to the high input impedance input port, when source equipment access HDMI interface, the current collection of Q1 is high level very, it is high level that source equipment detects the Pin19 pin at once, directly read the E-EDID data from terminal equipment SoC, data communication between finishing equipment, and exporting audio-video frequency content to SoC, terminal equipment SoC gets final product the audio-video frequency content of normal play source equipment output.Simultaneously, when the source equipment access, the Pin18 end produces high level output to the HDMI-HPD pin, terminal equipment SoC detects high level by the HDMI-HPD pin, can determine that source equipment inputted the HDMI port, realize that a multiplexing HDMI-HPD pin inserts detection as HDMI and hot plug detects two functions uses, thereby save the port resource of terminal equipment SoC.
When terminal equipment SoC enters holding state, SoC HDMI-HPD pin is set to low level output, the HDMI-HPD output low level is to the Pin19 pin, source equipment is behind access HDMI interface, receive low level by the Pin19 pin, source equipment can not carry out data communication with terminal equipment SoC.
Present embodiment detects control end by the hot plug of multiplex terminal equipment SoC, whether realization inserts the HDMI interface to source equipment is detected (be HDMI insert detect) and whether terminal equipment SoC is ready to the E-EDID data and detect (being that the HDMI hot plug detects) two functions, thereby effectively saved the port resource of terminal equipment SoC, can satisfy the demand that the multi-path HDMI interfaces input detects.
The present invention also proposes a kind of HDMI interface system, comprise source equipment, terminal equipment and HDMI interface detection apparatus, wherein, the HDMI interface detection apparatus is connected with terminal equipment with source equipment, whether accessed with terminal equipment whether finished the preparation of E-EDID data for detection of source equipment, comprise the HDMI interface, the first switching tube and second switch pipe, the feeder ear of HDMI interface connects the collector electrode of the first switching tube through the first resistance, the feeder ear of HDMI interface connects the collector electrode of second switch pipe through the second resistance, the hot plug that hot plug test side the 3rd resistance of HDMI interface connects terminal equipment detects control end, the hot plug test side of HDMI interface also connects the collector electrode of the first switching tube, the grounded emitter of the first switching tube, the base stage of the first switching tube connects the collector electrode of second switch pipe through the 4th resistance, the grounded emitter of second switch pipe, the base stage of second switch pipe connect the standby power supply end of terminal equipment through the 5th resistance.
The HDMI interface detection apparatus that comprises in the HDMI interface system of present embodiment can comprise aforementioned all technical schemes in embodiment illustrated in fig. 2, and its detailed circuit structure and operation principle can be with reference to previous embodiment, and therefore not to repeat here.Owing to adopted the HDMI interface detection apparatus in the previous embodiment, the HDMI interface system of present embodiment is with respect to traditional HDMI interface system, a hot plug by multiplex terminal equipment detects control end, whether realization inserts the HDMI interface to source equipment is detected (be HDMI insert detect) and whether terminal equipment is ready to the E-EDID data and detect (being that the HDMI hot plug detects) two functions, thereby effectively saved the port resource of terminal equipment, can satisfy the demand that the multi-path HDMI interfaces input detects.
The embodiment of HDMI interface detection method among following Fig. 3 to Fig. 7 describes in conjunction with the circuit diagram of device embodiment shown in Figure 2.
As shown in Figure 3, Fig. 3 is the flow chart of HDMI interface detection method the first embodiment of the present invention.The HDMI interface detection method that present embodiment is mentioned utilizes the HDMI interface detection apparatus in embodiment illustrated in fig. 2 to realize, comprises step:
Step S10, when terminal equipment SoC is open state, and after terminal equipment SoC finished the preparation of E-EDID data, terminal equipment SoC detected control end HDMI-HPD is switched to high input impedance by the output port of output low level input port with hot plug;
Step S20, when the HDMI interface of source equipment access HDMI interface detection apparatus, the feeder ear of HDMI interface is exported respectively the hot plug test side that high level to the hot plug of terminal equipment detects control end and HDMI interface, and the hot plug test side of HDMI interface output high level is to source equipment;
Step S30, terminal equipment SoC determines that according to the high level that hot plug detection control end HDMI-HPD receives source equipment accesses, and source equipment determines that according to the high level of the hot plug test side Pin19 output of HDMI interface terminal equipment SoC has finished the E-EDID data and prepared.
As terminal equipment SoC during at open state, and after terminal equipment SoC finished the E-EDID data and prepares, terminal equipment SoC was made as HDMI-HPD the input port of high input impedance.When source equipment access HDMI interface, Pin18 exports respectively high level to HDMI-HPD and Pin19 pin, the source equipment Inspection is high level to the Pin19 pin, read the E-EDID data from terminal equipment SoC, data communication between finishing equipment, and exporting audio-video frequency content to SoC, terminal equipment SoC gets final product the audio-video frequency content of normal play source equipment output.Simultaneously, when the source equipment access, the Pin18 end produces high level output to the HDMI-HPD pin, terminal equipment SoC detects high level by the HDMI-HPD pin, can determine that source equipment inputted the HDMI port, realize that a multiplexing HDMI-HPD pin inserts detection as HDMI and hot plug detects two functions uses, thereby save the port resource of terminal equipment SoC.
As shown in Figure 4, Fig. 4 is the flow chart of HDMI interface detection method the second embodiment of the present invention.Present embodiment had increased step S21 before step S20 on basis embodiment illustrated in fig. 3, its content is:
Step S21, when terminal equipment SoC was open state, the standby power supply end STB of terminal equipment SoC exported high level, the second switch pipe Q2 conducting of HDMI interface detection apparatus, the first switching tube Q1 cut-off of HDMI interface detection apparatus.
When terminal equipment SoC was open state, 3.3VSTB exported high level, draw on the base stage with Q2, and the Q2 conducting, the current collection of Q2 is low level very, and then the base stage of Q1 also is low level, the Q1 cut-off.If source equipment access HDMI interface under this state, Pin18 exports respectively high level to HDMI-HPD and Pin19 pin, the high level that terminal equipment SoC receives according to the HDMI-HPD termination determines that source equipment accesses, source equipment determines that according to the high level of Pin19 pin output terminal equipment SoC has finished the E-EDID data and prepared, at this moment, source equipment can carry out proper communication with terminal equipment SoC, source equipment reads the E-EDID data by the DDC passage from terminal equipment SoC, send audio-video signal to terminal equipment SoC, the audio-video frequency content of terminal equipment SoC normal play source equipment output.
As shown in Figure 5, Fig. 5 is the flow chart of HDMI interface detection method the 3rd embodiment of the present invention.Present embodiment had increased step S11 before step S10 on basis embodiment illustrated in fig. 3, its content is:
Step S11, when terminal equipment SoC is open state, and before terminal equipment SoC does not finish the preparation of E-EDID data, terminal equipment SoC hot plug detects the output port that control end HDMI-HPD is set to output low level, and the hot plug of terminal equipment SoC detects the hot plug test side Pin19 of control end HDMI-HPD output low level HDMI interface to the HDMI interface detection apparatus.
When terminal equipment SoC started shooting, the E-EDID data were not yet ready, and at this moment, terminal equipment SoC is initialized as low level output with HDMI-HPD, then Pin19 pin output low level.In addition, for general terminal equipment SoC, from power on start is answered long enough to the time that HDMI-HPD is made as the high input impedance input, for example, greater than 100ms, if not enough 100ms, can do delay process, make it greater than 100ms, like this, in start process, the source equipment that inserts can detect by the variation of low level to high level by the Pin19 pin of HDMI interface, and source equipment reads the E-EDID data by the DDC passage from terminal equipment SoC, and finishes data communication between the terminal equipment SoC, and to terminal equipment SoC output audio-video frequency content, terminal equipment SoC gets final product the audio-video frequency content of normal play source equipment output.
As shown in Figure 6, Fig. 6 is the flow chart of HDMI interface detection method the 4th embodiment of the present invention.The HDMI interface detection method also comprises:
Step S40, when terminal equipment SoC is holding state, terminal equipment SoC hot plug detects the output port that control end HDMI-HPD is set to output low level, and the hot plug of terminal equipment SoC detects the hot plug test side Pin19 of control end HDMI-HPD output low level HDMI interface to the HDMI interface detection apparatus.
When terminal equipment SoC enters holding state, SoC HDMI-HPD pin is set to low level output, the HDMI-HPD output low level is to the Pin19 pin, source equipment is behind access HDMI interface, receive low level by the Pin19 pin, source equipment can not carry out data communication with terminal equipment SoC.
As shown in Figure 7, Fig. 7 is the flow chart of HDMI interface detection method the 5th embodiment of the present invention.The HDMI interface detection method also comprises:
Step S51, when terminal equipment SoC was off-mode, the standby power supply end STB of terminal equipment SoC was low level, the second switch pipe Q2 cut-off of HDMI interface detection apparatus;
Step S52, when the HDMI interface of source equipment access HDMI interface detection apparatus, the control end of the feeder ear of HDMI interface output high level first switching tube to the HDMI interface detection apparatus, the first switching tube Q1 conducting;
Step S53, it is low level that the hot plug of terminal equipment SoC detects control end HDMI-HPD, the hot plug test side Pin19 of HDMI interface is low level.
When terminal equipment SoC is off-mode, the HDMI-HPD pin is not subjected to the control of terminal equipment SoC, the standby power supply end STB Non voltage output of terminal equipment SoC, the Q2 cut-off, if source equipment access HDMI interface under this state, the voltage of Pin18 port sets high the base stage of Q1 by R2 and R8, the Q1 conducting, the current collection of Q1 is low level very, and holding with the direct-connected Pin19 of collector electrode also is low level, and source equipment can not carry out data communication with terminal equipment SoC.
Below only be the preferred embodiments of the present invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. HDMI interface detection apparatus, be connected with terminal equipment with source equipment, comprise the HDMI interface, it is characterized in that, also comprise the first switching tube and second switch pipe, the feeder ear of described HDMI interface connects the collector electrode of described the first switching tube through the first resistance, the feeder ear of described HDMI interface connects the collector electrode of described second switch pipe through the second resistance, the hot plug that hot plug test side the 3rd resistance of described HDMI interface connects described terminal equipment detects control end, the hot plug test side of described HDMI interface also connects the collector electrode of described the first switching tube, the grounded emitter of described the first switching tube, the base stage of described the first switching tube connects the collector electrode of described second switch pipe through the 4th resistance, the grounded emitter of described second switch pipe, the base stage of described second switch pipe connect the standby power supply end of described terminal equipment through the 5th resistance.
2. HDMI interface detection apparatus according to claim 1 is characterized in that, the resistance of described the 3rd resistance is much smaller than the resistance of described the first resistance.
3. HDMI interface detection apparatus according to claim 1 is characterized in that, described the first switching tube and second switch pipe are triode or metal-oxide-semiconductor.
4. HDMI interface detection apparatus according to claim 3 is characterized in that, described the first switching tube and second switch pipe are NPN type triode.
5. one kind is utilized the HDMI interface detection apparatus to realize the method that the HDMI interface detects, and it is characterized in that, comprises step:
When terminal equipment is open state, and after described terminal equipment was finished the preparation of E-EDID data, described terminal equipment detected control end is switched to high input impedance by the output port of output low level input port with described hot plug;
When the HDMI interface of the described HDMI interface detection apparatus of source equipment access, the feeder ear of described HDMI interface is exported respectively the hot plug test side that high level to the hot plug of described terminal equipment detects control end and described HDMI interface, and the hot plug test side of described HDMI interface output high level is to described source equipment;
Described terminal equipment detects the high level that control end receives according to described hot plug and determines that described source equipment accesses, and described source equipment determines that according to the described high level of the hot plug test side output of described HDMI interface described terminal equipment finished the E-EDID data and prepared.
6. HDMI interface detection method according to claim 5, it is characterized in that, during described HDMI interface when the described HDMI interface detection apparatus of source equipment access, the feeder ear of described HDMI interface is exported respectively the hot plug test side that high level to the hot plug of described terminal equipment detects control end and described HDMI interface, and the hot plug test side of described HDMI interface output high level also comprised to the step of described source equipment:
When terminal equipment is open state, the standby power supply end of described terminal equipment output high level, the second switch pipe conducting of described HDMI interface detection apparatus, the first switching tube cut-off of described HDMI interface detection apparatus.
7. HDMI interface detection method according to claim 5, it is characterized in that, it is described when terminal equipment is open state, and after described terminal equipment was finished the E-EDID data and prepared, described terminal equipment also comprised before described hot plug is detected control end switches to high input impedance by the output port of output low level the step of input port:
When terminal equipment is open state, and before described terminal equipment is not finished the preparation of E-EDID data, the described hot plug of described terminal equipment detects the output port that control end is set to output low level, and the hot plug of described terminal equipment detects the hot plug test side of control end output low level HDMI interface to the HDMI interface detection apparatus.
8. according to claim 5 to 7 each described HDMI interface detection methods, it is characterized in that, also comprise step:
When terminal equipment is holding state, the described hot plug of described terminal equipment detects the output port that control end is set to output low level, and the hot plug of described terminal equipment detects the hot plug test side of control end output low level HDMI interface to the HDMI interface detection apparatus.
9. according to claim 5 to 7 each described HDMI interface detection methods, it is characterized in that, also comprise step:
When terminal equipment was off-mode, the standby power supply end of described terminal equipment was low level, the second switch pipe cut-off of described HDMI interface detection apparatus;
When the HDMI interface of the described HDMI interface detection apparatus of source equipment access, the control end of the feeder ear of described HDMI interface output high level first switching tube to the described HDMI interface detection apparatus, described the first switching tube conducting;
It is low level that the hot plug of described terminal equipment detects control end, and the hot plug test side of described HDMI interface is low level.
10. a HDMI interface system comprises source equipment and terminal equipment, it is characterized in that, also comprises such as each described HDMI interface detection apparatus of claim 1 to 4.
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| CN103414913A (en) * | 2013-05-14 | 2013-11-27 | 杨玉峰 | HDMI signal generator with EDID and HDCP-KEY detection functions and signal distributor |
| CN103577289A (en) * | 2013-10-18 | 2014-02-12 | 青岛歌尔声学科技有限公司 | HDMI (high-definition multimedia interface)-based hot plug detection circuit and multimedia data transmission system using same |
| CN104219519A (en) * | 2014-09-16 | 2014-12-17 | 硅谷数模半导体（北京）有限公司 | Testing adapter plate, system and method of audio and video interface |
| CN104333715A (en) * | 2014-11-27 | 2015-02-04 | 天津天地伟业数码科技有限公司 | Switching method for evidence input and local video input |
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