CN106231299A - A kind of HDMI detects device - Google Patents
A kind of HDMI detects device Download PDFInfo
- Publication number
- CN106231299A CN106231299A CN201610601511.8A CN201610601511A CN106231299A CN 106231299 A CN106231299 A CN 106231299A CN 201610601511 A CN201610601511 A CN 201610601511A CN 106231299 A CN106231299 A CN 106231299A
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- China
- Prior art keywords
- hdmi
- resistance
- transistor
- input
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers
- H04N17/045—Self-contained testing apparatus
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
- H04N5/775—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television receiver
Abstract
The present invention relates to electronic communication field, particularly relate to a kind of HDMI and detect device, in order to solve HDMI of the prior art detection device in the input end problem that voltage status shakiness causes accuracy in detection to decline under off working state.The HDMI detection device of the embodiment of the present invention includes anti-tampering module, for the input voltage of the input of HDMI detection device is carried out dividing potential drop, and when input end is in off working state, transistor is in cut-off state, and when input is in running order, transistor is in the conduction state；Transistor, the anti-tampering module being connected with transistor, the detection module being connected with transistor；Detection module, the magnitude of voltage detecting voltage inputted for the input according to detection module determines whether that HDMI equipment is in running order.The HDMI detection device using the embodiment of the present invention can improve the accuracy in detection of HDMI detection device.
Description
Technical field
The present invention relates to electronic communication field, particularly relate to a kind of HDMI and detect device.
Background technology
HDMI (Hi-Definition Multimedia Interface, high-definition media interface) is currently a popular one
Plant High Speed Serial Transmission Interface, be also first transmission in single cable, the digital fine definition without compression, multichannel sound
Frequency and intelligent format and the digital interface of control command data, up to now, HDMI2.0 version can support 4Kx2K@
The resolution of 60HZ, the data being mainly used between the equipment with HDMI and display device transmit, novel on market
Intelligent television, display and computer have employed HDMI.
HDMI standard interface includes 19 holding wires altogether, and wherein HDMI equipment working state Control of Voltage line is 18 lines,
If there being HDMI equipment in running order, then HDMI equipment working state Control of Voltage line produces input voltage to HDMI
In detection device.Existing HDMI detection device is connected with HDMI equipment working state Control of Voltage line, if the work of HDMI equipment
Of-state voltage control line produces input voltage, then the output end voltage of HDMI detection device can occur respective change, and SOC detects core
By the output end voltage of detection HDMI detection device, sheet determines whether that HDMI equipment is in running order.
But, in prior art, input voltage by directly control HDMI detect transistor in device cut-off or
Person's conducting state changes the voltage status detected by SOC, finds in actual applications, if HDMI equipment is in non-
Duty, such as HDMI equipment accesses detection device but is in holding state, and the voltage of the input of HDMI detection device will
It is in low level labile state, it may appear that the fluctuation of input voltage value, if certain moment input terminal voltage has reached crystal
The conducting voltage (about 0.6V) of pipe, the outfan of HDMI detection device will be in low level state, and now SOC detects
After the low level of the outfan of HDMI detection device, HDMI equipment will be identified as in running order, cause erroneous judgement.Again
As, access without HDMI equipment, in vacant state, there is interference voltage and make input in the input end of HDMI detection device
There is instability in voltage, it is also possible to making input terminal voltage reach the conducting voltage of transistor, now SOC also can identify
HDMI equipment is in running order, causes erroneous judgement.
In sum, current HDMI detection device input end in off working state time there will be voltage status not
Surely, the accuracy in detection causing HDMI declines.
Summary of the invention
The present invention provides a kind of HDMI to detect device, in order to solve present in prior art HDMI detection device in input
The problem that the voltage status shakiness that end there will be when being in off working state causes HDMI accuracy in detection to decline.
A kind of HDMI that the embodiment of the present invention provides detects device, including:
Anti-tampering module, for carrying out dividing potential drop to the input voltage of HDMI detection device input, and at described input
When being in off working state, described transistor is in cut-off state, and when described input is in running order by described
Transistor is in the conduction state；
Transistor, the anti-tampering module being connected with described transistor, the detection module being connected with described transistor；
Detection module, the magnitude of voltage detecting voltage inputted for the input according to described detection module determines whether
HDMI equipment is in running order.
Owing to input end issuable input voltage when the off working state of HDMI detection device is less, the present invention
The anti-tampering module of embodiment can be electric to the input of input when the input end of HDMI detection equipment is in off working state
Pressure carries out dividing potential drop so that the voltage that transistor base receives is difficult to reach the conducting voltage of transistor, therefore at input end
When off working state, transistor would become hard to become conducting state from cut-off state such that it is able to improves described HDMI and detects device
Accuracy in detection.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make
Accompanying drawing briefly introduce, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for this
From the point of view of the those of ordinary skill in field, on the premise of not paying creative work, it is also possible to obtain it according to these accompanying drawings
His accompanying drawing.
The structural representation of a kind of HDMI detection device that Fig. 1 provides for the embodiment of the present invention；
The one anti-tampering modular structure schematic diagram that Fig. 2 provides for the embodiment of the present invention；
The another kind anti-tampering modular structure schematic diagram that Fig. 3 provides for the embodiment of the present invention；
The detection module structural representation that Fig. 4 provides for the embodiment of the present invention；
The circuit diagram of a kind of HDMI detection device that Fig. 5 provides for the embodiment of the present invention.
Detailed description of the invention
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing the present invention made into
One step ground describes in detail, it is clear that described embodiment is only some embodiments of the present invention rather than whole enforcement
Example.Based on the embodiment in the present invention, those of ordinary skill in the art are obtained under not making creative work premise
All other embodiments, broadly fall into the scope of protection of the invention.
Below in conjunction with Figure of description, the embodiment of the present invention is described in further detail.
As it is shown in figure 1, the embodiment of the present invention one touch control display apparatus, including:
Anti-tampering module 11, transistor 12 and detection module 13.
Anti-tampering module 11, for carrying out dividing potential drop to the input voltage of the input of HDMI detection device, and described defeated
Enter and when end is in off working state, described transistor is in cut-off state, and will when described input is in running order
Described transistor 12 is in the conduction state；
Transistor 12, for adjusting the testing result of detection module by self cut-off or conducting state；
Detection module 13, the magnitude of voltage detecting voltage inputted for the input according to described detection module judges whether
HDMI equipment is had to be inserted in described HDMI detection device and in running order.
Wherein, in off working state, the input end of HDMI detection device includes that the input end of HDMI detection device is in treating
The input end of machine state and HDMI detection device is in vacant state.The input end of HDMI detection device in holding state is
Finger has HDMI equipment to access HDMI detection device but this HDMI equipment is not in duty；The input of HDMI detection device
It is in vacant state and refers to that not having HDMI equipment to access HDMI detects device；The input of HDMI detection device is in running order
Refer to that HDMI equipment accesses HDMI detection device and this HDMI equipment in running order.
Owing to the input end of HDMI detection device is when the holding state, the input of HDMI detection device can be in shakiness
Fixed low level state, this low level magnitude of voltage is still likely to occur fluctuation and reaches the conducting voltage of transistor so that brilliant
Body pipe is in the conduction state, so that detection chip detects that low level causes erroneous judgement.It addition, HDMI detection device is defeated
Entering end when being in vacant state, HDMI detection device input receives relatively low input voltage and allows in prior art
The transistor 12 of HDMI detection device is in the conduction state, and therefore detection chip can produce erroneous judgement.And in the present invention, described anti-
Interference module 11 can carry out dividing potential drop when the input end of HDMI detection device is in off working state to the voltage of input, makes
Obtain input voltage and be difficult to reach the conducting voltage of transistor when arriving heretofore described transistor such that it is able to improve described
The accuracy in detection of HDMI detection device.
Wherein, the voltage difference between base stage and the emitter stage of transistor 12 reaches the conducting voltage of transistor and just can make
Obtaining described transistor 12 to turn on, in general, this conducting voltage is 0.6V.
There is various structures can realize the anti-tampering module 11 of the embodiment of the present invention, two kind anti-tampering modules 11 are given below
Structural representation.
Structure one is as in figure 2 it is shown, the first embodiment of anti-tampering module 11 includes HDMI measurement apparatus input 21
First resistance 22 and the second resistance 23.Wherein, described HDMI measurement apparatus input 21 is connected with one end of the first resistance 22
Connecing, the other end of described first resistance is connected with described transistor 12 and described second resistance 23 respectively, described second electricity
The other end of resistance 23 is connected with the emitter stage of described transistor 12.
Structure two is as it is shown on figure 3, the second embodiment of anti-tampering module 11 includes HDMI measurement apparatus input
21, the first resistance 22, the second resistance 23 and the 3rd resistance 24.Wherein, described HDMI measurement apparatus input 21 and described the
One end of one resistance 22 is connected, the other end of described first resistance 22 respectively with one end and the 3rd resistance 24 of the second resistance 23
One end be connected, the other end of described second resistance 23 is connected with the emitter stage of described transistor 12, described 3rd resistance
The other end of 24 is connected with the base stage of described transistor 12.
Allow for existing owing to being in the HDMI detection device input relatively low magnitude of voltage of input of off working state
In technology, the transistor of HDMI detection device is in the conduction state, in turn results in the erroneous judgement of detection module 13, and in the present invention,
Described first resistance 22 and the second resistance 23 can play when input end is in off working state and input voltage is carried out dividing potential drop
Effect so that input voltage arrive described transistor 12 base stage at time be difficult to reach the conducting voltage of transistor, it is thus possible to
Enough improve the accuracy in detection of described HDMI detection device.
Anti-tampering inside modules structure shown in above-mentioned Fig. 2 and Fig. 3 is merely illustrative, as long as being capable of anti-tampering mould
The structure of the function of block is all suitable for the anti-tampering module of the embodiment of the present invention.
As shown in Figure 4, described detection device 13 include detect voltage input end 31, the 4th resistance 32, the 5th resistance 33, with
And detection chip 34；
Wherein, described detection voltage input end 31 continues the test voltage of input high level；
The input 31 of described detection module is connected with one end of described 4th resistance 32, another of described 4th resistance 32
End be connected with one end of the 5th resistance 33 and the colelctor electrode of described transistor 12 respectively, the other end of described 5th resistance 33 and
The GPIO interface of described detection chip 34 is connected.
The detection chip 34 of the embodiment of the present invention can be SOC (System-on-a-Chip, system level chip).
Further, as it is shown in figure 5, described first resistance 22 one end in anti-tampering module 11 connects described HDMI detection
The input 21 of device, the other end of described first resistance 22 is connected with the base stage of described transistor 12 by the 3rd resistance 24,
And the other end of described first resistance 22 is connected with one end of described second resistance 23, the other end of described second resistance 23
It is connected with the emitter stage of described transistor 12, and emitter stage one end ground connection of described transistor 12, the inspection of described detection module
Survey voltage input end 31 be connected with one end of described 4th resistance 32, the other end of described 4th resistance 32 respectively with the 5th resistance
The colelctor electrode of 33 one end and described transistor 12 is connected, the other end of described 5th resistance 33 and described detection chip 34 phase
Even.
The maximum voltage value of the detection voltage that the input 31 of described detection module is inputted is not more than described detection chip
34 maximum voltage value that can load.
The maximum voltage value that general detection chip 34 can load is 3.3V.
The maximum voltage value that can load with detection chip 34 below is as 3.3V, as a example by the rated output voltage of HDMI is 5V
Illustrate.
Possible embodiment as standard is: the resistance of the first resistance 22 is 10K Ω, and the resistance of the second resistance 23 is
22K Ω, the resistance of the 3rd resistance 24 is 10K Ω, and the resistance of the 4th resistance 32 is 10K Ω, and the resistance of the 5th resistance 33 is 1K Ω.
With this understanding, through described first resistance 22 and the dividing potential drop of the second resistance 23, in running order HDMI
Decay is about 3.43V, now when the 5V voltage of detection device input 21 input is at the base stage arriving described transistor 12
Described transistor 12 will become conducting state, and the described detection chip 34 in measurement module will detect low level, measurement result
For there being HDMI equipment in running order；If the input 21 of described HDMI detection device is in holding state, described input
The voltage instability of 21, still may produce input voltage and transistor 12 is turned on, but due to described first resistance 22 and the
The existence of two resistance 23, the 0.6V input voltage that can turn on transistor 12 in existing detection equipment arrives described transistor 12
Base stage at time by decay be about 0.48V, therefore can not turn on described transistor 12, described detection chip 34 still detects height
Level, will not produce erroneous judgement；If the input 21 of described HDMI detection device is in vacant state, input 21 under vacant state
Input voltage unstable, it is possible to create transistor 12 is turned on by input voltage, but due to described first resistance 22 and second
The existence of resistance 23, the 0.6V input voltage that can turn on transistor 12 in existing detection equipment arrives described transistor 12
Time at base stage, decay being about 0.48V, therefore can not turn on the described transistor 12 in the present embodiment, described detection chip 34 is still
High level so detected, erroneous judgement will not be produced.The visible present invention detects device input end under off working state for HDMI
The capacity of resisting disturbance of testing result improves a lot, and the detection accuracy of HDMI equipment is promoted.
Above-mentioned parameter is merely illustrative one embodiment of the present invention, it is not excluded that the embodiment after amendment parameter
It is still contained in the possibility within the scope of the claims in the present invention and equivalent technologies thereof.
In the present invention, if the input 21 of described HDMI detection device is in running order, described input 21 defeated
Enter voltage and will arrive transistor 12 through anti-tampering module 11, if now the voltage of input voltage meets the conducting of transistor 12
Condition, transistor 12 will enter conducting state, and the detection voltage that the detection device input 31 in detection device 13 produces will be through
Crossing the 4th resistance 32 ground connection, now detection device output end voltage state is low level, and detection chip 34 detects that low level is then
Judge have HDMI equipment in running order；If the input 21 of described HDMI detection device is in holding state, described input
End 21 is in low level labile state, it is possible to create transistor 12 is turned on by input voltage, but due to described first resistance
22 and second existence of resistance 23, the input voltage that can turn on transistor 12 in existing detection equipment would become hard to through dividing potential drop
Transistor 12 described in conducting the present embodiment, described detection chip 34 still detects high level, and testing result is not for having HDMI
Equipment is in running order；If the input 21 of described HDMI detection device is in vacant state, do not have at described input 21
Voltage inputs, and the base stage of transistor 12 is then by the 3rd resistance 14 and the second resistance 23 ground connection, and now transistor 12 is in cut-off
State, therefore the detection chip 34 in detection module 13 is considered as the input 31 of direct and described detection module and is connected, and detects core
Sheet 34 detects high level, then testing result is not for having HDMI equipment in running order；If described HDMI detection device is defeated
Entering end 21 when being in vacant state, the be interfered impact of voltage of described input 21 produces an input voltage, but due to
First resistance 22 and the dividing potential drop effect of the second resistance 23, input voltage is extremely difficult to the electric conduction of transistor 12 after overdamping
Pressure, testing result is not for having HDMI equipment in running order.Therefore the testing result of the detection of the HDMI in the present embodiment device
The input 21 being not easily susceptible to HDMI detection device is in the impact of off working state, thus improves HDMI detection device
Detection accuracy.
Obviously, those skilled in the art can carry out various change and the modification essence without deviating from the present invention to the present invention
God and scope.So, if these amendments of the present invention and modification belong to the scope of the claims in the present invention and equivalent technologies thereof
Within, then the present invention is also intended to comprise these change and modification.
Claims (9)
1. a high-definition media interface HDMI detects device, it is characterised in that this detection device includes: transistor, with described
The anti-tampering module that transistor connects, the detection module being connected with described transistor；
Anti-tampering module, for carrying out dividing potential drop to the input voltage of the input of HDMI detection device, and at described input end
When off working state, transistor is in cut-off state, and when described input is in running order, transistor is in
Conducting state；
Detection module, the magnitude of voltage detecting voltage inputted for the input according to described detection module determines whether HDMI
Equipment is in running order.
2. HDMI as claimed in claim 1 detects device, it is characterised in that described transistor is triode transistor.
3. HDMI as claimed in claim 1 detects device, it is characterised in that described transistor is NPN type triode transistor.
4. HDMI as claimed in claim 2 detects device, it is characterised in that the input of described HDMI detection device passes through institute
State anti-tampering module to be connected with the base stage of described transistor；The colelctor electrode of described transistor is connected with described detection module.
5. HDMI as claimed in claim 4 detects device, it is characterised in that described anti-tampering module includes the first resistance and the
Two resistance；Wherein, described first resistance one end connect described input, the other end of described first resistance respectively with described crystal
The base stage of pipe and one end of described second resistance connect, and the other end of described second resistance connects with the emitter stage of described transistor
Connect.
6. HDMI as claimed in claim 4 detects device, it is characterised in that described anti-tampering module include the first resistance, the
Two resistance and the 3rd resistance；Wherein, described first resistance one end connects described input, and the other end of described first resistance is respectively
It is connected with one end of described 3rd resistance and one end of described second resistance, the other end of described second resistance and described crystal
The emitter stage of pipe connects, and the described other end of the 3rd resistance is connected with the base stage of described transistor.
7. HDMI as claimed in claim 5 detects device, it is characterised in that the grounded emitter of described transistor.
8. HDMI as claimed in claim 1 detects device, it is characterised in that described detection module include the 4th resistance, the 5th
Resistance and detection chip；
Wherein, described one end of 4th resistance is connected with the input of described detection module, and the other end of described 4th resistance divides
Not being connected with the colelctor electrode of the 5th resistance one end and described transistor, described 5th resistance is connected with described detection chip.
9. HDMI as claimed in claim 8 detects device, it is characterised in that the detection of the input input of described detection module
The maximum voltage value of voltage is not more than the maximum voltage value that described detection chip loads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610601511.8A CN106231299A (en) | 2016-07-27 | 2016-07-27 | A kind of HDMI detects device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610601511.8A CN106231299A (en) | 2016-07-27 | 2016-07-27 | A kind of HDMI detects device |
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| Publication Number | Publication Date |
|---|---|
| CN106231299A true CN106231299A (en) | 2016-12-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610601511.8A Pending CN106231299A (en) | 2016-07-27 | 2016-07-27 | A kind of HDMI detects device |
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|---|---|---|---|---|
| JP2011164943A (en) * | 2010-02-10 | 2011-08-25 | Onkyo Corp | Electronic apparatus |
| CN102281458A (en) * | 2010-05-06 | 2011-12-14 | 英特尔公司 | HDMI cable connect apparatus and method |
| CN202455095U (en) * | 2011-10-17 | 2012-09-26 | 陈悦 | Charging indicating lamp line of vehicle-mounted charger |
| CN204390954U (en) * | 2015-01-28 | 2015-06-10 | 深圳市掌讯通讯设备有限公司 | Vehicle-mounted button indicating circuit and vehicle intelligent terminal |
| CN204506783U (en) * | 2015-01-28 | 2015-07-29 | 深圳市掌讯通讯设备有限公司 | Vehicle-mounted condition indication circuit and vehicle intelligent terminal |
-
2016
- 2016-07-27 CN CN201610601511.8A patent/CN106231299A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011164943A (en) * | 2010-02-10 | 2011-08-25 | Onkyo Corp | Electronic apparatus |
| CN102281458A (en) * | 2010-05-06 | 2011-12-14 | 英特尔公司 | HDMI cable connect apparatus and method |
| CN202455095U (en) * | 2011-10-17 | 2012-09-26 | 陈悦 | Charging indicating lamp line of vehicle-mounted charger |
| CN204390954U (en) * | 2015-01-28 | 2015-06-10 | 深圳市掌讯通讯设备有限公司 | Vehicle-mounted button indicating circuit and vehicle intelligent terminal |
| CN204506783U (en) * | 2015-01-28 | 2015-07-29 | 深圳市掌讯通讯设备有限公司 | Vehicle-mounted condition indication circuit and vehicle intelligent terminal |
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