CN202798972U - HDMI (high-definition multimedia interface) recognition circuit and television - Google Patents
HDMI (high-definition multimedia interface) recognition circuit and television Download PDFInfo
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- CN202798972U CN202798972U CN 201220475085 CN201220475085U CN202798972U CN 202798972 U CN202798972 U CN 202798972U CN 201220475085 CN201220475085 CN 201220475085 CN 201220475085 U CN201220475085 U CN 201220475085U CN 202798972 U CN202798972 U CN 202798972U
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Abstract
The utility model provides an HDMI (high-definition multimedia interface) recognition circuit and a television. The HDMI recognition circuit comprises an HDMI, a hot plug processing circuit and a control module, a hot plug signal output end of the hot plug processing circuit is connected with a 19th pin of the HDMI, a signal voltage input end of the hot plug processing circuit is connected with an 18th pin of the HDMI, an I/O (input/output) port of the control module is connected with a signal port of the hot plug processing circuit, a first port of the control module is connected with a first port of the HDMI through an I2C (inter-integrated circuit) bus, and a second port of the control module is connected with a second port of the HDMI through a data and clock signal wire. The HDMI recognition circuit and the television share the I/O port, fewer system resources are occupied, the circuit is simple, and communication is safe and reliable.
Description
Technical field
The utility model belongs to the demonstration field, relates in particular to a kind of HDMI identification circuit and television set.
Background technology
HDMI(High Definition Multimedia Interface, HDMI (High Definition Multimedia Interface)) be a kind of unpressed digital consumption electronic product interface standard, be used widely in fields such as television sets at present.The HDMI output interface of HDMI signal source all can have 5V voltage signal and hot-swappable signal.For guaranteeing that television set reliablely and stablely receives the HDMI audio and video frequency signal that signal source sends; television set and signal source need to be carried out necessary communication; mainly be the EDID(Extended Display Identification Data that signal source reads television set; the extending display identification data) and bipartite HDCP(High-bandwidth Digital Content Protection, HDCP technology) authentication.And hot-swappable signal is the prerequisite that both sides carry out communication, and according to the HDMI agreement, the hot-swappable signal of HDMI signal source must meet following provisions: when 1) EDID of television set was not readable, hot-swappable signal can not be high level; When 2) EDID of television set was readable, hot-swappable signal was necessary for high level.After hot-swappable signal was high level, signal source read EDID by DDC and carries out the HDCP authentication.Therefore the hot-swappable signal of signal source is generally controlled by TV.
The method that present hot-swappable signal is processed mainly contains 1) at signal source set handling circuit, when making signal source not access television set, force its hot-swappable signal is set to low level, and time-delay a period of time postposition is high level during the access television set.This kind method can't guarantee that for the signal source transmitting terminal each HDMI signal source transmitting terminal has adopted this technology.2) as described in the patent CN 200720078707.X, at receiving terminal hot-swappable signal is processed, but it must just can detect the HDMI signal by manual operation and inserts and provide correct hot-swappable signal, troublesome poeration; Behind the hot-swappable signal of synchronous signal source acknowledgement, when behind the TV standby again the start or the conversion of television signal passage after, hot-swappable signal condition is always constant, the hot-swappable signal that signal source detects can not change according to the variation of television set state, can not guarantee the stable of communication between signal source and the television set.3) such as patent 200720304885.X, detect with the 5V voltage of an I/O port to signal source output at receiving terminal, with another I/O port hot-swappable signal is controlled; But must use 2 I/ mouths to control, namely need more system for TV set resource; When television set ac dump or standby, the 5V voltage of signal source is shorted to ground or hot-swappable signal is in low level state simultaneously, and the HDMI signal source will enter abnormality.
For the deficiency of above-mentioned processing method, this a kind of HDMI jockey of novel proposition and television set thereof adopt an I/O port to realize and guarantee the reliably communication of HDMI signal source and television set.
The utility model content
The purpose of this utility model is to provide a kind of HDMI identification circuit, is intended to solve exist occupying system resources in the prior art insecure problem of communicating by letter more.In order to solve the problems of the technologies described above, the utility model adopts following scheme to be achieved:
A kind of HDMI identification circuit comprises:
Be used for connecting the HDMI interface of HDMI signal source;
Hot-swappable treatment circuit, the hot-swappable signal output part of described hot-swappable treatment circuit is connected with the 19th pin of described HDMI interface, and the signal voltage input of described hot-swappable treatment circuit is connected with the 18th pin of described HDMI interface;
Control module, the I/O port of described control module is connected with the signal port of described hot-swappable treatment circuit, and the first port of described control module passes through I
2The C bus is connected with the first port of described HDMI interface, and the second port of described control module is connected with the second port of described HDMI interface with clock cable by data.
Further, the hot-swappable signal output part heat outputting plug signal of described hot-swappable treatment circuit, described hot-swappable signal are at standby or ac dump and be low level when having described HDMI signal source to insert.
Further, the I/O port of described control module is input port when described HDMI signal source is not inserted, and becomes output port when described HDMI signal source is inserted.
Further, described hot-swappable treatment circuit comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first triode and the second triode;
The first termination normal working voltage of described the first resistance, the second end of described the first resistance is connected with the base stage of described the first triode, the grounded emitter of described the first triode, the collector electrode of described the first triode is connected with the first end of described the second resistance, the collector electrode of described the first triode also is connected with the base stage of described the second triode, the grounded emitter of described the second triode, the collector electrode of described the second triode is connected with the second end of described the second resistance by the 3rd resistance, and the collector electrode of described the second triode also is connected with the first end of described the 4th resistance;
The second end of described the second resistance is the signal voltage input of described hot-swappable treatment circuit; The detection signal port of the very described hot-swappable treatment circuit of the current collection of described the second triode; The second end of described the 4th resistance is the hot-swappable signal output part of described hot-swappable treatment circuit.
Preferably, described the first triode is NPN type triode.
Preferably, described the second triode is NPN type triode.
The utility model also provides a kind of television set, comprises described HDMI identification circuit.
HDMI identification circuit and television set that the utility model provides only use an I/O port, and occupying system resources is few, and circuit is simple, and can communicate by letter safely and reliably.
Description of drawings
Fig. 1 is the theory diagram of the HDMI identification circuit that provides of the utility model;
Fig. 2 is the detailed circuit diagram of the hot-swappable treatment circuit in the HDMI identification circuit that provides of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
The detailed description embodiment is as follows:
A kind of HDMI identification circuit 10 comprises:
Be used for connecting the HDMI interface 11 of HDMI signal source;
Hot-swappable treatment circuit 12, the hot-swappable signal output part of described hot-swappable treatment circuit 12 is connected with the 19th pin of described HDMI interface 11, and the signal voltage input of described hot-swappable treatment circuit 12 is connected with the 18th pin of described HDMI interface 11;
Control module 13, the I/O port P1 of described control module 13 is connected with the signal port of described hot-swappable treatment circuit 12, and the first port of described control module 13 passes through I
2The C bus is connected with the first port of described HDMI interface 11, and the second port of described control module 13 is connected with the second port of described HDMI interface 11 with clock cable by data.
Further, the hot-swappable signal output part heat outputting plug signal HPD of described hot-swappable treatment circuit 12, described hot-swappable signal HPD are at standby or ac dump and be low level when having described HDMI signal source to insert.
Further, the I/O port P1 of described control module 13 is input port when described HDMI signal source is not inserted, and becomes output port when described HDMI signal source is inserted.
Further, described hot-swappable treatment circuit 12 comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first triode Q1 and the second triode Q2;
The first termination normal working voltage VCC_NOR of described the first resistance R 1, the second end of described the first resistance R 1 is connected with the base stage of described the first triode Q1, the grounded emitter of described the first triode Q1, the collector electrode of described the first triode Q1 is connected with the first end of described the second resistance R 2, the collector electrode of described the first triode Q1 also is connected with the base stage of described the second triode Q2, the grounded emitter of described the second triode Q2, the collector electrode of described the second triode Q2 is connected with the second end of described the second resistance R 2 by the 3rd resistance R 3, and the collector electrode of described the second triode Q2 also is connected with the first end of described the 4th resistance R 4;
The second end of described the second resistance R 2 is the signal voltage input of described hot-swappable treatment circuit 12, applied signal voltage PWR; The detection signal port of the very described hot-swappable treatment circuit 12 of the current collection of described the second triode Q2, I/O detection signal DET_CON; The second end of described the 4th resistance R 4 is the hot-swappable signal output part of described hot-swappable treatment circuit 12, heat outputting plug signal HPD.
Preferably, described the first triode Q1 is NPN type triode.
Preferably, described the second triode Q2 is NPN type triode.
The utility model also provides a kind of television set, comprises described HDMI identification circuit.
The elaboration operation principle is as follows:
When HDMI interface 11 did not have the HDMI signal source to insert, the I/O port P1 of control module 13 was set to input the I/O port.
When having the HDMI signal source to insert HDMI interface 11, the HDMI signal source will be exported by the 18th pin of HDMI interface 11 the signal voltage PWR of 5V, and signal voltage PWR value is 5V.Normal working voltage VCC_NOR is high level, so that the first triode Q1 saturation conduction, the current collection of the first triode Q1 is low level very by the first resistance R 1, so that the second triode Q2 cut-off; So that detection signal DET_CON is high level, detection signal DET_CON inputs to the I/O port P1 of control module 13 to signal voltage PWR by the 3rd resistance R 3;
It is high level that control module 13 detects I/O port P1, and I/O port P1 is set to output port immediately.Control module 13 is by I/O port P1 output low level and keep above 200ms, detection signal DET_CON becomes immediately low level and keeps above 200ms, and detection signal DET_CON draws hot-swappable signal HPD for low level by the 4th resistance R 4 and keeps 200ms; When hot-swappable signal HPD was low level, the control module of television set and HDMI signal source were ready, prepared to carry out communication.Control module 13 also is maintained high level by I/O port P1 output high level always subsequently, detection signal DET_CON and hot-swappable signal HPD also become high level and are maintained high level always, and television set is connected normal the connection with the HDMI signal source: television set passes through I
2The C bus is carried the extending display identification data EDID of television set to the HDMI signal source, and carries out HDCP authentication and reception audio-video frequency content by data and clock cable with the HDMI signal source.
When the HDMI signal source was extracted from HDMI interface 11, signal voltage PWR did not have voltage; Signal voltage PWR is connected with I/O port P1 by the 3rd resistance R 3, and then I/O port P1 does not have the external voltage power supply, and control module 13 automatically I/O port P1 is set to input port.
When television set ac dump or standby, I/O port P1 is in vacant state, and the impact of not examined signal DET_CON does not affect detection signal DET_CON yet.
This moment, then signal voltage PWR magnitude of voltage was 5V when the access of HDMI signal source is arranged, and normal working voltage VCC_NOR magnitude of voltage is 0V, and then the base stage of the first triode Q1 is low level, the first triode Q1 cut-off.Signal voltage PWR passes through the second resistance R 2 so that the second triode Q2 saturation conduction, the current collection of the second triode Q2 low level very then, so that detection signal DET_CON is low level, hot-swappable signal HPD also is low level, then the HDMI signal source is in the wait standby condition always, has avoided reading the EDID of television set always but reads less than and cause that the HDMI signal source is unusual.
HDMI identification circuit and television set that the utility model provides only use an I/O port, and occupying system resources is few, and circuit is simple, and can communicate by letter safely and reliably.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (7)
1. a HDMI identification circuit is characterized in that, comprising:
Be used for connecting the HDMI interface of HDMI signal source;
Hot-swappable treatment circuit, the hot-swappable signal output part of described hot-swappable treatment circuit is connected with the 19th pin of described HDMI interface, and the signal voltage input of described hot-swappable treatment circuit is connected with the 18th pin of described HDMI interface;
Control module, the I/O port of described control module is connected with the signal port of described hot-swappable treatment circuit, and the first port of described control module passes through I
2The C bus is connected with the first port of described HDMI interface, and the second port of described control module is connected with the second port of described HDMI interface with clock cable by data.
2. HDMI identification circuit as claimed in claim 1 is characterized in that:
The hot-swappable signal output part heat outputting plug signal of described hot-swappable treatment circuit, described hot-swappable signal are low level at standby or ac dump and when having described HDMI signal source to insert.
3. HDMI identification circuit as claimed in claim 1 is characterized in that:
The I/O port of described control module is input port when described HDMI signal source is not inserted, and becomes output port when described HDMI signal source is inserted.
4. HDMI identification circuit as claimed in claim 1 is characterized in that, described hot-swappable treatment circuit comprises:
The first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first triode and the second triode;
The first termination normal working voltage of described the first resistance, the second end of described the first resistance is connected with the base stage of described the first triode, the grounded emitter of described the first triode, the collector electrode of described the first triode is connected with the first end of described the second resistance, the collector electrode of described the first triode also is connected with the base stage of described the second triode, the grounded emitter of described the second triode, the collector electrode of described the second triode is connected with the second end of described the second resistance by the 3rd resistance, and the collector electrode of described the second triode also is connected with the first end of described the 4th resistance;
The second end of described the second resistance is the signal voltage input of described hot-swappable treatment circuit; The detection signal port of the very described hot-swappable treatment circuit of the current collection of described the second triode; The second end of described the 4th resistance is the hot-swappable signal output part of described hot-swappable treatment circuit.
5. HDMI identification circuit as claimed in claim 4 is characterized in that:
Described the first triode is NPN type triode.
6. HDMI identification circuit as claimed in claim 4 is characterized in that:
Described the second triode is NPN type triode.
7. a television set is characterized in that, comprises each described HDMI identification circuit among the claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220475085 CN202798972U (en) | 2012-09-18 | 2012-09-18 | HDMI (high-definition multimedia interface) recognition circuit and television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220475085 CN202798972U (en) | 2012-09-18 | 2012-09-18 | HDMI (high-definition multimedia interface) recognition circuit and television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202798972U true CN202798972U (en) | 2013-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220475085 Expired - Fee Related CN202798972U (en) | 2012-09-18 | 2012-09-18 | HDMI (high-definition multimedia interface) recognition circuit and television |
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| Country | Link |
|---|---|
| CN (1) | CN202798972U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104661016A (en) * | 2013-11-20 | 2015-05-27 | 扬智科技股份有限公司 | Detecting method and electronic device |
| CN111818287A (en) * | 2020-07-03 | 2020-10-23 | 深圳市炬力北方微电子有限公司 | Wireless video and audio transmitter and wireless video and audio transmission method |
-
2012
- 2012-09-18 CN CN 201220475085 patent/CN202798972U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104661016A (en) * | 2013-11-20 | 2015-05-27 | 扬智科技股份有限公司 | Detecting method and electronic device |
| CN111818287A (en) * | 2020-07-03 | 2020-10-23 | 深圳市炬力北方微电子有限公司 | Wireless video and audio transmitter and wireless video and audio transmission method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20210918 |