CN201403147Y - High-definition digital multimedia interface switch - Google Patents
High-definition digital multimedia interface switch Download PDFInfo
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- CN201403147Y CN201403147Y CN200820235427XU CN200820235427U CN201403147Y CN 201403147 Y CN201403147 Y CN 201403147Y CN 200820235427X U CN200820235427X U CN 200820235427XU CN 200820235427 U CN200820235427 U CN 200820235427U CN 201403147 Y CN201403147 Y CN 201403147Y
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Abstract
The utility model discloses a high-definition digital multimedia interface switch which aims to solve the technical problems that the high-definition digital multimedia interface can support multi-circuit HDMI input and the practicality of a TV set can be improved. The utility model adopts the following technical proposal: the high-definition digital multimedia interface switch comprises an MCU main control chip; the MCU main control chip is connected with an HDMI switch chip; and the HDMI switch chip is connected with more than one circuit of signal input interface and a circuit of signal output. Compared with the prior art, the HDMI switch chip which supports multi-circuit input serves as the switch of the HDMI input, so that the TV set possesses the capability of three circuits of HDMIinput, thereby improving the practicality of the TV set.
Description
Technical field
The utility model relates to a kind of multimedia interface diverter switch, especially a kind of High-definition Digital Multimedia Interface diverter switch.
Background technology
HDMI (High-definition Digital Multimedia Interface) has obtained application more and more widely as the media delivery standard of a new generation, popularizes especially in television set.The cut-in method that has its HDMI of television set of HDMI input at present has two kinds: a kind of is by being directly inputted to process chip behind the HDMI socket, and a kind of is by behind the HDMI socket, enters into process chip again through the diverter switch device.The HDMI interface must meet the HDMI standard, comprising hot plug HPD (Hot Plug Detect) signal.When HPD saltus step from low to high, the handshake of expression terminal and source end, source end and terminal begin communication.HPD signal high level is 2.4V-5.3V, and low level is 0V-0.4V, and the output impedance of HPD requires to be 1000ohms ± 20%, is directly inputted to the television set that this way of master chip relatively is fit to have only the single channel input from the HDMI socket.When if television set wants two-way or multichannel directly to import, the holding wire of each road HDMI can take a large amount of PCB areas, brings very big difficulty to wiring, and general master chip all has only a HDMI input to two-way.If use diverter switch to realize the multichannel input,, cause because the HPD signal controlling is lack of standardization that through regular meeting signal can't be discerned, the situation of screen display flower screen when when different inputs switches.
Summary of the invention
The purpose of this utility model provides a kind of High-definition Digital Multimedia Interface diverter switch, and the technical problem that solve is to make High-definition Digital Multimedia Interface can support multichannel HDMI input, increases the practicality of television set.
For solving the problems of the technologies described above, the utility model is by the following technical solutions: a kind of High-definition Digital Multimedia Interface diverter switch, comprise the MCU main control chip, described MCU main control chip is connected with HDMI and switches chip, and described HDMI switches chip and connects signal input interface and the output of one road signal more than one tunnel.
Be provided with the HDMI decoder module in the MCU main control chip of the present utility model.
The control signal of MCU main control chip of the present utility model is by three tunnel sequencing control pin S1, S2, S3 is connected switching input pin and hot-swappable (HPD_SINK) input pin that HDMI switches chip respectively with hot-swappable HPD_SINK pin, described HPD_SINK signal is at S1, S2, the S3 switching sends after finishing a period of time T (about 20-200 millisecond) again, described HDMI switches chip and also is provided with HDMI1, HDMI2 and HDMI3 three road signal input interfaces, the output that described HDMI switches chip is connected to the MCU main control chip, described HDMI switches chip and passes through HDMI1 respectively, HDMI2 is connected three road signal input interface received signals with HDMI3, and passes through HPD1, HPD2 is connected hot-swappable control signal with the HPD3 pin and controls the HDMI signal output apparatus respectively.
Supply pin on the HDMI pin of the present utility model, HPD signal pins connect first and second resistance R 1, R2 respectively, described second resistance R 2 connects the base stage of triode, the collector electrode of triode connects first resistance R 1 and HPD signal output pin, the grounded emitter of described triode.
It is PS321 that HDMI of the present utility model switches the chip model.
The resistance of first resistance R 1 of the present utility model is 1K Ω.
The utility model compared with prior art adopts the HDMI that supports the multichannel input to switch the diverter switch of chip as the HDMI input, makes the ability of TV set 3 road HDMI input, thereby has strengthened the practicality of television set.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is a high-level schematic functional block diagram of the present utility model.
Fig. 3 is the utility model HPD signal output schematic diagram.
Fig. 4 is the sequential schematic diagram of the utility model switching controls pin and HPD.
Fig. 5 is a signal switching table of the present utility model.
Embodiment
The utility model will be further described below in conjunction with drawings and Examples.
As shown in Figure 1, the utility model High-definition Digital Multimedia Interface diverter switch comprises the MCU main control chip, be provided with the HDMI decoder module in the described MCU main control chip, the control signal of MCU main control chip is by sequencing control pin S1, S2, S3 is connected switching input pin and hot-swappable (HPD_SINK) input pin that HDMI switches chip respectively with hot-swappable HPD_SINK pin, described HPD_SINK signal is at S1, S2, the S3 switching sends after finishing a period of time T (about 20-200 millisecond) again, because S1, S2, S3 also plays the effect of HPD_SINK signal allocation to corresponding HDMI input port, so at S1, S2, before S3 is not provided with correctly, HPD_SINK can't arrive the source end smoothly, described HDMI switches chip and also is provided with HDMI1, HDMI2 and HDMI3 three road signal input interfaces, the output that described HDMI switches chip connects the MCU main control chip by the HDMI1 pin, described HDMI switches chip and passes through HDMI1 respectively, HDMI2 is connected three road signal input interface received signals with HDMI3, and passes through HPD1, the hot-swappable control signal of HPD2 and HPD3 is controlled the HDMI signal output apparatus respectively.
As shown in Figure 2, be high-level schematic functional block diagram of the present utility model, under this pattern, the MCU main control chip is by control S1, S2, the S3 pin switches input channel, is 1 as S1, S2, when S3 was free position, HDMI switched chip output A1/B1 signal (being assumed to be HDMI1); Work as S1=0, S2=1, when S3 was free position, HDMI switched chip output A2/B2 signal (being assumed to be HDMI2); After specifically switching to corresponding passage as Fig. 5, must give corresponding source end (establishing television set is terminal, and DVD is the source end) the HPD signal from the low transition to the high level, both sides could begin next step communication like this.In the utility model, draw voltage to provide on the HPD signal by the source end.
As shown in Figure 3, be HPD signal output schematic diagram of the present utility model, the 18th pin of described HDMI socket is a supply pin, 19 pin are HPD signal output pin, the voltage of described supply pin input 5V, connecing resistance at supply pin 18 is 1K first resistance R 1, to satisfy the requirement of HPD output impedance in the HDMI standard.Described second resistance R 2 connects the base stage of triode, the collector electrode of triode connects first resistance R 1 and HPD signal output pin, the grounded emitter of described triode, switch by HDMI chip corresponding HPD control pin control triode conducting or end and realize the HPD signal.
As shown in Figure 4, be an embodiment of the present utility model.In the present embodiment, when TV switches to HDMI from other passage, the MCU main control chip at first is provided with S1, S2, and S3 controls PS321 and switches to respective channel.Send corresponding HPD signal to HPD_SINK then, because there is Q1 to make the one-level inverting function, and the source end must receive a signal from low to high, so the MCU main control chip must send a signal from high to low to HPD_SINK.Should be noted that, the HPD_SINK signal must be at S1, S2, the S3 switching sends after finishing a period of time T (about 20-200 millisecond) again, because S1, S2, S3 also plays the effect of HPD_SINK signal allocation to corresponding HDMI input port, so at S1, S2, before S3 is not provided with correctly, HPD_SINK can't arrive the source end smoothly.
It is PS321 that HDMI in the present embodiment switches the chip model, and according to the setting of peripheral circuit, PS321 can be operated in 5 kinds of different mode of operations.
The utility model has increased the diverter switch of PS321 as the HDMI input in television set, make the TV function possess the ability of 3 road HDMI input, thereby has strengthened the practicality of television set.
Claims (6)
1. a High-definition Digital Multimedia Interface diverter switch comprises the MCU main control chip, it is characterized in that: described MCU main control chip is connected with HDMI and switches chip, and described HDMI switches chip and connects signal input interface and the output of one road signal more than one tunnel.
2. High-definition Digital Multimedia Interface diverter switch according to claim 1 is characterized in that: be provided with the HDMI decoder module in the described MCU main control chip.
3. High-definition Digital Multimedia Interface diverter switch according to claim 2, it is characterized in that: the control signal of described MCU main control chip is by three tunnel sequencing control pin S1, S2, S3 is connected switching input pin and the hot-swappable HPD_SINK input pin that HDMI switches chip respectively with hot-swappable HPD_SINK pin, described HPD_SINK signal is at S1, S2, the S3 switching sends after finishing a period of time T again, described time T is 20 1 200 milliseconds, described HDMI switches chip and also is provided with HDMI1, HDMI2 and HDMI3 three road signal input interfaces, the output that described HDMI switches chip is connected to the MCU main control chip, described HDMI switches chip and passes through HDMI1 respectively, HDMI2 is connected three road signal input interface received signals with HDMI3, and passes through HPD1, HPD2 is connected hot-swappable control signal with the HPD3 pin and controls the HDMI signal output apparatus respectively.
4. High-definition Digital Multimedia Interface diverter switch according to claim 3, it is characterized in that: the supply pin on the described HDMI pin, HPD signal pins connect first and second resistance R 1, R2 respectively, described second resistance R 2 connects the base stage of triode, the collector electrode of triode connects first resistance R 1 and HPD signal output pin, the grounded emitter of described triode.
5. High-definition Digital Multimedia Interface diverter switch according to claim 4 is characterized in that: it is PS321 that described HDMI switches the chip model.
6. High-definition Digital Multimedia Interface diverter switch according to claim 5 is characterized in that: the resistance of described first resistance (R1) is 1K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820235427XU CN201403147Y (en) | 2008-12-19 | 2008-12-19 | High-definition digital multimedia interface switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820235427XU CN201403147Y (en) | 2008-12-19 | 2008-12-19 | High-definition digital multimedia interface switch |
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| CN201403147Y true CN201403147Y (en) | 2010-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200820235427XU Expired - Fee Related CN201403147Y (en) | 2008-12-19 | 2008-12-19 | High-definition digital multimedia interface switch |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967806A (en) * | 2015-07-28 | 2015-10-07 | 深圳市泰霖科技有限公司 | Switching circuit based on HDMI interface |
| CN107743211A (en) * | 2017-10-27 | 2018-02-27 | Tcl通力电子（惠州）有限公司 | Intelligence interface circuit and electronic equipment |
| CN109922293A (en) * | 2017-12-12 | 2019-06-21 | 杭州海康威视数字技术股份有限公司 | The conduction method of EDID equipment and EDID information transfer channel |
| JP2022098068A (en) * | 2020-12-21 | 2022-07-01 | レノボ・シンガポール・プライベート・リミテッド | Information processing device and control method |
-
2008
- 2008-12-19 CN CN200820235427XU patent/CN201403147Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967806A (en) * | 2015-07-28 | 2015-10-07 | 深圳市泰霖科技有限公司 | Switching circuit based on HDMI interface |
| CN104967806B (en) * | 2015-07-28 | 2018-03-16 | 深圳市泰霖科技有限公司 | Switching circuit based on HDMI |
| CN107743211A (en) * | 2017-10-27 | 2018-02-27 | Tcl通力电子（惠州）有限公司 | Intelligence interface circuit and electronic equipment |
| CN107743211B (en) * | 2017-10-27 | 2021-02-23 | Tcl通力电子（惠州）有限公司 | Intelligent interface circuit and electronic equipment |
| CN109922293A (en) * | 2017-12-12 | 2019-06-21 | 杭州海康威视数字技术股份有限公司 | The conduction method of EDID equipment and EDID information transfer channel |
| CN109922293B (en) * | 2017-12-12 | 2022-03-01 | 杭州海康威视数字技术股份有限公司 | EDID equipment and conduction method of EDID information transmission channel |
| JP2022098068A (en) * | 2020-12-21 | 2022-07-01 | レノボ・シンガポール・プライベート・リミテッド | Information processing device and control method |
| JP7130724B2 (en) | 2020-12-21 | 2022-09-05 | レノボ・シンガポール・プライベート・リミテッド | Information processing device, information processing system, and control method |
| US11482189B2 (en) | 2020-12-21 | 2022-10-25 | Lenovo (Singapore) Pte. Ltd. | Information processing apparatus and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100210 Termination date: 20111219 |