CN203522947U - Multi-path HDMI (high-definition multimedia interface) signal source output circuit and HDMI signal source device - Google Patents
Multi-path HDMI (high-definition multimedia interface) signal source output circuit and HDMI signal source device Download PDFInfo
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- CN203522947U CN203522947U CN201320523085.2U CN201320523085U CN203522947U CN 203522947 U CN203522947 U CN 203522947U CN 201320523085 U CN201320523085 U CN 201320523085U CN 203522947 U CN203522947 U CN 203522947U
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Abstract
The utility model discloses a multi-path HDMI (high-definition multimedia interface) signal source output circuit and an HDMI signal source device. The multi-path HDMI signal source output circuit is connected with a storage and the HDMI device respectively, and comprises a USB (universal serial bus) interface, an audio/video processor, an HDMI distributor, a microcontroller, a channel multiplexing module and an HDMI interface module. According to the multi-path HDMI signal source output circuit disclosed by the utility model, contents in the storage are directly read and decoded by the audio/video processor, HDMI signals are output as a signal source, and one path of the HDMI signals is distributed by the HDMI distributor to output multi-path HDMI signals. According to the multi-path HDMI signal source output circuit and the HDMI signal source device disclosed by the utility model, the signal source can be acquired without the need of playing a disk by a DVD (digital video disk) or playing disks by multiple DVDs simultaneously, thus reducing the quantity of the HDMI signal source devices, simplifying an acquisition mechanism for the signal source, decreasing production and maintenance costs, and facilitating carrying and installation for the HDMI signal source device.
Description
Technical field
The utility model relates to interface testing technical field, relates in particular to a kind of multichannel HDMI signal source output circuit and HDMI source device.
Background technology
Audio frequency apparatus Audio and SounderBar have 2 to 4 HDMI(HighDefinition Multimedia Interface, HDMI (High Definition Multimedia Interface)) signal input port.At present, when the test decoding deck of Audio, SounderBar or complete machine, whether normally need to test each HDMI signal input port function.Conventionally there are two kinds of testing schemes:
A, with 2 to 4 source devices with HDMI output function, as DVD(Digital Video Disc, digital video disk) play video disc simultaneously, as signal source, output HDMI signal.
B, with 1 DVD with HDMI output function, play video disc, additional 11 is dragged 4 HDMI signal distributor, distributes output 4 tunnel signal sources to test.
Above-mentioned two kinds of testing schemes adopt DVD to play video disc as signal source, be not easy to carry, install and change signal source, need increase to read the circuit such as dish driving, power supply and come read signal source, be unfavorable for saving the space of testing equipment, and as adopted 2 to 4 DVD to play video disc in scheme a simultaneously, could export 4 road HDMI signals, production and maintenance cost are higher.
Utility model content
Main purpose of the present utility model is to propose a kind of multichannel HDMI signal source output circuit and HDMI source device, is intended to reduce HDMI source device quantity, reduces and produces and maintenance cost.
In order to achieve the above object, the utility model proposes a kind of multichannel HDMI signal source output circuit, this multichannel HDMI signal source output circuit respectively with memory and HDMI equipment connection, comprise for the USB interface for described memory access, for read and the content of the described memory of decoding after export the audio video processor of HDMI signal, for being distributed, described HDMI signal is transformed at least HDMI distributor of two-way HDMI signal output, for detection of described HDMI equipment and according to the microcontroller of testing result output control signal, for select the channel multiplexing module of the output channel of described HDMI signal according to described control signal, and for connecting the HDMI interface module of described HDMI equipment, described HDMI interface module comprises at least two HDMI interfaces,
The input of described audio video processor is connected with described USB interface, and the output of described audio video processor is connected with the input of described HDMI distributor; The test side of described HDMI distributor is connected with described key authentication module, and the output of described HDMI distributor is connected with described HDMI interface module; The multiplexing control end of described microcontroller is connected with the input of described channel multiplexing module, and the output of described channel multiplexing module is connected with described HDMI interface module.
Preferably, described audio video processor comprises audio/video decoding chip, the first data input pin of described audio/video decoding chip is connected with the data wire of described USB interface is anodal, and the second data input pin of described audio/video decoding chip is connected with the data wire negative pole of described USB interface.
Preferably, described multichannel HDMI signal source output circuit also comprises input electrostatic protection module, and described input electrostatic protection module comprises the first bidirectional diode and the second bidirectional diode;
One end of described the first bidirectional diode is connected with the data wire of described USB interface is anodal, other end ground connection; One end of described the second bidirectional diode is connected with the data wire negative pole of described USB interface, other end ground connection.
Preferably, described multichannel HDMI signal source output circuit also comprises for the received IR(Infra Red of demodulation, infrared ray) the IR signal processing module of signal, described IR signal processing module comprises the first power input, IR process chip, the first resistance, the first electric capacity and the second electric capacity; The IR signal output pin of described IR process chip is connected with the IR signal input pin of described audio/video decoding chip; One end of described the first resistance is connected with described the first power input, and the other end of described the first resistance is connected with the supply pin of described IR process chip, and via described the first capacity earth, described the second electric capacity and described the first Capacitance parallel connection.
Preferably, described multichannel HDMI signal source output circuit also comprises for verifying the key authentication module of the legal validity of described HDMI equipment, described key authentication module comprises HDCP(High-bandwidth Digital Content Protection, HDCP technology) chip, the second resistance and the 3rd resistance;
The supply pin of described HDCP chip is all connected with described the first power input with read-write pin, the clock pin of described HDCP chip is connected with the HDCP clock end of described HDMI distributor, and be connected with described the first power input via described the second resistance, the data pin of described HDCP chip is connected with the HDCP data terminal of described HDMI distributor, and is connected with described the first power input via described the 3rd resistance; The first address configuration pin of described HDCP chip, the second address configuration pin, the 3rd address configuration pin and the equal ground connection of grounding leg.
Preferably, described channel multiplexing module comprises second source input, multiplex switch chip, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance and the 14 resistance;
Described multiplex switch chip comprises the first selection pin, the second selection pin, enables pin, the first public pin, the second public pin, the first independent foot, the second independent foot, the 3rd independent foot, the 4th independent foot, the 5th independent foot, the 6th independent foot, the 7th independent foot and the 8th independent foot;
Described first selects pin to be connected with an IO mouth of described microcontroller, and is connected with described second source input via described the 4th resistance; Described second selects pin to be connected with the 2nd IO mouth of described microcontroller, and is connected with described second source input via described the 5th resistance; The described pin that enables is connected with the 3rd IO mouth of described microcontroller, and is connected with described second source input via described the 6th resistance; Described the first public pin is connected with the 4th IO mouth of described microcontroller, and described the second public pin is connected with the 5th IO mouth of described microcontroller;
Described the first independent foot, the second independent foot, the 3rd independent foot, the 4th independent foot, the 5th independent foot, the 6th independent foot, the 7th independent foot and the 8th independent foot are connected with described second source input with the 14 resistance via described the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance respectively, and are all connected to described HDMI interface module.
Preferably, described HDMI interface module comprises a HDMI interface, the 2nd HDMI interface, the 3rd HDMI interface and the 4th HDMI interface;
The clock signal pin of a described HDMI interface is connected with described the first independent foot, and the data-signal pin of a described HDMI interface is connected with described the 5th independent foot; The clock signal pin of described the 2nd HDMI interface is connected with described the second independent foot, and the data-signal pin of described the 2nd HDMI interface is connected with described the 6th independent foot; The clock signal pin of described the 3rd HDMI interface is connected with described the 3rd independent foot, and the data-signal pin of described the 3rd HDMI interface is connected with described the 7th independent foot; The clock signal pin of described the 4th HDMI interface is connected with described the 4th independent foot, and the data-signal pin of described the 4th HDMI interface is connected with described the 8th independent foot.
Preferably, described multichannel HDMI signal source output circuit also comprises switch control module, and described switch control module comprises the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor;
The grid of described the first metal-oxide-semiconductor is connected with the 6th IO mouth of described microcontroller, and the source electrode of described the first metal-oxide-semiconductor is connected with described second source input, and the drain electrode of described the first metal-oxide-semiconductor is connected with the signal source power supply pin of a described HDMI interface;
The grid of described the second metal-oxide-semiconductor is connected with the 7th IO mouth of described microcontroller, and the source electrode of described the second metal-oxide-semiconductor is connected with described second source input, and the drain electrode of described the second metal-oxide-semiconductor is connected with the signal source power supply pin of described the 2nd HDMI interface;
The grid of described the 3rd metal-oxide-semiconductor is connected with the 8th IO mouth of described microcontroller, and the source electrode of described the 3rd metal-oxide-semiconductor is connected with described second source input, and the drain electrode of described the 3rd metal-oxide-semiconductor is connected with the signal source power supply pin of described the 3rd HDMI interface;
The grid of described the 4th metal-oxide-semiconductor is connected with the 9th IO mouth of described microcontroller, and the source electrode of described the 4th metal-oxide-semiconductor is connected with described second source input, and the drain electrode of described the 4th metal-oxide-semiconductor is connected with the signal source power supply pin of described the 4th HDMI interface.
Preferably, described multichannel HDMI signal source output circuit also comprises output electrostatic protection module, and described output electrostatic protection module comprises the first protector, the second protector, the 3rd protector, the 4th protector;
The input pin of described the first protector is connected with described switch control module with described multiplex switch chip respectively, and the output pin of described the first protector is connected with a described HDMI interface, and the input pin of described the first protector is connected with output pin;
The input pin of described the second protector is connected with described switch control module with described multiplex switch chip respectively, and the output pin of described the second protector is connected with described the 2nd HDMI interface, and the input pin of described the second protector is connected with output pin;
The input pin of described the 3rd protector is connected with described switch control module with described multiplex switch chip respectively, and the output pin of described the 3rd protector is connected with described the 3rd HDMI interface, and the input pin of described the 3rd protector is connected with output pin;
The input pin of described the 4th protector is connected with described switch control module with described multiplex switch chip respectively, and the output pin of described the 4th protector is connected with described the 4th HDMI interface, and the input pin of described the 4th protector is connected with output pin.
The utility model also proposes a kind of HDMI source device, this HDMI source device comprises memory, also comprise multichannel HDMI signal source output circuit, this multichannel HDMI signal source output circuit respectively with memory and HDMI equipment connection, comprise for the USB interface for described memory access, for read and the content of the described memory of decoding after export the audio video processor of HDMI signal, for being distributed, described HDMI signal is transformed at least HDMI distributor of two-way HDMI signal output, for detection of described HDMI equipment and according to the microcontroller of testing result output control signal, for select the channel multiplexing module of the output channel of described HDMI signal according to described control signal, and for connecting the HDMI interface module of described HDMI equipment, described HDMI interface module comprises at least two HDMI interfaces,
The input of described audio video processor is connected with described USB interface, and the output of described audio video processor is connected with the input of described HDMI distributor; The output of described HDMI distributor is connected with described HDMI interface module; The multiplexing control end of described microcontroller is connected with the input of described channel multiplexing module, and the output of described channel multiplexing module is connected with described HDMI interface module.
The multichannel HDMI signal source output circuit the utility model proposes, by audio video processor read and decoding storage in content, output HDMI signal is to HDMI distributor, HDMI distributor distributes this HDMI signal to be transformed at least two-way HDMI signal output, when microcontroller detects HDMI interface module and is connected with HDMI equipment, HDMI distributor is the HDMI interface with HDMI equipment connection by the selection of microprocessor controls channel multiplexing module, export HDMI signal to HDMI equipment, thereby by the communication with HDMI equipment, whether the function of testing HDMI interface module is normal.Multichannel HDMI signal source output circuit of the present utility model, by audio video processor directly read and decoding storage in content, output HDMI signal is as signal source, and HDMI distributor Jiang Yi road HDMI signal distributes output multi-channel HDMI signal.With respect to prior art, do not need DVD broadcasting video disc or many DVD to play video disc simultaneously and obtain signal source, thereby reduced the quantity of HDMI source device, simplified the mechanism that obtains of signal source, and then reduce and produce and maintenance cost, be easy to carry simultaneously and HDMI source device is installed.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the utility model multichannel HDMI signal source output circuit preferred embodiment;
Fig. 2 is the theory diagram of the utility model multichannel HDMI signal source output circuit specific embodiment;
Fig. 3 is the electrical block diagram of the utility model multichannel HDMI signal source output circuit specific embodiment.
The realization of the purpose of this utility model, functional characteristics and advantage, in connection with embodiment, and is described further with reference to accompanying drawing.
Embodiment
Below in conjunction with Figure of description and specific embodiment, further illustrate the technical solution of the utility model.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
The utility model proposes a kind of multichannel HDMI signal source output circuit.
With reference to Fig. 1, Fig. 1 is the theory diagram of the utility model multichannel HDMI signal source output circuit preferred embodiment.
In the utility model preferred embodiment, multichannel HDMI signal source output circuit is connected with HDMI equipment (not shown) with memory (not shown) respectively, and multichannel HDMI signal source output circuit comprises usb 11, audio video processor 12, HDMI distributor 13, microcontroller 14, channel multiplexing module 15 and HDMI interface module 16; Usb 11 is for accessing for memory, audio video processor 12 for read and the content of decoding storage after export HDMI signal, HDMI distributor 13 is transformed at least two-way HDMI signal output for HDMI signal is distributed, microcontroller 14 is for detection of HDMI equipment and according to testing result output control signal, channel multiplexing module 15 is for selecting the output channel of HDMI signal according to control signal, HDMI interface module 16 is for connecting HDMI equipment, and HDMI interface module 16 comprises at least two HDMI interfaces.
Wherein the input of audio video processor 12 is connected with usb 11, and the output of audio video processor 12 is connected with the input of HDMI distributor 13; The output of HDMI distributor 13 is connected with HDMI interface module 16; The multiplexing control end of microcontroller 14 is connected with the input of channel multiplexing module 15, and the output of channel multiplexing module 15 is connected with HDMI interface module 16.In the present embodiment, this memory is that USB flash disk or the mobile phone of being furnished with usb data line, portable hard drive, MP3, MP4, MP5, panel computer etc. can storing audios or the equipment of video file.HDMI equipment be there is the television set of HDMI interface or computer etc. can audio plays or the equipment of video file.
In the present embodiment, when memory accesses by usb 11, audio video processor 12 read and decoding storage in need the content play, output HDMI signal is to HDMI distributor 13, HDMI distributor 13 distributes this HDMI signal to be transformed at least two-way HDMI signal output, when microcontroller 14 detects HDMI interface module 16 and is connected with HDMI equipment, HDMI distributor 13 is the HDMI interface with HDMI equipment connection by microcontroller 14 control channel Multiplexing modules 15 selections, export HDMI signal to HDMI equipment, thereby by the communication with HDMI equipment, whether the function of testing HDMI interface module 16 is normal.
Multichannel HDMI signal source output circuit of the present utility model, by audio video processor 12 directly read and decoding storage in content, output HDMI signal is as signal source, and HDMI distributor 13Jiang mono-road HDMI signal distributes output multi-channel HDMI signal.With respect to prior art, do not need DVD broadcasting video disc or many DVD to play video disc simultaneously and obtain signal source, thereby reduced the quantity of HDMI source device, simplified the mechanism that obtains of signal source, and then reduce and produce and maintenance cost, be easy to carry simultaneously and HDMI source device is installed.
With reference to Fig. 2, Fig. 2 is the theory diagram of the utility model multichannel HDMI signal source output circuit specific embodiment.
Based on above-described embodiment, multichannel HDMI signal source output circuit also comprises input electrostatic protection module 17, IR signal processing module 18, key authentication module 19, switch control module 20 and output electrostatic protection module 21.Entering electrostatic protection module 17 is connected between usb 11 and audio video processor 12; IR signal processing module 18 is connected with audio video processor 12; key authentication module 19 is connected with HDMI distributor 13; switch control module 20 is connected between microcontroller 14 and output electrostatic protection module 21, and output electrostatic protection module 21 is also connected with HDMI interface module 16 with HDMI distributor 13 channel multiplexing modules 15 respectively.
In the moment that memory is accessed by usb 11, can produce electrostatic interference and surge current, by input electrostatic protection module 17, absorb electrostatic interference and the surge current that moment produces, avoid audio video processor 12 and memory damaged.
When user carries out associative operation in use procedure, by remote controller, send IR signal, IR signal processing module 18 receives this IR signal, and the received IR signal of demodulation, IR signal after demodulation exports audio video processor 12 to, and on-screen menu regulative mode (OSD) menu that audio video processor 12 is default according to it, carries out video data processing according to HDMI form by the IR signal after demodulation, make the picture of HDMI device plays more clear, promote broadcasting pictures quality.
When microcontroller 14 detects HDMI interface module 16 and is connected with HDMI equipment, HDMI distributor 13 reads key information from key authentication module 19, by the legal validity of mutual authentication secret between read key information and the key of HDMI equipment, if it is qualified to verify, as signal source, normally export HDMI signal to HDMI equipment, thereby by the communication with HDMI equipment, whether the function of testing HDMI interface module 16 is normal; If verify defectively, cut off the output of HDMI signal.
When microcontroller 14 detects and has HDMI interface not connect HDMI equipment in HDMI interface module 16, microcontroller 14 outputs control signals to switch control module 20, switch control module 20 cuts off this HDMI interface output supply power voltage to HDMI equipment according to the control signal of microcontroller 14, make the HDMI interface that does not connect HDMI equipment not export supply power voltage, reduce the wasting of resources.
In the moment that HDMI equipment is accessed by HDMI interface; also can produce electrostatic interference and surge current; by output electrostatic protection module 21, absorb electrostatic interference and the surge current that moment produces, avoid HDMI distributor 13, channel multiplexing module 15 and HDMI equipment damaged.
In conjunction with Fig. 1 to Fig. 3, wherein Fig. 3 is the electrical block diagram of the utility model multichannel HDMI signal source output circuit specific embodiment.
As shown in Figure 3, audio video processor 12 comprises audio/video decoding chip U1, the first data input pin USB_DP of audio/video decoding chip U1 is connected with the anodal D+ of the data wire of usb 11, and the second data input pin USB_DM of audio/video decoding chip U1 is connected with the data wire negative pole D-of usb 11.Audio/video decoding chip U1 is according to the data-signal of the anodal D+ of the data wire from usb 11 and data wire negative pole D-output, content in read memory, as audio frequency, video file, and read content is carried out to Digital Signal Processing, read content decoding is become to audio-video code stream, according to HDMI formatted output HDMI signal V_HDMI as signal source.
Input electrostatic protection module 17 comprises the first bidirectional diode D1 and the second bidirectional diode D2.One end of the first bidirectional diode D1 is connected with the anodal D+ of data wire of usb 11, the other end ground connection of the first bidirectional diode D1; One end of the second bidirectional diode D2 is connected with the data wire negative pole D-of usb 11, the other end ground connection of the second bidirectional diode D2.
The first bidirectional diode D1 and the second bidirectional diode D2 are electrostatic protection device, for static, discharge.In the moment that memory is accessed by usb 11, can produce electrostatic interference and surge current, logical the first bidirectional diode D1 and the second bidirectional diode D2 absorb electrostatic interference and the surge current that moment produces, and avoid audio video processor 12 and memory damaged.
IR signal processing module 18 comprises that the first power input VIN1, IR process chip U2, the first resistance R 1, the first capacitor C 1 and the second capacitor C 2, the first resistance R 1, the first capacitor C 1 and the second capacitor C 2 form the current supply circuit of IR process chip U2.The IR signal output pin IRO of IR process chip U2 is connected with the IR signal input pin IR_IN of audio/video decoding chip U1; One end of the first resistance R 1 is connected with the first power input VIN1, and the other end of the first resistance R 1 is connected with the supply pin VCC1 of IR process chip U2, and via the first capacitor C 1 ground connection, the second capacitor C 2 is in parallel with the first capacitor C 1.
When user carries out associative operation in use procedure, by remote controller, send IR signal, IR process chip U2 receives this IR signal, IR process chip U2 carries out demodulation by the IR signal receiving and is converted to the signal of telecommunication, be that IR signal after demodulation is the signal of telecommunication, the IR signal after demodulation is input in audio/video decoding chip U1, the various states in control signal source, as loop play, HDMI output resolution ratio etc., HDMI equipment is correspondingly play according to the state of signal source.And audio/video decoding chip U1 is according to the setting in OSD menu, according to HDMI form, the IR signal after demodulation is carried out to video data processing, makes the picture of HDMI device plays more clear, promote broadcasting pictures quality.
HDCP chip U3 reads key information by clock pin SCL and the data pin SDA of HDCP chip U3, and with I2C form, this key information is exported to HDCP clock end HDCP_SCL and the HDCP data terminal HDCP_SDA of HDMI distributor 13, the key that HDMI distributor 13 is got key information and HDMI equipment by this is compared, the legal validity of mutual authentication secret between the key of the key information soon reading and HDMI equipment, if it is qualified to verify, the function that HDMI interface in HDMI interface module 16 is described is normal, HDMI signal V_HDMI normally exports HDMI equipment to as signal source, HDMI equipment normal play, if verify defectively, illustrate that the function of the HDMI interface in HDMI interface module 16 is undesired, close audio frequency and video picture signal, cut off the output of HDMI signal V_HDMI.Thereby by the communication between HDMI source device and HDMI equipment, whether the function that can test the HDMI interface in HDMI interface module 16 is normal.
First selects pin A to be connected with an IO mouth IO1 of microcontroller 14, and is connected with second source input VIN2 via the 4th resistance R 4; Second selects pin B to be connected with the 2nd IO mouth IO2 of microcontroller 14, and is connected with second source input VIN2 via the 5th resistance R 5; Enable pin
be connected with the 3rd IO mouth IO3 of microcontroller 14, and be connected with second source input VIN2 via the 6th resistance R 6; The first public pin X is connected with the 4th IO mouth IO4 of microcontroller 14, and the second public pin Y is connected with the 5th IO mouth IO5 of microcontroller 14.
The first independent foot X0, the second independent foot X1, the 3rd independent foot X2, the 4th independent foot X3, the 5th independent foot Y0, the 6th independent foot Y1, the 7th independent foot Y2 and the 8th independent foot Y3 are connected with second source input VIN2 with the 14 resistance R 14, and are all connected to HDMI interface module 16 via the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R the 10, the 11 resistance R the 11, the 12 resistance R the 12, the 13 resistance R 13 respectively.
The clock signal pin SCL1 of the one HDMI interface H1 is connected with the first independent foot X0, and the data-signal pin SDA1 of a HDMI interface H1 is connected with the 5th independent foot Y0; The clock signal pin SCL2 of the 2nd HDMI interface H2 is connected with the second independent foot X1, and the data-signal pin SDA2 of the 2nd HDMI interface H2 is connected with the 6th independent foot Y1; The clock signal pin SCL3 of the 3rd HDMI interface H3 is connected with the 3rd independent foot X2, and the data-signal pin SDA3 of the 3rd HDMI interface H3 is connected with the 7th independent foot Y2; The clock signal pin SCL4 of the 4th HDMI interface H4 is connected with the 4th independent foot X3, and the data-signal pin SDA4 of the 4th HDMI interface H4 is connected with the 8th independent foot Y3.
Microcontroller 14 outputs control signals to first of multiplex switch chip U4 and selects pin A, second select pin B and enable pin
, control the multiplexer switch of multiplex switch chip U4 inside, in the present embodiment, multiplexer switch chip U4 enables pin
for Low level effective, when exporting to, microcontroller 14 enables pin
control signal be low level, enable pin
be low level, multiplexer switch chip U4 normally works.Under multiplexer switch chip U4 normal operation, when the first selection pin A and second selects pin B to be low level, the first public pin X is communicated with the first independent foot X0, and the second public pin is communicated with the 5th independent foot Y0, selects a HDMI interface H1 output HDMI signal V_HDMI; When the first selection pin A is low level, second and selects pin B to be high level, the first public pin X is communicated with the second independent foot X1, and the second public pin is communicated with the 6th independent foot Y1, and selection the 2nd HDMI interface H2 exports HDMI signal V_HDMI; When the first selection pin A is high level, second and selects pin B to be low level, the first public pin X is communicated with the 3rd independent foot X2, and the second public pin Y is communicated with the 7th independent foot Y2, and selection the 3rd HDMI interface H3 exports HDMI signal V_HDMI; When the first selection pin A and second selects pin B to be high level, the first public pin X is communicated with the 4th independent foot X3, and the second public pin Y is communicated with the 8th independent foot Y3, selects the 4th HDMI interface H4 output HDMI signal V_HDMI.
The grid of the first metal-oxide-semiconductor M1 is connected with the 6th IO mouth IO6 of microcontroller 14, and the source electrode of the first metal-oxide-semiconductor M1 is connected with second source input VIN2, and the drain electrode of the first metal-oxide-semiconductor M1 is connected with the signal source power supply pin HVCC1 of a HDMI interface H1; The grid of the second metal-oxide-semiconductor M2 is connected with the 7th IO mouth IO7 of microcontroller 14, and the source electrode of the second metal-oxide-semiconductor M2 is connected with second source input VIN2, and the drain electrode of the second metal-oxide-semiconductor M2 is connected with the signal source power supply pin HVCC2 of the 2nd HDMI interface H2; The grid of the 3rd metal-oxide-semiconductor M3 is connected with the 8th IO mouth IO8 of microcontroller 14, and the source electrode of the 3rd metal-oxide-semiconductor M3 is connected with second source input VIN2, and the drain electrode of the 3rd metal-oxide-semiconductor M3 is connected with the signal source power supply pin HVCC3 of the 3rd HDMI interface H3; The grid of the 4th metal-oxide-semiconductor M4 is connected with the 9th IO mouth IO9 of microcontroller 14, and the source electrode of the 4th metal-oxide-semiconductor M4 is connected with second source input VIN2, and the drain electrode of the 4th metal-oxide-semiconductor M4 is connected HVCC4 with the signal source power supply pin of the 4th HDMI interface H4.
Whether the HDMI interface that microcontroller 14 detects in HDMI interface module 16 is connected with HDMI equipment, when microcontroller 14 detects while having HDMI interface not connect HDMI equipment in HDMI interface module 16, microcontroller 14 outputs control signals to switch control module 20, and switch control module 20 cuts off this HDMI interface output supply power voltage to HDMI equipment according to the control signal of microcontroller 14; When microcontroller 14 detects while having HDMI interface connect HDMI equipment in HDMI interface module 16, switch control module 20 is controlled supply power voltages and is exported HDMI equipment to, and HDMI equipment Inspection is to HDMI signal V_HDMI, HDMI equipment and the communication of HDMI source device.For example, when microcontroller 14 detects a HDMI interface H1 and does not connect HDMI equipment, microcontroller 14 is by the grid that controls signal to the first metal-oxide-semiconductor M1 of its 6th IO mouth IO6 output high level, the first metal-oxide-semiconductor M1 cut-off, from the supply power voltage of second source input VIN2 input, can not export by the signal source power supply pin HVCC1 of a HDMI interface H1, make a HDMI interface H1 who does not connect HDMI equipment not export supply power voltage, reduce the wasting of resources; When microcontroller 14 detects a HDMI interface H1 and is connected with HDMI equipment, microcontroller 14 is by the grid that controls signal to the first metal-oxide-semiconductor M1 of its 6th IO mouth IO6 output low level, the first metal-oxide-semiconductor M1 conducting, the supply power voltage of inputting from second source input VIN2 is exported by the signal source power supply pin HVCC1 of a HDMI interface H1, HDMI equipment Inspection is to HDMI signal V_HDMI, HDMI equipment and the communication of HDMI source device.
Output electrostatic protection module 21 comprises the first protector ESD1, the second protector ESD2, the 3rd protector ESD3, the 4th protector ESD4.
The input pin of the first protector ESD1 is connected with switch control module 20 with multiplex switch chip U4 respectively, and the output pin of the first protector ESD1 is connected with a HDMI interface H1, and the input pin of the first protector ESD1 is connected with output pin; The input pin of the second protector ESD2 is connected with switch control module 20 with multiplex switch chip U4 respectively, and the output pin of the second protector ESD2 is connected with the 2nd HDMI interface H2, and the input pin of the second protector ESD2 is connected with output pin; The input pin of the 3rd protector ESD3 is connected with switch control module 20 with multiplex switch chip U4 respectively, and the output pin of the 3rd protector ESD3 is connected with the 3rd HDMI interface H3, and the input pin of the 3rd protector ESD3 is connected with output pin; The input pin of the 4th protector ESD4 is connected with switch control module 20 with multiplex switch chip U4 respectively, and the output pin of the 4th protector ESD4 is connected with the 4th HDMI interface H4, and the input pin of the 4th protector ESD4 is connected with output pin.
Particularly, as shown in Figure 3, the first input pin I11 of the first protector ESD1 is connected with the first independent foot X0, and is connected with the first output pin O11 of the first protector ESD1, and the first output pin O11 of the first protector ESD1 is connected with the clock signal pin HSCL1 of a HDMI interface H1; The second input pin I12 of the first protector ESD1 is connected with the 5th independent foot Y0, and is connected with the second output pin O12 of the first protector ESD1, and the second output pin O12 of the first protector ESD1 is connected with the data-signal pin HSDA1 of a HDMI interface H1; The 3rd input pin I13 of the first protector ESD1 is connected with the drain electrode of the first metal-oxide-semiconductor M1; and be connected with the 3rd output pin O13 of the first protector ESD1, the 3rd output pin O13 of the first protector ESD1 is connected with the signal source power supply pin HVCC1 of a HDMI interface H1.
The first input pin I21 of the second protector ESD2 is connected with the second independent foot X1, and is connected with the first output pin O21 of the second protector ESD2, and the first output pin O21 of the second protector ESD2 is connected with the clock signal pin HSCL2 of the 2nd HDMI interface H2; The second input pin I22 of the second protector ESD2 is connected with the 6th independent foot Y1, and is connected with the second output pin O22 of the second protector ESD2, and the second output pin O22 of the second protector ESD2 is connected with the data-signal pin HSDA2 of the 2nd HDMI interface H2; The 3rd input pin I23 of the second protector ESD2 is connected with the drain electrode of the second metal-oxide-semiconductor M2; and be connected with the 3rd output pin O23 of the second protector ESD2, the 3rd output pin O23 of the second protector ESD2 is connected with the signal source power supply pin HVCC2 of the 2nd HDMI interface H2.
The first input pin I31 of the 3rd protector ESD3 is connected with the 3rd independent foot X2, and is connected with the first output pin O31 of the 3rd protector ESD3, and the first output pin O31 of the 3rd protector ESD3 is connected with the clock signal pin HSCL3 of the 3rd HDMI interface H3; The second input pin I32 of the 3rd protector ESD3 is connected with the 7th independent foot Y2, and is connected with the second output pin O32 of the 3rd protector ESD3, and the second output pin O32 of the 3rd protector ESD3 is connected with the data-signal pin HSDA3 of the 3rd HDMI interface H3; The 3rd input pin I33 of the 3rd protector ESD3 is connected with the drain electrode of the 3rd metal-oxide-semiconductor M3; and be connected with the 3rd output pin O33 of the 3rd protector ESD3, the 3rd output pin O33 of the 3rd protector ESD3 is connected with the signal source power supply pin HVCC3 of the 3rd HDMI interface H3.
The first input pin I41 of the 4th protector ESD4 is connected with the 4th independent foot X3, and is connected with the first output pin O41 of the 4th protector ESD4, and the first output pin O41 of the 4th protector ESD4 is connected with the clock signal pin HSCL4 of the 4th HDMI interface H4; The second input pin I42 of the 4th protector ESD4 is connected with the 8th independent foot Y3, and is connected with the second output pin O42 of the 4th protector ESD4, and the second output pin O42 of the 4th protector ESD4 is connected with the data-signal pin HSDA4 of the 4th HDMI interface H4; The 3rd input pin I43 of the 4th protector ESD4 is connected with the drain electrode of the 4th metal-oxide-semiconductor M4, and is connected with the 3rd output pin O43 of the 4th protector ESD4, and the 3rd output pin of the 4th protector ESD4 is connected with the signal source power supply pin HVCC4 of the 4th HDMI interface H4.
In the present embodiment, the first protector ESD1, the second protector ESD2, the 3rd protector ESD3 and the 4th protector ESD4 are electrostatic protection device, HDMI equipment is being passed through to a HDMI interface H1, the 2nd HDMI interface H2, the moment of the 3rd HDMI interface H3 and the 4th HDMI interface H4 access, can produce electrostatic interference and surge current, by the first protector ESD1, the second protector ESD2, the 3rd protector ESD3 and the 4th protector ESD4 absorb electrostatic interference and the surge current that moment produces, avoid damaged with channel multiplexing module 15 and the HDMI equipment of HDMI equipment connection.
Equally; for absorbing electrostatic interference and the surge current in HDMI distributor 13; also between HDMI distributor 13 and HDMI interface module 16, protector is set; avoid damaged with HDMI distributor 13 and the HDMI equipment of HDMI equipment connection; the structure of this protector, with reference to above-mentioned the first protector ESD1, the second protector ESD2, the 3rd protector ESD3 and the 4th protector ESD4, describes herein no longer one by one.
The utility model also proposes a kind of HDMI source device, this HDMI source device comprises memory and multichannel HDMI signal source output circuit, structure, the operation principle of this multichannel HDMI signal source output circuit and the beneficial effect bringing all can, with reference to above-described embodiment, repeat no more herein.
The foregoing is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (10)
1. a multichannel HDMI signal source output circuit, respectively with memory and HDMI equipment connection, it is characterized in that, comprise for the USB interface for described memory access, for read and the content of the described memory of decoding after export the audio video processor of HDMI signal, for being distributed, described HDMI signal is transformed at least HDMI distributor of two-way HDMI signal output, for detection of described HDMI equipment and according to the microcontroller of testing result output control signal, for select the channel multiplexing module of the output channel of described HDMI signal according to described control signal, and for connecting the HDMI interface module of described HDMI equipment, described HDMI interface module comprises at least two HDMI interfaces,
The input of described audio video processor is connected with described USB interface, and the output of described audio video processor is connected with the input of described HDMI distributor; The output of described HDMI distributor is connected with described HDMI interface module; The multiplexing control end of described microcontroller is connected with the input of described channel multiplexing module, and the output of described channel multiplexing module is connected with described HDMI interface module.
2. multichannel HDMI signal source output circuit as claimed in claim 1, it is characterized in that, described audio video processor comprises audio/video decoding chip, the first data input pin of described audio/video decoding chip is connected with the data wire of described USB interface is anodal, and the second data input pin of described audio/video decoding chip is connected with the data wire negative pole of described USB interface.
3. multichannel HDMI signal source output circuit as claimed in claim 2, is characterized in that, described multichannel HDMI signal source output circuit also comprises input electrostatic protection module, and described input electrostatic protection module comprises the first bidirectional diode and the second bidirectional diode;
One end of described the first bidirectional diode is connected with the data wire of described USB interface is anodal, other end ground connection; One end of described the second bidirectional diode is connected with the data wire negative pole of described USB interface, other end ground connection.
4. the multichannel HDMI signal source output circuit as described in any one in claims 1 to 3, it is characterized in that, described multichannel HDMI signal source output circuit also comprises the IR signal processing module for the received IR signal of demodulation, and described IR signal processing module comprises the first power input, IR process chip, the first resistance, the first electric capacity and the second electric capacity; The IR signal output pin of described IR process chip is connected with the IR signal input pin of described audio/video decoding chip; One end of described the first resistance is connected with described the first power input, and the other end of described the first resistance is connected with the supply pin of described IR process chip, and via described the first capacity earth, described the second electric capacity and described the first Capacitance parallel connection.
5. multichannel HDMI signal source output circuit as claimed in claim 4, it is characterized in that, described multichannel HDMI signal source output circuit also comprises that described key authentication module comprises HDCP chip, the second resistance and the 3rd resistance for verifying the key authentication module of the legal validity of described HDMI equipment;
The supply pin of described HDCP chip is all connected with described the first power input with read-write pin, the clock pin of described HDCP chip is connected with the HDCP clock end of described HDMI distributor, and be connected with described the first power input via described the second resistance, the data pin of described HDCP chip is connected with the HDCP data terminal of described HDMI distributor, and is connected with described the first power input via described the 3rd resistance; The first address configuration pin of described HDCP chip, the second address configuration pin, the 3rd address configuration pin and the equal ground connection of grounding leg.
6. multichannel HDMI signal source output circuit as claimed in claim 5, it is characterized in that, described channel multiplexing module comprises second source input, multiplex switch chip, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance and the 14 resistance;
Described multiplex switch chip comprises the first selection pin, the second selection pin, enables pin, the first public pin, the second public pin, the first independent foot, the second independent foot, the 3rd independent foot, the 4th independent foot, the 5th independent foot, the 6th independent foot, the 7th independent foot and the 8th independent foot;
Described first selects pin to be connected with an IO mouth of described microcontroller, and is connected with described second source input via described the 4th resistance; Described second selects pin to be connected with the 2nd IO mouth of described microcontroller, and is connected with described second source input via described the 5th resistance; The described pin that enables is connected with the 3rd IO mouth of described microcontroller, and is connected with described second source input via described the 6th resistance; Described the first public pin is connected with the 4th IO mouth of described microcontroller, and described the second public pin is connected with the 5th IO mouth of described microcontroller;
Described the first independent foot, the second independent foot, the 3rd independent foot, the 4th independent foot, the 5th independent foot, the 6th independent foot, the 7th independent foot and the 8th independent foot are connected with described second source input with the 14 resistance via described the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance respectively, and are all connected to described HDMI interface module.
7. multichannel HDMI signal source output circuit as claimed in claim 6, is characterized in that, described HDMI interface module comprises a HDMI interface, the 2nd HDMI interface, the 3rd HDMI interface and the 4th HDMI interface;
The clock signal pin of a described HDMI interface is connected with described the first independent foot, and the data-signal pin of a described HDMI interface is connected with described the 5th independent foot; The clock signal pin of described the 2nd HDMI interface is connected with described the second independent foot, and the data-signal pin of described the 2nd HDMI interface is connected with described the 6th independent foot; The clock signal pin of described the 3rd HDMI interface is connected with described the 3rd independent foot, and the data-signal pin of described the 3rd HDMI interface is connected with described the 7th independent foot; The clock signal pin of described the 4th HDMI interface is connected with described the 4th independent foot, and the data-signal pin of described the 4th HDMI interface is connected with described the 8th independent foot.
8. multichannel HDMI signal source output circuit as claimed in claim 7, it is characterized in that, described multichannel HDMI signal source output circuit also comprises switch control module, and described switch control module comprises the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor;
The grid of described the first metal-oxide-semiconductor is connected with the 6th IO mouth of described microcontroller, and the source electrode of described the first metal-oxide-semiconductor is connected with described second source input, and the drain electrode of described the first metal-oxide-semiconductor is connected with the signal source power supply pin of a described HDMI interface;
The grid of described the second metal-oxide-semiconductor is connected with the 7th IO mouth of described microcontroller, and the source electrode of described the second metal-oxide-semiconductor is connected with described second source input, and the drain electrode of described the second metal-oxide-semiconductor is connected with the signal source power supply pin of described the 2nd HDMI interface;
The grid of described the 3rd metal-oxide-semiconductor is connected with the 8th IO mouth of described microcontroller, and the source electrode of described the 3rd metal-oxide-semiconductor is connected with described second source input, and the drain electrode of described the 3rd metal-oxide-semiconductor is connected with the signal source power supply pin of described the 3rd HDMI interface;
The grid of described the 4th metal-oxide-semiconductor is connected with the 9th IO mouth of described microcontroller, and the source electrode of described the 4th metal-oxide-semiconductor is connected with described second source input, and the drain electrode of described the 4th metal-oxide-semiconductor is connected with the signal source power supply pin of described the 4th HDMI interface.
9. multichannel HDMI signal source output circuit as claimed in claim 8, it is characterized in that, described multichannel HDMI signal source output circuit also comprises output electrostatic protection module, and described output electrostatic protection module comprises the first protector, the second protector, the 3rd protector, the 4th protector;
The input pin of described the first protector is connected with described switch control module with described multiplex switch chip respectively, and the output pin of described the first protector is connected with a described HDMI interface, and the input pin of described the first protector is connected with output pin;
The input pin of described the second protector is connected with described switch control module with described multiplex switch chip respectively, and the output pin of described the second protector is connected with described the 2nd HDMI interface, and the input pin of described the second protector is connected with output pin;
The input pin of described the 3rd protector is connected with described switch control module with described multiplex switch chip respectively, and the output pin of described the 3rd protector is connected with described the 3rd HDMI interface, and the input pin of described the 3rd protector is connected with output pin;
The input pin of described the 4th protector is connected with described switch control module with described multiplex switch chip respectively, and the output pin of described the 4th protector is connected with described the 4th HDMI interface, and the input pin of described the 4th protector is connected with output pin.
10. a HDMI source device, comprises memory, it is characterized in that, also comprises the multichannel HDMI signal source output circuit described in any one in claim 1 to 9.
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|---|---|---|---|
| CN201320523085.2U CN203522947U (en) | 2013-08-23 | 2013-08-23 | Multi-path HDMI (high-definition multimedia interface) signal source output circuit and HDMI signal source device |
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|---|---|---|---|
| CN201320523085.2U CN203522947U (en) | 2013-08-23 | 2013-08-23 | Multi-path HDMI (high-definition multimedia interface) signal source output circuit and HDMI signal source device |
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| CN203522947U true CN203522947U (en) | 2014-04-02 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105704543A (en) * | 2016-01-26 | 2016-06-22 | 武汉精测电子技术股份有限公司 | A portable picture signal source and a control method thereof |
| CN106575210A (en) * | 2014-08-29 | 2017-04-19 | Bsh家用电器有限公司 | Circuit assembly for operating more than two visual output units, household device and method therefor |
| CN107818259A (en) * | 2017-11-29 | 2018-03-20 | 湖南长城医疗科技有限公司 | One kind printing authorization control circuit and control method |
| CN109155871A (en) * | 2016-04-26 | 2019-01-04 | 麦克赛尔株式会社 | Image output system, image output device and connection cables |
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2013
- 2013-08-23 CN CN201320523085.2U patent/CN203522947U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106575210A (en) * | 2014-08-29 | 2017-04-19 | Bsh家用电器有限公司 | Circuit assembly for operating more than two visual output units, household device and method therefor |
| CN105704543A (en) * | 2016-01-26 | 2016-06-22 | 武汉精测电子技术股份有限公司 | A portable picture signal source and a control method thereof |
| CN109155871A (en) * | 2016-04-26 | 2019-01-04 | 麦克赛尔株式会社 | Image output system, image output device and connection cables |
| CN107818259A (en) * | 2017-11-29 | 2018-03-20 | 湖南长城医疗科技有限公司 | One kind printing authorization control circuit and control method |
| CN107818259B (en) * | 2017-11-29 | 2024-02-09 | 湖南长城医疗科技有限公司 | Printing authorization control circuit and control method |
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