CN105491305B - A kind of intelligent multimedia signal shifter - Google Patents
A kind of intelligent multimedia signal shifter Download PDFInfo
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- CN105491305B CN105491305B CN201610041609.2A CN201610041609A CN105491305B CN 105491305 B CN105491305 B CN 105491305B CN 201610041609 A CN201610041609 A CN 201610041609A CN 105491305 B CN105491305 B CN 105491305B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/268—Signal distribution or switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/148—Video amplifiers
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The present invention relates to a kind of intelligent multimedia signal shifters, amplify distributor circuit including signal, audio signal switching circuit, intelligent switching circuit, the signal amplification distributor circuit and audio signal switching circuit are connect with intelligent switching circuit, the intelligence switching circuit includes the notebook video interface for connecting with notebook, desktop computer video interface for being connect with desktop computer, resistance R1 to resistance R9, triode Q1 to triode Q4, diode D1 to diode D4, first LED, 2nd LED, first relay, second relay, third relay and DC power supply.The present invention is small in size, easy for installation, whether can access use to notebook and detect, to automatically switch to multi-media signal, is not necessarily to manual intervention, time saving and energy saving, and each educational institution is suitble to use.
Description
Technical field
The present invention relates to signal shifter more particularly to a kind of intelligent multimedia signal shifters.
Background technique
Multimedia teaching facility is to integrate audio-video device, can demonstrate out various teaching methods, greatly reduces religion
The teaching load of teacher can also improve the quality of teaching, current each school and various training organizations all use multimedia teaching facility into
Row teaching.Most of multimedia teaching facilities are all made of computer, video distributor, projector and sound amplifier.
Each teacher has the individual character of oneself, and some teachers like the computer teaching being had by oneself with multi-media classroom, have
Teacher likes carrying the laptop of oneself to teaching in classroom, therefore often turns the desktop computer signal port in former classroom
Change notebook information port into, conversion process also bothers, and after converting, if signal port not restored, will affect
There is the case where can not find signal shift switch or switching signal error, Yao Xiangxiang in the use of next teacher, most of teacher
It closes class management personnel to seek help, certain class period can be delayed, also increase certain workload for class management personnel.
Although the letter for thering is VGA signal distributor and central control system to can solve desktop computer and laptop on the market at present
Number switching problem, but and it is not humane, need manually to be controlled, especially be operated for common teachers more difficult.
Summary of the invention
In view of the above technical problems, the purpose of the present invention is to provide it is a kind of it is small in size, low in energy consumption, automatically switch, be not necessarily to
The intelligent multimedia signal shifter manually restored.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of intelligent multimedia signal shifter, including signal amplification distributor circuit, audio signal switching circuit, intelligence are cut
Circuit is changed, the signal amplification distributor circuit and audio signal switching circuit are connect with intelligent switching circuit, and the intelligence is cut
Changing circuit includes that the notebook video interface for connecting with notebook, the desktop computer video for connecting with desktop computer connect
Mouth, resistance R1 to resistance R9, triode Q1 to triode Q4, diode D1 to diode D4, the first LED, the 2nd LED, first
Relay, the second relay, third relay and DC power supply, one end connection notebook video interface of the resistance R1
Detect pin, the other end of resistance R1 and one end of resistance R2 connect with the base stage of triode Q1, the other end of resistance R2 with
The emitter of triode Q1 is grounded, and the collector of triode Q1 is connect by resistance R3 with the cathode of the first LED, resistance R4's
The base stage of one end and triode Q2 are connect with the anode of the first LED, the anode of the other end connection DC power supply of resistance R4, should
The cathode of DC power supply is grounded；One end of the collector connection resistance R5 of triode Q2, the other end of resistance R5 is with resistance R4's
Other end connection, the cathode of the emitter connection diode D1 of triode Q2, the base of the positive connecting triode Q3 of diode D1
Pole, the base stage of the emitter connecting triode Q4 of triode Q3, the emitter ground connection of triode Q4, the collector of triode Q4 connect
The cathode of the 2nd LED is connect, the anode of the 2nd LED passes through the other end of resistance R6 connection resistance R5；The input of first relay
Common end passes through the other end of resistance R7 connection resistance R5, and the input common end of the second relay passes through resistance R8 connection resistance R5
The other end, the input common end of third relay passes through the other end of resistance R9 connection resistance R5；The anode of diode D2, two
The anode of pole pipe D3, the anode of diode D4, the output common end of the first relay, the second relay output common end and the
The output common end of three relays is connect with the collector of triode Q3, and the cathode of diode D2 connects the defeated of the first relay
Enter common end, the cathode of diode D3 connects the input common end of the second relay, and the cathode of diode D4 connects third relay
The input common end of device；The normal-closed end of first relay, the normal-closed end of the second relay, third relay normal-closed end with pen
Remember this video interface connect, the normally open end of the first relay, the normally open end of the second relay, third relay normally open end with
The connection of desktop computer video interface, the first relay, the second relay, third relay connect with signal amplification distributor circuit
It connects；The third relay is also connected with audio signal switching circuit.
Preferably, the signal amplification distributor circuit includes signal amplification chip, voltage-stabiliser tube, the first amplifying circuit, second
The input terminal of amplifying circuit, third amplifying circuit, the first video output interface, the second video output interface, the voltage-stabiliser tube connects
The other end of connecting resistance R5, the feeder ear of the output end connection signal amplification chip of voltage-stabiliser tube, the ground terminal ground connection of voltage-stabiliser tube；It is described
The first input end of first output end connection signal amplification chip of the first relay, the second output terminal connection of the first relay
Second input terminal of signal amplification chip, the input terminal of the first output end the first amplifying circuit of connection of the second relay, second
The second output terminal of relay connects the input terminal of the second amplifying circuit, and the output end of third relay connects third amplifying circuit
Input terminal, the first output end of the signal amplification chip connects the first video output interface, the second of signal amplification chip
Output end connects the second video output interface, the output end of the first amplifying circuit, the output end of the second amplifying circuit, third amplification
The output end of circuit is connect with the first video output interface, the second video output interface.
Preferably, the model HD74LS244P of the signal amplification chip.
Preferably, first amplifying circuit includes capacitor C1, capacitor C2, resistance R10 to resistance 18, triode Q5 to three
One end of pole pipe Q8, capacitor C1 connect the first output end of the second relay, one end of resistance R10 and one end, the electricity of resistance R11
The other end for holding C1 is connect with the base stage of triode Q5, the input terminal of the other end connection voltage-stabiliser tube of resistance R10, resistance R11
The other end ground connection；The collector of triode Q5 and one end of resistance R12 are connect with the base stage of triode Q6, resistance R12's
The other end connects the other end of resistance R10, and the emitter of triode Q5 and one end of resistance R13 pass through resistance R14 and be grounded；Electricity
The collector of the other end and triode Q6 that hinder R13 is connect with the base stage of triode Q7, one end connecting triode of resistance R15
The emitter of Q6, the other end of the one end of the other end of resistance R15, the collector of triode Q7 and resistance R16 with resistance R12
Connection；The emitter of triode Q7 and one end of resistance R17 pass through resistance R18 and are grounded；The other end of resistance R17 connects three poles
The base stage of pipe Q8, the other end of resistance R16 and one end of capacitor C2 are connect with the emitter of triode Q8, the collection of triode Q8
Electrode ground connection；First video output interface and the second video output interface are connect with the other end of capacitor C2.
Preferably, second amplifying circuit includes capacitor C1, capacitor C2, resistance R10 to resistance 18, triode Q5 to three
One end of pole pipe Q8, capacitor C1 connect the second output terminal of the second relay, one end of resistance R10 and one end, the electricity of resistance R11
The other end for holding C1 is connect with the base stage of triode Q5, the input terminal of the other end connection voltage-stabiliser tube of resistance R10, resistance R11
The other end ground connection；The collector of triode Q5 and one end of resistance R12 are connect with the base stage of triode Q6, resistance R12's
The other end connects the other end of resistance R10, and the emitter of triode Q5 and one end of resistance R13 pass through resistance R14 and be grounded；Electricity
The collector of the other end and triode Q6 that hinder R13 is connect with the base stage of triode Q7, one end connecting triode of resistance R15
The emitter of Q6, the other end of the one end of the other end of resistance R15, the collector of triode Q7 and resistance R16 with resistance R12
Connection；The emitter of triode Q7 and one end of resistance R17 pass through resistance R18 and are grounded；The other end of resistance R17 connects three poles
The base stage of pipe Q8, the other end of resistance R16 and one end of capacitor C2 are connect with the emitter of triode Q8, the collection of triode Q8
Electrode ground connection；First video output interface and the second video output interface are connect with the other end of capacitor C2.
Preferably, the third amplifying circuit includes capacitor C1, capacitor C2, resistance R10 to resistance 18, triode Q5 to three
The output end of one end connection third relay of pole pipe Q8, capacitor C1, one end of resistance R10 and one end, the capacitor C1 of resistance R11
The other end connect with the base stage of triode Q5, the input terminal of the other end of resistance R10 connection voltage-stabiliser tube, resistance R11's is another
One end ground connection；The collector of triode Q5 and one end of resistance R12 are connect with the base stage of triode Q6, and resistance R12's is another
The other end of end connection resistance R10, the emitter of triode Q5 and one end of resistance R13 pass through resistance R14 and are grounded；Resistance
The other end of R13 and the collector of triode Q6 are connect with the base stage of triode Q7, one end connecting triode Q6 of resistance R15
Emitter, one end of the other end of resistance R15, the collector of triode Q7 and resistance R16 with the other end of resistance R12 connect
It connects；The emitter of triode Q7 and one end of resistance R17 pass through resistance R18 and are grounded；The other end connecting triode of resistance R17
The base stage of Q8, the other end of resistance R16 and one end of capacitor C2 are connect with the emitter of triode Q8, the current collection of triode Q8
Pole ground connection；First video output interface and the second video output interface are connect with the other end of capacitor C2.
Preferably, the audio signal switching circuit includes notebook audio input for connecting with notebook, is used for
The desktop computer audio input that is connect with desktop computer, sound amplifier, sound pick-up outfit, the notebook audio input connection third after
The normal-closed end of electric appliance, desktop computer audio input connect the normally open end of third relay, the sound amplifier and sound pick-up outfit with
The connection of the output end of third relay.
Compared with prior art, the beneficial effects of the present invention are:
The present invention is small in size, easy for installation, whether can access use to notebook and detect, to believe multimedia
Number automatically switched, is not necessarily to manual intervention, it is time saving and energy saving, it is suitble to each educational institution to use.
Detailed description of the invention
Fig. 1 is the circuit structure diagram of intelligent switching circuit of the invention；
Fig. 2 is the circuit structure diagram that signal of the invention amplifies distributor circuit；
Fig. 3 is the circuit structure diagram of frequency switch circuit of the invention.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the present invention:
Referring to Fig. 1, a kind of intelligent multimedia signal shifter provided by the invention comprising signal amplification distributor circuit,
Audio signal switching circuit, intelligent switching circuit, the signal amplification distributor circuit and audio signal switching circuit with intelligence
Switching circuit connection, intelligent switching circuit can automatically detect notebook input or desktop computer input.Vision signal
It include line synchronising signal, field sync signal, R primary colour signal, G primary colour signal and B primary colour signal, signal amplifies distributor circuit point
Other that above-mentioned five kinds of different signals are amplified and exported, frequency switch circuit includes two-way output, all the way for sound pick-up outfit
It uses, is used all the way for sound amplifier, offer teaching audio recording is provided.
Referring to Fig. 1, intelligent switching circuit includes notebook video interface vga1 for connecting with notebook, is used for and platform
Formula computer connection desktop computer video interface vga2, resistance R1 to resistance R9, triode Q1 to triode Q4, diode D1 extremely
Diode D4, the first LED, the 2nd LED, the first relay J1, the second relay J2, third relay J3 and DC power supply
DC, the resistance R1 one end connection notebook video interface detection pin, that is, in Fig. 1 vga1 15 pins, resistance
The other end of R1 and one end of resistance R2 are connect with the base stage of triode Q1, the transmitting of the other end and triode Q1 of resistance R2
It is extremely grounded, the collector of triode Q1 is connect by resistance R3 with the cathode of the first LED 1, one end of resistance R4 and triode
The base stage of Q2 is connect with the anode of the first LED 1, the anode of the other end connection DC power supply DC of resistance R4, the DC power supply
The cathode of DC is grounded；One end of the collector connection resistance R5 of triode Q2, the other end of resistance R5 and the other end of resistance R4
Connection, the cathode of the emitter connection diode D1 of triode Q2, the base stage of the positive connecting triode Q3 of diode D1, three poles
The base stage of the emitter connecting triode Q4 of pipe Q3, the emitter ground connection of triode Q4, the collector connection second of triode Q4
The cathode of LED 2, the anode of the 2nd LED 2 pass through the other end of resistance R6 connection resistance R5；The input of first relay J1
Common end c1 passes through the other end of resistance R7 connection resistance R5, and the input common end c2 of the second relay J2 is connected by resistance R8
The other end of resistance R5, the input common end c3 of third relay J3 pass through the other end of resistance R9 connection resistance R5；Diode
The anode of D2, the anode of diode D3, the anode of diode D4, the first relay J1 output common end d1, the second relay
The output common end d3 of the output common end d2 and third relay J3 of J2 are connect with the collector of triode Q3, diode D2
Cathode connect the input common end c1 of the first relay J1, the input that the cathode of diode D3 connects the second relay J2 is public
Hold c2, the input common end c3 of the cathode connection third relay J3 of diode D4；The normal-closed end a1 of first relay J1, second
The normal-closed end a2 of relay J2, the normal-closed end a3 of third relay J3 are connect with notebook video interface vga1, the first relay
The normally open end b1 of device J1, the normally open end b2 of the second relay J2, third relay J3 normally open end b3 with desktop computer video
Interface vga2 connection, the first relay J1, the second relay J2, third relay J3 are connect with signal amplification distributor circuit；
The third relay J3 is also connected with audio signal switching circuit.
Can be using its test side as address bus signal by the interface configurations principle of notebook, which usually exists
3.5V is known that by the detection to the signal either with or without the upper notebook signal of connection between 5V.When notebook connects upper pen
Remember that this video interface vga1, the level of address bus signal can be transmitted to triode Q1 base stage, triode Q1 conducting, electric current can flow
So that it is shone to the first LED, prompt using notebook signal, when triode Q1 is connected, the base stage electricity of low triode Q2 can be dragged
Pressure increases its collector and emitter resistance, simultaneously because the pressure drop exercising result of diode D1, leads to triode Q3 and three
The cut-off of pole pipe Q4 multiple tube, no current flow through the 2nd LED 2 and three relays, and then the 2nd LED 2 does not shine, three relays
Device is not attracted.At this moment, the normal-closed end of three relays has connected notebook vision signal, and notebook vision signal is transmitted
To the amplification distributor circuit processing of subsequent signal, while the normal-closed end a3 of third relay J3 can also connect notebook audio letter
Number, it is ultimately delivered to two voice frequency terminals.
When not using notebook signal, triode Q1 cut-off, the first LED 1 does not shine, and two triode Q2 are in complete
On state, voltage are higher than the pressure drop of diode D1, cause triode Q3 and triode Q4 multiple tube to be connected, while three relays
Device is attracted, and desktop computer vision signal is connected in normally open end, and desktop computer vision signal is sent to signal amplification distributor circuit
Processing, at this moment correspondingly, desktop computer audio signal is also connected at third relay normally open end, is transferred to two voice frequency terminals.
Referring to fig. 2, signal amplification distributor circuit includes signal amplification chip U1, voltage-stabiliser tube, the first amplifying circuit, second puts
The input terminal Vin of big circuit, third amplifying circuit, the first video output interface, the second video output interface, the voltage-stabiliser tube connects
The other end of connecting resistance R5, the feeder ear 3 of the output end vo ut connection signal amplification chip of voltage-stabiliser tube, the ground terminal Gnd of voltage-stabiliser tube
Ground connection；The first input end 6 of the first output end e1 connection signal amplification chip U1 of the first relay J1, the first relay
First output end e2 of the second input terminal 7 of the second output terminal f1 connection signal amplification chip U1 of J1, the second relay J2 connects
Connect the input terminal of the first amplifying circuit, the input terminal of second output terminal f2 the second amplifying circuit of connection of the second relay J2,
The input terminal of the output end e3 connection third amplifying circuit of three relay J3, the first output end 4 of the signal amplification chip U1,
Second output terminal 5, the output end of the first amplifying circuit, the output end of the second amplifying circuit, the third of signal amplification chip U1 is put
The output end of big circuit is connect with the first video output interface vga3, the second video output interface vga4.Here, wherein amplifying
The first output end 4 the first video output interface of connection of chip U1, the second video output interface of connection of second output terminal 5, three
The output end of amplifying circuit and two video output interfaces all connect, and the first video output interface vga3 is exported to display, the
Two video output interface vga4 are exported to projector.
The composition component of first amplifying circuit, the second amplifying circuit and third amplifying circuit can be identical, the present embodiment
In, it include capacitor C1, capacitor C2, resistance R10 to resistance 18, triode Q5 to triode Q8.For the first amplifying circuit
Speech, one end of capacitor C1 connect the first output end e2 of the second relay J2, one end of resistance R10 and one end, the electricity of resistance R11
The other end for holding C1 is connect with the base stage of triode Q5, the input terminal Vin of the other end connection voltage-stabiliser tube of resistance R10, resistance
The other end of R11 is grounded；The collector of triode Q5 and one end of resistance R12 are connect with the base stage of triode Q6, resistance R12
The other end connection resistance R10 the other end, the emitter of triode Q5 and one end of resistance R13 pass through resistance R14 and are grounded；
The other end of resistance R13 and the collector of triode Q6 are connect with the base stage of triode Q7, and one end of resistance R15 connects three poles
One end of the emitter of pipe Q6, the other end of resistance R15, the collector of triode Q7 and resistance R16 is another with resistance R12
End connection；The emitter of triode Q7 and one end of resistance R17 pass through resistance R18 and are grounded；The other end connection three of resistance R17
The base stage of pole pipe Q8, the other end of resistance R16 and one end of capacitor C2 are connect with the emitter of triode Q8, triode Q8's
Grounded collector；The first video output interface vga3 and the second video output interface vga4 connects with the other end of capacitor C2
It connects.For the second amplifying circuit, what difference was only that one end connection of capacitor C1 is the second output of the second relay J2
F2 is held, and for third amplifying circuit, difference is only that the output end e3 of one end connection third relay J2 of capacitor C1.
The model of signal amplification chip is preferably HD74LS244P.
Since vision signal includes line synchronising signal, field sync signal, R primary colour signal, G primary colour signal and B primary colours letter
Number, vision signal is allocated to display and projector, and projector is usually to lift on the ceiling, is usually thrown
The cabling of shadow machine to computer is differed at 12 to 30 meters, and in order to meet the transmission of video of long range, the present invention relates to three poles of level Four
Pipe amplifying circuit amplifies, to guarantee have enough signal output amplitudes to go to transmit, not will lead to brightness decay thus,
Also interference of the drop clutter to signal simultaneously.Due to field sync signal, the frequency of line synchronising signal and red, green, blue primary colour signal and
Peak value is different, also for the complexity and save the cost for reducing circuit, using HD74LS244P integrated circuit to field sync signal and
Line synchronising signal is amplified and is distributed.It is 5V since HD74LS244P requires supply voltage, installs a 5V tri- additional in the front
Terminal circuit voltage-stabiliser tube powers again to voltage pressure stabilizing to HD74LS244P.6 line of input of first input end of signal amplification chip U1 is same
Signal is walked, the second input terminal 7 inputs field sync signal, and the first amplifying circuit is amplified and distributed to R primary colour signal, and second puts
Big circuit is amplified and is distributed to G primary colour signal, and third amplifying circuit is amplified and distributed to B primary colour signal.After amplification
Tristimulus signals be redistributed to two-way output, exported all the way to display, exported all the way to projector.
Referring to Fig. 3, audio signal switching circuit includes notebook audio input for connecting with notebook, is used for and platform
The desktop computer audio input of formula computer connection, sound amplifier, sound pick-up outfit, the notebook audio input connect third relay
The normal-closed end a3 of J3, desktop computer audio input connect the normally open end b3 of third relay J3, the sound amplifier and sound pick-up outfit
With the connection of the output end e3 of third relay J3.
Since people does not have that vision signal is sensitive to the reaction of audio signal superiority and inferiority, if audio signal noise in certain lower limit,
Distortion is not serious, and volume is loud enough, generally all meets the needs of teaching.The present embodiment is by the audio signal of input by the
The switching of three relays is directly sent to output end, since line resistance is small, does not generate any influence to audio, need not also put
Greatly, in order to which for audio recording of imparting knowledge to students, design two-way exports audio device, uses all the way for sound pick-up outfit, uses all the way for sound amplifier.
It will be apparent to those skilled in the art that can make various other according to the above description of the technical scheme and ideas
Corresponding change and deformation, and all these changes and deformation all should belong to the protection scope of the claims in the present invention
Within.
Claims (7)
1. a kind of intelligent multimedia signal shifter, which is characterized in that including signal amplification distributor circuit, audio signal switching electricity
Road, intelligent switching circuit, the signal amplification distributor circuit and audio signal switching circuit connect with intelligent switching circuit, believe
Number amplification distributor circuit respectively carries out line synchronising signal, field sync signal, R primary colour signal, G primary colour signal and B primary colour signal
Amplify and export, the intelligence switching circuit includes notebook video interface for connecting with notebook, is used for and desktop
Desktop computer video interface, the resistance R1 to resistance R9, triode Q1 to triode Q4, diode D1 to diode of brain connection
D4, the first LED, the 2nd LED, the first relay, the second relay, third relay and DC power supply, the resistance R1's
One end connects the detection pin of notebook video interface, the base of the other end of resistance R1 and one end of resistance R2 with triode Q1
Pole connection, the other end of resistance R2 and the emitter of triode Q1 be grounded, and the collector of triode Q1 passes through resistance R3 and the
The cathode of one LED connects, and one end of resistance R4 and the base stage of triode Q2 are connect with the anode of the first LED, and resistance R4's is another
One end connects the anode of DC power supply, the cathode ground connection of the DC power supply；One end of the collector connection resistance R5 of triode Q2,
The other end of resistance R5 is connect with the other end of resistance R4, the cathode of the emitter connection diode D1 of triode Q2, diode
The base stage of the positive connecting triode Q3 of D1, the base stage of the emitter connecting triode Q4 of triode Q3, the transmitting of triode Q4
Pole ground connection, the collector of triode Q4 connect the cathode of the 2nd LED, and the anode of the 2nd LED passes through resistance R6 connection resistance R5
The other end；The input common end of first relay passes through the other end of resistance R7 connection resistance R5, the input of the second relay
Common end passes through the other end of resistance R8 connection resistance R5, and the input common end of third relay passes through resistance R9 connection resistance R5
The other end；The anode of diode D2, the anode of diode D3, the anode of diode D4, the first relay output common end,
The output common end of second relay and the output common end of third relay are connect with the collector of triode Q3, diode
The cathode of D2 connects the input common end of the first relay, and the cathode of diode D3 connects the input common end of the second relay,
The input common end of the cathode connection third relay of diode D4；The normal-closed end of first relay, the second relay it is normally closed
End, third relay normal-closed end connect with notebook video interface, the normally open end of the first relay, the second relay it is normal
Beginning, third relay normally open end connect with desktop computer video interface, the first relay, the second relay, third after
Electric appliance is connect with signal amplification distributor circuit；The third relay is also connected with audio signal switching circuit.
2. intelligent multimedia signal shifter as described in claim 1, which is characterized in that the signal amplifies distributor circuit packet
Signal amplification chip, voltage-stabiliser tube, the first amplifying circuit, the second amplifying circuit, third amplifying circuit, the first video is included to export and connect
Mouth, the second video output interface, the other end of the input terminal connection resistance R5 of the voltage-stabiliser tube, the output end of voltage-stabiliser tube connect letter
The feeder ear of number amplification chip, the ground terminal ground connection of voltage-stabiliser tube；First output end connection signal of first relay amplifies core
The first input end of piece, the second input terminal of the second output terminal connection signal amplification chip of the first relay, the second relay
The first output end connect the input terminal of the first amplifying circuit, the second output terminal of the second relay connects the second amplifying circuit
Input terminal, the input terminal of the output end connection third amplifying circuit of third relay, the first output of the signal amplification chip
The first video output interface of end connection, the second output terminal of signal amplification chip connect the second video output interface, the first amplification
The output end of circuit, the output end of the second amplifying circuit, third amplifying circuit output end with the first video output interface,
The connection of two video output interfaces.
3. intelligent multimedia signal shifter as claimed in claim 2, which is characterized in that the model of the signal amplification chip
For HD74LS244P.
4. intelligent multimedia signal shifter as claimed in claim 2, which is characterized in that first amplifying circuit includes electricity
Hold C1, capacitor C2, resistance R10 to resistance 18, triode Q5 to triode Q8, one end of capacitor C1 connects the of the second relay
One end of one output end, one end of resistance R10 and resistance R11, the other end of capacitor C1 are connect with the base stage of triode Q5, electricity
Hinder the input terminal of the other end connection voltage-stabiliser tube of R10, the other end ground connection of resistance R11；The collector and resistance R12 of triode Q5
One end connect with the base stage of triode Q6, the other end of the other end of resistance R12 connection resistance R10, the hair of triode Q5
One end of emitter-base bandgap grading and resistance R13 pass through resistance R14 and are grounded；The collector of the other end of resistance R13 and triode Q6 are with three
The base stage of pole pipe Q7 connects, the emitter of one end connecting triode Q6 of resistance R15, the other end of resistance R15, triode Q7
One end of collector and resistance R16 are connect with the other end of resistance R12；The emitter of triode Q7 and one end of resistance R17
It is grounded by resistance R18；The base stage of the other end connecting triode Q8 of resistance R17, the other end of resistance R16 and capacitor C2's
One end is connect with the emitter of triode Q8, the grounded collector of triode Q8；First video output interface and second
Video output interface is connect with the other end of capacitor C2.
5. intelligent multimedia signal shifter as claimed in claim 2, which is characterized in that second amplifying circuit includes electricity
Hold C1, capacitor C2, resistance R10 to resistance 18, triode Q5 to triode Q8, one end of capacitor C1 connects the of the second relay
One end of two output ends, one end of resistance R10 and resistance R11, the other end of capacitor C1 are connect with the base stage of triode Q5, electricity
Hinder the input terminal of the other end connection voltage-stabiliser tube of R10, the other end ground connection of resistance R11；The collector and resistance R12 of triode Q5
One end connect with the base stage of triode Q6, the other end of the other end of resistance R12 connection resistance R10, the hair of triode Q5
One end of emitter-base bandgap grading and resistance R13 pass through resistance R14 and are grounded；The collector of the other end of resistance R13 and triode Q6 are with three
The base stage of pole pipe Q7 connects, the emitter of one end connecting triode Q6 of resistance R15, the other end of resistance R15, triode Q7
One end of collector and resistance R16 are connect with the other end of resistance R12；The emitter of triode Q7 and one end of resistance R17
It is grounded by resistance R18；The base stage of the other end connecting triode Q8 of resistance R17, the other end of resistance R16 and capacitor C2's
One end is connect with the emitter of triode Q8, the grounded collector of triode Q8；First video output interface and second
Video output interface is connect with the other end of capacitor C2.
6. intelligent multimedia signal shifter as claimed in claim 2, which is characterized in that the third amplifying circuit includes electricity
Hold C1, capacitor C2, resistance R10 to resistance 18, triode Q5 to triode Q8, one end of capacitor C1 connects the defeated of third relay
One end of outlet, one end of resistance R10 and resistance R11, the other end of capacitor C1 are connect with the base stage of triode Q5, resistance
The input terminal of the other end connection voltage-stabiliser tube of R10, the other end ground connection of resistance R11；The collector of triode Q5 and resistance R12's
One end is connect with the base stage of triode Q6, the other end of the other end connection resistance R10 of resistance R12, the transmitting of triode Q5
Pole and one end of resistance R13 pass through resistance R14 and are grounded；The collector of the other end of resistance R13 and triode Q6 with three poles
The base stage of pipe Q7 connects, the emitter of one end connecting triode Q6 of resistance R15, the collection of the other end of resistance R15, triode Q7
One end of electrode and resistance R16 are connect with the other end of resistance R12；The emitter of triode Q7 and one end of resistance R17 are equal
It is grounded by resistance R18；The one of the base stage of the other end connecting triode Q8 of resistance R17, the other end of resistance R16 and capacitor C2
End is connect with the emitter of triode Q8, the grounded collector of triode Q8；First video output interface and the second view
Frequency output interface is connect with the other end of capacitor C2.
7. intelligent multimedia signal shifter as claimed in claim 2, which is characterized in that the audio signal switching circuit packet
It includes the notebook audio input for connecting with notebook, the desktop computer audio input for being connect with desktop computer, amplify
Machine, sound pick-up outfit, the normal-closed end of the notebook audio input connection third relay, desktop computer audio input connect third
The normally open end of relay, the connection of the sound amplifier and sound pick-up outfit with the output end of third relay.
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| CN201610041609.2A CN105491305B (en) | 2016-01-21 | 2016-01-21 | A kind of intelligent multimedia signal shifter |
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| CN201610041609.2A CN105491305B (en) | 2016-01-21 | 2016-01-21 | A kind of intelligent multimedia signal shifter |
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| CN105491305B true CN105491305B (en) | 2019-03-29 |
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| CN110209371B (en) * | 2019-05-16 | 2022-09-06 | 广州视源电子科技股份有限公司 | Audio compatible circuit and video and audio equipment |
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|---|---|---|---|---|
| US5686974A (en) * | 1995-06-21 | 1997-11-11 | Sony Corporation | Method of and apparatus for providing a high speed video switch |
| CN2791777Y (en) * | 2005-04-15 | 2006-06-28 | 张其海 | Control system of multi-media platform |
| CN201255921Y (en) * | 2007-12-21 | 2009-06-10 | 大连理工大学 | Intelligent multimedia central controller |
| CN104618678A (en) * | 2015-02-09 | 2015-05-13 | 李鑫建 | System capable of automatically identifying external connecting environment of HDMI |
| CN205304962U (en) * | 2016-01-21 | 2016-06-08 | 广州番禺职业技术学院 | Intelligence multimedia signal switch |
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2016
- 2016-01-21 CN CN201610041609.2A patent/CN105491305B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5686974A (en) * | 1995-06-21 | 1997-11-11 | Sony Corporation | Method of and apparatus for providing a high speed video switch |
| CN2791777Y (en) * | 2005-04-15 | 2006-06-28 | 张其海 | Control system of multi-media platform |
| CN201255921Y (en) * | 2007-12-21 | 2009-06-10 | 大连理工大学 | Intelligent multimedia central controller |
| CN104618678A (en) * | 2015-02-09 | 2015-05-13 | 李鑫建 | System capable of automatically identifying external connecting environment of HDMI |
| CN205304962U (en) * | 2016-01-21 | 2016-06-08 | 广州番禺职业技术学院 | Intelligence multimedia signal switch |
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