CN201690531U - Vehicle-mounted VGA with audio matrix switching device - Google Patents
Vehicle-mounted VGA with audio matrix switching device Download PDFInfo
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- CN201690531U CN201690531U CN2010200376337U CN201020037633U CN201690531U CN 201690531 U CN201690531 U CN 201690531U CN 2010200376337 U CN2010200376337 U CN 2010200376337U CN 201020037633 U CN201020037633 U CN 201020037633U CN 201690531 U CN201690531 U CN 201690531U
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Abstract
The utility model discloses a vehicle-mounted VGA with an audio matrix switching device, which comprises a PC control module, a switching power supply module, a VGA signal switching module, an audio signal switching module and a central display control module, wherein switching chips for processing line and field synchronous digital signals in the VGA signal switching module are AD8109 analog switching chips respectively, the analog switching chip for processing RGB is the AD8109 analog switching chip, simultaneously, a correction capacitor C is added in a line and field synchronous signal input digital processing circuit, a line and field synchronous signal output digital processing circuit is improved, and the analog switching chip in the audio signal switching module is an AD8114 chip. Due to the adoption of the vehicle-mounted VGA with the audio matrix switching device, images are ensured not to be blurred while the requirements on synchronization and temperature are met; in addition, an audio signal input and output interface in the audio signal switching module is a BNC interface, thereby being suitable for working stably under vehicle-mounted and high-vibration conditions.
Description
Technical field
The utility model belongs to looks audio area, relates to a kind of VGA matrix switcher, particularly a kind of vehicle-mounted VGA band Audio Matrix switch.
Background technology
Existing VGA band Audio Matrix switch, formation mainly comprises PC (personal computer) control module, switch power module, VGA signal handover module, audio signal handover module and central display control module.It mainly is VGA signal (a kind of video signal format that is used for computer, common signal as the output of computer video card) and the audio signal matrix switch equipment redistributing and make up, any one or more that this equipment can switch to output channel with the VGA signal and the audio signal on any road gets on.The mode of its work is: central display control module is after receiving the PC control signal, switching command is transferred to (numeral switches chip and chip is switched in simulation) on the switching chip in VGA signal handover module and the audio frequency handover module by the control link, these switch chip makes the switching reaction according to control command, then treated digital and analog signaling is switched on corresponding digital circuit and the analog circuit, and, finish corresponding switching by the external interface RCA socket output that VGA is with the Audio Matrix switch.
The VGA signal is made up of line synchronizing signal, field sync signal, R signal (danger signal), G signal (green), B signal (blue signal), wherein line synchronizing signal and field sync signal are that the digital signal of Transistor-Transistor Logic level is used for synchronously, and R signal, B signal and G signal are the sign that analog signal is used for color and brightness.The VGA matrix switcher switches the VGA signal that receives respectively simultaneously, is combined into one the tunnel at its output then and outputs on the display.Thereby reach the purpose of switching.Audio signal is made up of left and right sound track signals.
But owing to existing VGA band Audio Matrix switch has the following disadvantages: it is higher for numeral switching chip cost that the field sync signal of 1, going in the VGA signal handover module is transmitted employed switching chip, the digital processing circuit that it connected is when handling digital TTL signal, can not solve digital signal distortion, cause in the switching of VGA signal, often occurring to a certain degree image blurring; 2, used switching chip can not satisfy the requirement of the environmental suitability of land transport among-20 ℃-+70 ℃ operating temperature range and the GJB150-86 in existing VGA signal handover module, the audio signal handover module; 3, because audio signal handover module external interface adopts is the RCA socket, the RCA socket itself only depends on fastening force to come fastening plug, does not have fastener, is not suitable for using under the vehicle-mounted equal altitudes vibration environment.So work that feasible existing VGA band Audio Matrix switch can not be stable under vehicle-mounted and high vibration condition.
Summary of the invention
The purpose of this utility model is intended to overcome deficiency of the prior art, and a kind of vehicle-mounted VGA band Audio Matrix switch is provided.
Content of the present utility model is: a kind of vehicle-mounted VGA band Audio Matrix switch comprises: the PC control module; Switch power module; By line synchronizing signal input digit treatment circuit (1), line synchronizing signal output digital processing circuit (2), field sync signal input digit treatment circuit (4), field sync signal output digital processing circuit (5), be used to handle the numeral switching chip (3) of capable synchronous digital signal, be used to handle the numeral switching chip (6) of field synchronization digital signal, R signal input analog processing circuit (7), R signal output analog processing circuit (8), G signal input analog processing circuit (10), G signal output analog processing circuit (11), B signal input analog processing circuit (13), B signal output analog processing circuit (14), and the simulation switching chip (9) that is used to handle colour-video signal R, be used to handle the simulation switching chip (12) of colour-video signal G, the VGA signal handover module that chip (15) is formed is switched in the simulation that is used to handle colour-video signal B; Audio signal handover module and central display control module, numeral in the described VGA signal handover module is switched chip (3) and is switched chip for the AD8109 simulation, described numeral is switched chip (6) and is AD8109 simulation switching chip, and chip (9) is switched in described simulation, chip (12) is switched in simulation and simulation switching chip (15) switches chip for the AD8109 simulation;
Line synchronizing signal input digit treatment circuit (1) is made up of resistance R 3, R4, R5 and capacitor C 1 in the described VGA signal handover module, after described resistance R 3 and capacitor C 1 are in parallel, one end links to each other with the line synchronizing signal of input, the other end links to each other with resistance R 4, input with numeral switching chip (3) after the other end of resistance R 4 links to each other with resistance R 5 links to each other the other end ground connection of resistance R 5;
Field sync signal input digit treatment circuit (4) is made up of resistance R 6, R7, R8 and capacitor C 2 respectively in the described VGA signal handover module, after described resistance R 6 and capacitor C 2 are in parallel, one end links to each other with the field sync signal of input, the other end links to each other with resistance R 7, input with numeral switching chip (6) after the other end of resistance R 7 links to each other with resistance R 8 links to each other the other end ground connection of resistance R 8;
Line synchronizing signal output digital processing circuit (2) is made up of resistance R 1, R2 and not gate (16), (17), (18), (19) in the described VGA signal handover module, one end of described resistance R 1 switches chip (3) output with numeral and links to each other, the input of other end NAND gate (16) links to each other, the output of described not gate (16) links to each other with the input of in parallel not gate (17), (18), (19), the output of the not gate of described parallel connection (17), (18), (19) links to each other with resistance R 2, the output of another termination row synchronous digital signal of resistance R 2;
Field sync signal output digital processing circuit (5) is made up of resistance R 9, R10 not gate (20), (21), (22), (23) in the described VGA signal handover module, one end of described resistance R 9 switches chip (6) output with numeral and links to each other, the input of other end NAND gate (20) links to each other, the output of described not gate (20) links to each other with the input of in parallel not gate (21), (22), (23), the output of the not gate of described parallel connection (21), (22), (23) links to each other with resistance R 10, the output of another termination field synchronization digital signal of resistance R 10;
Simulation switching chip is the AD8114 chip in the described audio signal handover module.
In the utility model content: the input/output interface of the audio signal in the audio signal handover module has adopted BNC connector.
In the utility model content: the chip that described central display control module adopts is the STC-89C52 chip.
In the utility model content: described not gate (16), not gate (20) are Schmidt's not gate, and described not gate (17), (18), (19) (21), (22), (23) are the 74ACT04 not gate.
Compared with prior art, the beneficial effects of the utility model are: owing to used row of the present utility model, the field sync signal input, the output digital processing circuit, switch chip AD8109 with simulation simultaneously and replaced original switching chip in the VGA signal handover module, simulation switching chip has adopted the AD8114 chip so satisfying synchronously and ensureing in the temperature requirement that image does not blur in the audio signal handover module, the input/output interface of the audio signal in the audio signal handover module is a BNC connector in addition, so the stable work under vehicle-mounted and high vibration condition that suits.
Description of drawings
Fig. 1 is the utility model embodiment circuit block diagram;
Fig. 2 is a line synchronizing signal input digit treatment circuit in the VGA signal handover module among the utility model embodiment;
Fig. 3 is a field sync signal input digit treatment circuit in the VGA signal handover module among the utility model embodiment;
Fig. 4 is a line synchronizing signal output digital processing circuit in the VGA signal handover module among the utility model embodiment.
Fig. 5, be field sync signal output digital processing circuit in the VGA signal handover module among the utility model embodiment.
1-line synchronizing signal input digit treatment circuit among the figure, 2-line synchronizing signal output digital processing circuit, the 3-numeral is switched chip, 4-field sync signal input digit treatment circuit, 5-field step logarithmic output signal word processing circuit, the 6-numeral is switched chip, chip is switched in the 9-simulation, and chip is switched in the 12-simulation, and chip is switched in the 15-simulation, the 16-not gate, 17-not gate, 18-not gate, the 19-not gate, the 20-not gate, 21-not gate, 22-not gate 23-not gate.
Embodiment:
Below in conjunction with accompanying drawing the utility model is further described.
In Fig. 1, a kind of vehicle-mounted VGA band Audio Matrix switch comprises: the PC control module; Switch power module; By line synchronizing signal input digit treatment circuit 1, line synchronizing signal output digital processing circuit 2, field sync signal input digit treatment circuit 4, field sync signal output digital processing circuit 5, be used to handle the numeral switching chip 3 of capable synchronous digital signal, be used to handle the numeral switching chip 6 of field synchronization digital signal, R signal input analog processing circuit 7, R signal output analog processing circuit 8, G signal input analog processing circuit 10, G signal output analog processing circuit 11, B signal input analog processing circuit 13, B signal output analog processing circuit 14, and the simulation switching chip 9 that is used to handle colour-video signal R, be used to handle the simulation switching chip 12 of colour-video signal G, the VGA signal handover module that chip 15 is formed is switched in the simulation that is used to handle colour-video signal B; Audio signal handover module and central display control module, numeral in the VGA signal handover module is switched chip 3 and is switched chip for the AD8109 simulation, it is that AD8109 simulates the switching chip that numeral is switched chip 6, simulates to switch chip 9, simulation switching chip 12 and simulate switching chip 15 to switch chip for the AD8109 simulation;
Simulation switching chip is the AD8114 chip in the audio signal handover module.The chip that central authorities' display control module adopts is the STC-89C52 chip.The input/output interface of the audio signal in the audio signal handover module has adopted BNC connector.
In Fig. 2, line synchronizing signal input digit treatment circuit 1 is made up of resistance R 3, R4, R5 and capacitor C 1 in the VGA signal handover module, after resistance R 3 and capacitor C 1 are in parallel, one end links to each other with the line synchronizing signal of input respectively, the other end links to each other with resistance R 4, input with numeral switching chip 3 after the other end of resistance R 4 links to each other with resistance R 5 links to each other the other end ground connection of resistance R 5.Wherein resistance R 3 is 0 Ω, and resistance R 4, R5 are 75 Ω.Capacitor C 1 is 0.01 μ F.
When row field sync signal during through the capacitor C 1 of oversampling circuit, because the integration performance that electric capacity possesses, and with the bandpass filtering performance that resistance R 3 is combined to form, the line synchronizing signal time delay that will pass through is proofreaied and correct.Simultaneously, filtering clutter composition wherein.The collocation of resistance R 4 and resistance R 5 mainly is to be connected with the switching chip to be equipped with, and reaches required effect.
In Fig. 3, field sync signal input digit treatment circuit 4 is made up of resistance R 6, R7, R8 and capacitor C 2 respectively in the VGA signal handover module, after resistance R 6 and capacitor C 2 are in parallel, one end links to each other with the field sync signal of input, the other end links to each other with resistance R 7, input with numeral switching chip 6 after the other end of resistance R 7 links to each other with resistance R 8 links to each other the other end ground connection of resistance R 8.Wherein resistance R 6 is 0 Ω, and resistance R 7, R8 are 75 Ω.Capacitor C 2 is 0.01 μ F.
When row field sync signal during through the capacitor C 2 of oversampling circuit, because the integration performance that electric capacity possesses, and with the bandpass filtering performance that resistance R 6 is combined to form, the field sync signal time delay that will pass through is proofreaied and correct.Simultaneously, filtering clutter composition wherein.The collocation of resistance R 7 and resistance R 8 mainly is to be connected with the switching chip to be equipped with, and reaches required effect.
In Fig. 4, line synchronizing signal output digital processing circuit 2 is made up of resistance R 1, R2 and not gate 16,17,18,19 in the VGA signal handover module, one end of described resistance R 1 switches chip 3 outputs with numeral and links to each other, the input of other end NAND gate 16 links to each other, the output of not gate 16 links to each other with the input of the not gate of parallel connection 17,18,19, the output of not gate 17,18,19 in parallel links to each other the output of another termination row synchronous digital signal of resistance R 2 with resistance R 2;
In Fig. 5, field sync signal output digital processing circuit 5 is made up of resistance R 9, R10 not gate 20,21,22,23 in the VGA signal handover module, one end of resistance R 9 switches chip 6 outputs with numeral and links to each other, the input of other end NAND gate 20 links to each other, the output of not gate 20 links to each other with the input of the not gate of parallel connection 21,22,23, the output of not gate 21,22,23 in parallel links to each other the output of another termination field synchronization digital signal of resistance R 10 with resistance R 10; In Fig. 4, Fig. 5, owing to there is the bandwidth problem that switches chip, can cause row or the field sync signal of switching chip output that ringing is arranged, shake can appear in image.So row, field sync signal output digital processing circuit have used Schmidt's not gate 16,20 in this VGA signal handover module, to eliminate ring, correction signal.Use not gate 17,18,19,21,22 and 23 that waveform is reversed simultaneously, increase driving force simultaneously.Resistance R 2, R10 play the effect with outside coupling.
Not gate 16 and not gate 20 are Schmidt's not gate, and described not gate 17,18,19,21,22,23 is the 74ACT04 not gate.
The course of work of whole vehicle-mounted VGA band Audio Matrix switch: after vehicle-mounted VGA band Audio Matrix switch connects the power supply of 220V/AC, power supply becomes voltage transitions ± 5V through switch power module, gives PC control module, central display control module, VGA signal handover module, the power supply of audio signal handover module respectively.The VGA signal and the audio signal (left and right sound track signals) of input are admitted to VGA handover module and audio frequency handover module respectively.232 control signals are converted to control signal behind the Transistor-Transistor Logic level or the control signal of panel (being positioned on the central display control module) through the PC control module, after central display control module identification, be converted to the control signal that VGA handover module and audio frequency handover module can be discerned.Control VGA handover module and audio frequency handover module switch to the outlet terminal that needs with the VGA signal and the audio signal of input, thereby finish the function of VGA switch.
Claims (4)
1. a vehicle-mounted VGA band Audio Matrix switch comprises: the PC control module; Switch power module; By line synchronizing signal input digit treatment circuit (1), line synchronizing signal output digital processing circuit (2), field sync signal input digit treatment circuit (4), field sync signal output digital processing circuit (5), be used to handle the numeral switching chip (3) of capable synchronous digital signal, be used to handle the numeral switching chip (6) of field synchronization digital signal, R signal input analog processing circuit (7), R signal output analog processing circuit (8), G signal input analog processing circuit (10), G signal output analog processing circuit (11), B signal input analog processing circuit (13), B signal output analog processing circuit (14), and the simulation switching chip (9) that is used to handle colour-video signal R, be used to handle the simulation switching chip (12) of colour-video signal G, the VGA signal handover module that chip (15) is formed is switched in the simulation that is used to handle colour-video signal B; Audio signal handover module and central display control module, it is characterized in that: the numeral in the described VGA signal handover module is switched chip (3) and is switched chip for the AD8109 simulation, described numeral is switched chip (6) and is AD8109 simulation switching chip, and chip (9) is switched in described simulation, chip (12) is switched in simulation and simulation switching chip (15) switches chip for the AD8109 simulation;
Line synchronizing signal input digit treatment circuit (1) is made up of resistance R 3, R4, R5 and capacitor C 1 in the described VGA signal handover module, after described resistance R 3 and capacitor C 1 are in parallel, one end links to each other with the line synchronizing signal of input, the other end links to each other with resistance R 4, input with numeral switching chip (3) after the other end of resistance R 4 links to each other with resistance R 5 links to each other the other end ground connection of resistance R 5;
Field sync signal input digit treatment circuit (4) is made up of resistance R 6, R7, R8 and capacitor C 2 respectively in the described VGA signal handover module, after described resistance R 6 and capacitor C 2 are in parallel, one end links to each other with the field sync signal of input, the other end links to each other with resistance R 7, input with numeral switching chip (6) after the other end of resistance R 7 links to each other with resistance R 8 links to each other the other end ground connection of resistance R 8;
Line synchronizing signal output digital processing circuit (2) is made up of resistance R 1, R2 and not gate (16,17,18,19) in the described VGA signal handover module, one end of described resistance R 1 switches chip (3) output with numeral and links to each other, the input of other end NAND gate (16) links to each other, the output of described not gate (16) links to each other with the input of the not gate (17,18,19) of parallel connection, the output of the not gate of described parallel connection (17,18,19) links to each other with resistance R 2, the output of another termination row synchronous digital signal of resistance R 2;
Field sync signal output digital processing circuit (5) is made up of resistance R 9, R10 not gate (20,21,22,23) in the described VGA signal handover module, one end of described resistance R 9 switches chip (6) output with numeral and links to each other, the input of other end NAND gate (20) links to each other, the output of described not gate (20) links to each other with the input of the not gate (21,22,23) of parallel connection, the output of the not gate of described parallel connection (21,22,23) links to each other with resistance R 10, the output of another termination field synchronization digital signal of resistance R 10;
Simulation switching chip is the AD8114 chip in the described audio signal handover module.
2. a kind of vehicle-mounted VGA band Audio Matrix switch according to claim 1, it is characterized in that: the input/output interface of the audio signal in the described audio signal handover module is a BNC connector.
3. a kind of vehicle-mounted VGA band Audio Matrix switch according to claim 1, it is characterized in that: the chip that described central display control module adopts is the STC-89C52 chip.
4. a kind of vehicle-mounted VGA band Audio Matrix switch according to claim 1, it is characterized in that: described not gate (16), not gate (20) are Schmidt's not gate, and described not gate (17,18,19,21,22,23) is the 74ACT04 not gate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200376337U CN201690531U (en) | 2010-01-11 | 2010-01-11 | Vehicle-mounted VGA with audio matrix switching device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200376337U CN201690531U (en) | 2010-01-11 | 2010-01-11 | Vehicle-mounted VGA with audio matrix switching device |
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| Publication Number | Publication Date |
|---|---|
| CN201690531U true CN201690531U (en) | 2010-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010200376337U Expired - Fee Related CN201690531U (en) | 2010-01-11 | 2010-01-11 | Vehicle-mounted VGA with audio matrix switching device |
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| CN (1) | CN201690531U (en) |
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- 2010-01-11 CN CN2010200376337U patent/CN201690531U/en not_active Expired - Fee Related
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101229 Termination date: 20150111 |
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| EXPY | Termination of patent right or utility model |