CN209517353U - A kind of differential signal filter circuit and differential signal processor - Google Patents
A kind of differential signal filter circuit and differential signal processor Download PDFInfo
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- CN209517353U CN209517353U CN201920557418.0U CN201920557418U CN209517353U CN 209517353 U CN209517353 U CN 209517353U CN 201920557418 U CN201920557418 U CN 201920557418U CN 209517353 U CN209517353 U CN 209517353U
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- 238000001914 filtration Methods 0.000 claims description 42
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- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000011324 bead Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 230000036039 immunity Effects 0.000 abstract description 16
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 239000011162 core material Substances 0.000 description 3
- 239000004579 marble Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 1
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- 230000002452 interceptive effect Effects 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
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Abstract
The utility model discloses a kind of differential signal filter circuit and differential signal processors.Differential signal filter circuit includes differential signal outputs mouth, analog references ground port, common mode inductance and at least two stage filter sub-circuit.Differential signal outputs mouth is electrically connected with common mode inductance, analog references port be electrically connected at least two stage filter sub-circuit.It is filtered by the differential signal that common mode inductance exports differential signal outputs mouth, the at least two stage filter sub-circuit reference potential signal that analog references port exports is filtered simultaneously, the electromagnetic immunity that differential signal outputs mouth can be improved makes differential signal outputs mouth meet the electromagnetic immunity test request of national military standard.
Description
Technical field
The utility model embodiment is related to signal processing technology field more particularly to a kind of differential signal filter circuit and difference
Sub-signal processor.
Background technique
With the rapid development of Airborne Video System technology, the video display system with good human-computer interaction function flies in the modern times
Occupy increasingly consequence in the airborne electronic equipment system of machine.Extended VGA (Extended Graphics
Array, XGA) it is used as a kind of digital video technology, it can satisfy the transmission requirement of Airborne Video System technology, in modern aircraft
To being widely used.
XGA vision signal is transmitted using three-wire system, i.e., row, field sync signal is converted into common mode letter by particular transform
It number is added to red (R), transmitted on green (G) and blue (B) differential signal.And R, G and B differential signal are by digital-to-analogue conversion
Device provides, and has the characteristics that signal message amount is big, signal voltage amplitude is low, therefore be highly susceptible to the dry of external electromagnetic noise
It disturbs, leads to the decline of signal transmission quality.
Utility model content
The utility model provides a kind of differential signal filter circuit and differential signal processor, to improve differential signal output
The transmission quality of port meets the electromagnetic immunity test request of national military standard.
In a first aspect, the utility model embodiment provides a kind of differential signal filter circuit, including differential signal output
Port, analog references ground port, common mode inductance and at least two stage filter sub-circuit；
The differential signal outputs mouth is electrically connected with the common mode inductance, the analog references port and it is described at least
The electrical connection of two stage filter sub-circuit.
Optionally, at least two stage filter sub-circuit includes that first order filtering sub-circuit and the second level filter sub-circuit,
The first order filtering sub-circuit and second level filtering sub-circuit are L-type filter circuit.
Optionally, the first order filtering sub-circuit includes the first inductive element and first capacitor, the second level filtering
Sub-circuit includes the second inductive element and the second capacitor；
With the analog references port is electrically connected the first end of first inductive element, first inductive element
Second end is electrically connected with the first end of the first end of the first capacitor and second inductive element, the first capacitor
Second end with casing is electrically connected, and the second end of second inductive element is electrically connected with the first end of second capacitor, institute
State the second end of the second capacitor be digitally electrically connected.
Optionally, first inductive element and second inductive element are high frequency magnetic bead.
Optionally, the difference of the capacitance of the first capacitor and the capacitance of second capacitor is 100 times.
Optionally, differential signal filter circuit further includes first resistor；The first end of the first resistor and described second
The second end of inductive element is electrically connected, and the second end of the first resistor is the ground terminal output end of the differential signal filter circuit
Mouthful.
Optionally, the resistance value of the first resistor is less than or equal to 500 ohm.
Optionally, the differential signal outputs mouth includes the first differential signal outputs mouth, the output of the second differential signal
Port and third differential signal outputs mouth；The common mode inductance includes that the first common mode inductance, the second common mode inductance and third are total
Mould inductance；
The positive output end of the first differential signal outputs mouth and the first input end of first common mode inductance are electrically connected
It connects, the negative output terminal of the first differential signal outputs mouth is electrically connected with the second input terminal of first common mode inductance；
The positive output end of the second differential signal outputs mouth and the first input end of second common mode inductance are electrically connected
It connects, the negative output terminal of the second differential signal outputs mouth is electrically connected with the second input terminal of second common mode inductance；
The positive output end of the third differential signal outputs mouth and the first input end of the third common mode inductance are electrically connected
It connects, the negative output terminal of the third differential signal outputs mouth is electrically connected with the second input terminal of the third common mode inductance.
Optionally, the DCR value of the common mode inductance is less than or equal to 0.5 ohm.
Second aspect, the utility model embodiment additionally provide a kind of differential signal processor, including signal conversion and solution
Processing unit, signal acquisition process unit, signal processing and coding algorithm unit and the utility model any embodiment is adjusted to provide
Differential signal filter circuit；
The differential signal filter circuit and the signal are converted be electrically connected with demodulation process unit, the signal convert and
Demodulation process unit is electrically connected with the signal acquisition process unit, the signal acquisition process unit and the signal processing with
Coding algorithm unit electrical connection.
The technical solution of the utility model, differential signal filter circuit include differential signal outputs mouths, analog references
Port, common mode inductance and at least two stage filter sub-circuit.Differential signal outputs mouth is electrically connected with common mode inductance, analog references
Port is electrically connected at least two stage filter sub-circuit.The differential signal that differential signal outputs mouth is exported by common mode inductance into
Row filtering, while the reference potential signal of at least two stage filter sub-circuit to analog references port output is filtered, it can be with
The electromagnetic immunity for improving differential signal outputs mouth makes differential signal outputs mouth meet the electromagnetic immunity test of national military standard
It is required that.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of differential signal filter circuit provided by the embodiment of the utility model；
Fig. 2 is the structural schematic diagram of another differential signal filter circuit provided by the embodiment of the utility model；
Fig. 3 is the structural schematic diagram of another differential signal filter circuit provided by the embodiment of the utility model；
Fig. 4 is a kind of structural schematic diagram of differential signal processor provided by the embodiment of the utility model.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
Fig. 1 is a kind of structural schematic diagram of differential signal filter circuit provided by the embodiment of the utility model.Such as Fig. 1 institute
Show, which includes differential signal outputs mouth 110, analog references ground port 120,130 and of common mode inductance
At least two stage filter sub-circuit 140.
Differential signal outputs mouth 110 is electrically connected with common mode inductance 130, analog references port 120 filtered at least two-stage
Marble circuit 140 is electrically connected.
Specifically, differential signal outputs mouth 110 be differential signal filter circuit input port, for input need into
The signal of row filtering.Common mode inductance 130 is electrically connected with differential signal outputs mouth 110, for differential signal outputs mouth 110
The differential signal of offer is filtered.For example, when differential signal filter circuit is used to be filtered for XGA video differential signal
When, XGA video differential signal is provided by digital analog converter, therefore differential signal outputs mouth 110 can be digital analog converter
Output port, and as XGA video differential signal input terminal, for inputting XGA video differential signal.When XGA video difference is believed
Number by differential signal outputs mouth 110 be transmitted to common mode inductance 130 when, common mode inductance filters XGA video differential signal
Wave improves the signal-to-noise ratio of XGA video differential signal.
The material of 130 magnetic core of common mode inductance can be nickel core material, it is preferable that can be the mixing material of nickel.Pass through choosing
The material for taking 130 magnetic core of common mode inductance can be further improved the filter action of common mode inductance 130.
Analog signal includes small and weak signal, and the reference potential of the analog signal on different routes may be implemented to analog references
For equipotential.I.e. analog references port output signal for the signal that differential signal outputs mouth exports analog references are provided
Signal.Under normal circumstances, can be arranged to analog references by increasing analog references ground wire in the transmission path of analog signal.
For example, XGA video differential signal can wrap when differential signal filter circuit is used to be filtered for XGA video differential signal
Three differential signal lines are included, independent analog references ground wire is set between XGA video differential signal and the signal processing circuit of XGA
Realize the equipotential link between the reference ground on different XGA video differential signal lines.Analog references port 120 at least
Two stage filter sub-circuit 140 is electrically connected, and can be carried out by signal of at least two stage filter sub-circuit 140 to analog references ground
Filtering, avoids interference signal from interfering fluctuation to the current potential on analog references ground, to ensure that the current potential on analog references ground not
Become, and then ensure that the reference potential of the analog signal of different differential signal line roads is equipotential, improves XGA video difference
The signal-to-noise ratio of signal.
In above process, common mode inductance 130 and at least two stage filter sub-circuit 140 improves the noise of differential signal simultaneously
Than, and then the electromagnetic immunity of differential signal outputs mouth 110 can be improved, so that differential signal outputs mouth 110 is met army, state
The test request of target electromagnetic immunity.For example, when differential signal filter circuit be applied to XGA video differential signal output end with
When between XGA analog signal converting unit, the electromagnetic immunity of XGA video differential signal output end can be improved, make XGA video
Differential signal outputs meet the test request of the electromagnetic immunity of national military standard.
The technical solution of the present embodiment, differential signal filter circuit include differential signal outputs mouth, analog references ground terminal
Mouthful, common mode inductance and at least two stage filter sub-circuit.Differential signal outputs mouth is electrically connected with common mode inductance, analog references ground terminal
Mouth is electrically connected at least two stage filter sub-circuit.The differential signal that differential signal outputs mouth exports is carried out by common mode inductance
Filtering, while at least two stage filter sub-circuit reference potential signal that analog references port exports is filtered, Ke Yiti
The electromagnetic immunity of high differential signal output port, makes differential signal outputs mouth meet the test of the electromagnetic immunity of national military standard
It is required that.
Based on the above technical solution, Fig. 2 is another differential signal filtering provided by the embodiment of the utility model
The structural schematic diagram of circuit.As shown in Fig. 2, at least two stage filter sub-circuit 140 includes that the first order filters sub-circuit 141 and second
Grade filtering sub-circuit 142, it is L-type filter circuit that the first order, which filters sub-circuit 141 and second level filtering sub-circuit 142,.
Specifically, as shown in Fig. 2, at least two stage filter sub-circuit 140 may include two stage filter sub-circuit, respectively
First-level filtering marble circuit 141 and the second level filter sub-circuit 142.The first order filters sub-circuit 141 and the second level filters sub-circuit
142 be L-type filter circuit, therefore first order filtering sub-circuit 141 and the second level filter suppression of the sub-circuit 142 at resonance point
Power processed is weaker, and filter effect is poor.Sub-circuit 141 is filtered by the setting first order and the second level filters the resonance of sub-circuit 142
Point is different, and first order filtering sub-circuit 141 can be made to increase the filtering of second level filtering 142 resonance point respective frequencies of sub-circuit
Effect, the second level filter the filter action that sub-circuit 142 increases first order filtering 141 resonance point respective frequencies of sub-circuit.First
The filtering sub-circuit that grade filtering sub-circuit 141 and second level filtering sub-circuit 142 form can be avoided filtering sub-circuit in resonance
The weak problem of point restraint, ensure that the filter effect of at least two stage filter sub-circuit 140.
Illustratively, first order filtering sub-circuit 141 includes the first inductive element L1 and first capacitor C1, second level filtering
Sub-circuit 142 includes the second inductive element L2 and the second capacitor C2.The first end and analog references ground terminal of first inductive element L1
Mouthfuls 120 are electrically connected, and the of the second end of the first inductive element L1 and the first end of first capacitor C1 and the second inductive element L2
One end electrical connection, with casing PE is electrically connected the second end of first capacitor C1, the second end of the second inductive element L2 and the second electricity
Hold the first end electrical connection of C2, the second end of the second capacitor C2 is electrically connected with digitally GND.The first order filters 141 He of sub-circuit
The second level filters sub-circuit 142 and is electrically connected, and can carry out secondary filtering to the signal on analog references ground, improve differential signal output
The electromagnetic immunity of port.
When differential signal filter circuit is used for the technical field of Airborne Video System, differential signal filter circuit is used to regard XGA
When frequency difference sub-signal is filtered, the band limits of interference signal is 2M-400M at this time.The filtering frequency range of high frequency magnetic bead is 50M-
60M, the filtering frequency range of inductance are 10M-20M, and the filtering frequency range of high frequency magnetic bead is high compared to the filtering frequency range of inductance.Therefore,
One inductive element L1 and the second inductive element L2 can be high frequency magnetic bead, and first order filtering son electricity can be improved by high frequency magnetic bead
The filtering frequency range on road 141 and second level filtering sub-circuit 142.
It should be noted that the close corresponding port of filtering device as far as possible, can reduce filtering device and port
Between cabling on inductance, avoid the inductive impact filter effect on cabling.
In addition, when differential signal filter circuit be used for Airborne Video System technical field, differential signal filter circuit for pair
When XGA video differential signal is filtered, the frequency range of XGA video differential signal is in tens ranges.Pass through the first electricity of setting
The difference for holding the capacitance of C1 and the capacitance of the second capacitor C2 can make first order filtering sub-circuit 141 and second level filter
The difference of the resonance point of marble circuit 142 is tens, so as to avoid filtering sub-circuit in the frequency of XGA video differential signal
There is a problem of that resonance point restraint is weak in segment limit, ensure that the filter effect of at least two stage filter sub-circuit 140.It is preferred that
The difference of the capacitance of ground, the capacitance of first capacitor C1 and the second capacitor C2 is 100 times.
It should be noted that differential signal filter circuit includes casing ground PE, digitally GND and analog references.It is making
When making differential signal filter circuit, the wiring of PCB needs to avoid different types of according to wiring is split different types ofly
Ground influences each other.In addition, the width of more via hole connections or cabling connected to it can be set in first capacitor C1 and the second capacitor C2
It spends bigger, can reduce distributed inductance.
On the basis of above-mentioned each technical solution, with continued reference to Fig. 2, differential signal filter circuit further includes first resistor
R1.The first end of first resistor R1 is electrically connected with the second end of the second inductive element L2, and the second end of first resistor R1 is difference
The ground terminal output port of signal filter circuit.
Specifically, as shown in Fig. 2, first resistor R1 is electrically connected at least two stage filter sub-circuit 140, pass through setting first
Resistance R1, analog references can be limited the electric current on port 120.The resistance value of first resistor R1 is less than or equal to 500 ohm, keeps away
Exempt from signal of the first resistor R1 on analog references on port 120 amplitude influence it is excessive.
It should be noted that the resistance value of first resistor R1 is only a kind of example herein, rather than limit.First resistor R1's
Resistance value need to only meet the requirement of circuit application.
On the basis of above-mentioned each technical solution, Fig. 3 is another differential signal filter provided by the embodiment of the utility model
The structural schematic diagram of wave circuit.As shown in figure 3, differential signal outputs mouth 110 include the first differential signal outputs mouth 111,
Second differential signal outputs mouth 112 and third differential signal outputs mouth 113.Common mode inductance 130 includes the first common mode inductance
131, the second common mode inductance 132 and third common mode inductance 133.The positive output end 111A of first differential signal outputs mouth 111 with
The first input end in11 of first common mode inductance 131 is electrically connected, the negative output terminal 111B of the first differential signal outputs mouth 111 with
Second input terminal in12 of the first common mode inductance 131 is electrically connected.The positive output end 112A of second differential signal outputs mouth 112 with
The first input end in21 of second common mode inductance 132 is electrically connected, the negative output terminal 112B of the second differential signal outputs mouth 112 with
Second input terminal in22 of the second common mode inductance 132 is electrically connected.The positive output end 113A of third differential signal outputs mouth 113 with
The first input end in31 of third common mode inductance 133 is electrically connected, the negative output terminal 113B of third differential signal outputs mouth 113 with
Second input terminal in32 of third common mode inductance 133 is electrically connected.
Specifically, as shown in figure 3, each differential signal outputs mouth 110 is electrically connected with a common mode inductance 130, common mode
The signal that inductance 130 exports its corresponding differential signal outputs mouth 110 carries out common mode filtering, so that it is defeated to improve differential signal
The signal-to-noise ratio of 110 output signal of exit port improves the electromagnetic immunity of differential signal outputs mouth 110, exports differential signal
Port 110 meets the test request of the electromagnetic immunity of national military standard.Under normal circumstances, the DCR value of common mode inductance 130 is less than or waits
It in 0.5 ohm, avoids the equivalent impedance of common mode inductance too big, influences the amplitude of 110 output signal of differential signal outputs mouth.
Illustratively, when differential signal filter circuit is used to be filtered XGA video differential signal, the first differential signal outputs
The 111, second differential signal outputs mouth 112 of mouth and third differential signal outputs mouth 113 are respectively R, G and B differential signal end
Mouthful, R differential signal, G differential signal and B differential signal are exported respectively.
It should be noted that the first differential signal outputs mouth 111, the second differential signal outputs mouth 112 and third are poor
Sub-signal output port 113 can be routed with difference form, and the balanced, symmetrical as far as possible in wiring, to reduce DM EMI signal
Loop.The cabling between differential signal outputs mouth 110 and common mode inductance 130 is unsuitable too long simultaneously, avoids the inductance of cabling
Influence filter effect.
The utility model embodiment also provides a kind of differential signal processor.Fig. 4 is provided by the embodiment of the utility model
A kind of structural schematic diagram of differential signal processor.As shown in figure 4, the differential signal processor includes that signal conversion is mediated with solution
Reason unit 10, signal acquisition process unit 20, signal processing and coding algorithm unit 30 and the utility model any embodiment mention
The differential signal filter circuit 40 of confession.Differential signal filter circuit 40 is converted with signal and is electrically connected with demodulation process unit 10, is believed
Number conversion is electrically connected with demodulation process unit 10 with signal acquisition process unit 20, signal acquisition process unit 20 and signal processing
It is electrically connected with coding algorithm unit 30.
Specifically, as shown in figure 4, sub-signal processor of being on duty is for Airborne Video System technical field, for XGA video difference
When sub-signal is handled, the differential signal outputs mouth 110 of differential signal filter circuit 40 can be the defeated of digital analog converter
Outlet.Differential signal filter circuit 40 is filtered XGA video differential signal.It is filtered through differential signal filter circuit 40
Signal afterwards is transmitted to signal conversion and demodulation process unit 10, and signal conversion carries out differential signal with demodulation process unit 10
Conversion and demodulation, are converted to single-ended analog signal for differential signal, and demodulate trip, field synchronization information.Signal conversion and demodulation
The single-ended analog signal that processing unit 10 exports is transmitted to signal acquisition process unit 20, and signal acquisition process unit 20 acquires list
Analog signal is held, A/D conversion is carried out to single-ended analog signal, forms digital signal, and be transmitted to signal processing and encryption algorithm
Unit 30.Signal processing is handled digital signal with coding algorithm unit 30, and is encoded, the number letter after making coding
It number can show on a display screen.
The technical solution of the present embodiment, by being inserted into differential signal filtered electrical in the signal circuit of differential signal processor
Road, the differential signal that differential signal filter circuit exports differential signal outputs mouth are filtered, and differential signal can be improved
The electromagnetic immunity of output port makes differential signal outputs mouth meet the test request of the electromagnetic immunity of national military standard.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (10)
1. a kind of differential signal filter circuit, which is characterized in that including differential signal outputs mouth, analog references port, altogether
Mould inductance and at least two stage filter sub-circuit；
The differential signal outputs mouth is electrically connected with the common mode inductance, the analog references ground port and at least two-stage
Filter sub-circuit electrical connection.
2. differential signal filter circuit according to claim 1, which is characterized in that at least two stage filter sub-circuit packet
Include first order filtering sub-circuit and second level filtering sub-circuit, the first order filtering sub-circuit and second level filtering son electricity
Road is L-type filter circuit.
3. differential signal filter circuit according to claim 2, which is characterized in that the first order filters sub-circuit and includes
First inductive element and first capacitor, the second level filtering sub-circuit includes the second inductive element and the second capacitor；
With the analog references port is electrically connected the first end of first inductive element, and the second of first inductive element
End is electrically connected with the first end of the first end of the first capacitor and second inductive element, and the second of the first capacitor
End with casing is electrically connected, and the second end of second inductive element is electrically connected with the first end of second capacitor, and described the
The second end of two capacitors be digitally electrically connected.
4. differential signal filter circuit according to claim 3, which is characterized in that first inductive element and described
Two inductive elements are high frequency magnetic bead.
5. differential signal filter circuit according to claim 3, which is characterized in that the capacitance of the first capacitor and institute
The difference for stating the capacitance of the second capacitor is 100 times.
6. differential signal filter circuit according to claim 3, which is characterized in that further include first resistor；Described first
The first end of resistance is electrically connected with the second end of second inductive element, and the second end of the first resistor is difference letter
The ground terminal output port of number filter circuit.
7. differential signal filter circuit according to claim 6, which is characterized in that the resistance value of the first resistor be less than or
Equal to 500 ohm.
8. differential signal filter circuit according to claim 1, which is characterized in that the differential signal outputs mouth includes
First differential signal outputs mouth, the second differential signal outputs mouth and third differential signal outputs mouth；The common mode inductance
Including the first common mode inductance, the second common mode inductance and third common mode inductance；
The positive output end of the first differential signal outputs mouth is electrically connected with the first input end of first common mode inductance, institute
The negative output terminal for stating the first differential signal outputs mouth is electrically connected with the second input terminal of first common mode inductance；
The positive output end of the second differential signal outputs mouth is electrically connected with the first input end of second common mode inductance, institute
The negative output terminal for stating the second differential signal outputs mouth is electrically connected with the second input terminal of second common mode inductance；
The positive output end of the third differential signal outputs mouth is electrically connected with the first input end of the third common mode inductance, institute
The negative output terminal for stating third differential signal outputs mouth is electrically connected with the second input terminal of the third common mode inductance.
9. differential signal filter circuit according to claim 1, which is characterized in that the DCR value of the common mode inductance is less than
Or it is equal to 0.5 ohm.
10. a kind of differential signal processor, which is characterized in that including signal conversion and demodulation process unit, signal acquisition process
Unit, signal processing and coding algorithm unit and any differential signal filter circuit of claim 1-9；
The differential signal filter circuit is converted with the signal and is electrically connected with demodulation process unit, the signal conversion and demodulation
Processing unit is electrically connected with the signal acquisition process unit, the signal acquisition process unit and the signal processing and coding
Algorithm unit electrical connection.
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| CN201920557418.0U CN209517353U (en) | 2019-04-19 | 2019-04-19 | A kind of differential signal filter circuit and differential signal processor |
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| CN201920557418.0U CN209517353U (en) | 2019-04-19 | 2019-04-19 | A kind of differential signal filter circuit and differential signal processor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113905146A (en) * | 2021-10-21 | 2022-01-07 | 深圳市锐思华创技术有限公司 | Image transmission module of optical display hardware control platform |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113905146A (en) * | 2021-10-21 | 2022-01-07 | 深圳市锐思华创技术有限公司 | Image transmission module of optical display hardware control platform |
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