CN102868863A - Analog video signal transmitting device - Google Patents
Analog video signal transmitting device Download PDFInfo
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- CN102868863A CN102868863A CN201110188788XA CN201110188788A CN102868863A CN 102868863 A CN102868863 A CN 102868863A CN 201110188788X A CN201110188788X A CN 201110188788XA CN 201110188788 A CN201110188788 A CN 201110188788A CN 102868863 A CN102868863 A CN 102868863A
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- analog video
- signal
- interface circuit
- output
- transmitting device
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Abstract
The invention relates to an analog video signal transmitting device. One end of an output interface circuit of an output unit is connected with an earthing circuit, and the other end of the output interface circuit outputs an analog video voltage signal to a current converter, the analog video voltage signal is converted into an equal-proportion analog video current signal as an output signal; a receiving unit receives the output analog video current signal through a receiving interface circuit to form a received analog video voltage signal; and the earthing circuit is connected with a line in front of the receiving interface circuit by an impedance, and is then connected to the receiving interface circuit through a node so as to eliminate noises.
Description
Technical field
Along with the fast development of communication and audio-visual multimedia, more and more higher to the requirement of video Image character, and disturb via reducing noise decrease, for improving the important means of video quality.
Fig. 1 is the circuit diagram of prior art analog video signal transmission.The output interface circuit 11 1 end ground connection of the output unit 10 of prior art, the other end are exported an analog video voltage signal Vo=A (t) to receiving element 12.After receiving element 12 received analog video voltage signal Va=A (t), its receiving interface circuit 13 can produce corresponding reception analog video voltage signal Vi=A (t).But when earthed circuit G produces ground noise voltage N (t), then can import receiving element 12 into and cause the noise that receives analog voltage signal, and affect the quality of transmission voltage signal.Therefore prior art adds an impedance Z in receiving element 12, in order to reduce earthed circuit G to the interference of receiving element 12.
Yet, when the earthed circuit G of prior art produces noise voltage N (t), noise voltage N (t) still can be via the receiving interface circuit 13 of ground connection, disturb receiving interface circuit 13, make the reception analog video voltage signal Vi=A (t) of receiving interface circuit 13-N (t), and be subject to the impact of ground noise voltage N (t), thereby can't improve the transmission quality of analog signal.Therefore prior art analog signal transmission device still has problem to need to be resolved hurrily eliminating on the noise.
Summary of the invention
Purpose of the present invention by a current converter, converts the analog video voltage signal that transmits to current signal in that a kind of analog video signal transmitting device is provided, and eliminates ground noise, with the transmission quality of Lifting Modules analog signal.
Another purpose of the present invention is providing a kind of analog video signal transmitting device, keeps under the low manufacturing cost not increasing wire rod, utilizes ball bearing made using to promote the transmission quality of signal.
In order to reach the purpose of aforementioned invention, analog video signal transmitting device of the present invention, output interface circuit by output unit, one end is connected to earthed circuit, other end output analog video voltage signal converts the analog video voltage signal to equal proportion analog video current signal as output signal to current converter.Utilize the receiving interface circuit to receive the analog video current signal of output unit output by receiving element again, form and receive the analog video voltage signal.Earthed circuit is connected to signal transmission line before this receiving interface circuit by node via impedance, and is connected to the receiving interface circuit by the node bifurcated.
Description of drawings
Fig. 1 is the circuit diagram of prior art analog video signal transmission.
Fig. 2 is the circuit diagram of analog video signal transmitting device of the present invention.
[main element symbol description]
20 analog video signal transmitting devices
21 output units
22 receiving elements
23 output interface circuits
24 earthed circuits
25 current converters
26 receiving interface circuit
Embodiment
Relevant the present invention is for reaching above-mentioned purpose, and the technological means that adopts and effect thereof are lifted preferred embodiment hereby, and cooperates accompanying drawing to be illustrated as follows.
Please refer to Fig. 2, be the circuit diagram of analog video signal transmitting device of the present invention.Analog signal transmission device 20 of the present invention comprises output unit 21 and receiving element 22.Wherein, output unit 21 is the equipment of exportable analog video signal, such as video equipments such as CD player.Output interface circuit 23 in the output unit 21, one end is connected to earthed circuit 24, the other end is exported an analog video voltage signal Vo=A (t) to a current converter 25, and recycling current converter 25 converts analog video voltage signal Vo the analog video current signal Io of equal proportion to as output signal.Receiving element 22 is for receiving the equipment of analog video signal, display devices such as display, TV.Utilize a receiving interface circuit 26 to receive the analog video current signal Io of output unit 21 outputs in the receiving element 22, receive analog video voltage signal Vi and form.The node a of signal transmission line before receiving interface circuit 26, be connected to the node b of earthed circuit 24 via an impedance Z (generally being about 75hm), earthed circuit 24 is connected to receiving interface circuit 26 by node b bifurcated again, make receiving interface circuit 26 ground connection, to consist of the circuit of analog video signal transmitting device of the present invention.
Analog video voltage signal Vo=A (t) by output interface circuit 23 output of output unit 21, conversion via current converter 25, be convertible into the analog video current signal Io=k*A (t) of equal proportion, wherein k is proportionality constant, in the signal transmission line transmission of 22 of output unit 21 and receiving elements.Because signal transmission line and earthed circuit 24 are balance at the voltage of node a, if earthed circuit 24 produces noise, the noise voltage N (t) that produces of node b then, adding the voltage of impedance Z, therefore can learn that the voltage at node a is Io*Z+N (t), also be the voltage that receiving interface circuit 26 receives, but be subjected in addition noise voltage N (t) impact of earthed circuit 24 because of receiving interface circuit 26, so that receiving interface circuit 26 last received analog video voltage signal Vi=[Io*Z+N (t)]-N (t)=Io*Z, be the voltage difference of node a and node b.Therefore adding a current converter 24 as can be known, with originally the transmission the analog video voltage signal convert the analog video current signal of equal proportion to after, the analog video voltage signal that receiving element 22 receives is just irrelevant with the noise voltage of earthed circuit 24, and can avoid earthed circuit 24 on the impact of analog video voltage signal transmission.
Therefore, by aforementioned analog video signal transmitting device of the present invention, can add by the circuit in the prior art analog signal transmission current converter, keep under the low manufacturing cost not increasing wire rod, utilize ball bearing made using the analog video voltage signal of the original output of output device to be converted to the analog video current signal of equal proportion, get rid of earthed circuit to the impact of analog video voltage signal transmission as signal transmission, eliminate ground noise, reach the purpose of Lifting Modules analog signal transmission quality of the present invention.
Only in order to convenient explanation the preferred embodiments of the present invention, scope of the present invention is not limited to these preferred embodiments for the above, and all any changes of doing according to the present invention without departing from the spirit of the present invention, all belong to the claimed scope of claims of the present invention.
Claims (5)
1. analog video signal transmitting device, it comprises:
One output unit, has output interface circuit, one end of this output interface circuit is connected to an earthed circuit, and the other end is exported analog video voltage signal to a current converter, converts the analog video voltage signal to the analog video current signal as output signal; And
One receiving element, utilize a receiving interface circuit to receive the analog video current signal of this output unit output, form and receive the analog video voltage signal, and this earthed circuit is connected to signal transmission line before this receiving interface circuit by a node via an impedance, and is connected to the receiving interface circuit by this node bifurcated.
2. analog video signal transmitting device as claimed in claim 1, wherein this output unit is the video equipment of outputting analog signal.
3. analog video signal transmitting device as claimed in claim 1, wherein this receiving element is for receiving the display device of analog signal.
4. analog video signal transmitting device as claimed in claim 1, wherein this current converter converts the analog video voltage signal to equal proportion analog video current signal.
5. analog video signal transmitting device as claimed in claim 1, wherein the analog video voltage signal that receives of this receiving interface circuit be the front signal transmission line of this receiving interface circuit and the voltage difference of this node.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110188788XA CN102868863A (en) | 2011-07-06 | 2011-07-06 | Analog video signal transmitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110188788XA CN102868863A (en) | 2011-07-06 | 2011-07-06 | Analog video signal transmitting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102868863A true CN102868863A (en) | 2013-01-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110188788XA Pending CN102868863A (en) | 2011-07-06 | 2011-07-06 | Analog video signal transmitting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102868863A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1972273A (en) * | 2005-11-21 | 2007-05-30 | 研华股份有限公司 | A transmission method for high-interference environment and its transmission system |
| US20080246642A1 (en) * | 2007-04-09 | 2008-10-09 | Realtek Semiconductor Corp. | Digital-to-analog signal converter, and digital-to-analog signal converting method |
| WO2010061511A1 (en) * | 2008-11-28 | 2010-06-03 | 三菱電機株式会社 | Signal transmission device |
| US20110128089A1 (en) * | 2008-11-28 | 2011-06-02 | Kohei Teramoto | Signal transmission device |
-
2011
- 2011-07-06 CN CN201110188788XA patent/CN102868863A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1972273A (en) * | 2005-11-21 | 2007-05-30 | 研华股份有限公司 | A transmission method for high-interference environment and its transmission system |
| US20080246642A1 (en) * | 2007-04-09 | 2008-10-09 | Realtek Semiconductor Corp. | Digital-to-analog signal converter, and digital-to-analog signal converting method |
| WO2010061511A1 (en) * | 2008-11-28 | 2010-06-03 | 三菱電機株式会社 | Signal transmission device |
| US20110128089A1 (en) * | 2008-11-28 | 2011-06-02 | Kohei Teramoto | Signal transmission device |
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Application publication date: 20130109 |