CN106657858A - Control method and control device for signal transmission distance - Google Patents
Control method and control device for signal transmission distance Download PDFInfo
- Publication number
- CN106657858A CN106657858A CN201610844343.5A CN201610844343A CN106657858A CN 106657858 A CN106657858 A CN 106657858A CN 201610844343 A CN201610844343 A CN 201610844343A CN 106657858 A CN106657858 A CN 106657858A
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- 230000008054 signal transmission Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 59
- 230000002708 enhancing effect Effects 0.000 claims description 22
- 238000003780 insertion Methods 0.000 claims description 9
- 230000037431 insertion Effects 0.000 claims description 9
- 238000002789 length control Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 230000000977 initiatory effect Effects 0.000 abstract description 3
- 230000002787 reinforcement Effects 0.000 abstract 10
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 108700020469 14-3-3 Proteins 0.000 description 1
- 102000004899 14-3-3 Proteins Human genes 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/015—High-definition television systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
- H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Picture Signal Circuits (AREA)
Abstract
The invention provides a control method for a signal transmission distance. Signal pre-reinforcement is performed on a signal initiating end. In pre-reinforcement, a pre-reinforcement pulse signal is generated through a serial data signal which is received from an external source by a pulse signal generating unit, and a signal reinforcement unit responds to the pre-reinforcement pulse signal and performs signal reinforcement. Length of a transmission wire is determined by means of time delay of a control signal which is fed back from a signal receiving end, Furthermore a pre-reinforcement degree of the signal initiating end is controlled according to the length. A cable of a coaxial vision control signal which is transmitted from a receiving end to a transmitting end is utilized for transmitting time delay information. Condition of the cable can be accurately determined, and then targeted reinforcement is performed. Therefore, incapability of reaching a desired signal quality effect caused by overlow transmitting-end signal pre-reinforcement degree or error information transmission to the receiving end and a negative effect caused by overhigh transmitting-end signal pre-reinforcement can be prevented. Furthermore, a coaxial vision control signal which is utilized as the control signal is one necessary function for simulating high definition currently, and therefore the operation does not cause an additional cost to the solution of an image camera.
Description
Technical field
The present invention relates to high-definition signal transmission field, more particularly to a kind of control method and device of signal transmission distance.
Background technology
In security protection video monitoring field, analog video systems experienced CVBS, 960H and present HD-CCTV simulation high definitions
Three phases standard, 960H is that CVBS simply prolongs life, is only the increase of horizontal resolution, and HD-CCTV standards are once brand-new
Breakthrough, be mainly manifested in：
Analog bandwidth increases, and image resolution ratio can reach 1080P even more highs；
Using transmission mode line by line；
The luminance and chrominance information of image is separated, without bright color crosstalk；
Control signal and audio cinch are transmitted；
Coaxial signal transmission range is significantly increased.
For simulation system, signal is always in applying most by the transmission range of coaxial cable (75-5/75-3)
One of important problem.Due to decay of the signal in coaxial cable, through remote (after particularly 500 meters), in cable
Signal will produce very strong decay, cause receiving terminal image to recover difficult, such as color is lost, and image noise increases, definition
Decline, and other image disruptions etc., or even missing image can be caused.
In order to improve the transmission performance of analog video signal, it is necessary to the preemphasis started transmission signal and receiving end
Equilibrium treatment.For this purpose, HD-CVI, HD-TVI and AHD have done performance boost in terms of the equilibrium of receiving terminal, to improve transmission
Signaling protein14-3-3 quality.
The Transmission system of existing simulation high definition, recovers to the signal of general long range, and using receiving terminal signal equalization is carried out
Method, recover demand to solve the receiving terminal signal that cannot meet of equilibrium.If transmission range is long, such as several kilometers,
Transmitting-receiving two-end can be also adopted to use the method for optical transmitter and receiver in engineer applied.
The content of the invention
To solve the problems, such as prior art, the present invention provides a kind of control method of signal transmission distance, to initiating
End carry out signal preemphasis, using signal receiving end feed back control signal relative to its insertion position delay judgement transmission line
Length, and the preemphasis degree of the signal originating end is controlled according to the length；
Wherein, the preemphasis generates pre-add by pulse signal generating unit from the serial data signal that external source is received
Weight pulse signal, signal enhancing unit carries out signal enhancing in response to the pre-emphasis pulse signal.
Optionally, the control signal regards control signal for coaxial, and the insertion position is to receive certain in vision signal
Fixed position after horizontal blanking signal.
Optionally, the attenuation degree always according to the control signal waveform of receiving terminal feedback judges the length of transmission line.
Optionally, the computing formula of length S of the transmission line is as follows：
Wherein, V is transmission speed of the signal in transmission line, and unit is m/us (about 217m/us)；Delay is signal
Transmission delay, unit is us.
Optionally, preemphasis is carried out to the HFS of signal originating end using high-pass filter.
Optionally, when judging the length of transmission line for 0m-300m, the preemphasis of originating end is not carried out；Judge transmission line
When length is 300m-400m, the first degree preemphasis is carried out to originating end；It is right when judging the length of transmission line for more than 500m
Originating end carries out the second degree preemphasis；Second degree is more than first degree.
Optionally, the filter parameter of the first degree preemphasis be Fstop=0, Fpass=35, Wstop=0.2,
Wpass=40；The filter parameter of the second degree preemphasis is Fstop=0, Fpass=35, Wstop=0.2, Wpass
=120.
The present invention also provides a kind of control device of signal transmission distance, including：
Wave filter, to signal originating end signal preemphasis is carried out；
Pulse signal generating unit, the serial data signal for receiving from external source generates pre-emphasis pulse signal；
Signal enhancing unit, in response to the pre-emphasis pulse signal, and carries out signal enhancing by the wave filter；With
And
Delay acquisition module, for obtain signal receiving end feedback control signal relative to its insertion position time delay with
Judge the length of transmission line, and the preemphasis degree of the signal originating end of the wave filter is controlled according to the length.
Optionally, the control device of described signal transmission distance also includes A/D module, for the control fed back to receiving terminal
Signal processed carries out waveform analysis, and judges the length of transmission line according to the attenuation degree of waveform.
The present invention provides a kind of control method of signal transmission distance, and signal preemphasis is carried out to signal originating end, described
Preemphasis generates pre-emphasis pulse signal by pulse signal generating unit from the serial data signal that external source is received, and signal increases
Strong unit carries out signal enhancing in response to the pre-emphasis pulse signal.Wherein, the control signal fed back using signal receiving end
Delay judgement transmission line length, and the preemphasis degree of the signal originating end is controlled according to the length.Using receiving end
To the coaxial cable transmission delayed data regarded in control signal of originator transmission, accurately judgement can be made to the situation of cable,
Then targetedly strengthened.Can so avoid originating terminal signal preemphasis degree from kicking the beam, not reach signal quality due
Effect, or originating terminal signal preemphasis is overweight, gives receiving terminal transmission error message, produces negative effect.In addition, control signal is adopted
Coaxial is to simulate one of necessary function of high definition now depending on controlling signal, so this part operation can't be to the side of video camera
Case produces extra cost.
Description of the drawings
Fig. 1 is the flow chart of the control method of the signal transmission distance described in one embodiment of the invention.
Specific embodiment
The present invention provides a kind of control method of signal transmission distance, and to signal originating end signal preemphasis is carried out.Wherein,
The control signal fed back using signal receiving end relative to the delay judgement transmission line of its insertion position length, and according to described
Length controls the preemphasis degree of the signal originating end；Wherein, the preemphasis passes through pulse signal generating unit from outside
The serial data signal that source receives generates pre-emphasis pulse signal, and signal enhancing unit enters in response to the pre-emphasis pulse signal
Row signal enhancing.
In the present embodiment, the control signal regards control signal for coaxial, for receiving terminal is coaxially regarded to what transmitting terminal was transmitted
Control signal, its insertion position is to receive the fixed position after certain the horizontal blanking synchronizing signal in vision signal.This is coaxially regarded
Control signal is detected after the transmission delay of cable in originator.But the coaxial control signal that regards now is relative to the slotting of receiving end
Entering position will produce one section of time delay, and transmission delay of this section of time delay to signal in cable is directly proportional.So according to this section of time delay,
The length of cable can just be determined.
Using receiving end to the cable transmission delayed data in the coaxial signal regarding control of originator transmission, can be to the situation of cable
Accurately judgement is made, is then targetedly strengthened.Can so avoid originating terminal signal preemphasis degree from kicking the beam, make signal matter
Measure and do not reach due effect, or originating terminal signal preemphasis is overweight, transmits error message to receiving terminal, produces negative effect.
Based on the transmission cable length of above-mentioned estimation, the loss situation of signal transmission can be significantly estimated.It is preferred that
, in addition combined with to receiving the coaxial waveform analysis for regarding control signal, moreover it is possible to the further accuracy for improving estimation.Waveform point
Amplitude of the main observable waveform after decay is analysed, this work can be completed by an A/D module.By this kind according to waveform
Judge that the method for length of transmission line in combination with the aforesaid method according to signal delay, can further improve the length of transmission line
The accuracy of degree estimation.
Further, since coaxial is to simulate one of necessary function of high definition now depending on controlling signal, so this part operation is not
Extra cost can be produced to the scheme of video camera.
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.Will according to following explanation and right
Book, advantages and features of the invention is asked to become apparent from.It should be noted that, accompanying drawing is in the form of simplifying very much and using non-
Accurately ratio, only aids in illustrating the purpose of the embodiment of the present invention to convenience, lucidly.
By taking HDTVI simulation high definition standards as an example, if using the coaxial cable of 75-3-1, transmitting the image of 1080P25 frames
Signal, its substantially undistorted cable distance at 300 meters or so, if using 500 rice noodles cables, it will picture noise occur acute
Increase, the interference of colored twill, a series of problems, such as color saturation declines.
Using the control method of the signal transmission distance of the present invention, coaxial the regarding that can be transmitted using receiving terminal first controls letter
Number, judge the length of cable.For example, for 2m short-terms, transmitting terminal delay acquisition module detects coaxial regarding and controls signal distance
The time delay at synchronizing signal edge be 2.6us, for 150m cables and 500m cables, this time delay for detecting be respectively 4us and
7.2us.The length of the coaxial time delay and transmission cable for regarding control signal distance synchronizing signal edge is can be seen that from these three data
It is directly proportional, detects that this time delay can accurately just calculate the length of transmission cable.It is described for general coaxial cable
The computing formula of length S of transmission line is as follows：
Wherein, S for cable length, unit m, V is transmission speed of the signal in transmission line, unit be m/us (about
217m/us)；Delay is the transmission delay of signal, and unit is us.
In actual test, following self adaptation grade interval can be divided into.
1. when judging the length of transmission line for 0m-300m, without the need for carrying out originating terminal signal enhancing.
2. when judging the length of transmission line for 300m-400m, the first degree preemphasis is carried out to originating end；First degree is pre-
Increase as light enhancing degree, now the preferred reference parameter of wave filter can be Fstop=0；Fpass=35；Wstop=0.2；
Wpass=40；
3. when judging the length of transmission line for more than 500m, the second degree preemphasis is carried out to originating end；Second degree is pre-
Increase enhancing degree of attaching most importance to, now filter reference parameter can be Fstop=0；Fpass=35；Wstop=0.2；Wpass
=120.
To the transmission cable in 300m, sending signal need not carry out any enhancing, and being only abutted against receiving end equilibrium just can be accurate
Recovery transmission signal, and for 500m transmission cables, originator has been used after a specific signal enhancing wave filter, receiving terminal
Video image noise have and obviously reduce, colored twill interference disappears, and color saturation is significantly recovered,
The visual effect of image is lifted obvious.According to above-mentioned estimation result, adaptive different grades of signal enhancing can be carried out.
Based on the length of transmission line of estimation, the loss situation of signal transmission just can be significantly estimated, with reference to docking
The coaxial waveform analysis for regarding control signal is received, the accuracy of estimation can be further improved.The main observable waveform of analysis of waveform
Amplitude after decay, this work can be completed by a simple A/D module.
The present invention also provides a kind of control device of signal transmission distance, it is characterised in that include：
Wave filter, to signal originating end signal preemphasis is carried out；
Pulse signal generating unit, the serial data signal for receiving from external source generates pre-emphasis pulse signal；
Signal enhancing unit, in response to the pre-emphasis pulse signal, and carries out signal enhancing by the wave filter；With
And
Delay acquisition module, for obtain signal receiving end feedback control signal relative to its insertion position time delay with
Judge the length of transmission line, and the preemphasis degree of the signal originating end of the wave filter is controlled according to the length.
The control method of the signal transmission distance of the present invention may be referred to Fig. 1, and the method is the mistake of adaptive signal enhancement
Journey.After first frame starts, verified depending on controlling signal using coaxial, in signal sending end time delay t1 is obtained.Preferably can increase
Plus a verification regards the process for controlling signal, and the process of this frame is directly terminated when checking incorrect to the signal；Arriving when inspection should
When signal is correct, judge that residing for t1 be which above-mentioned enhancing is interval, the pre-add of signal is carried out according to enhancing interval s1
Weight.
The present invention provides a kind of control method of signal transmission distance, and signal preemphasis is carried out to signal originating end, described
Preemphasis generates pre-emphasis pulse signal by pulse signal generating unit from the serial data signal that external source is received, and signal increases
Strong unit carries out signal enhancing in response to the pre-emphasis pulse signal.Wherein, the control signal fed back using signal receiving end
Delay judgement transmission line length, and the preemphasis degree of the signal originating end is controlled according to the length.Using receiving end
To the coaxial cable transmission delayed data regarded in control signal of originator transmission, accurately judgement can be made to the situation of cable,
Then targetedly strengthened.Can so avoid originating terminal signal preemphasis degree from kicking the beam, not reach signal quality due
Effect, or originating terminal signal preemphasis is overweight, gives receiving terminal transmission error message, produces negative effect.In addition, control signal is adopted
Coaxial is to simulate one of necessary function of high definition now depending on controlling signal, so this part operation can't be to the side of video camera
Case produces extra cost.
Obviously, those skilled in the art can carry out the spirit of various changes and modification without deviating from the present invention to invention
And scope.So, if these modifications of the present invention and modification belong to the claims in the present invention and its equivalent technologies scope it
Interior, then the present invention is also intended to including including these changes and modification.
Claims (9)
1. a kind of control method of signal transmission distance, it is characterised in that signal preemphasis is carried out to originating end, is connect using signal
Receiving end feedback control signal relative to the delay judgement transmission line of its insertion position length, and according to the length control institute
State the preemphasis degree of signal originating end；
Wherein, the preemphasis generates pre-add dicrotism by pulse signal generating unit from the serial data signal that external source is received
Signal is rushed, signal enhancing unit carries out signal enhancing in response to the pre-emphasis pulse signal.
2. the control method of signal transmission distance as claimed in claim 1, it is characterised in that the control signal is coaxially to regard
Control signal, the insertion position is to receive the fixed position after certain horizontal blanking signal in vision signal.
3. the control method of signal transmission distance as claimed in claim 1, it is characterised in that always according to the control of receiving terminal feedback
The attenuation degree of signal waveform processed judges the length of transmission line.
4. the control method of signal transmission distance as claimed in claim 1, it is characterised in that length S of the transmission line
Computing formula is as follows：
Wherein, V is transmission speed of the signal in transmission line, and unit is m/us (about 217m/us)；Delay is the transmission of signal
Time delay, unit is us.
5. the control method of signal transmission distance as claimed in claim 1, it is characterised in that using high-pass filter to signal
The HFS of originating end carries out preemphasis.
6. the control method of signal transmission distance as claimed in claim 5, it is characterised in that the length for judging transmission line is
During 0m-300m, the preemphasis of originating end is not carried out；When judging the length of transmission line for 300m-400m, first is carried out to originating end
Degree preemphasis；When judging the length of transmission line for more than 500m, the second degree preemphasis is carried out to originating end；Second journey
Degree is more than first degree.
7. the control method of signal transmission distance as claimed in claim 6, it is characterised in that the first degree preemphasis
Filter parameter is Fstop=0, Fpass=35, Wstop=0.2, Wpass=40；The filtering of the second degree preemphasis
Device parameter is Fstop=0, Fpass=35, Wstop=0.2, Wpass=120.
8. a kind of control device of signal transmission distance, it is characterised in that include：
Wave filter, to signal originating end signal preemphasis is carried out；
Pulse signal generating unit, the serial data signal for receiving from external source generates pre-emphasis pulse signal；
Signal enhancing unit, in response to the pre-emphasis pulse signal, and carries out signal enhancing by the wave filter；And
Delay acquisition module, for obtain signal receiving end feedback control signal relative to the time delay of its insertion position to judge
The length of transmission line, and the preemphasis degree of the signal originating end of the wave filter is controlled according to the length.
9. the control device of signal transmission distance as claimed in claim 8, it is characterised in that also including A/D module, for right
The control signal of receiving terminal feedback carries out waveform analysis, and judges the length of transmission line according to the attenuation degree of waveform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610844343.5A CN106657858A (en) | 2016-09-22 | 2016-09-22 | Control method and control device for signal transmission distance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610844343.5A CN106657858A (en) | 2016-09-22 | 2016-09-22 | Control method and control device for signal transmission distance |
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| Publication Number | Publication Date |
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| CN106657858A true CN106657858A (en) | 2017-05-10 |
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ID=58853201
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610844343.5A Pending CN106657858A (en) | 2016-09-22 | 2016-09-22 | Control method and control device for signal transmission distance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109104548A (en) * | 2017-12-12 | 2018-12-28 | 上海魔龙机器人科技有限公司 | A kind of video transfer signal self-checking device |
| CN112399098A (en) * | 2020-12-02 | 2021-02-23 | 龙迅半导体（合肥）股份有限公司 | Automatic configuration method and system for output signal intensity of HDMI transmitter |
-
2016
- 2016-09-22 CN CN201610844343.5A patent/CN106657858A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109104548A (en) * | 2017-12-12 | 2018-12-28 | 上海魔龙机器人科技有限公司 | A kind of video transfer signal self-checking device |
| CN112399098A (en) * | 2020-12-02 | 2021-02-23 | 龙迅半导体（合肥）股份有限公司 | Automatic configuration method and system for output signal intensity of HDMI transmitter |
| CN112399098B (en) * | 2020-12-02 | 2024-01-19 | 龙迅半导体（合肥）股份有限公司 | Automatic configuration method and system for output signal strength of HDMI transmitter |
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| WD01 | Invention patent application deemed withdrawn after publication |