CN105828005A - Analog video signal gain compensation method and device - Google Patents
Analog video signal gain compensation method and device Download PDFInfo
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- CN105828005A CN105828005A CN201610134283.8A CN201610134283A CN105828005A CN 105828005 A CN105828005 A CN 105828005A CN 201610134283 A CN201610134283 A CN 201610134283A CN 105828005 A CN105828005 A CN 105828005A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/52—Automatic gain control
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Abstract
The invention discloses an analog video signal gain compensation method and device. The analog video signal gain compensation method comprises the steps that an analog video signal is received at a receiving end; the analog video signal includes a color carrier signal; the first voltage amplitude of the color carrier signal is acquired; the first voltage amplitude is greater than a threshold, and the analog video signal is compensated according to gain determined by the first voltage amplitude; the first voltage amplitude is less than or equal to the threshold, and compensation is performed according to a pre-stored gain curve; the second voltage amplitude of the color carrier signal of the analog video signal after compensation is acquired; and the second voltage amplitude is greater than the threshold, and compensation is performed according to the gain determined by the second voltage amplitude of the color carrier signal. The analog video signal is transmitted at a transmitting end; a reserved gain module is started when a starting instruction used for starting the reserved gain module is received; and the reserved gain module is used for performing amplification according to the reserved gain at the next time of transmitting of the analog video signal. With application of the scheme, an analog video can be effectively compensated under the condition of high bandwidth and long transmission distance.
Description
Technical field
The present invention relates to technical field of image processing, particularly to a kind of analog video signal gain compensating method and device.
Background technology
Along with the bandwidth of high definition analog video improves constantly, increases apart from continuous, analog video is through the transmission of coaxial cable, and decay can further seriously, and balanced realization is the most difficult.Simple dependence is fixed balance parameters and is compensated, and can there is a current attenuation cannot accurately measure, and the problem that the compensation of balance parameters is the highest with the decay matching degree of the channel of coaxial cable composition, there is also the too low problem causing compensating erroneous judgement of signal to noise ratio.
In prior art, after analog video signal transmission, the technical scheme of gain control is mainly: by detection line synchronising signal and color carrier signal amplitude, find the compensating curve matched, then compensate in the template base of compensating curve.
But, analog video rely transmission coaxial cable of a great variety, the parasitic parameter of every kind of cable is different, and under different application, the length of cable is different, the actual channel which results in analogue transmission is Protean, and possible attenuation degree has countless versions.Secondly, analog bandwidth is the biggest, and transmission range is the most remote, and high frequency is the biggest with the decay difference of low-frequency range, and balanced realization difficulty is the biggest.The general 42M of analog bandwidth of the general 24M of analog video bandwidth, 1080p of 720p, along with the upgrading of high definition, the such application demand of 50M, 60M even 100M gradually produces.The one-level isostatic compensation of traditional scheme cannot meet requirement.Furthermore, on coaxial cable, the biggest decay of signal frequency is the biggest, and the transmission range realized under low bandwidth may not necessarily realize under high bandwidth.And, in actual applications, systems soft ware cannot prestore all of equalizer configuration parameter.
Therefore, the deficiencies in the prior art are: in the case of high bandwidth, long transmission distance, analog video can not be carried out effective compensation.
Summary of the invention
The invention provides a kind of analog video signal gain compensating method and device, in order to analog video is carried out effective compensation in the case of high bandwidth, long transmission distance.
The embodiment of the present invention provides a kind of analog video signal gain compensating method, including:
Receive analog video signal；Wherein, described analog video signal includes color carrier signal；
Obtain the first voltage magnitude of color carrier signal；
When the first voltage magnitude of described color carrier signal is more than threshold value, and the gain determined analog video signal by the first voltage magnitude of described color carrier signal compensates；When the first voltage magnitude of described color carrier signal is less than or equal to threshold value, analog video signal is compensated by the gain curve prestored；
Obtain the second voltage magnitude of the color carrier signal of the analog video signal after overcompensation；
When the second voltage magnitude of described color carrier signal is more than threshold value, and the gain determined analog video signal by the second voltage magnitude of described color carrier signal compensates.
It is preferred that farther include:
Obtain the N voltage magnitude of the color carrier signal of the analog video signal after the N-1 time compensates；Wherein, N is the natural number more than 2；
If the N voltage magnitude of described color carrier signal is not reaching to full width, then when the N voltage magnitude of described color carrier signal is more than threshold value, and the gain determined analog video signal by the N voltage magnitude of described color carrier signal compensates.
It is preferred that farther include:
When the second voltage magnitude of described color carrier signal is less than or equal to threshold value, send the open command for opening reserve gain module to transmitting terminal；Wherein, described reserve gain module is for being amplified by reserved gain analog video signal at transmitting terminal.
If it is preferred that reserved gain is fixed value, send the open command for opening reserve gain module；If reserved gain is for having gradational numerical value, sends open command and grade for opening reserve gain module, wherein, after opening reserve gain module, analog video signal is amplified by the gain values of this grade.
It is preferred that farther include:
Analog video signal after compensating is decoded as digital video signal, and according to the quality trim equalizer parameter of this digital video signal, wherein, described parametric equalizer is used for regulating gain.
The embodiment of the present invention provides a kind of analog video signal gain compensating method, including:
Send analog video signal；Wherein, described analog video signal includes color carrier signal；
When receiving the open command for opening reserve gain module, open reserve gain module；Wherein, described reserve gain module for upper once send analog video signal time analog video signal is amplified by reserved gain.
It is preferred that described reserve gain module is power device or amplifier chip.
It is preferred that described power device is audion or metal-oxide-semiconductor.
If it is preferred that reserved gain is fixed value, receive the open command for opening reserve gain module；If reserved gain is for having gradational numerical value, receive open command and grade for opening reserve gain module, wherein, after opening reserve gain module upper once send analog video signal time analog video signal is amplified by the gain values of this grade.
The embodiment of the present invention provides a kind of analog video signal gain compensation means, including:
Receiver module, is used for receiving analog video signal；Wherein, described analog video signal includes color carrier signal；
First acquisition module, for obtaining the first voltage magnitude of color carrier signal；
First compensating module, for the first voltage magnitude when described color carrier signal more than threshold value, the gain determined analog video signal by the first voltage magnitude of described color carrier signal compensates；When the first voltage magnitude of described color carrier signal is less than or equal to threshold value, analog video signal is compensated by the gain curve prestored；
Second acquisition module, for obtaining the second voltage magnitude of the color carrier signal of the analog video signal after overcompensation；
Second compensating module, for the second voltage magnitude when described color carrier signal more than threshold value, the gain determined analog video signal by the second voltage magnitude of described color carrier signal compensates.
It is preferred that farther include:
N acquisition module, for obtaining the N voltage magnitude of the color carrier signal of the analog video signal after the N-1 time compensates；Wherein, N is the natural number more than 2；
N compensating module, if the N voltage magnitude for described color carrier signal is not reaching to full width, then when the N voltage magnitude of described color carrier signal is more than threshold value, and the gain determined analog video signal by the N voltage magnitude of described color carrier signal compensates.
It is preferred that farther include:
First sending module, for the second voltage magnitude when described color carrier signal less than or equal to threshold value, sends the open command for opening reserve gain module to transmitting terminal；Wherein, described reserve gain module is for being amplified by reserved gain analog video signal at transmitting terminal.
If it is preferred that it is fixed value that the first sending module is further used for reserved gain, sending the open command for opening reserve gain module；If reserved gain is for having gradational numerical value, sends open command and grade for opening reserve gain module, wherein, after opening reserve gain module, analog video signal is amplified by the gain values of this grade.
It is preferred that farther include: fine setting module, the analog video signal after compensating is decoded as digital video signal, and according to the quality trim equalizer parameter of this digital video signal, wherein, described parametric equalizer is used for regulating gain.
The present invention has the beneficial effect that:
In the technical scheme that the embodiment of the present invention provides, due in the case of high bandwidth, long transmission distance, analog video signal decay is even more serious, therefore, at receiving terminal, the voltage magnitude and twice analog video signal through obtaining the color carrier signal of analog video signal for twice compensates can accurate compensating gain；The threshold value of the voltage magnitude of color carrier signal is set, can avoid producing gain erroneous judgement when the voltage magnitude of color carrier signal is less.At transmitting terminal, receive open command and open reserve gain module；Described reserve gain module for upper once send analog video signal time analog video signal is amplified by reserved gain, transmission range can be extended.Therefore, this programme is used in the case of high bandwidth, long transmission distance, analog video can be carried out effective compensation.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the present invention, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is to simulate video gain compensation method implementing procedure schematic diagram (a) in the embodiment of the present invention；
Fig. 2 is 1# compensating curve figure in the embodiment of the present invention；
Fig. 3 is to simulate video gain compensation method implementing procedure schematic diagram (b) in the embodiment of the present invention；
Fig. 4 is simulation Video transmission system structural representation in the embodiment of the present invention；
Fig. 5 is equalizer internal module schematic diagram (a) in the embodiment of the present invention；
Fig. 6 is equalizer internal module schematic diagram (b) in the embodiment of the present invention；
Fig. 7 is to simulate video gain compensation method in the embodiment of the present invention to be embodied as schematic flow sheet；
Fig. 8 is simulation video gain compensation device structural representation in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is illustrated.
Inventor notices that existing analog video signal gain compensation scheme mainly has the most several during invention:
1, according to voltage magnitude and the analog video signal colour difference signal calculating simulation video signal after the transmission decay characteristics value after transmission of analog video signal row synchronous head signal, then the transmission cable equivalent length value determined according to decay characteristics value, concentrate at default gain curve and determine the gain curve that analog video signal is corresponding, according to the frequency band shared by gain curve yield value at different frequencies and analog video signal, analog video signal is carried out gain control.
2, the eigenvalue of each predefined nonlinear curve is determined respectively according to the chrominance subcarrier frequency of analog video signal, predefined nonlinear curve and transmission cable type one_to_one corresponding, then according to the nonlinear curve corresponding with the eigenvalue of the loss parameter value coupling of the analog video signal determined, determine non-linear automatic growth control AGC (AutomaticGainControl, automatic growth control) parameter of curve combination, and utilize the Nonlinear A GC parameter of curve determined combination that analog video signal is transmitted loss balancing.
3, the cable characteristic having according to the cable of transmission of analogue signal selects the gain template processing analogue signal, then determine the overall gain value of analogue signal according to the non-linear gain value sum that the reference gain value of the gain template acquisition analogue signal low-frequency range selected is corresponding with analogue signal high band, according to overall gain value, analogue signal is carried out gain control.
From above scheme it can be seen that
1, gain compensation is the gain compensation of single-stage, enters compensation model after equalizer module one-time detection, and under the application demand that bandwidth is the highest, one pass gain compensates and cannot meet requirement；
2, exist color carrier signal amplitude less time gain erroneous judgement drawback；
3, video transmission device does not has gain amplification module, and during long-distance transmissions, signal to noise ratio is the lowest.
Based on this, the embodiment of the present invention proposes a kind of analog video signal gain compensating method, in order to analog video is carried out effective compensation in the case of high bandwidth, long transmission distance.
First the analog video signal gain compensating method implemented receiving terminal illustrates.
Fig. 1 is analog video signal gain compensating method implementing procedure schematic diagram (a), as it can be seen, may include steps of:
Step 101, reception analog video signal；Wherein, described analog video signal includes color carrier signal；
Step 102, the first voltage magnitude of acquisition color carrier signal；
Step 103, when the first voltage magnitude of described color carrier signal is more than threshold value, and the gain determined analog video signal by the first voltage magnitude of described color carrier signal compensates；When the first voltage magnitude of described color carrier signal is less than or equal to threshold value, analog video signal is compensated by the gain curve prestored；
Step 104, obtain the second voltage magnitude of the color carrier signal of analog video signal after overcompensation；
Step 105, when the second voltage magnitude of described color carrier signal is more than threshold value, and the gain determined analog video signal by the second voltage magnitude of described color carrier signal compensates.
High frequency under the enforcement of step 102, high bandwidth is differed greatly, especially after long range propagation with low-frequency range decay.The attenuation amplitude of analog video signal can be judged by the voltage magnitude of the row synchronous head signal in detection analog video signal and color carrier signal, again because the color carrier signal attenuation under high bandwidth is even more serious, therefore can select to detect the voltage magnitude of color carrier signal.
For the enforcement of step 103, when the voltage magnitude of color carrier signal is the least, amplitude detection sensitivity decrease is a lot, offset can be caused erroneous judgement, cause error of compensation.Therefore, the voltage magnitude of carrier signal of checking colors is provided with a threshold value, if the voltage magnitude of color carrier signal is more than threshold value, it is contemplated that factors such as signal to noise ratios, one step gain should not be too big, take the 1/3 of full width at this as the standard of compensation of the first order.If the voltage magnitude of color carrier signal is less than threshold value, directly using the 1# compensating curve as shown in Figure 2 prestored, this curve is the first order indemnifying measure less than threshold value of the voltage magnitude for color carrier signal, comparatively speaking, adds the compensating gain of high band.
For step 104 and the enforcement of step 105, after the first order compensates, carrying out the voltage magnitude of secondary detection color carrier signal, if the voltage magnitude of color carrier signal is more than threshold value, then the second level completes the compensation of full width.So, can accurate compensating gain by the method for twice detection.
In enforcement, it is also possible to farther include:
Obtain the N voltage magnitude of the color carrier signal of the analog video signal after the N-1 time compensates；Wherein, N is the natural number more than 2；
If the N voltage magnitude of described color carrier signal is not reaching to full width, then when the N voltage magnitude of described color carrier signal is more than threshold value, and the gain determined analog video signal by the N voltage magnitude of described color carrier signal compensates.
Concrete, it is also possible to by the voltage magnitude of repeated detection color carrier signal, and the gain determined by the voltage magnitude of the color carrier signal detected repeatedly compensates, until the voltage magnitude of the color carrier signal detected approaches full width voltage.For example, after the second level compensates, continue to obtain the tertiary voltage amplitude of the color carrier signal of the analog video signal after overcompensation；When the tertiary voltage amplitude of described color carrier signal is more than threshold value, and the gain determined analog video signal by the tertiary voltage amplitude of described color carrier signal compensates；By that analogy, the voltage magnitude until the color carrier signal of the analog video signal after compensating approaches full width voltage.
For the voltage magnitude of color carrier signal after the second level compensates in such scheme still less than or during equal to threshold value the scheme taked carry out as described below.
In enforcement, it is also possible to farther include:
When the second voltage magnitude of described color carrier signal is less than or equal to threshold value, send the open command for opening reserve gain module to transmitting terminal；Wherein, described reserve gain module is for being amplified by reserved gain analog video signal at transmitting terminal.
Concrete, after receiving terminal carries out second level compensation to analog video signal, the voltage magnitude of color carrier signal is still less than threshold value, illustrate that transmission range causes analog video signal decay the biggest too far, now can only send the open command for opening reserve gain module, reserve gain module is the device of transmitting terminal, and for being amplified analog video signal by the gain values of this grade, the voltage magnitude of color carrier signal also can and then improve.
In enforcement, if reserved gain is fixed value, send the open command for opening reserve gain module；If reserved gain is for having gradational numerical value, sends open command and grade for opening reserve gain module, wherein, after opening reserve gain module, analog video signal is amplified by the gain values of this grade.
Concrete, for the simple and reliable property designed, gain can be made fixing, so, the instruction that receiving terminal sends can be relatively easy, needs only need to send an open command when opening reserve gain module the most permissible；If motility and the power consumption consideration for scheme, gain can be made adjustable, such as divide three stage gain shelves, the instruction that receiving terminal sends is relative complex, send an open command and specify a gain level, analog video signal is amplified after receiving instruction by transmitting terminal by the gain of this grade, and the voltage magnitude of color carrier signal also can and then improve.
When analog video signal compensates complete, and equalizer can be finely adjusted by receiving terminal, improves image further, is specifically introduced below.
In enforcement, farther include:
Analog video signal after compensating is decoded as digital video signal, and according to the quality trim equalizer parameter of this digital video signal, wherein, described parametric equalizer is used for regulating gain.
Concrete, receiving terminal includes analog video decoder device, can be decoded analog video signal, but also have image analysis function.After analog video signal is decoded by receiving terminal, picture quality is analyzed, such as image saturation, brightness etc., as required can be with the parameter of trim equalizer, the parameter of equalizer can be used to regulate gain, to improve image further.
The analog video signal gain compensating method implemented transmitting terminal below illustrates.
Fig. 3 is analog video signal gain compensating method implementing procedure schematic diagram (b), as it can be seen, may include steps of:
Step 301, transmission analog video signal；Wherein, described analog video signal includes color carrier signal；
Step 302, when receiving the open command for opening reserve gain module, open reserve gain module；Wherein, described reserve gain module for upper once send analog video signal time analog video signal is amplified by reserved gain.
For the enforcement of step 302, reserve gain module is the device of transmitting terminal, for being amplified the analog video signal sent by reserved gain next time.Cause analog video signal decay the biggest too far due to transmission range, after the second level of analog video signal is compensated by receiving terminal, the voltage magnitude of color carrier signal still less than or equal to set threshold value, at this moment transmitting terminal can receive the open command for opening reserve gain module, being amplified the analog video signal next time sent by reserved gain, the voltage magnitude of color carrier signal also can and then improve.
In enforcement, described reserve gain module is power device or amplifier chip.
In enforcement, described power device is audion or MOS (metal (metal)-oxide (oxid)-quasiconductor (semiconductor) field-effect transistor) pipe.
Concrete, the implementation method of reserve gain module has multiple, is such as realized by power device, as met the audion of bandwidth requirement, metal-oxide-semiconductor etc., it is possible to use multiple amplifier chip realizes.
In enforcement, if reserved gain is fixed value, receive the open command for opening reserve gain module；If reserved gain is for having gradational numerical value, receive open command and grade for opening reserve gain module, wherein, after opening reserve gain module upper once send analog video signal time analog video signal is amplified by the gain values of this grade.
Concrete, for the simple and reliable property designed, gain can be made fixing, so, the instruction that transmitting terminal receives is relatively easy, just can open reserve gain module after sending an open command.If motility and the power consumption consideration for scheme, gain can be made adjustable, such as divide three stage gain shelves, the instruction that transmitting terminal receives is relative complex, after receiving an open command and specifying a gain level, being amplified analog video signal by the gain values of this grade, the voltage magnitude of color carrier signal also can and then improve.
In order to be more clearly understood that this programme, illustrate with instantiation below.
First the hardware configuration realized scheme illustrates.
Fig. 4 is Analogvideotransmission system structure schematic diagram, including: discharger 401, equalizer 402, analog video decoder device 403, coaxial cable 404, IIC (Inter-IntegratedCircuit, IC bus) bus 405, MOS switch 406.
Discharger 401, including reserve gain amplification module, is used for sending analog video signal, and when receiving the control signal that opposite direction is sent, reserve gain amplification module is activated, and is amplified analog video signal to be sent by reserve gain；
Equalizer 402, compensates the analog video after decaying through transmission for realization, and the isostatic compensation ability of this equalizer can pass through IIC Communication Control；
Analog video decoder device 403, for realizing the conversion from analog video to digital video, but also can have the ability of graphical analysis, i.e. can be analyzed the digital video signal after decoding, it is possible to trim equalizer parameter；
Coaxial cable 404, is used for transmitting analog video and direction controlling order；
Iic bus 405, is used for controlling trim equalizer parameter；
MOS switch 406, by 406 can realize Reverse Turning Control order be added on the video signal on coaxial cable control discharger 401 purpose.
In the above-mentioned Analogvideotransmission system internal structure of equalizer 402 is described below.
Fig. 5 is equalizer internal module schematic diagram (a), as it can be seen, mainly include signal processing module 501, amplification module 502, signal processing module 503, amplification module 504 inside balance module.Signal processing module 501,503 is respectively used to voltage magnitude and the voltage magnitude of second level detection color carrier signal of first order detection color carrier signal；Amplification module 502,504 is respectively used to that the analog video signal of decay carries out first order compensation and the second level compensates.
Certainly, if the single-stage amplifying circuit of equalizer internal module can meet bandwidth requirement, it is possible to use equalizer internal module schematic diagram (b) as shown in Figure 6 realizes.Signal processing module 601, amplification module 602, signal processing module 603 is mainly included inside balance module.Signal processing module 601,603 is respectively used to voltage magnitude and the voltage magnitude of second level detection color carrier signal of first order detection color carrier signal；Amplification module 602 for carrying out first order compensation and second level compensation to the analog video signal of decay.
Two kinds of schematic diagrams of Fig. 5 and Fig. 6 employ the mode of twice signal processing, actual mechanical process is not limited to twice detection, it is possible to use the scheme that repeated detection is approached.
Equalizer 402 in above-mentioned Analogvideotransmission system uses the scheme of Fig. 5, is specifically described the analog video signal gain compensating method under this hardware environment below.
Fig. 7 is that analog video signal gain compensating method is embodied as schematic flow sheet, as it can be seen, may include steps of:
Step 701, video transmission device send analog video signal；
Step 702, equalizer output signal processing module carry out first order detection and obtain the voltage magnitude x of color carrier signal；
Step 703, judge that the voltage magnitude x of color carrier signal, whether more than threshold value, if so, proceeds to step 704, proceeds to step 705 if not；
Analog video signal is pressed color carrier gain by step 704, equalizer amplification moduleCarry out first order amplification, proceed to step 706；
Analog video signal is carried out first order amplification by the 1# curve that prestores by step 705, equalizer amplification module, proceeds to step 706；
Step 706, equalizer output signal processing module carry out second level detection and obtain the voltage magnitude x of color carrier signal,；
Step 707, judge the voltage magnitude x of color carrier signal, if more than threshold value, if so, proceed to step 708, proceed to step 709 if not；
Analog video signal is pressed color carrier gain by step 708, equalizer amplification moduleCarry out second level amplification, proceed to step 710；
Step 709, IIC communicate with reception device, receive device notice discharger and open reserve gain amplification module, proceed to step 701；
Video is decoded by step 710, the analog video decoder device received in device, and then reception device is to video quality analysis, and trim equalizer as required proceeds to step 711；
Step 711, end.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of analog video signal gain compensation means, owing to the principle of these equipment solution problem is similar to a kind of analog video signal gain compensating method, therefore the enforcement of these equipment may refer to the enforcement of method, repeats no more in place of repetition.
Fig. 8 is analog video signal gain compensation means structural representation, as it can be seen, may include that in device
Receiver module 801, is used for receiving analog video signal；Wherein, described analog video signal includes color carrier signal；
First acquisition module 802, for obtaining the first voltage magnitude of color carrier signal；
First compensating module 803, for the first voltage magnitude when described color carrier signal more than threshold value, the gain determined analog video signal by the first voltage magnitude of described color carrier signal compensates；When the first voltage magnitude of described color carrier signal is less than or equal to threshold value, analog video signal is compensated by the gain curve prestored；
Second acquisition module 804, for obtaining the second voltage magnitude of the color carrier signal of the analog video signal after overcompensation；
Second compensating module 805, for the second voltage magnitude when described color carrier signal more than threshold value, the gain determined analog video signal by the second voltage magnitude of described color carrier signal compensates.
In enforcement, it is also possible to farther include:
N acquisition module 806, for obtaining the N voltage magnitude of the color carrier signal of the analog video signal after the N-1 time compensates；Wherein, N is the natural number more than 2；
N compensating module 807, if the N voltage magnitude for described color carrier signal is not reaching to full width, then when the N voltage magnitude of described color carrier signal is more than threshold value, and the gain determined analog video signal by the N voltage magnitude of described color carrier signal compensates.
In enforcement, it is also possible to farther include:
Sending module, for the second voltage magnitude when described color carrier signal less than or equal to threshold value, sends the open command for opening reserve gain module to transmitting terminal；Wherein, described reserve gain module is for being amplified by reserved gain analog video signal at transmitting terminal.
In enforcement, if it is fixed value that sending module can also be further used for reserved gain, send the open command for opening reserve gain module；If reserved gain is for having gradational numerical value, sends open command and grade for opening reserve gain module, wherein, after opening reserve gain module, analog video signal is amplified by the gain values of this grade.
In enforcement, it is also possible to farther include: fine setting module, the analog video signal after compensating is decoded as digital video signal, and according to the quality trim equalizer parameter of this digital video signal, wherein, described parametric equalizer is used for regulating gain.
In sum, in the technical scheme that the embodiment of the present invention provides, due in the case of high bandwidth, long transmission distance, analog video signal decay is even more serious, therefore, at receiving terminal, the voltage magnitude and twice analog video signal through obtaining the color carrier signal of analog video signal for twice compensates can accurate compensating gain；The threshold value of the voltage magnitude of color carrier signal is set, can avoid producing gain erroneous judgement when the voltage magnitude of color carrier signal is less.At transmitting terminal, receive open command and open reserve gain module；Described reserve gain module for upper once send analog video signal time analog video signal is amplified by reserved gain, transmission range can be extended.Therefore, this programme is used in the case of high bandwidth, long transmission distance, analog video can be carried out effective compensation.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program.Therefore, the form of the embodiment in terms of the present invention can use complete hardware embodiment, complete software implementation or combine software and hardware.And, the present invention can use the form at one or more upper computer programs implemented of computer-usable storage medium (including but not limited to disk memory and optical memory etc.) wherein including computer usable program code.
The present invention is to describe with reference to method, equipment (system) and the flow chart of computer program according to embodiments of the present invention and/or block diagram.It should be understood that can be by the flow process in each flow process in computer program instructions flowchart and/or block diagram and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These computer program instructions can be provided to produce a machine to the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device so that the instruction performed by the processor of computer or other programmable data processing device is produced for realizing the device of function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and can guide in the computer-readable memory that computer or other programmable data processing device work in a specific way, the instruction making to be stored in this computer-readable memory produces the manufacture including command device, and this command device realizes the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make to perform sequence of operations step on computer or other programmable devices to produce computer implemented process, thus the instruction performed on computer or other programmable devices provides the step of the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame for realization.
Obviously, those skilled in the art can carry out various change and modification without departing from the spirit and scope of the present invention to the present invention.So, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (14)
1. an analog video signal gain compensating method, it is characterised in that including:
Receive analog video signal；Wherein, described analog video signal includes color carrier signal；
Obtain the first voltage magnitude of color carrier signal；
When the first voltage magnitude of described color carrier signal is more than threshold value, and the gain determined analog video signal by the first voltage magnitude of described color carrier signal compensates；When the first voltage magnitude of described color carrier signal is less than or equal to threshold value, analog video signal is compensated by the gain curve prestored；
Obtain the second voltage magnitude of the color carrier signal of the analog video signal after overcompensation；
When the second voltage magnitude of described color carrier signal is more than threshold value, and the gain determined analog video signal by the second voltage magnitude of described color carrier signal compensates.
Method the most according to claim 1, it is characterised in that farther include:
Obtain the N voltage magnitude of the color carrier signal of the analog video signal after the N-1 time compensates；Wherein, N is the natural number more than 2；
If the N voltage magnitude of described color carrier signal is not reaching to full width, then when the N voltage magnitude of described color carrier signal is more than threshold value, and the gain determined analog video signal by the N voltage magnitude of described color carrier signal compensates.
Method the most according to claim 1 and 2, it is characterised in that farther include:
When the second voltage magnitude of described color carrier signal is less than or equal to threshold value, send the open command for opening reserve gain module to transmitting terminal；Wherein, described reserve gain module is for being amplified by reserved gain analog video signal at transmitting terminal.
Method the most according to claim 3, it is characterised in that if reserved gain is fixed value, sends the open command for opening reserve gain module；If reserved gain is for having gradational numerical value, sends open command and grade for opening reserve gain module, wherein, after opening reserve gain module, analog video signal is amplified by the gain values of this grade.
5. according to the arbitrary described method of Claims 1-4, it is characterised in that farther include:
Analog video signal after compensating is decoded as digital video signal, and according to the quality trim equalizer parameter of this digital video signal, wherein, described parametric equalizer is used for regulating gain.
6. an analog video signal gain compensating method, it is characterised in that including:
Send analog video signal；Wherein, described analog video signal includes color carrier signal；
When receiving the open command for opening reserve gain module, open reserve gain module；Wherein, described reserve gain module for upper once send analog video signal time analog video signal is amplified by reserved gain.
Method the most according to claim 6, it is characterised in that described reserve gain module is power device or amplifier chip.
Method the most according to claim 7, it is characterised in that described power device is audion or metal-oxide-semiconductor.
Method the most according to claim 6, it is characterised in that if reserved gain is fixed value, receives the open command for opening reserve gain module；If reserved gain is for having gradational numerical value, receive open command and grade for opening reserve gain module, wherein, after opening reserve gain module upper once send analog video signal time analog video signal is amplified by the gain values of this grade.
10. an analog video signal gain compensation means, it is characterised in that including:
Receiver module, is used for receiving analog video signal；Wherein, described analog video signal includes color carrier signal；
First acquisition module, for obtaining the first voltage magnitude of color carrier signal；
First compensating module, for the first voltage magnitude when described color carrier signal more than threshold value, the gain determined analog video signal by the first voltage magnitude of described color carrier signal compensates；When the first voltage magnitude of described color carrier signal is less than or equal to threshold value, analog video signal is compensated by the gain curve prestored；
Second acquisition module, for obtaining the second voltage magnitude of the color carrier signal of the analog video signal after overcompensation；
Second compensating module, for the second voltage magnitude when described color carrier signal more than threshold value, the gain determined analog video signal by the second voltage magnitude of described color carrier signal compensates.
11. devices according to claim 10, it is characterised in that farther include:
N acquisition module, for obtaining the N voltage magnitude of the color carrier signal of the analog video signal after the N-1 time compensates；Wherein, N is the natural number more than 2；
N compensating module, if the N voltage magnitude for described color carrier signal is not reaching to full width, then when the N voltage magnitude of described color carrier signal is more than threshold value, and the gain determined analog video signal by the N voltage magnitude of described color carrier signal compensates.
12. according to the device described in claim 10 or 11, it is characterised in that farther include:
First sending module, for the second voltage magnitude when described color carrier signal less than or equal to threshold value, sends the open command for opening reserve gain module to transmitting terminal；Wherein, described reserve gain module is for being amplified by reserved gain analog video signal at transmitting terminal.
13. devices according to claim 12, it is characterised in that if it is fixed value that the first sending module is further used for reserved gain, send the open command for opening reserve gain module；If reserved gain is for having gradational numerical value, sends open command and grade for opening reserve gain module, wherein, after opening reserve gain module, analog video signal is amplified by the gain values of this grade.
14. according to the arbitrary described device of claim 10 to 13, it is characterized in that, farther include: fine setting module, analog video signal after compensating is decoded as digital video signal, and according to the quality trim equalizer parameter of this digital video signal, wherein, described parametric equalizer is used for regulating gain.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106507020A (en) * | 2016-11-24 | 2017-03-15 | 杭州雄迈集成电路技术有限公司 | Coaxial adaptive modeling high definition transmission antidamping device and method based on differential compensation |
| CN107094239A (en) * | 2017-04-24 | 2017-08-25 | 浙江大华技术股份有限公司 | A kind of method and apparatus for determining video format information |
| CN117439596A (en) * | 2023-08-09 | 2024-01-23 | 慷智集成电路(上海)有限公司 | Receiving circuit, deserializing circuit chip, electronic equipment and vehicle |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710891A (en) * | 2012-05-16 | 2012-10-03 | 浙江大华技术股份有限公司 | Nonlinear gain control method and device as well as equipment |
| CN102724514A (en) * | 2012-05-16 | 2012-10-10 | 浙江大华技术股份有限公司 | Method and device for compensating transmission loss of analog video signal and equipment for receiving analog video signal |
| CN103152584A (en) * | 2012-07-20 | 2013-06-12 | 浙江大华技术股份有限公司 | Method and system of analog video signal gain control |
| JP2014000142A (en) * | 2012-06-15 | 2014-01-09 | Hoya Corp | Endoscope apparatus |
-
2016
- 2016-03-09 CN CN201610134283.8A patent/CN105828005B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710891A (en) * | 2012-05-16 | 2012-10-03 | 浙江大华技术股份有限公司 | Nonlinear gain control method and device as well as equipment |
| CN102724514A (en) * | 2012-05-16 | 2012-10-10 | 浙江大华技术股份有限公司 | Method and device for compensating transmission loss of analog video signal and equipment for receiving analog video signal |
| JP2014000142A (en) * | 2012-06-15 | 2014-01-09 | Hoya Corp | Endoscope apparatus |
| CN103152584A (en) * | 2012-07-20 | 2013-06-12 | 浙江大华技术股份有限公司 | Method and system of analog video signal gain control |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106507020A (en) * | 2016-11-24 | 2017-03-15 | 杭州雄迈集成电路技术有限公司 | Coaxial adaptive modeling high definition transmission antidamping device and method based on differential compensation |
| CN106507020B (en) * | 2016-11-24 | 2023-08-25 | 杭州雄迈集成电路技术股份有限公司 | Coaxial self-adaptive simulation high-definition transmission anti-attenuation device and method based on differential compensation |
| CN107094239A (en) * | 2017-04-24 | 2017-08-25 | 浙江大华技术股份有限公司 | A kind of method and apparatus for determining video format information |
| CN117439596A (en) * | 2023-08-09 | 2024-01-23 | 慷智集成电路(上海)有限公司 | Receiving circuit, deserializing circuit chip, electronic equipment and vehicle |
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