CN102075724B - Adaptive balanced and non-balanced dual mode video receiving chip - Google Patents
Adaptive balanced and non-balanced dual mode video receiving chip Download PDFInfo
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- CN102075724B CN102075724B CN 200910189533 CN200910189533A CN102075724B CN 102075724 B CN102075724 B CN 102075724B CN 200910189533 CN200910189533 CN 200910189533 CN 200910189533 A CN200910189533 A CN 200910189533A CN 102075724 B CN102075724 B CN 102075724B
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Abstract
The invention discloses an adaptive balanced and non-balanced dual mode video receiving chip, which comprises a balanced and non-balanced video signal input unit, a balanced video signal amplifying unit, a balanced and non-balanced signal driving unit, a video synchronous separating and clamping unit, a video signal digitalization processing unit, an intelligent phase and gain compensation operating control unit, a high and low frequency phase and gain compensation unit, and a state indicating and function setting unit. The adaptive balanced and non-balanced dual mode video receiving chip has the advantages of adaptive balanced signal and non-balanced video signal receiving, adaptive balanced signal polarity and function of outputting a balanced and non-balanced signal. The receiving adaptation is that: the chip automatically identifies the source of a video signal, automatically analyzes and calculates the phase, the gain and the loss of an input signal, and compensates and recovers the video signal to the largest extent; and the polarity adaptation is that: the polarity of the balanced signal can transposed. The adaptive balanced and non-balanced dual mode video receiving chip is used for adaptive video receiving and relaying equipment.
Description
Technical field
The present invention relates to a kind of video reception chip, espespecially a kind of for the cable video receiving equipments such as closed-circuit television imaging monitoring and visible building intercommunication, digital VTR twisted-pair feeder or the required integrated circuit (IC) chip such as coaxial video receive path, video repeater.
Background technology
In traditional video monitoring engineering, coaxial cable is used to grow the video signal transmission of distance.Constantly soaring along with the wire rod price, wire rod cost shared proportion in whole video monitoring system is more and more higher.Adopt twisted-pair feeder to realize the video signal transmission of longer distance, have easy construction, economic dispatch advantage, therefore the trend of alternative coaxial cable arranged gradually.Different from coaxial cable transmission non-equilibrium signal, Double-strand transmission be balanced signal, therefore in order to realize the transmission of long-distance video signal, need to increase the conversion equipment (Balun) that non-equilibrium signal turns balanced signal in the vision signal source, increase the receiving equipment that balanced signal turns non-equilibrium signal at receiving terminal, so that access digital VTR or monitor are monitored.
No matter be with coaxial cable or Double-strand transmission analog video signal, vision signal all can be along with the increase of the length of cable and is decayed.In order to realize that the good correct of vision signal recovers, need to be at transmitting terminal or receiving terminal according to length of cable manual adjustment low-and high-frequency phase place and gain compensation, main toggle switch and the knob of adopting regulated at present.Concrete operations be the commissioning staff by visually observing, the quality of regulation of image is carried out subjective judgement, again the manual adjustments compensation is carried out in the gain of vision signal and high frequency attenuation.
There is following shortcoming in the existing compensation way of regulating manually in the practical engineering application environment:
1. in the engineering site installation, mounting condition and construction environment vary, and manually debugging work load is larger, and cost of labor is higher;
2. because the difference of commissioning staff's experience and quality, and the engineering debug result is take commissioning staff's subjective judgement as main, and transmission equipment differs and debugs in optimum state surely.Therefore, project quality is larger to commissioning staff's quality and experience dependence, and the consistency of project quality is relatively poor;
3. when video signal long-distance transmission, transmitting terminal and receiving terminal all need manual adjustment, add commissioning staff's criterion disunity, and uniting and adjustment are very difficult;
4. need often to switch the occasion of different length receive path at some, such as the video receiver of visible building intercommunication etc., can not switch all manual adjustments once at every turn.
If employing self adaptive receiving apparatus, no matter be to adopt coaxial cable or twisted-pair line transmission video signal, equipment itself can both be automatically according to input-signal judging signal attenuation degree, automatically finish the compensation to low-and high-frequency phase place and gain loss, need not artificial participation, greatly reduce difficulty of construction, saved human cost, improved the consistency of project quality.Only a few producer adopts the self adaptive receiving apparatus of universal component design to exist cost high at present, poor reliability, and therefore the problem that cost performance is low is difficult to be widely used.
Summary of the invention
The objective of the invention is to be to provide a kind of difference according to the receiving video signals decay, the integrated circuit (IC) chip of auto-compensation low-and high-frequency phase place and gain loss.But this chip receiving balance or non-equilibrium vision signal are inputted, and automatically identify the polarity of balanced signal, and automatic compensating signal phase place and gain loss need not manual adjustment, simplify user's operation.
For achieving the above object, the present invention adopts following functional structure:
Balance-non-equilibrium vision signal input unit;
Balance-non-equilibrium input unit comes power sense circuit by signal, non-equilibrium balancing circuitry and one group of analog switching circuit formation of turning.By detecting balance input or the input signal of non-equilibrium input, the judgment signal source.If balanced signal input, then according to the effective differentiation to synchronizing signal of intelligent phase place and gain compensation Operations Analysis, control simulation switching over balanced signal polarity; If the non-equilibrium signal input then transfers non-equilibrium signal to balanced signal, as the input of balance vision signal amplifying unit.By the switching of control simulation switch, make chip both support the balance vision signal of the input take unshielded twisted pair as carrier, also support the non-equilibrium vision signal take coaxial cable as carrier.Realize simultaneously balanced signal polarity self adaptation, Practical Project need not to distinguish balanced signal polarity in installing.
Balance vision signal amplifying unit;
The essence of balance vision signal amplifying unit is the variable gain video amplifier that a feedback control loop is subjected to external control.It is according to the computing Output rusults of intelligent phase place and gain compensation Operations Analysis, electric capacity and the resistor network structure of control low-and high-frequency phase place and gain compensation unit, change the feedback control loop parameter that is linked into variable gain amplifier, thereby realize the compensation to input balance vision signal phase place and gain.
Balance-non-equilibrium signal driver element;
Balance-non-equilibrium signal driver element is made of a balanced signal drive circuit and a non-equilibrium signal drive circuit, receive the output signal of self-balancing vision signal amplifying unit, enable by external terminal or register setting, both also exportable non-equilibrium signal of exportable balanced signal.Therefore the present invention both can be used for video reception apparatus, also can be used for the video trunking.
Audio video synchronization is separated and the clamper unit;
Audio video synchronization is separated and the clamper unit comprises video clamp circuit and sync separator circuit.Video clamping circuit is clamped to preset level with incoming video signal, separates in order to finish synchronizing signal.Synchronizing signal in the vision signal of sync separator circuit after with clamper is extracted, and transfers digital signal to and export the validity that intelligent phase place and gain compensation Operations Analysis are used for judging vision signal to.
Vision signal digitisation processing unit;
Vision signal digitisation processing unit is the output with balance vision signal amplifying unit, signal after non-equilibrium drive circuit conversion is sampled according to the sequencing control of intelligent phase place and gain compensation Operations Analysis, and exports the digitized sampling result to intelligent phase place and gain compensation Operations Analysis.
Intelligence phase place and gain compensation Operations Analysis;
Intelligence phase place and gain compensation Operations Analysis are the cores of whole circuit, comprise digitisation control circuit and intelligent arithmetic control circuit.The digitisation control circuit for the sampling time sequence of control vision signal digitisation processing unit, is guaranteed the correct sampling to vision signal.The intelligence arithmetic control circuit is according to sampled result and the synchronizing signal of input signal, rely on the intelligent phase gain backoff algorithm of the engineering experience modeling of long-term accumulation, calculate the parameter that needs compensation, the output of control low-and high-frequency phase place and gain compensation unit connects adjusts balance vision signal amplifying unit parameter, realize best compensation effect, whole compensation process is finished automatically, need not manual adjustment.
Low-and high-frequency phase place and gain compensation unit;
The essence of low-and high-frequency phase place and gain compensation unit is by the electric capacity of one group of analog switch and different value, the circuit network that resistance consists of.By receiving the state from the control signal control simulation switch of intelligent phase place and gain compensation Operations Analysis, electric capacity, resistor network combination that conversion is different are linked into balance vision signal amplifying unit and regulate low-and high-frequency phase place and gain compensation parameters.
State indication and function setting unit;
Digital state indication pin and serial function setting and fetch interface are provided, allow external microcontroller, microprocessor, the operating state that programmable logic array or other digital processing circuits are inquired about chip as required perhaps arranges some specific function.
Above-mentioned all circuit units all are integrated in monolithic integrated circuit chip, and outward element is less, are simple and easy to use.
Advantage based on the bimodulus video receiver of the present invention design is: by the decay of intellectual analysis incoming video signal, calculate phase place and gain compensation parameters, control correlative compensation circuit, low-and high-frequency gain and phase place to input signal compensate, and recover to greatest extent because the signal attenuation that long Distance Transmission causes.
Because characteristics of the present invention are the bimodulus self adaptation, and the polarity self adaptation, and built-in balance-non-equilibrium signal driving, so that this chip can be used for designing coaxial cable and twisted-pair visual frequency receiving equipment and trunking, the built-in receive path of digital VTR etc.Because self adaptation characteristics of the present invention can greatly reduce the debugging work load in the work progress, reduce project quality to the dependence of debugging peopleware and experience, improve the quality consistency of video monitoring engineering.
Description of drawings
Fig. 1 is structure calcspar of the present invention.
Fig. 2 is the automatic adjustment algorithm flow chart of the present invention.
The primary clustering symbol description:
UTP twisted-pair feeder binding post;
COAX coaxial cable binding post;
S1 balance-Non-equilibrium Molecular Dynamics Simulation Study vision signal input unit;
A1 balance vision signal amplifying unit;
D1, D2 be corresponding balance-non-equilibrium signal driver element respectively;
The CS audio video synchronization is separated and the clamper unit;
ADC vision signal digitisation processing unit;
C1 intelligence phase place and gain compensation Operations Analysis;
M1 low-and high-frequency phase place and gain compensation unit;
The indication of R1 state and function setting unit;
The external coupling capacitance of CAP;
The external reference voltage source of REF;
The CHIP receiving chip refers to all circuit units that comprise in the dotted line.
Embodiment
With reference to figure 1, be structure calcspar of the present invention.The present invention comprises all unit in the dotted line block diagram, respectively balance-Non-equilibrium Molecular Dynamics Simulation Study vision signal input unit S1, balance vision signal amplifying unit A1, balance, non-equilibrium signal output driver element D1 and D2, audio video synchronization is separated and clamper unit CS, vision signal digitisation processing unit ADC, intelligent phase place and gain compensation Operations Analysis C1, low-and high-frequency phase place and gain compensation unit M1, state indication and function setting unit R1.
In conjunction with reference to the accompanying drawings, introduce in detail the course of work of the present invention:
Balance or non-equilibrium vision signal are respectively by in the twisted-pair feeder binding post or coaxial cable binding post access chip of integrated circuit (IC) chip outside.Behind the chip power, among outer video signal access balance-Non-equilibrium Molecular Dynamics Simulation Study vision signal access unit S1.Balance-Non-equilibrium Molecular Dynamics Simulation Study vision signal access unit S1 automatic detection signal source is if non-equilibrium vision signal then is converted into balanced signal automatically; If balanced signal then is input to balance vision signal amplifying unit A1 according to acquiescence input polarity with balanced signal.A1 is initially the maximum gain compensation, and the balance vision signal of amplifying through A1 accesses respectively balance, non-equilibrium signal output driver element D1 and D2.D1 output balance vision signal, it is required to be used for the signal relaying.The output of D2 separates and clamper unit CS and vision signal digitisation processing unit ADC through external coupling capacitance CAP access audio video synchronization.
The CS incoming video signal that will be coupled carries out clamper, and compares with input reference voltage source, and with isolated line synchronizing signal, field sync signal, burst signal are inputted intelligent phase place and gain compensation Operations Analysis C1.
C1 utilizes synchronizing signal to produce ADC conversion and control sequential, and the control ADC incoming video signal that will be coupled carries out the digitisation processing, and the result of digitisation sends into C1.
C1 at first detects the validity of synchronizing signal, starts simultaneously the built-in timer circuit.If within the regular hour, detect valid synchronization signal, show that the vision signal of access is effective; Otherwise, switch to realize input source or polarity through state indication and function setting unit R1 control S1, guarantee the correct input of vision signal.
After detecting the effective video signal, C1 utilizes the engineering experience modeling algorithm to carry out computing in conjunction with the digitisation input results.The output of operation result is used for control low-and high-frequency phase place and gain compensation unit M1 is combined into different compensating network access A1, produces a feedback loop.C1 adjusts M1 according to specific algorithm according to the output sampled result of ADC to A1, to realize the optimal compensation regulating effect.
After the compensated regulation process finished, C1 continued the monitoring valid synchronization signal.If do not detect within a certain period of time valid synchronization signal, show that video output signals changes, then turn back to initial condition and restart the self adaptation adjustment process; Otherwise, then keep existing parametric compensation network, continue the validity of monitoring synchronizing signal.
Whole adjustment process is finished according to incoming video signal automatically by chip, realizes best regulating effect.Owing to need not manual intervention, regulation output result's consistency is guaranteed automatically.Peripheral circuit of the present invention is simple, can be used to design the adaptive video receiving equipment, the adaptive video trunking, and the embedded receive path of digital VTR, and other video receptions are used.
Above-mentioned preferred embodiments only is used for illustrating the present invention; be not to limit protection scope of the present invention; any within the spirit and principles in the present invention scope, any modification of doing, equivalence replacement, improvement etc. all should be included within the scope of the present invention.
Claims (6)
1. adaptive equalization-non-equilibrium bimodulus video reception chip is characterized in that, comprising:
Balance-non-equilibrium vision signal input unit is used for balance-non-equilibrium signal access, and detects and the input polarity control signal according to the signal source, and output balance vision signal is to balance vision signal amplifying unit;
Balance vision signal amplifying unit in conjunction with the input of low-and high-frequency phase place and gain compensation unit, carries out phase place and gain compensation to the input balanced signal;
Balance-non-equilibrium signal driver element, reception comes the output signal of self-balancing vision signal amplifying unit, selects outputting standard balance or non-equilibrium vision signal according to external pin;
Audio video synchronization is separated and the clamper unit, the non-equilibrium signal output of balance-non-equilibrium signal driver element is inputted with the coupling of chip external capacitor, and input signal is carried out clamper separate with synchronizing signal;
Vision signal digitisation processing unit is inputted the non-equilibrium signal output of balance-non-equilibrium signal driver element with the coupling of chip external capacitor, and according to the sequencing control of intelligent phase place and gain compensation Operations Analysis input signal is carried out digitisation and process;
Intelligence phase place and gain compensation Operations Analysis, input according to audio video synchronization separation and clamper unit and vision signal digitisation processing unit, utilize the intelligent phase gain backoff algorithm of modeling to calculate phase place and gain loss, Output rusults control low-and high-frequency phase place and gain compensation unit, Indirect method balance vision signal amplifying unit;
Low-and high-frequency phase place and gain compensation unit, by different electric capacity and the resistor networks of output generation of intelligent phase place and gain compensation Operations Analysis, access balance vision signal amplifying unit;
State indication and function setting unit provide digital state indication pin and serial function setting and fetch interface, in order to indicate the chip operation state and to provide interface are set.
2. a kind of adaptive equalization as claimed in claim 1-non-equilibrium bimodulus video reception chip is characterized in that, described balance-non-equilibrium vision signal input unit specifically comprises:
Signal comes power sense circuit and the non-equilibrium balancing circuitry that turns, be the non-equilibrium signal input if detect, then transfer it to balanced signal by the non-equilibrium balancing circuitry that turns, both support the balance vision signal of the input take unshielded twisted pair as carrier, also supported the non-equilibrium vision signal take coaxial cable as carrier;
One group of analog switching circuit by the balanced signal of switching over output correct polarity, is realized balanced signal polarity self adaptation, and Practical Project need not to distinguish balanced signal polarity in installing.
3. a kind of adaptive equalization as claimed in claim 1-non-equilibrium bimodulus video reception chip is characterized in that, described balance vision signal amplifying unit specifically comprises:
The adjustable video amplifier circuit of gain, its feedback control loop comes from resistance and the capacitance network of low-and high-frequency phase place and gain compensation unit structure, by changing the parameter of resistance and capacitance network, adjusts video amplifier circuit to the compensation of phase place and gain.
4. a kind of adaptive equalization as claimed in claim 1-non-equilibrium bimodulus video reception chip is characterized in that described balance-non-equilibrium signal driver element specifically comprises:
A balanced signal drive circuit and a non-equilibrium signal drive circuit enable by external terminal or register setting, both have been used for the output balanced signal and also have been used for the output non-equilibrium signal.
5. a kind of adaptive equalization as claimed in claim 1-non-equilibrium bimodulus video reception chip is characterized in that, described audio video synchronization is separated and the clamper unit specifically comprises:
The video clamp circuit is clamped to preset level with incoming video signal, separates in order to finish synchronizing signal;
Sync separator circuit extracts the synchronizing signal in the vision signal after the clamper, and transfers digital signal to and export intelligent phase place and gain compensation Operations Analysis to.
6. a kind of adaptive equalization as claimed in claim 1-non-equilibrium bimodulus video reception chip is characterized in that described low-and high-frequency phase place and gain compensation unit specifically comprise:
One group of analog switch, the circuit network that the electric capacity of different value and resistance consist of, by the state of control simulation switch, the electric capacity that conversion is different and the network of resistance are linked into balance vision signal amplifying unit and adjust its compensating parameter.
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| CN 200910189533 CN102075724B (en) | 2009-11-25 | 2009-11-25 | Adaptive balanced and non-balanced dual mode video receiving chip |
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| CN 200910189533 CN102075724B (en) | 2009-11-25 | 2009-11-25 | Adaptive balanced and non-balanced dual mode video receiving chip |
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| CN102075724A CN102075724A (en) | 2011-05-25 |
| CN102075724B true CN102075724B (en) | 2013-02-20 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6075563A (en) * | 1996-06-14 | 2000-06-13 | Konica Corporation | Electronic camera capable of adjusting color tone under different light sources |
| JP2001007880A (en) * | 1999-05-10 | 2001-01-12 | Trw Inc | Orthogonal channelizer in digital demodulator |
| CN1404697A (en) * | 2000-08-29 | 2003-03-19 | 皇家菲利浦电子有限公司 | System and method for dynamic adaptive decoding of scalable video to balance CPU load |
| CN1767652A (en) * | 2005-11-08 | 2006-05-03 | 上海广电（集团）有限公司中央研究院 | Self-adaptive associated controlling method for coding speed and video quality in bit rate switchover |
| CN101193316A (en) * | 2006-11-21 | 2008-06-04 | 安凯（广州）软件技术有限公司 | A self-adapted white balance correction method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6075563A (en) * | 1996-06-14 | 2000-06-13 | Konica Corporation | Electronic camera capable of adjusting color tone under different light sources |
| JP2001007880A (en) * | 1999-05-10 | 2001-01-12 | Trw Inc | Orthogonal channelizer in digital demodulator |
| CN1404697A (en) * | 2000-08-29 | 2003-03-19 | 皇家菲利浦电子有限公司 | System and method for dynamic adaptive decoding of scalable video to balance CPU load |
| CN1767652A (en) * | 2005-11-08 | 2006-05-03 | 上海广电（集团）有限公司中央研究院 | Self-adaptive associated controlling method for coding speed and video quality in bit rate switchover |
| CN101193316A (en) * | 2006-11-21 | 2008-06-04 | 安凯（广州）软件技术有限公司 | A self-adapted white balance correction method |
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