CN101667412B - Signal compensation device, signal compensation method and multi-computer switching system - Google Patents
Signal compensation device, signal compensation method and multi-computer switching system Download PDFInfo
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- CN101667412B CN101667412B CN200810215014XA CN200810215014A CN101667412B CN 101667412 B CN101667412 B CN 101667412B CN 200810215014X A CN200810215014X A CN 200810215014XA CN 200810215014 A CN200810215014 A CN 200810215014A CN 101667412 B CN101667412 B CN 101667412B
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Abstract
The invention discloses a signal compensation device, a signal compensation method and a multi-computer switching system. The signal compensation device comprises a de-differential unit, a detection unit, a control unit, a filter and an equalizer. The de-differential unit outputs single-ended signals according to differential signals; the detection unit outputs detection signals according to the single-ended signals; the control unit outputs pulse width modulation signals according to the detection signals; the filter outputs direct-current signals according to the pulse width modulation signals; and the equalizer compensates for video signals according to the direct-current signals.
Description
Technical field
The present invention relates to a kind of signal compensation apparatus, and particularly relate to a kind of signal compensation apparatus, method for compensating signal and multicomputer switch system of avoiding producing smear phenomenon and too drastic phenomenon.
Background technology
Along with making rapid progress of science and technology, the vision signal of main frame output now can be passed to the display device that is in the strange land via signal transmssion line.But when vision signal is passed to display device via signal transmssion line, vision signal will cause the decay gradually of vision signal along with increasing gradually of transmission path.If do not carry out any signal compensation, then display frame will be blured and is unintelligible.On the contrary, if vision signal is exceedingly compensated, then too drastic phenomenon will appear in display frame, and reduce the serviceable life of display device.
In order to solve this problem, present compensation way is that unit compensates vision signal with per 20 meters.Yet this kind way often is subject to site environment, and can't correctly and effectively compensate.For instance, the yardstick that original compensation way is set is 10 meters, 30 meters and 50 meters, but the distance of site environment is 20 meters, does not then know to be set at 10 meters still 20 meters this moment.If directly be set in 10 meters, then display frame will produce the smear phenomenon.But if directly be set in 30 meters, but too drastic phenomenon takes place in display frame.So how a kind of correct and effective signal compensation mode is provided, be one of major subjects of endeavouring of industry.
Summary of the invention
The present invention is relevant for a kind of signal compensation apparatus, method for compensating signal and multicomputer switch system.Signal compensation apparatus, method for compensating signal and multicomputer switch system correctly and effectively compensate vision signal, to avoid producing too drastic phenomenon or smear phenomenon.
According to the present invention, a kind of signal compensation apparatus is proposed.Signal compensation apparatus comprises separates differential unit, detecting unit, control module, wave filter and balanced device.Separate differential unit and export single-ended signal according to differential wave.Detecting unit is according to the single-ended signal output detection signal.Control module is according to detection signal output pulse width modulation signal.Wave filter is exported direct current signal according to pulse width modulating signal.Balanced device compensates vision signal according to direct current signal.
According to the present invention, a kind of method for compensating signal is proposed.Method for compensating signal comprises the steps: according to differential wave output single-ended signal; According to the single-ended signal output detection signal; According to the modulation of detection signal output pulse width (Pulse Width Modulation, PWM) signal; According to pwm signal output direct current signal; And according to direct current signal compensation vision signal.
According to the present invention, a kind of multicomputer switch system is proposed, use for a near-end control end and a remote control terminal and control a plurality of main frames.Multicomputer system comprises KVM switch, remote signal extender, reaches the near end signal extender.KVM switch is electrically connected to main frame.The remote signal extender is electrically connected to remote control terminal.The near end signal extender is electrically connected to KVM switch, remote signal extender and near-end control end.Comprise more than at least one of remote signal extender and near end signal extender and separate differential unit, detecting unit, control module, wave filter and balanced device.Separate differential unit and export single-ended signal according to differential wave.Detecting unit is according to the single-ended signal output detection signal.Control module is according to detection signal output pulse width modulation signal.Wave filter is exported direct current signal according to pulse width modulating signal.Balanced device compensates vision signal according to direct current signal.Near-end control end and remote control terminal respectively comprise keyboard, mouse and display device.Balanced device compensation vision signal later can be sent to the display device of near-end control end and/or remote control terminal and show.
According to the present invention, a kind of multicomputer switch system is proposed, use for a control end and control a plurality of main frames.Multicomputer switch system comprises matrix multi-computer switch and signal extender.Matrix multi-computer switch is electrically connected to main frame.The signal extender is electrically connected to control end and matrix multi-computer switch.The signal extender comprises separates differential unit, detecting unit, control module, wave filter and balanced device.Separate differential unit and export single-ended signal according to differential wave.Detecting unit is according to the single-ended signal output detection signal.Control module is according to detection signal output pulse width modulation signal.Wave filter is exported direct current signal according to pulse width modulating signal.Balanced device compensates vision signal according to direct current signal.Control end comprises keyboard, mouse and display device.Balanced device compensation vision signal later can be sent to the display device of control end and show.
For foregoing of the present invention can be become apparent, a preferred embodiment cited below particularly, and be described with reference to the accompanying drawings as follows.
Description of drawings
Fig. 1 shows the synoptic diagram according to a kind of signal compensation apparatus of preferred embodiment of the present invention.
Fig. 2 shows the thin portion synoptic diagram of control module 120 and wave filter 130.
Fig. 3 shows the process flow diagram according to a kind of method for compensating signal of preferred embodiment of the present invention.
Fig. 4 shows the synoptic diagram of first kind of multicomputer switch system.
Fig. 5 shows the synoptic diagram of second kind of multicomputer switch system.
Fig. 6 shows the synoptic diagram of the third multicomputer switch system.
The reference numeral explanation
10: signal compensation apparatus
110: detecting unit
120: control module
122: analog-digital converter
The 124:PWM controller
126: storage element
130: wave filter
140: balanced device
150: separate differential unit
310～340: step
40,50,60: multicomputer switch system
410,510: main frame
420: KVM switch
430: remote control terminal
440: the remote signal extender
450: the near-end control end
460: the near end signal extender
520: matrix multi-computer switch
530,550: control end
540,560,570: the signal extender
S1: detection signal
The S2:PWM signal
S3: direct current signal
S4: vision signal
S11: digital signal
The PWM-Vgain:PWM gain signal
The PWM-Vcrt1:PWM control signal
Vgain: gain voltage
Vcrt1: control voltage
Embodiment
Please refer to Fig. 1, it shows the synoptic diagram according to a kind of signal compensation apparatus of preferred embodiment of the present invention.Signal compensation apparatus 10 comprises separates differential unit 150, detecting unit 110, control module 120, wave filter 130 and balanced device 140.Detecting unit 110 is electrically connected on to be separated between differential unit 150 and the control module 120, and wave filter 130 is electrically connected between control module 120 and the balanced device 140.Separate differential unit 150 and receive at least one differential wave S5 by a cable, and according to the differential wave S5 output single-ended signal S6 that is received.Cable for example is not have to cover pair twist (unshielded twisted pair, UTP) cable comprise the CAT5/5e/6/7 cable and be not limited only to this.Detecting unit 110 receives separates the single-ended signal S6 that differential unit 150 is exported, and according to the single-ended signal S6 output detection signal S1 that is received.Control module 120 receives the detection signal S1 that detecting unit 110 is exported, and exports at least one pulse-length modulation (Pulse Width Modulation, PWM) signal S2 according to the detection signal S1 that is received.Wave filter 130 receives the pwm signal S2 that control module 120 is exported, and according to the pwm signal S2 output direct current signal S3 that is received.The direct current signal S3 that balanced device 140 receiving filters 130 are exported, and according to the direct current signal S3 compensation vision signal S4 that is received.Vision signal after balanced device 140 compensation can be transferred into a display device and show.Wherein, display device for example is cathode-ray tube (CRT) (Cathode Ray Tube, CRT) screen, display panels (Liquid Crystal Display, LCD) screen, projector or any image display.
Furthermore, vision signal S4 comprises first signal of video signal, second signal of video signal and the 3rd signal of video signal, and differential wave S5 is combined by one of first signal of video signal, second signal of video signal and the 3rd signal of video signal and an electronic signal.Wherein, electronic signal for example is the standard square-wave signal of 8MHz, and above-mentioned single-ended signal can be the deamplification of standard square-wave signal after transferring to signal compensation apparatus 10 through a cable of 8MHz.Cable for example is not have to cover pair twist (unshielded twisted pair, UTP) cable comprise the CAT5/5e/6/7 cable and be not limited only to this.And first signal of video signal, second signal of video signal and the 3rd signal of video signal for example are respectively red (R), green (G) and blue (B) signal of video signal or brightness (Y), colourity (U) and aberration (V) signal of video signal.Wherein, separating differential unit 150 for example is the ADA4851-2 wave filter, and detecting unit 110 for example is the 8M detecting device, and control module 120 for example is MPC82L52AT or MPC82E52 microprocessor.Wave filter 130 for example is the ADA4851-2 wave filter, and balanced device 140 for example is an EL9112 or three quarters of an hour EL9110 balanced device, but technology of the present invention is not limited to this.
Those skilled in the art can understand that technology of the present invention is not limited thereto.For example, separate differential unit 150 and receive at least one differential wave S5 by a cable, differential wave S5 for example is that the standard square-wave signal of G signal of video signal and 8MHz combines.Separate differential unit 150 according to the differential wave S5 output single-ended signal S6 that is received, single-ended signal S6 for example is the deamplification of standard square-wave signal after transferring to signal compensation apparatus 10 through a cable of 8MHz.Detecting unit 110 receives separates the single-ended signal S6 that differential unit 150 is exported, for example be the deamplification of standard square-wave signal after transferring to signal compensation apparatus 10 of 8MHz through a cable, and according to the single-ended signal S6 output detection signal S1 that is received to control module 120.
Because first signal of video signal, second signal of video signal and the 3rd signal of video signal are simulating signal, therefore will produce signal attenuation, and cause the distortion and the distortion of signal in long Distance Transmission.Aforementioned signal compensation apparatus 10 can not only compensating signal distortion and distortion, and more can be correctly and effectively compensate vision signal S4, to avoid producing too drastic phenomenon or smear phenomenon.
Please refer to Fig. 2, it shows the thin portion synoptic diagram of control module 120 and wave filter 130.Aforementioned control module 120 for example is microcontroller (Microprocessor, MCU), Application Specific Integrated Circuit (Application Specific Integrated Circuit, ASIC), complexity programmable logic element (Complex programmable Logic Device, CPLD), an effect type programmable gate array (Field programmable Gates Array, FPGA), programmable element or non-programmable element, and control module 120 also comprises analog-digital converter 122, PWM controller 124 and storage element 126.Analog-digital converter 122 converting sensed signals S1 export PWM controller 124 to for digital signal S11.PWM controller 124 is exported the pwm signal S2 that earlier figures 1 shows according to digital signal S11 and look-up table, and adjusts the work period (Duty Cycle) of pwm signal S2.Wherein, look-up table can be stored in storage element 126, or directly is stored in PWM controller 124 and omission storage element 126.In addition, PWM controller 124 also can be exported the pwm signal S2 that earlier figures 1 shows according to digital signal S11 and a quadratic function equation, and adjusts the work period of pwm signal S2.Perhaps, PWM controller 124 also can be according to digital signal S11 and one the pwm signal S2 that shows of functional equation output earlier figures 1 repeatedly, and adjusts the work period of pwm signal S2.Perhaps, PWM controller 124 also can be exported the pwm signal S2 that earlier figures 1 shows according to digital signal S11 and a nonlinear function equation, and adjusts the work period of pwm signal S2.Perhaps, PWM controller 124 also can be exported the pwm signal S2 that earlier figures 1 shows according to digital signal S11 and a Linear Functional Equations formula, and adjusts the work period of pwm signal S2.Must be noted that control module 120 performed functions also can be finished by the combination of firmware, hardware or firmware and hardware.
Pwm signal S2 comprises PWM gain signal PWM-Vgain and pwm control signal PWM-Vcrt1.PWM controller 124 is adjusted the work period of PWM gain signal PWM-Vgain and pwm control signal PWM-Vcrt1 according to digital signal S11 and look-up table.Wherein, the different digital signal S11 and corresponding PWM gain signal PWM-Vgain and reflection (Mapping) relation table of pwm control signal PWM-Vcrt1 of look-up table record.
Because the compensation way of aforementioned gain and frequency range is equivalent to linear or nonlinear mode, elasticity and comprehensive comparatively, therefore not needing is that unit carries out the staged segmented compensation to vision signal S4 with per 20 meters again.Signal compensation apparatus 10 by above-mentioned disclosure can preferably progress greatly to one meter of an every increase or an English Foot can both do accurately compensation to vision signal S4.
Please also refer to Fig. 1 and Fig. 3, Fig. 3 shows the process flow diagram according to a kind of method for compensating signal of preferred embodiment of the present invention.Method for compensating signal can be applicable to aforesaid signal compensation apparatus 10.Method for compensating signal comprises the steps: at least that at first shown in step 310, detecting unit 110 is according to single-ended signal S6 output detection signal S1.And then shown in step 320, control module 120 is according to detection signal S1 output pwm signal S2.Then shown in step 330, according to pwm signal S2 output direct current signal S3.Shown in step 340, balanced device 140 is according to direct current signal S3 compensation vision signal S4 at last.
Aforementioned signal compensation apparatus can be arranged in the signal extender, makes the signal extender suitably compensate the gain or the frequency range of vision signal according to the length scale of signal transmssion line.Aftermentioned will be the example explanation with two kinds of different multicomputer switch systems further.Please refer to Fig. 4, it shows the synoptic diagram of first kind of multicomputer switch system.Multicomputer switch system 40 usefulness are controlled a plurality of main frames 410 for a near-end control end 450 and a remote control terminal 430, and multicomputer switch system 40 comprises KVM switch 420, remote signal extender 440 and near end signal extender 460.Remote control terminal 430 and near-end control end 450 for example comprise keyboard, mouse and display device respectively.KVM switch 420 is electrically connected to main frame 410, and remote signal extender 440 is electrically connected to remote control terminal 430.Near end signal extender 460 is electrically connected to KVM switch 420, remote signal extender 440 and near-end control end 450.Aforementioned signal compensation apparatus 10 (as shown in Figure 1) can be arranged near end signal extender 460 and remote signal extender 440 further the two one of at least above in, make near end signal extender 460 correctly and effectively compensate vision signal according to the length of signal transmssion line.That is to say that remote signal extender 440 and near end signal extender 460 comprise the element and the function thereof of signal compensation apparatus 10 (as shown in Figure 1).Near-end control end 450 and remote control terminal 430 respectively comprise keyboard, mouse and display device.Balanced device compensation vision signal later can be sent to the display device of near-end control end 450 and/or remote control terminal 430 and show.Wherein, near end signal extender 460 is electrically connected with remote signal extender 440 and KVM switch 420 by a cable respectively, and cable for example is not have to cover the pair twist cable, comprises the CAT5/5e/6/7 cable and is not limited only to this.
Please refer to Fig. 5, it shows the synoptic diagram of second kind of multicomputer switch system.Multicomputer switch system 50 usefulness are controlled a plurality of main frames 510 for control end 530 and 550, and multicomputer switch system 50 comprises matrix multi-computer switch 520, control end 530, signal extender 540, control end 550 and signal extender 560.Control end 530 and control end 550 for example comprise keyboard, mouse and display device respectively.Control end 530 and control end 550 are electrically connected to signal extender 540 and signal extender 560 respectively, and signal extender 540 and signal extender 560 are electrically connected to matrix multi-computer switch 520 respectively.Matrix multi-computer switch 520 is electrically connected to main frame 510.Aforementioned signal compensation apparatus 10 (as shown in Figure 1) can be arranged in signal extender 560 and the signal extender 540 further, makes signal extender 560 and signal extender 540 correctly and effectively compensate vision signal according to the length of signal transmssion line.That is to say, the element that signal extender 560 and signal extender 540 comprise signal compensation apparatus 10 (as shown in Figure 1) with and function.Wherein, signal extender 540 and 560 is electrically connected with matrix multi-computer switch 520 by a cable respectively.Cable for example is not have to cover the pair twist cable, comprises the CAT5/5e/6/7 cable and is not limited only to this.
Please also refer to Fig. 5 and Fig. 6, Fig. 6 shows the synoptic diagram of the third multicomputer switch system.Multicomputer switch system 60 is with multicomputer switch system 50 differences: multicomputer switch system 60 also comprises signal extender 570, respectively is arranged between each main frame 510 and the matrix multi-computer switch 520.Signal extender 570 in order to a keyboard and mouse conversion of signals between a differential grouping and a digital form, to be transmitted between main frame 510 and the matrix multi-computer switch 520.Signal extender 570 can be converted to digital form by differential block form with the keyboard and mouse signal of matrix multi-computer switch 520 outputs and export main frame 510 to.Perhaps, signal extender 570 can be converted to the digital differential block form by digital form with the keyboard and mouse signal of main frame 510 outputs and export matrix multi-computer switch 520 to.Perhaps, the vision signal that main frame 510 is exported is converted to differential form by analog form and exports matrix multi-computer switch 520 to.Thus, even if the signal form of main frame 510 and matrix multi-computer switch 520 outputs is different, also can suitably changes and reach the purpose that main frame 510 and matrix multi-computer switch 520 are communicated with each other by signal extender 570.Wherein, signal extender 570 is electrically connected with matrix multi-computer switch 520 by a cable respectively.Cable for example is not have to cover the pair twist cable, comprises the CAT5/5e/6/7 cable and is not limited only to this.
Signal compensation apparatus, method for compensating signal and multicomputer switch system that the above embodiment of the present invention is disclosed compensate the gain and the frequency range of vision signal to be equivalent to linear mode.So every increase can both accurately compensate vision signal for one meter, and smear phenomenon or too drastic phenomenon can not take place.
In sum, though the present invention discloses as above with a preferred embodiment, it is not in order to limit the present invention.Those skilled in the art, under the premise without departing from the spirit and scope of the present invention, when doing some changes and modification.Therefore, protection scope of the present invention should be as the criterion with claim of the present invention.
Claims (20)
1. signal compensation apparatus comprises:
One separates differential unit, in order to export a single-ended signal according to a differential wave;
One detecting unit is in order to export a detection signal according to this single-ended signal;
One control module is in order to export at least one pulse width modulating signal according to this detection signal;
One wave filter is in order to export a direct current signal according to this pulse width modulating signal; And
One balanced device is in order to compensate a vision signal according to this direct current signal.
2. signal compensation apparatus as claimed in claim 1, wherein this control module comprises:
One analog-digital converter is a digital signal in order to change this detection signal; And
One Pwm controller is in order to export this pulse width modulating signal according to this digital signal.
3. signal compensation apparatus as claimed in claim 2, wherein this Pwm controller is adjusted a work period of this pulse width modulating signal according to this digital signal.
4. signal compensation apparatus as claimed in claim 2, wherein this Pwm controller is exported this pulse width modulating signal according to this digital signal and a look-up table.
5. signal compensation apparatus as claimed in claim 2, wherein this Pwm controller is exported this pulse width modulating signal according to this digital signal and a quadratic function equation.
6. method for compensating signal comprises:
(a) export a single-ended signal according to a differential wave;
(b) export a detection signal according to this single-ended signal;
(c) export at least one pulse width modulating signal according to this detection signal;
(d) export a direct current signal according to this pulse width modulating signal; And
(e) compensate a vision signal according to this direct current signal.
7. method for compensating signal as claimed in claim 6, wherein this step (c) comprising:
(c-1) changing this detection signal is a digital signal; And
(c-2) export this pulse width modulating signal according to this digital signal.
8. method for compensating signal as claimed in claim 7, wherein this step (c-2) is exported this pulse width modulating signal according to this digital signal and a look-up table.
9. method for compensating signal as claimed in claim 8, wherein this step (c-2) is adjusted a work period of this pulse width modulating signal according to this digital signal and this look-up table.
10. method for compensating signal as claimed in claim 7, wherein this step (c-2) is exported this pulse width modulating signal according to this digital signal and a quadratic function equation.
11. a multicomputer switch system is used for a remote control terminal and a near-end control end and controlled a plurality of main frames, this multicomputer switch system comprises:
One KVM switch is electrically connected to described main frame;
One remote signal extender is electrically connected to this remote control terminal; And
One near end signal extender is electrically connected to this KVM switch, this remote signal extender and this near-end control end, and this near end signal extender or this remote signal extender comprise a signal compensation apparatus, and this signal compensation apparatus also comprises:
One separates differential unit, in order to export a single-ended signal according to a differential wave;
One detecting unit is in order to export a detection signal according to this single-ended signal;
One control module is in order to export at least one pulse width modulating signal according to this detection signal;
One wave filter is in order to export a direct current signal according to this pulse width modulating signal; And
One balanced device is in order to compensate a vision signal according to this direct current signal.
12. multicomputer switch system as claimed in claim 11, wherein this control module comprises:
One analog-digital converter is a digital signal in order to change this detection signal; And
One Pwm controller is in order to export this pulse width modulating signal according to this digital signal.
13. multicomputer switch system as claimed in claim 12, wherein this Pwm controller is adjusted a work period of this pulse width modulating signal according to this digital signal.
14. multicomputer switch system as claimed in claim 12, wherein this Pwm controller is exported this pulse width modulating signal according to this digital signal and a look-up table.
15. multicomputer switch system as claimed in claim 12, wherein this Pwm controller is exported this pulse width modulating signal according to this digital signal and a quadratic function equation.
16. a multicomputer switch system is used for a control end and is controlled a plurality of main frames, should
Multicomputer switch system comprises:
One matrix multi-computer switch is electrically connected to described main frame; And
One first signal extender is electrically connected to this control end and this matrix multi-computer switch, and this signal extender comprises:
One separates differential unit, in order to export a single-ended signal according to a differential wave;
One detecting unit is in order to export a detection signal according to this single-ended signal;
One control module is in order to export a pulse width modulating signal according to this detection signal;
One wave filter is in order to export a direct current signal according to this pulse width modulating signal; And
One balanced device is in order to compensate a vision signal according to this direct current signal.
17. multicomputer switch system as claimed in claim 16, wherein this control module comprises:
One analog-digital converter is a digital signal in order to change this detection signal; And
One Pwm controller is in order to export this pulse width modulating signal according to this digital signal.
18. multicomputer switch system as claimed in claim 17, wherein this Pwm controller is adjusted a work period of this pulse width modulating signal according to this digital signal.
19. multicomputer switch system as claimed in claim 17, wherein this Pwm controller is exported this pulse width modulating signal according to this digital signal and a look-up table.
20. multicomputer switch system as claimed in claim 17, wherein this Pwm controller is exported this pulse width modulating signal according to this digital signal and a quadratic function equation.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1169073A (en) * | 1996-04-18 | 1997-12-31 | 松下通信工业株式会社 | Receiver |
| CN101175194A (en) * | 2007-10-25 | 2008-05-07 | 深圳市优特普科技有限公司 | Automatic calibration composite video signal cable transmission equipment |
| CN101262558A (en) * | 2007-03-07 | 2008-09-10 | 宏正自动科技股份有限公司 | Method and system for transmitting video signals |
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2008
- 2008-09-02 CN CN200810215014XA patent/CN101667412B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1169073A (en) * | 1996-04-18 | 1997-12-31 | 松下通信工业株式会社 | Receiver |
| CN101262558A (en) * | 2007-03-07 | 2008-09-10 | 宏正自动科技股份有限公司 | Method and system for transmitting video signals |
| CN101175194A (en) * | 2007-10-25 | 2008-05-07 | 深圳市优特普科技有限公司 | Automatic calibration composite video signal cable transmission equipment |
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