CN2613763Y - Video exciting device for digital oscilloscope - Google Patents
Video exciting device for digital oscilloscope Download PDFInfo
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- CN2613763Y CN2613763Y CN 03250492 CN03250492U CN2613763Y CN 2613763 Y CN2613763 Y CN 2613763Y CN 03250492 CN03250492 CN 03250492 CN 03250492 U CN03250492 U CN 03250492U CN 2613763 Y CN2613763 Y CN 2613763Y
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Abstract
The utility model discloses a video trigger equipment for digital oscilloscope comprising a video polarity selector, a gain amplifier, a traveling field demultiplexer, and also a peak detector, a pedestal generator and a pedestal comparator which are successively connected in series and form a feedback control loop. The device of the utility model is capable of making the integral trigger equipment adapt the change of input signal amplitude automatically, thereby supplying more stable trigger signals.
Description
Technical field
The utility model relates to oscillographic flip flop equipment, in particular for the video triggered equipment of digital storage oscilloscope.
Background technology
Most of digital oscilloscopes in the market all have video to trigger function, and this makes that utilizing digital oscilloscope to observe vision signal becomes possibility.The video triggered equipment that some digital oscilloscopes adopt generally includes high pass, low-pass filter and signal comparator, after vision signal described high pass of process and low-pass filter leach clutter, detect signals such as row, field system chronizing impulse by comparer and give the CPLD (CPLD) of digital oscilloscope to obtain digitized vision signal storage or to show.In order to obtain the digital video signal of better quality, video in the digital oscilloscope triggers the amplitude stabilization that special circuit all requires trigger pip usually, this signal amplitude is usually in hundreds of MV magnitudes, the too high or too low triggering instability that all can cause digital oscilloscope of the amplitude of described trigger pip, even can't trigger, this will cause storing or the degradation of the video signal that shows, make the ease for use of digital oscilloscope can not satisfy the requirement of ordinary skill.For above-mentioned video triggered equipment, owing to there is not the signal amplitude control assembly, when the video amplitude of input changes, the amplitude of the trigger pip of being exported also is unsettled, therefore adopt above-mentioned video triggered equipment will cause the triggering instability of digital oscilloscope, make storage or the digital video signal that shows second-rate.
Also have the video triggered equipment of some digital oscilloscopes to adopt video alternative pack signal, gain amplifier parts and row, field signal separator member to form, such video triggered equipment is same owing to there is not the signal amplitude control assembly, also can't make the amplitude stabilization of the trigger pip of output, therefore also be difficult to obtain quality digital video signal preferably.
The utility model content
The purpose of this utility model is, provides a kind of trigger pip amplitude stabilization degree higher video triggered equipment, and this device can adapt to the variation of input signal amplitude automatically, thereby the trigger pip of amplitude stabilization is provided.
For achieving the above object, the video triggered equipment that is used for digital oscilloscope that the utility model provides comprises: video polarity selector, gain amplifier and row field signal separation vessel that the order polyphone connects, also comprise peak detector, reference level generator and level comparator, wherein:
Peak detector, detect the video peak signal from the vision signal of being obtained, its input end connects the output terminal of gain amplifier, to obtain the vision signal of gain amplifier output, its output terminal connects the first input end of level comparator, gives level comparator with described peak signal;
Reference level generator provides the fiduciary level that compares with described peak signal signal, and its output terminal connects second input end of described level generator;
Level comparator, its output terminal connects the feedback input end of described gain amplifier, be used for more described peak signal and fiduciary level signal, the signal difference that relatively obtains is outputed to described gain amplifier, control described gain amplifier and when the amplitude of described vision signal is higher than the fiduciary level signal, reduce gain amplifier, when the amplitude of described vision signal is lower than the fiduciary level signal, improve gain amplifier.
Described device also comprises error amplifier, is connected between the input end of the output terminal of level comparator and gain amplifier, is used for the difference signal of amplification level comparer output, changes with effective ride gain Amplifier Gain.
Described device further comprises:
Wave filter, this wave filter are connected between described error amplifier and the described gain amplifier, are used for leaching the noise signal of described error amplifier output signal.
Time adjusting device, be connected between described error amplifier and the described wave filter, perhaps be connected between described wave filter and the described gain amplifier, be used to adjust the phase place of the video error signal of giving described gain amplifier, adapt with phase place with vision signal.
Can adopt incorporate filtering and time adjusting device in above-mentioned wave filter and the time adjusting device reality, this filtering and time adjusting device are connected between described error amplifier and the described gain amplifier, are used for leaching the noise signal of described error amplifier output signal and adapt with the phase place of vision signal.
Described device also comprises buffering driver, be connected between described gain amplifier and the row field signal separation vessel, with buffering and drive the vision signal of described gain amplifier output, the vision signal that guarantees to be input to the row field signal separation vessel satisfies the demand of row field signal separation vessel input signal.
Above-mentioned peak detector is a diode peak detector.
The said reference level generator is a stabilivolt.
Video polarity selector, gain amplifier and row field signal separation vessel that the order polyphone connects, also comprise peak detector, reference level generator and level comparator, wherein, the input end of peak detector connects the output terminal of gain amplifier, the signal of peak detector and reference level generator output all incoming level comparer compares, and difference relatively inputs to gain amplifier through the output terminal of level comparator.
Described device also comprises wave filter, and described wave filter connects the output terminal of level comparator and the input end of gain amplifier.
Described device also comprises time adjusting device, adjusts the response time coefficient of control loop, to follow the tracks of the variation of input.
Described device also comprises filtering and time adjusting device.
Described device also comprises error amplifier, connects the output terminal of level comparator and the input end of gain amplifier, is used for when the comparison difference of level comparator is less when being not enough to trigger gain amplifier.
Described device also comprises buffering driver, with the signal that guarantees gain amplifier input end line of input field signal separation vessel reposefully.
Described peak detector is a diode peak detector.
Described reference level generator is a stabilivolt.
Since the utility model be included as that gain amplifier makes up by peak detector, reference level generator and level comparator are the main feedback circuit of forming, control described gain amplifier and when the amplitude of described vision signal is higher than the fiduciary level signal, reduce gain amplifier, when being lower than the fiduciary level signal, the amplitude of described vision signal improves gain amplifier, thereby make whole flip flop equipment can adapt to the variation of input signal amplitude automatically, thereby provide amplitude more stable trigger pip.
Description of drawings
Figure 1 shows that embodiment block scheme of the present utility model;
Figure 2 shows that circuit diagram embodiment illustrated in fig. 1;
Fig. 3 is the application principle figure of the described embodiment of Fig. 1.
Embodiment
Introduce video triggered equipment of the present invention in detail below in conjunction with the drawings and specific embodiments.
Video triggered equipment as shown in Figure 1 comprises video polarity selector 1, gain amplifier 2, buffering driver 3 and row field signal separation vessel 4 that the order polyphone connects; Described video polarity selector 1 is used for selecting according to the test needs of reality the vision signal of required polarity, described gain amplifier 2 is used for vision signal is amplified, described buffering driver 3, be used to cushion and drive the vision signal of described gain amplifier 2 outputs, the vision signal that assurance is input to row field signal separation vessel 4 has enough amplitudes and power, to satisfy the demand of row field signal separation vessel 4 input signals.In addition, video triggered equipment shown in Figure 1 also comprises peak detector 5, reference level generator 6 and level comparator 7, wherein:
Filtering and time adjusting device 9, be connected between described error amplifier 8 and the described gain amplifier 2, be used for leaching the noise signal of described error amplifier 8 output signals and the time coefficient that adjustment feeds back to the error signal of described gain amplifier 2, so that the phase place of the phase place of described error signal and vision signal adapts, thus the effective change in gain of ride gain amplifier 2.
Above-mentioned peak detector 5, reference level generator 6, level comparator 7 and filtering and time adjusting device 9 are formed a feedback control loop with serial arrangement.For this feedback control loop, the input end of peak detector 5 connects the output terminal of buffering driver 3, and the output terminal of reference level generator 6 and peak detector 5 all is connected to the input end of level comparator 7.Like this; from the vision signal of buffering driver 3 after peak detector 5 carries out detection; usually can obtain the peak value of the bigger vision signal of changes in amplitude; in the application of reality; the amplitude of vision signal is normally unsettled; and the unsettled vision signal of amplitude can make the row of row field signal separation vessel 4 outputs, the degradation of field signal, thereby is difficult to obtain order of accuarcy higher numeral row, field signal.Therefore, if the amplitude of vision signal is higher than normal value, be the reference level of the standard amplitude that produces greater than reference level generator 6 of the video peak signal of peak detector 5 output, on the contrary the reference level that produces less than reference level generator 6 of the video peak signal of peak detector 5 outputs then.With greater than the time be example, peak detector 5 inputs to level comparator 7 with the video peak signal that detects, level comparator 7 compares this signal and reference level value, obtain the less difference signal of some amplitudes, the signal amplitude of this moment may be very little, so that the effectively gain of ride gain amplifier 2.For making its purpose that is able to effective ride gain amplifier 2, the error amplifier 8 that connects at the output terminal of level comparator 7 amplifies the difference signal more by a small margin of these level comparator 7 outputs.Because the detection process of above-mentioned vision signal, comparison procedure, amplification process etc. may cause the delay of error signal and the generation of noise signal, so, before this signal is inputed to gain amplifier 2, filtering and time adjusting device 9 between the two, have been connected, adjust with response time coefficient and damping characteristic the The whole control loop, make total system adapt, thereby obtain preferable feedback effects with the variation of vision signal phase place and amplitude.So, vision signal has just experienced a degenerative process, and the gain of gain amplifier 2 is improved, and desired normal value is got back in output.
If the reference level that the output of peak detector 5 produces less than reference level generator 6, control procedure is opposite with said process, carries out positive feedback, and the gain of gain amplifier 2 is reduced, and desired normal value is got back in output.
The amplitude of said process dynamic following input signal is automatically carried out, and the output of ride gain amplifier 2 is stable.
Figure 2 shows that the circuit diagram that this is embodiment illustrated in fig. 1, the peak detector 5 among the figure is a diode peak detector 5 preferably.Reference level generator 6 can directly adopt a voltage stabilizing diode, also can directly adopt a constant pressure source, as dry cell, obtains constant voltage as long as can guarantee reference level comparer 7.Reference level comparer 7 i.e. an arithmetical unit, and relatively the difference signal that the changes in amplitude amplitude is less is relatively exported in the back, and error amplifier 8 receives these difference signals, and with its amplification, exports filtering and time adjusting device 91 then to.Described filtering and time adjusting device 91 are made up of resistance R 1, R2 and capacitor C 1, C2.Then, the difference signal through amplifying that receives of 91 pairs of filtering and time adjusting devices carries out filtering and adjusts time coefficient and damping characteristic.
Fig. 3 is the application principle figure of the described embodiment of Fig. 1.As shown in the figure, the input end of the video polarity selector 1 of video triggered equipment connects signal condition, impact damper, to receive this signal condition, the next signal of impact damper transmission.The output terminal of the row field signal separation vessel 4 of video triggered equipment connects CPLD, exports isolated capable signal, field signal and parity signal to CPLD.
In additional embodiments of the present utility model, described level comparator 7 and error amplifier 8 can be comparison amplifiers, the level value that is provided by the peak signal and the reference level comparer 7 of peak detector 5 output compares in this comparison amplifier and amplifies, and exports filtering and time adjusting device 9 then to.
In another embodiment of the present utility model, described filtering and time adjusting device 9 can also be a wave filter and a time adjusting device, wave filter carries out filtering to the signal of error amplifier 8 outputs, with the clutter filtering, signal with this filtering clutter inputs to time adjusting device then, this time adjusting device is adjusted the response time coefficient and the damping characteristic of The whole control loop, make total system adapt, thereby obtain preferable feedback effects with the variation of vision signal phase place and amplitude.
As everyone knows, those skilled in the art can make variations and modifications under the situation that does not break away from spirit and scope of the present utility model.Therefore, it is to explanation of the present utility model that the foregoing description is construed as, and unrestricted.
Claims (8)
1, a kind of video triggered equipment that is used for digital oscilloscope comprises video polarity selector, gain amplifier and row field signal separation vessel that the order polyphone connects, it is characterized in that: also comprise peak detector, and reference level generator and level comparator, wherein:
Peak detector, detect the video peak signal from the vision signal of being obtained, its input end connects the output terminal of gain amplifier, to obtain the vision signal of gain amplifier output, its output terminal connects the first input end of level comparator, gives level comparator with described peak signal;
Reference level generator provides the fiduciary level that compares with described peak signal signal, and its output terminal connects second input end of described level generator;
Level comparator, its output terminal connects the feedback input end of described gain amplifier, is used for more described peak signal and fiduciary level signal, and the signal difference that relatively obtains is outputed to described gain amplifier.
2, the video triggered equipment that is used for digital oscilloscope according to claim 1, it is characterized in that, described device also comprises error amplifier, is connected between the input end of the output terminal of level comparator and gain amplifier, is used for the difference signal of amplification level comparer output.
3, the video triggered equipment that is used for digital oscilloscope according to claim 2, it is characterized in that: described device also comprises wave filter, this wave filter is connected between described error amplifier and the described gain amplifier, is used for leaching the noise signal of described error amplifier output signal.
4, the video triggered equipment that is used for digital oscilloscope according to claim 3, it is characterized in that: described device also comprises time adjusting device, be connected between described error amplifier and the described wave filter, perhaps be connected between described wave filter and the described gain amplifier, be used to adjust the phase place of the video error signal of giving described gain amplifier, adapt with phase place with vision signal.
5, the video triggered equipment that is used for digital oscilloscope according to claim 2, it is characterized in that: described device also comprises filtering and time adjusting device, be connected between described error amplifier and the described gain amplifier, be used for leaching the noise signal of described error amplifier output signal and adapt with the phase place of vision signal.
6, according to claim 4 or the 5 described video triggered equipments that are used for digital oscilloscope, it is characterized in that: described device also comprises buffering driver, be connected between described gain amplifier and the row field signal separation vessel, with buffering and drive the vision signal of described gain amplifier output, the vision signal that guarantees to be input to the row field signal separation vessel satisfies the demand of row field signal separation vessel input signal.
7, the video triggered equipment that is used for digital oscilloscope according to claim 6 is characterized in that: described peak detector is a diode peak detector.
8, the video triggered equipment that is used for digital oscilloscope according to claim 7 is characterized in that: described reference level generator is a stabilivolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03250492 CN2613763Y (en) | 2003-04-24 | 2003-04-24 | Video exciting device for digital oscilloscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03250492 CN2613763Y (en) | 2003-04-24 | 2003-04-24 | Video exciting device for digital oscilloscope |
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|---|---|
| CN2613763Y true CN2613763Y (en) | 2004-04-28 |
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| CN 03250492 Expired - Lifetime CN2613763Y (en) | 2003-04-24 | 2003-04-24 | Video exciting device for digital oscilloscope |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330965C (en) * | 2005-06-24 | 2007-08-08 | 东南大学 | Oscilloscope condition triggering method based on finit state machine |
| CN101207835B (en) * | 2006-12-22 | 2010-12-01 | 康佳集团股份有限公司 | Monitor for monitoring video signal power level |
| CN102520228A (en) * | 2011-12-21 | 2012-06-27 | 王子斌 | Peak value detection method in digital storage oscilloscope and system thereof |
| CN103018513A (en) * | 2011-09-23 | 2013-04-03 | 北京普源精电科技有限公司 | Oscilloscope with video triggering function |
| CN103713172A (en) * | 2012-10-08 | 2014-04-09 | 北京普源精电科技有限公司 | Oscilloscope having improved video triggering function |
| CN106851265A (en) * | 2017-03-28 | 2017-06-13 | 深圳市九洲电器有限公司 | Multi-tuner Set Top Box produces detection method and system |
| CN110753195A (en) * | 2019-12-25 | 2020-02-04 | 深圳市鼎阳科技股份有限公司 | High-stability video triggering method and digital oscilloscope |
-
2003
- 2003-04-24 CN CN 03250492 patent/CN2613763Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330965C (en) * | 2005-06-24 | 2007-08-08 | 东南大学 | Oscilloscope condition triggering method based on finit state machine |
| CN101207835B (en) * | 2006-12-22 | 2010-12-01 | 康佳集团股份有限公司 | Monitor for monitoring video signal power level |
| CN103018513A (en) * | 2011-09-23 | 2013-04-03 | 北京普源精电科技有限公司 | Oscilloscope with video triggering function |
| CN102520228A (en) * | 2011-12-21 | 2012-06-27 | 王子斌 | Peak value detection method in digital storage oscilloscope and system thereof |
| CN103713172A (en) * | 2012-10-08 | 2014-04-09 | 北京普源精电科技有限公司 | Oscilloscope having improved video triggering function |
| CN103713172B (en) * | 2012-10-08 | 2017-08-25 | 北京普源精电科技有限公司 | It is a kind of that there is the oscillograph for improving video triggering function |
| CN106851265A (en) * | 2017-03-28 | 2017-06-13 | 深圳市九洲电器有限公司 | Multi-tuner Set Top Box produces detection method and system |
| CN110753195A (en) * | 2019-12-25 | 2020-02-04 | 深圳市鼎阳科技股份有限公司 | High-stability video triggering method and digital oscilloscope |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Free format text: FORMER OWNER: WANG TIEJUN WANG YUE Effective date: 20050624 Owner name: BEIJING PUYUANJING POWER SCIENCE CO., LTD. Free format text: FORMER OWNER: LI WEISEN |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20050624 Address after: 100085 Beijing city Haidian District on the four street 8 Huacheng Building 5 Patentee after: Beijing Rigol Technologies, Inc. Address before: 100085 Beijing city Haidian District on the four street 8 Huacheng Building 5 Co-patentee before: Wang Tiejun Patentee before: Li Weisen Co-patentee before: Wang Yue |
|
| C32 | Full or partial invalidation of patent right | ||
| IP01 | Partial invalidation of patent right |
Decision date of declaring invalidation: 20070926 Decision number of declaring invalidation: 10517 |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130424 Granted publication date: 20040428 |