CN101413968A - Digital oscilloscope and method for controlling display waveform - Google Patents
Digital oscilloscope and method for controlling display waveform Download PDFInfo
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- CN101413968A CN101413968A CNA2008101403362A CN200810140336A CN101413968A CN 101413968 A CN101413968 A CN 101413968A CN A2008101403362 A CNA2008101403362 A CN A2008101403362A CN 200810140336 A CN200810140336 A CN 200810140336A CN 101413968 A CN101413968 A CN 101413968A
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Abstract
The invention relates to a microprocessor or computer-based digital oscilloscope and a method for manipulating and displaying waveforms in the digital oscilloscope, the digital oscilloscope and the method are characterized in that the digital oscilloscope is provided with a bar-shaped touch device (11) for waveform selection, the coordinates of two key points on the top and the bottom part of each displayed waveform on a display screen are taken as fixation points, a touch point in the bar-shaped touch device (11) is mapped in the display screen by the linear corresponding relation to obtain a mapping position along the vertical direction, and the waveform represented by the fixation points which are most close to the mapping position is selected as the current waveform. When in waveform section, the digital oscilloscope has the advantages of faster, more intuitive and more difficult in making mistakes; the method does not need the precise positioning, the waveform selection device occupies smaller space, thereby being capable of reducing the operation range and reducing the hand fatigue; the placement of the waveform selection device is more flexible, and the waveform selection device can be moved relative to the waveform display screen.
Description
Technical field
The present invention relates to a kind of method of handling display waveform based on the digital oscilloscope of microprocessor or computing machine and in digital oscilloscope.
Background technology
Oscillograph can synchronously show several waveforms, and each waveform has been described the variation of the amplitude of a different signal with respect to the time.This oscillograph permission operator adjusts the multiple display parameter of each display waveform, such as the upright position of waveform on the oscillograph screen, and vertical displaying ratio, horizontal observation position, horizontal displaying ratio, triggering level, color, brightness, or the like.
When the disclosing solution figurate number was less, some oscillographs (such as 2 passages or 4 oscilloscope channels of current trend) provided one to overlap independently front panel knob for the display parameter commonly used (generally being the upright position of waveform on the oscillograph screen and vertical displaying ratio) of each waveform of control.This oscillograph has color display screen usually, each display waveform color difference, the front panel parameter regulation knob of each waveform correspondence is identical with corresponding waveform color, finishes adjusting with convenient front panel parameter regulation knob (as upright position adjusting knob and vertical displaying ratio adjusting knob) according to the color searching corresponding color that will regulate waveform.According to the analysis to the interface of each major company's current main-stream oscillograph product, this method becomes the de facto standards of 2 passages or 4 oscilloscope channels substantially.The shortcoming of this method is: port number was difficult for using greater than 4 o'clock; Can limit waveform details expressive force (color of each passage waveform is defined, and can produce when representing situation such as data point density with different colours at needs and obscure, and passage waveform color can produce when identical with analysis waveform or stored waveform color to be obscured); There is not " current waveform " notion.
When display waveform more for a long time, for each parameter of controlling each waveform provides one to overlap independently the front panel knob or switch is uneconomical or unpractical, so can provide one to overlap independently knob or switch for controlling each display parameter, a waveform that provides a kind of method to select to wait to regulate display parameter in addition, the waveform of selection use relatively more outstanding display mode to indicate.In case a waveform is selected, oscillograph reconfigures, and response changes the display parameter of selected waveform at the operation of any waveform display parameter control handle or button, and this moment, the parameter input equipment was simplified.All there are some shortcomings in several waveform systems of selection of current techniques, 1. in the oscillograph that has, for each passage waveform provides an independently selection key, utilize the waveform of selected this passage correspondence of selection key of each passage; Because a plurality of passage waveforms putting in order on screen is variable, so a waveform and its passage button are mapped and will spend the regular hour.2. in the oscillography instrument that has, providing independently, waveform selection knob is used for selecting adjacent waveform successively or provides one group of button (" making progress ", " downwards ") that is used for selecting successively adjacent waveform to select waveform; The shortcoming of this method is to select adjacent waveform successively, when display waveform more for a long time, move to be selected waveform (such as in screen bottom) from the waveform of current selected (such as) topmost and pass through more operation steps possibly at screen.3. also have some other oscillograph can use mouse directly clicking display waveform of selection on the data point on the display screen; This method is more directly perceived, simple operation, and shortcoming is that eyes will stare at mouse, many perpetual objects, and the mouse action object on the display screen is numerous, mouse accurately is positioned on the data point of waveform to be selected to take a little times, and causes maloperation easily.Use mouse to select waveform, general just as a kind of supplementary means, " use mouse to select waveform, use mouse to change the display parameter of the waveform of selecting then equally ".4. be called the United States Patent (USP) 4 of " Waveform selection by touch ", 766,425 and the United States Patent (USP) 4,821 of by name " Touchscreen feedback system ", 030, described by directly clicking the method for selecting a display waveform on the data point on the touch-screen.This method is more directly perceived, simple operation, shortcoming is that operation the time can cover on the part of touch and the touch-screen other touch operation object and may cause and obscure, increase touch-screen and can raise the cost, and when the waveform display screen is big, the scope of activities of operating personnel's hand also becomes greatly, and operating personnel are tired easily.
Summary of the invention
A kind of convenient oscillograph of handling display waveform that one of purpose of the present invention provides in order to overcome the unhandy shortcoming that exists in the prior art exactly; Two of purpose of the present invention just provides a kind of method of handling display waveform.
Basic ideas of the present invention are: provide the bar shaped touching device linear corresponding in vertical direction with the waveform viewing area (typically touch bar as capacitor induction type, select to touch bar to call waveform in the following text) of a special use to be used to select waveform; Calculate of the representative of the coordinate of each display waveform several Key Points (hereinafter referred to as the waveform blinkpunkt) on the display screen vertical direction as the waveform upright position; The touch point that waveform is selected to touch in the bar is mapped to the mapping position that obtains in the display screen in vertical direction by linear corresponding relation, and selecting the waveform blinkpunkt pairing waveform the most approaching with touching mapping position is current waveform.
In a typical digital oscilloscope, each waveform is presented on the oscillograph with a series of pixel, the upright position of each pixel determines that by the Wave data sequence (amplitude is with respect to the time) of periodically gathering an input signal generation the present invention calculates the representative of the blinkpunkt coordinate of its vertical direction as the waveform upright position according to each waveform data sequence.The length of the vertical dimension of waveform viewing area and waveform selection touch bar can be inequality among the present invention; In order to reduce the moving range of operator's hand, the length that general waveform selects to touch bar than the vertical dimension of waveform viewing area much smaller (the waveform length of selecting to touch bar with elbow or wrist when motionless substantially finger can touch its all parts and be as the criterion, and the resolution that touches bar wants enough.Original when just not too big when the vertical dimension of waveform viewing area, both sizes can be close or equal), waveform can be selected to touch the bar linear mapping to the waveform viewing area on the position of vertical direction.
The shape of waveform selection touch bar also can be very flexible, both can be a straight wide bar shaped touch area, also can be to be the broken line type (is reference point with the centre position) at center with the intermediate point, also can be the bar shaped of one a section circular arc or a solid.
Compared with the prior art, oscillograph of the present invention and manipulation display waveform method have faster, more directly perceived and more difficult advantage of makeing mistakes when selecting waveform.This method does not need accurate location, and the waveform selecting arrangement takes up room littler, the opereating specification of hand in the time of can reducing to carry out the waveform selection.The waveform selecting arrangement is settled more flexible, can be placed in the most maneuverable position of hand, and can move with respect to the waveform display screen.
Description of drawings:
Fig. 1 is the front view of the oscilloscope panel among the present invention;
Fig. 2 is the oscillographic hardware simplicity block diagram among the present invention;
Fig. 3 is that the waveform among the present invention is selected the touch bar state testing circuit block diagram in the touching device;
Fig. 4 is that waveform provided by the invention is selected principle schematic;
Fig. 5 is a waveform vertical histogram synoptic diagram;
Fig. 6 is the mobile application mode synoptic diagram of waveform selecting arrangement of the present invention;
Waveform option program process flow diagram when Fig. 7 is the present invention's " touch " operation;
Waveform option program process flow diagram when Fig. 8 is the present invention's " slip " touch operation;
Fig. 9 is the present invention's waveform option program process flow diagram when " pinning " touch operation motionless;
Embodiment
One, the composition of digital oscilloscope provided by the invention:
As shown in Figure 1, the invention provides a kind of front elevation view of the digital oscilloscope 1 based on microprocessor, signal input connector 18 is installed in the lower end of front panel 4, display screen 17 is installed in the left side of front panel 4, the right of display screen 17 is an operation keyboard 20, here only show and be used to illustrate three main operational zones of the present invention: waveform setting area 3, waveform shows adjusting knob district 5, waveform is selected district 7, function button and a key of fast closing " current waveform " that waveform setting area 3 comprises the setup menu of 4 waveform/waveform window commonly used can eject " passage setting " menu as the operation of button " CH1～CH8 " and be used to be provided with the Waveform switch of 8 passages, impedance, parameters such as coupling and probe coefficient.Waveform shows two adjusting knobs of two adjusting knobs comprising waveform vertical direction displaying ratio and position in the adjusting knob district 5 (the right two) and horizontal direction.Waveform selects district 7 to comprise that mainly a waveform window row switching key 9 and waveform selection touch bar 11; Press waveform window row switching key 9 can about switch between window arranged side by side and select " current window ", " current window " to adopt outstanding display mode to identify.It is that a stripe shape touches mechanism that waveform selects to touch bar 11, be used at " current window " column selection waveform, can adopt now popular capacitor induction type touching technique to realize, touch control chip as the QslideTM of QUANTUM company and just can be advantageously used in design capacitance induction type touch bar.As shown in fig. 1, can the auxiliary location positioning of carrying out of separator bar be set in the centre that waveform is selected to touch bar 11.Display screen 17 can show waveform, menu, data and other figure or the text that oscillograph produces, only show the waveform viewing area 97 that comprises 3 waveform window here, 3 waveform window are divided into two row, the waveform window 98 and the waveform window 99 on the left side are arranged side by side up and down, in the waveform window 100 on the right 4 waveforms are arranged, the housing line represents it is the current window of choosing with two-wire.Signal is analysis waveform in waveform window 98 and the waveform window 99, and 4 waveforms of signal are the passage waveforms in the waveform window 100.The touch area that waveform select to touch bar 11 is generally than waveform viewing area 97 regional little in vertical direction, when selecting to touch bar 11 selection waveforms by the touch waveform, its touch area and waveform viewing area 97 are mapped in the regional linearity of vertical direction.
Fig. 2 is the hardware block diagram of the oscillograph 1 shown in Fig. 1.One tunnel measured signal is introduced oscillograph by oscillographic input connector 18 (as the BNC socket of general purpose oscialloscope), regulate the back through the signal conditioning circuit on the oscillograph internal circuit board 30 and carry out digitizing by adc circuit 31, the data point data of adc circuit 31 outputs store acquisition memory 33 into after signal acquisition process device 32 is handled.Operate under the software control of microprocessor 34 in being stored in ROM41, RAM42 is as the storage of ephemeral data, and ROM41 and RAM42 are by bus 43 operations.
Data point data in the acquisition memory 33 have determined the display position of data point on display screen.Microprocessor 34 writes raster memory 35 by display controller 36 after with the data point data processing in the acquisition memory 33 and forms display bitmaps, and display controller 36 regularly reads display bitmap data in the raster memory 35 and delivers to display screen 17 and produce and show.Circuit 37 trigger taking place and acquisition control circuit 38 controls trigger and gather, makes the demonstration of a plurality of waveforms synchronous with the trigger point of operator's setting.Keyboard circuit 39 is responsible for the monitoring operators button, knob and waveform is selected to touch the operations of bar, and sends to microprocessor 34 behind the coding and respond.Microprocessor 34 can be the microprocessor of the Intel80X86 series of standard, or based on the microprocessor of ARM kernel; Microprocessor 34 carries out communication by interface 44 and keyboard circuit 39; Interface 44 can be interfaces such as RS232, USB or SPI, and keyboard circuit 39 comprises that also the interface of a correspondence and principal computer carry out communication; In case of necessity, microprocessor 34 also can be designed to carry out communication by wave point and keyboard circuit 39, realizes remote keypad.
The operator's that microprocessor 34 can be sent according to keyboard circuit 39 instruction executive routine, the control oscillograph carries out corresponding action.Eject the parameters such as Waveform switch, impedance, coupling and probe coefficient that " passage setting " menu is used to be provided with certain passage as operational order according to the button " CH1-CH8 " of waveform setting area 3; According to touch bar operational order select a waveform as " current waveform "; Show signal attenuation/magnification ratio of signal conditioning circuit 30 that the operational order control " current waveform " of vertical adjustment knob in the adjusting knob district 5 is corresponding or skew etc. up and down according to waveform.Notice that with respect to other waveform, the operator will adopt relatively more outstanding display mode to show by " the current waveform " that touches the bar selection or indicate, such as adopting higher waveform brightness, adopting relatively more outstanding color etc.
Fig. 6 is the mobile application mode synoptic diagram of waveform selecting arrangement of the present invention.Waveform of the present invention selects touching device to can be designed as waveform operation portable terminal 601, selects to touch bar, sweep circuit, interface circuit and other waveform control member comprising waveform.Oscillograph module 603 is connected with computing machine 602 by interface (PCI, USB, RS232 or wave point etc.), waveform operation portable terminal 601 is by interface cable or wireless communication mode and computing machine 602 communications, by procedure Selection in the hard disk of computing machine and manipulation waveform.Waveform operation portable terminal 601 and waveform wherein select to touch bar, with respect to the display 604 of the computing machine that is used for the waveform demonstration, are transportable.
By selecting a waveform, the operator tells oscillograph, as the response of the operation that waveform is shown adjusting knob etc., adjusts which waveform that is presented on the screen.As mentioned above, the oscillograph of prior art allows the waveform that the operator selects by the several different methods indication.But method of the present invention provides a system, and the operator selects touch bar 11 to tell oscillograph to select and one of them nearest display waveform of position, touch point by touching the waveform corresponding with the position linearity of waveform viewing area vertical direction.
Two, the method for manipulation display waveform provided by the invention:
1, the present invention generally adopts the C language to carry out the program composition of microprocessor 34, and typically, this procedure stores is called execution for microprocessor 34 in ROM41.
2, waveform blinkpunkt definition:
The present invention is based on such fact: with respect to the vertical resolution of the waveform viewing area 97 of display screen, the waveform number that shows on the display screen vertical direction is less relatively.Resolution such as general digital storage oscilloscope is 8bit, and the vertical resolution of the waveform viewing area 97 of display screen generally also is 8bit, i.e. 256 row pixels; And generally only show several waveforms on the screen; Oscillograph display waveform with logic waveform is more, may have about 20.So when hand touches waveform selection touch bar 11, do not need accurately to know whether in the vertical range that touches which waveform, only need know that touch location wants near apart from which waveform, just can determine to select this waveform.So the present invention considers to choose the maximal value (MAX) and the corresponding upright position of minimum value (MIN) of a waveform, or the top of waveform (TOP) upright position corresponding with the end (BASE) is as the representative of the upright position of waveform demonstration; Because these positions also are the upright position that obtains the key of watching attentively on the waveform easily usually, in order to narrate conveniently, just are called " waveform blinkpunkt " in the present invention; Touch location is near apart from which waveform blinkpunkt, just selects the waveform of this waveform blinkpunkt correspondence to be " current waveform ".
With " top " and " end " of waveform as more stable waveform blinkpunkt:
" top " of a waveform (TOP) and " end " (BASE), be histogram by the data point distribution in vertical direction of adding up a waveform, choose upper and lower two peak values/quasi-peak value point and draw.As shown in Figure 5, the data point distribution in vertical direction of the square-wave waveform 222 on the statistics left side obtains histogram 333.Histogram 333 has up and down two peak points, as arrow indication place among the figure, " top " that is waveform (TOP) with " end " (BASE).With respect to the maximal value (MAX) and minimum value (MIN) of waveform, " top " of waveform is (TOP) more stable with " end " position (BASE).For multilevel digital signal, have a plurality of peak points on the histogram of its vertical direction, can elect the waveform blinkpunkt as.For a direct current signal, its display waveform is a straight line, and " top " of waveform is very approaching (BASE) with " end " (TOP), and can get one of them as unique waveform blinkpunkt this moment.
3, touch operation detects:
Typically, can be realized the scanning of button, knob-operated in the keyboard scanning circuit 39 by single-chip microcomputer easily, waveform is selected touching device to comprise capacitor induction type touch bar and its touch control chip that manages (as the QslideTM series of QUANTUM company) is managed.As shown in Figure 3, sweep circuit 77 is a core to touch control chip, touches bar 11 and is made up of the conductive pattern on PCB surface, can detect finger near inductance capacitance; The state that touches bar 11 senses sweep circuit 77 by 3 detection line SNSA1, SNSA2, SNSA3, sweep circuit 77 will touch the state encoding of bar 11, if find the state that touches bar 11 variation has taken place, the state that then changes the CHANGE signal is notified microprocessor 34 in the mode of interrupting.Microprocessor 34 reads the status information of sweep circuit 77 detected touch bars totally by one 5 line SPI interface (comprise DRDY ,/SS, SCLK, MOSI, MISO 5 signal wires).Whether the status information of the touch bar that sweep circuit 77 provides comprises: currently touch, current touch location etc.
After the state that detects the CHANGE signal becomes effectively, microprocessor 34 is carried out the touch operation trace routine, at first judge current whether the touch, if finger has left touch bar 11, withdraw from the touch operation trace routine after then keeping a record, otherwise, write down current touch location and judge that touch manner is " touch " or " slip "." touch ", promptly operator's finger is by not touching on the bar to touching the incident that touches on the bar; " slip ", promptly original touch of operator's finger touching on the bar, still touch now touching on the bar, but variation taken place in the position.
Also having a kind of situation is " pinning motionless ".When finger touches fixed position that is touching on the bar 11 always, do not change owing to touch the state of bar, just there is not effective CHANGE signal to produce, at this moment to use and regularly interrupt detecting.Timer 45 produces an interruption every the regular hour, and this moment, microprocessor 34 just judged whether hand touches on touch bar 11 always; If be originally in touch condition, now still in touch condition, but touch location do not change, and just can assert that hand " pins motionless " on touch bar 11 always.
So the touch operation trace routine is divided into three kinds with the touch operation of hand: " touch ", " slip ", " pinning motionless ".
After detecting touch operation, just the position of touch location with the waveform that calculates blinkpunkt can be compared, touch location is near apart from which waveform blinkpunkt, just selects the waveform of this waveform blinkpunkt correspondence to be " current waveform ".Its main treatment scheme is: the touch location mapping, and waveform blinkpunkt data computation, waveform is selected.
4, the linear mapping relation of touch location on the display screen vertical direction:
General, the vertical resolution of digital oscilloscope is 8 bits, and the scope of the data of a data point after the analog to digital conversion is 0～255, and storage is exactly a plurality of 8 Bit datas of gathering data point constantly of each waveform in the acquisition memory 33.
Fig. 4 has shown 4 waveform Wfm1～Wfm4 in the waveform window 100 on display screen 17 the right among Fig. 1, supposes that waveform window 100 promptly is the waveform viewing area.Thick vertical line section 111 has been indicated the projection of waveform viewing area size in vertical direction, its pixel coordinates scope is 0～255, wherein the arrow of lower end has been indicated the bottom position of waveform viewing area projection in vertical direction, and the arrow of upper end has been indicated the tip position of waveform viewing area projection in vertical direction.
Thick vertical line section 102,104,106,108 has been indicated 4 display waveform projections in vertical direction respectively, the maximal value of the corresponding Wave data in the upper end of each projection line segment, the minimum value of the corresponding Wave data in the lower end of each line segment.Because the needs of observation, the operator may regulate the position of arbitrary waveform, so 4 waveforms might not be corresponding one by one with their sequence number (1～4) on order up and down.
Thick vertical line section 115 has indicated waveform to select to touch the length dimension of bar 11, and its resolving range is 0～63.Waveform to be selected to touch bar 11 size and waveform viewing area size linearity in vertical direction in vertical direction and be mapped, just vertical line section 115 and vertical line section 111 linearities are mapped.In the example of Fig. 4, because the coordinate scope of vertical line section 111 is 256, the coordinate scope of vertical line section 115 is 64,256 ÷ 64=4, so the coordinate Y1 of a point on the vertical line section 115 closes to the linear mapping of the coordinate Y2 of the correspondence position of vertical line section 111 is: Y2=Y1*4;
Because 4 coordinates on the corresponding vertical line section 111 of coordinate on the vertical line section 115, use following formula a coordinate on the vertical line section 115 to be corresponded to a coordinate bottom in 4 coordinates going up correspondence of vertical line section 111.According to custom, also can correspond to a coordinate on the vertical line section 115 coordinate going up the centre in 4 corresponding coordinates of vertical line section 111, at this moment the linear mapping relation is modified to: Y2=Y1*4+2;
Touch_pos＝Npos*4+2＝34*4+2＝138；
The position of arrow 113 indication among Fig. 4 just, this location definition is a mapping position.In the embodiment explanation below, just adopt this revised linear mapping method.Conversely, also any vertical base graticule of display screen waveform viewing area can be mapped to and touch on the bar 11.
5, waveform blinkpunkt Coordinate Calculation and ordering:
Waveform for acquisition channel with 8bit resolution, the calculating at its maximal value and minimum value or " top " and " end ", identical with maximal value in the voltage measurement project in the well-known digital oscilloscope with the computing method on minimum value or " top " and " end ", just need not be converted into magnitude of voltage to the value of Wave data.Obtain maximal value and minimum value or " top " and " end " as the waveform blinkpunkt after each waveform data statistics by storage in 34 pairs of acquisition memory 33 of microprocessor.
The mixed signal oscillograph that has has logical channel, for the logic waveform of 1bit (have only high and low) resolution, its Wave data have only ' 0 ' with ' 1 ' two kinds of values, but the position of the logic waveform that shows on the screen and amplitude can be regulated.Obtain maximal value and minimum value after each logic waveform data statistics by storage in 34 pairs of acquisition memory 33 of microprocessor, but have only when high or low when waveform, maximal value can equate with minimum value.Can highly directly calculate the display position of its waveform ' height ' and ' low ' as the waveform blinkpunkt according to the position and the demonstration of logic waveform.When waveform has only when high or low, the coordinate of two waveform blinkpunkts is identical, only needs to keep one.
For analysis waveforms such as FFT, its display bitmap is being write before the raster memory, its data point data generally can be carried out buffer memory in RAM42, by obtaining maximal value and minimum value after the data statistics of microprocessor 34 to all data points in its Wave data buffer memory, and calculate the coordinate of two corresponding waveform blinkpunkts.
Suppose that maximum, minimum value with the acquisition channel waveform of 4 8bit resolution among Fig. 4 are the waveform blinkpunkt, the coordinate that calculates each waveform blinkpunkt sees Table 1.
The blinkpunkt of each waveform of table 1
| The blinkpunkt sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Waveform Wfm number | 1 | 1 | 2 | 2 | 3 | 3 | 4 | 4 |
| The blinkpunkt coordinate | 15 | 62 | 164 | 182 | 192 | 240 | 78 | 126 |
Because will relatively which blinkpunkt is corresponding waveform to determine to select with touch location,, the results are shown in Table 2 after the ordering so will sort by the blinkpunkt coordinate.When the blinkpunkt coordinate that runs into a plurality of waveforms was identical, elder generation sorted with waveform Wfm number size order.Wfm number the preferential signal label that uses is assisted ordering, uses the auxiliary ordering of channel number when not having label." having selected sign " item in the table 2 is used for writing down under " pinning motionless " mode selected for which waveform, and explanation is arranged below.
Blinkpunkt after table 2 ordering
| The blinkpunkt sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Waveform Wfm number | 1 | 1 | 4 | 4 | 2 | 2 | 3 | 3 |
| The blinkpunkt coordinate | 15 | 62 | 78 | 126 | 164 | 182 | 192 | 240 |
| |
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
6, select waveform according to touch operation and waveform blinkpunkt data:
After obtaining incident that touch bar state that keyboard circuit 39 sends over changes, microprocessor 34 detects through touch manner and touch location shines upon the mapping position that obtains the touch point, and calculate and upgrade waveform blinkpunkt data, search and the nearest blinkpunkt of mapping position in the blinkpunkt data after ordering then, the waveform that it is corresponding is defined as " current waveform ".Waveform selection course of the present invention just is described below:
After the touch operation trace routine detects once effective touch operation, be " touch " according to touch operation, still " slip ", or " pinning motionless " selects waveform in different ways.
If touch operation is " touch ", by process selecting waveform shown in Figure 7.If " slip " or " pinning motionless " presses Fig. 8 and process selecting waveform shown in Figure 9.Select flow process at the waveform under these three kinds of touch operation below, provide respectively and illustrate.
Suppose that " current waveform " is Wfm1, it is " touch " that present microprocessor 34 detects a touch operation, and arrow 117 has been indicated the touch location of touch point among Fig. 4, and its coordinate is 34; The coordinate that has calculated the mapping position (in Fig. 4 position of arrow 113 indications) of touch location on the vertical direction of display screen waveform viewing area of touch point above is 138.
The blinkpunkt that search removes " current waveform " Wfm1 in table 2 (equals 1 blinkpunkt waveform Wfm number then, promptly the blinkpunkt sequence number is 1 and 2 blinkpunkt in the table 2) in addition the nearest waveform blinkpunkt in distance map position (coordinate 138), the result is that sequence number is 4 blinkpunkt distance map position nearest (138-126=12), corresponding waveform Wfm number is 4, so record ' 4 ' is " current waveform " waveform Wfm number, selecting waveform Wfm4 is " current waveform ".If this moment, hand touched the position, touch point that arrow 117 is indicated in Fig. 4 after leaving and touching bar once more, then because current Wfm4 was exactly " current waveform " originally, so can think that the operator is another waveform of wishing that selection closes on, two blinkpunkts (the blinkpunkt sequence number is 1 and 2 blinkpunkt in the table 2) that will get rid of the Wfm4 correspondence when then searching for, this moment, Search Results was that sequence number is that (164-138=26), waveform Wfm number of correspondence is 2 recently for 5 blinkpunkt distance map point mapping place.So record ' 2 ' is " current waveform " waveform Wfm number, selecting waveform Wfm2 is " current waveform ".Most of the time uses the waveform number of oscillograph observation less at ordinary times, uses waveform to select to touch the two ends and the middle separator bar auxiliary positioning thereof of bar when touch this moment, can the easily selected quickly waveform of paying close attention to.Such as showing 4 waveforms on the screen, select to touch the repeatedly touch bottom of bar at waveform, two waveforms below can the alternate selection screen; Select to touch the repeatedly touch of the top of bar at waveform, two waveforms that can be above the alternate selection screen.So the present invention also is applicable to 2 passages and 4 oscilloscope channels that port number is less, accomplish that the oscillographic operation keyboard of different port numbers is general.
No matter which former " current waveform " be, when microprocessor 34 detected a touch operation and is " slip ", the waveform of all can the chosen distance mapping position nearest blinkpunkt correspondence was new " current waveform "." current waveform " before supposing to slide is Wfm4, and the position, touch point before sliding is 34, and the position, touch point after " slip " is 39.The projected position coordinate of new position, touch point 39 mapping position on the vertical direction of display screen waveform viewing area in back of sliding is 39*4+2=158; By the nearest blinkpunkt of table 2 detection range mapping position coordinate 158, obtain coordinate 164, sequence number is 5, corresponding waveform Wfm number is 2, promptly sets Wfm2 and is " current waveform ".If continue " slip " to a new position, touch point 46, the new mapping position coordinate of position, touch point 46 on the vertical direction of display screen waveform viewing area in back that slide is 46*4+2=186; By the nearest blinkpunkt of table 2 detection range mapping position coordinate 186, obtain coordinate 182, sequence number is 6, corresponding waveform Wfm number still is 2, promptly still sets Wfm2 and is " current waveform ".
When microprocessor 34 detects a touch operation and is " pinning motionless ", as shown in Figure 8, select to remove the waveform of the nearest waveform blinkpunkt correspondence in distance map position blinkpunkt of " having selected waveform " correspondence.If the waveform that some upright positions, waveform viewing area crossover shows is more, just can select near these waveforms of mapping position successively by the mode of " pinning motionless ".After selecting a waveform, just in " having selected sign " shown in the table 2 item, use ' 1 ' all blinkpunkts all to be designated " selecting " with this waveform.
When hand leaves the touch bar or slides, will use 10 ' note point all to be designated " choosing " in " having selected sign " shown in the table 2 item with all waveforms.So, waveform when " touch " shown in Figure 7 is selected in the flow process, " current waveform " also can unify to be " having selected waveform ", but having only " current waveform " is " having selected waveform ", so also just need not use ' 1 ' all blinkpunkts with this waveform all to be designated " selecting " in " having selected sign " shown in the table 2 item.
Except using special display mode to indicate " current waveform ", can indicate the mapping position of the position and/or the current touch point of current blinkpunkt at the vertical edge of waveform viewing area with sign, as "＜" symbol in the indication frame 110 among Fig. 4, indicated the blinkpunkt of current blinkpunkt: Wfm4 upper end, " " symbol in the indication frame 110 has been indicated the mapping position (coordinate of arrow 113 indications is 138 position) of current touch point.Indication frame 110 is placed on the right hand edge of " current window " row.Because the maximal value of movable waveform and minimum value or " top " may be in continuous variations with " end ", so will calculate the data of upgrading the waveform blinkpunkt when selecting waveform except the touch that waveform select is touched bar because of the operator, regularly (or when waveform display update) calculates the data of upgrading the waveform blinkpunkt, upgrades the sign of current blinkpunkt position simultaneously.
Claims (5)
1, a kind of digital oscilloscope, it comprises microprocessor, storer, keyboard circuit, waveform selecting arrangement and relevant interface circuit in forming, it is characterized in that: the waveform selecting arrangement is that a waveform of being made up of touch bar, touch control chip and interface circuit is selected touching device, this device carries out communication by interface circuit and microprocessor, the touch condition coding back that waveform selects touching device to produce is handled by microprocessor, be used for waveform and select.
2, a kind of digital oscilloscope according to claim 1, it is characterized in that: be provided with one in the keyboard circuit and select touching device, and handle by microprocessor behind the touch condition coding that touching device is produced by keyboard circuit by touching bar and touching the waveform that control chip forms.
3, the method for the used manipulation display waveform of a kind of digital oscilloscope is characterized in that having adopted following steps:
(1), add up the data point distribution in vertical direction of each display waveform, calculate each display waveform in the representative of the several Key Points of vertical direction as the position of waveform on the display screen vertical direction, be called the waveform blinkpunkt;
(2), set up the touch location of touch point in touching bar and concern with the linear mapping of this touch location in the corresponding vertical direction of display screen position, and obtain touching the mapping position of touch location in display screen in the bar;
(3), above-mentioned touch point mapping position and each waveform blinkpunkt position are compared, select the waveform corresponding to show as current waveform with the nearest waveform blinkpunkt of mapping position.
4, the method for the used manipulation display waveform of a kind of digital oscilloscope according to claim 3, it is characterized in that having adopted following steps: each waveform blinkpunkt is sorted by coordinate, select the waveform corresponding to show as current waveform with the nearest waveform blinkpunkt of touch point mapping position.
5, the method for the used manipulation display waveform of a kind of digital oscilloscope according to claim 3, it is characterized in that having adopted following steps: each waveform blinkpunkt is sorted by coordinate, select except that the blinkpunkt that selects the waveform correspondence, and the nearest pairing waveform of waveform blinkpunkt of mapping position show as current waveform.
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