CN103675380B - A kind of oscillograph with cycle Trigger Function - Google Patents
A kind of oscillograph with cycle Trigger Function Download PDFInfo
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- CN103675380B CN103675380B CN201210362469.0A CN201210362469A CN103675380B CN 103675380 B CN103675380 B CN 103675380B CN 201210362469 A CN201210362469 A CN 201210362469A CN 103675380 B CN103675380 B CN 103675380B
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Abstract
The invention provides a kind of oscillograph with cycle Trigger Function, including：Data sampling unit, for carrying out digital sample to measured signal according to sampling clock, obtain sampled data；Digital comparing unit, compare processing for entering line level to sampled data, produce comparison signal；Samples storage unit, for being stored according to trigger signal to sampled data, produce waveform display data；Trigger control unit, for using sampling clock, the periodic quantity of local signal in measured signal to be obtained by comparison signal；And by periodic quantity compared with preset threshold range, trigger signal is produced according to comparative result.The present invention can be obtained the periodic quantity of local signal in measured signal by comparison signal, when the periodic quantity meets certain condition, performance period triggers, because periodic quantity obtains from digitized comparison signal, therefore, the present invention is to make use of the mode of numeral, realizes cycle triggering.
Description
Technical field
The present invention relates to test field of measuring technique, more particularly to a kind of oscillograph with cycle Trigger Function.
Background technology
Oscillograph is a kind of quite varied electronic measuring instrument of purposes, and it can be converted into electric signal invisible to the human eye
The visible waveform image of human eye, it is easy to people to study the change procedure of various electric signals.Traditional analog oscilloscope is using simulation
Circuit（Oscilloscope tube）, its electron gun forms electron beam to screen emissions electronics, the electronics line focus of transmitting, and gets to inner surface painting
Have on the screen of fluorescent material, the point that such electron beam hits will send light, so as to depict wavy curve.Stored digital is shown
Ripple device（Digital Storage oscilloscopes, DSO）, abbreviation digital oscilloscope, it is tested by analog-digital converter
Amount signal is converted to digital information and stored, and using the data reconstruction waveform signal stored and on the screen of oscillograph
Shown.
Triggering is one of Core Feature of oscillograph, so-called triggering, refers to set certain trigger condition as desired.When
When waveform in measured signal meets the trigger condition, oscillograph captures the waveform and its corresponding part immediately, and is shown in
On screen.Has there is digital triggering in current digital oscilloscope, i.e. the processing of trigger signal and the extension of triggering mode
It can be completed by numerical portion.
For example, Chinese patent CN 200710089788.8 " digital trigger circuit ", discloses a kind of digital trigger
100, the digital trigger 100 can be used for digital oscilloscope.Reference picture 1, the data sampling unit 101 of digital trigger 100 are right
Measured signal a carries out data sampling, obtains digitized sampled data b；Digital comparing unit 102 is by sampled data b compared with
Level is compared, and obtains comparison signal c；The triggering type that trigger control unit 103 is set according to user is entered to comparison signal c
Row logical process, trigger signal d is produced when recognizing trigger event；Further, the samples storage unit of digital oscilloscope can
To be stored according to trigger signal d to sampled data b, waveform display data is produced, so that waveform display unit carries out waveform
Display.
In general, trigger control unit 103 can be used for the logical process for realizing a variety of triggering types, and triggering type can be
Edging trigger, pulsewidth triggering, slope triggering etc..If edging trigger, then in the rising edge and/or trailing edge of comparison signal
Produce a trigger signal；If pulsewidth triggers, then it is in the positive pulsewidth of comparison signal or negative pulsewidth in default pulse duration range
When produce a trigger signal；If slope triggers, then meet in the positive slope time of comparison signal or negative slope time default
A trigger signal is produced during time range.Existing triggering type has a variety of, and here is omitted, still, existing triggering side
In formula, not according to the cycle of measured signal, to realize the technology of triggering.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of oscillograph with cycle Trigger Function, can be according to quilt
The cycle of signal is surveyed, to realize triggering.
In order to solve the above problems, the invention discloses a kind of oscillograph with cycle Trigger Function, including：
Data sampling unit, for carrying out digital sample to measured signal according to a sampling clock, obtain sampled data；
Digital comparing unit, compare processing for entering line level to the sampled data, produce comparison signal；
Trigger control unit, for according to the comparison signal, producing trigger signal；
Samples storage unit, for being stored according to the trigger signal to the sampled data, produce for waveform
The waveform display data of display；
The trigger control unit, for utilizing the sampling clock, the measured signal is obtained by the comparison signal
In local signal periodic quantity；And by acquired periodic quantity compared with a preset threshold range, according to comparative result
Produce the trigger signal.
The present invention can be obtained the periodic quantity of the local signal in the measured signal by the comparison signal, and then with presetting
Threshold range is compared, and produces the trigger signal, that is, triggering performance period when the periodic quantity meets certain condition,
Because periodic quantity obtains from digitized comparison signal, therefore, the present invention is to make use of the mode of numeral, realizes week
Phase triggers.
As one for example, in the present invention, the trigger control unit is used to, according to the sampling clock, obtain
Very first time interval in the comparison signal between two neighboring rising edge, as the office in acquired measured signal
The period 1 value of portion's signal；And by acquired period 1 value compared with the preset threshold range, according to comparing
As a result the trigger signal is produced.
As one for example, in the present invention, the trigger control unit is used to, according to the sampling clock, obtain
Very first time interval in the comparison signal between two neighboring rising edge, as the office in acquired measured signal
The period 1 value of portion's signal；According to the sampling clock, in the comparison signal between two neighboring trailing edge is obtained
Two time intervals, as the second week time value of the local signal in acquired measured signal；And by acquired first
Periodic quantity and second week time value compared with the preset threshold range, produce the triggering according to comparative result and believed respectively
Number.
In the present invention, can be merely with the very first time interval between two neighboring rising edge in comparison signal, by it
Periodic quantity triggering performance period as measured signal；Second in comparison signal between two neighboring trailing edge can also be utilized
Time interval, as periodic quantity triggering performance period of measured signal；Can also will the very first time interval and the second time
The periodic quantity as the local signal in table measured signal a is spaced, utilizes above-mentioned two time interval triggering performance period.Week
The phase judgment mode of triggering has a variety of, can be configured according to the different demands of user.
As an example, in this illustration, the trigger control unit includes：
Rising edge triggers generation unit, for obtaining two neighboring rising in the comparison signal according to the sampling clock
Very first time interval between, it is worth as the period 1 of the local signal in acquired measured signal；And by institute
Period 1 value is stated compared with preset threshold range, when the period 1, value was in the preset threshold range, production
Raw first start pulse signal；
Trailing edge triggers generation unit, for obtaining two neighboring decline in the comparison signal according to the sampling clock
The second time interval between, as the second week time value of the local signal in acquired measured signal；And by institute
Second week time value is stated compared with preset threshold range, when the second week time value is in the preset threshold range, production
Raw second start pulse signal；
First trigger signal generation unit, for selecting first start pulse signal and second trigger pulse to believe
One in number, exported as trigger signal.
As another example, in this illustration, the trigger control unit includes：
Rising edge triggers generation unit, for obtaining two neighboring rising in the comparison signal according to the sampling clock
Very first time interval between, it is worth as the period 1 of the local signal in acquired measured signal；And by institute
Period 1 value is stated compared with preset threshold range, when the period 1, value was in the preset threshold range, production
Raw first start pulse signal；
Trailing edge triggers generation unit, for obtaining two neighboring decline in the comparison signal according to the sampling clock
The second time interval between, as the second week time value of the local signal in acquired measured signal；And by institute
Second week time value is stated compared with preset threshold range, when the second week time value is in the preset threshold range, production
Raw second start pulse signal；
Second trigger signal generation unit, for first start pulse signal and second start pulse signal
Logic or processing are carried out, logic or the result of processing are exported as trigger signal.
As one embodiment, in this example, the trailing edge triggering generation unit carries out anti-to the comparison signal
Phase processor, obtain an anti-phase comparison signal；And obtained according to the sampling clock two neighboring in the anti-phase comparison signal
Time interval between rising edge, obtain the second time interval between two neighboring trailing edge in the comparison signal.
As one embodiment, in this example, the rising edge triggering generation unit includes：
Period 1 handles subelement, is sampling clock week for producing a pulsewidth in the rising edge of the comparison signal
The positive pulse of phase, obtain first pulse signal for including at least two positive pulses；
Period 1 count sub-element, it is two neighboring in first pulse signal for being calculated according to the sampling clock
The time interval of positive pulse, the very first time interval is obtained, be worth as the period 1 and export；
Period 1 comparing subunit, for by the period 1 value compared with preset threshold range, when described
When period 1 value is in preset threshold range, the rising edge of the latter positive pulse in the two neighboring positive pulse, produce
First start pulse signal.
As another embodiment, in this example, the period 1 count sub-element includes：
First number accumulator, for when first pulse signal is low level, to the data of the sampling clock
Change frequency is added up, when it is high level that first pulse signal is by low transition, using accumulation result as first
Count value exports, and accumulation result is reset resetted afterwards；
Very first time acquisition module, for the cycle according to sampling clock, first count value is converted to described the
One time interval, it is worth as the period 1 and exports.
As one embodiment, in this example, the trailing edge triggering generation unit includes：
Anti-phase processing subelement, for carrying out anti-phase processing to the comparison signal, obtain the anti-phase comparison signal；
Second round handles subelement, for when the rising edge of the anti-phase comparison signal produces a pulsewidth to sample
The positive pulse in clock cycle, obtain second pulse signal for including at least two positive pulses；
Second round count sub-element, it is two neighboring in second pulse signal for being calculated according to the sampling clock
The time interval of positive pulse, second time interval is obtained, exported as the second week time value；
Second round comparing subunit, for by the second week time value compared with preset threshold range, when described
When second week time value is in preset threshold range, the rising edge of the latter positive pulse in the two neighboring positive pulse, produce
Second start pulse signal.
As another embodiment, in this example, the second round count sub-element includes：
Second number accumulator, for when second pulse signal is low level, to the data of the sampling clock
Change frequency is added up, when it is high level that second pulse signal is by low transition, using accumulation result as second
Count value exports, and accumulation result is reset resetted afterwards；
Second time-obtaining module, for the cycle according to sampling clock, second count value is converted to described the
Two time intervals, exported as the second week time value.
As one for example, in the present invention, the oscillograph also includes：
User input interface, for setting cycle comparison pattern and at least one Ct value time；
The trigger control unit was additionally operable to according to set Ct value time and selected cycle comparison pattern
Generate the preset threshold range.
As another for example, in the present invention, the data sampling unit is used for respectively to the quilt of multiple passages
Survey signal and carry out digital sample, obtain corresponding multi-channel sampling data；The digital comparing unit is used for respectively to the multichannel
Sampled data enters line level and compares processing, produces corresponding multichannel and compares result, and compares result from the multichannel
The comparison signal that middle selection wherein exports as the data comparing unit all the way.
Brief description of the drawings
Fig. 1 is a kind of structural representation of digital trigger for digital oscilloscope disclosed in prior art；
Fig. 2 is a kind of structural representation of the oscillograph embodiment with cycle Trigger Function of the present invention；
Fig. 3（a）It is the structural representation of an example of trigger control unit；
Fig. 3（b）It is the structural representation of another example of trigger control unit；
Fig. 3（c）It is the structural representation of another example of trigger control unit；
Fig. 4 is the structural representation of an illustration of rising edge triggering generation unit；
Fig. 5 is a kind of signal sequence schematic diagram in oscillograph embodiment of the present invention；
Fig. 6 is the structural representation of an illustration of trailing edge triggering generation unit；
Fig. 7 is the time diagram of another signal in oscillograph embodiment of the present invention.
Embodiment
In order to illustrate a kind of oscillograph with cycle Trigger Function of the present invention, below in conjunction with the accompanying drawings and specific embodiment party
The present invention is further detailed explanation for formula.
Reference picture 2, a kind of structural representation of the oscillograph embodiment with cycle Trigger Function of the present invention is shown, this
The oscillograph 200 that embodiment proposes, including：
Data sampling unit 201, it carries out digital sample to measured signal a according to a sampling clock f, obtains hits
According to b；
Digital comparing unit 202, it enters line level to sampled data b and compares processing, produces comparison signal c；
Trigger control unit 203, it utilizes sampling clock f, and the local signal in measured signal a is obtained by comparison signal c
Periodic quantity；And by acquired periodic quantity compared with a preset threshold range, trigger signal is produced according to comparative result
d；
Samples storage unit 204, it is stored according to trigger signal d to sampled data b, produces what is shown for waveform
Waveform display data e.
Measured signal a described in the present embodiment is inputted into data sampling unit 201 by the passage of oscillograph 200, data
Sampling unit 201 includes an analog-digital converter ADC, and it is entered according to sampling clock f with certain sample rate to measured signal a
The conversion of row analog to digital, realizes data sampling；Afterwards, obtained sampled data b is sent to samples storage unit 204
In.In general, an analog front circuit is also had before data sampling unit 201, for realizing to the inclined of measured signal a
Transposition is whole, gain control and bandwidth limitation etc. a series of function, make measured signal a conditioning be suitable amplitude range, with
For the reception of data sampling unit 201.The specific implementation of analog front circuit can use a variety of designs, herein not superfluous
State.
As one for example, in embodiments of the present invention, data sampling unit 201 can also be respectively to multiple passages
Multichannel measured signal a carry out digital sample, obtain corresponding multi-channel sampling data b；Digital comparing unit 202 is respectively to described
Multi-channel sampling data b enters line level and compares processing, produces corresponding multichannel and compares result, and compares processing from the multichannel
As a result the comparison signal c that middle selection wherein exports as data comparing unit 201 all the way.That is, for DLT
The oscillograph 200 in road, data sampling unit 201 can include multiple ADC, and the measured signal to different passages respectively is adopted
Sample；Accordingly, digital comparing unit 202 can include multiple digital comparing subunits, produce phase by multi-channel sampling data respectively
The multichannel comparative result answered, digital comparing unit 202 can also include a channel to channel adapter, the number for selection cycle triggering
According to source, i.e. trigger port, selection will with corresponding to trigger port all the way compared with result inputted as comparison signal c to triggering
In control unit 203.
As one for example, in embodiments of the present invention, digital comparing unit 202 can be by viscous comparator structure
Into viscous comparator can be that 8bit compares precision, and user can set comparative level and viscous scope, be made an uproar to reduce signal
The influence that vocal cords come.Two physics comparative levels can be obtained after comparative level and viscous range combinations, referred to as upper level is with
Level.If the sampled data b of viscous comparator input（8bit）More than upper level, then viscous comparator output logical one
（1bit）；If the sampled data b of input is less than lower level, viscous comparator exports logical zero（1bit）, it can be seen that
Comparison signal c is the low and high level signal being made up of data " 1 " and data " 0 ".With reference to Fig. 5, it can be seen that the quilt of sinusoidal waveform
After survey signal a compares processing by sampling and level, the ratio with low and high level being made up of data " 1 " and data " 0 " is obtained
Compared with signal c, comparison signal c to during data " 1 " saltus step, comparison signal c rising edge is formed by data " 0 "；Comparison signal c is by counting
When arriving data " 0 " saltus step according to " 1 ", comparison signal c trailing edge is formed.Such as Fig. 5, in comparison signal c, x indicates rising edge
Position, y indicates the position of trailing edge.
Trigger control unit 203 can be made up of FPGA, and it is according to the triggering type and trigger condition of setting, to comparison signal
C performs the triggering logical process such as triggering judgement, decoding, for example, performing, pulsewidth calculates, edge is adjudicated or various protocol-decodings
（As RS232, SPI, CAN are decoded）Deng, when judging to meet trigger condition, generation trigger signal d, for samples storage unit
204 couples of sampled data b are stored.When user selection triggering type triggered for the cycle when, trigger control unit 203 will by than
Compared with local signal in measured signal a acquired in signal c periodic quantity compared with a preset threshold range, according to comparing
As a result trigger signal d is produced.
Measured signal a can be cyclical signal, can also make non-periodic signals.For cyclical signal, local letter
Number for measured signal a a cycle signal, the periodic quantity all same of its each section of local signal.With reference to Fig. 5, measured signal a
For a periodic sinusoidal signal, the local signal of the signal can be the signal between point w1 to point w3, this section of local signal
Periodic quantity be point w1 to point w3 between time；Local signal in measured signal a can also be between point w2 to point w4
Signal, the periodic quantity of this section of local signal is the time between point w2 to point w4.For non-periodic signals, each section of office
The periodic quantity of portion's signal may be identical, it is also possible to and it is different, because the periodic quantity of local signal in measured signal a is by comparison signal
Acquired in c, therefore, measured signal a one section of local letter is corresponded between the position of the two neighboring rising edges of comparison signal c
Number, or measured signal a one section of local signal is corresponded between the position of the two neighboring trailing edges of comparison signal c.With reference to Fig. 7,
Measured signal a is a non-periodic signals, and in comparison signal c, x indicates the position of rising edge, and y indicates the position of trailing edge
Put.Corresponding between the position of the two neighboring rising edges of comparison signal c, measured signal a one section of local signal can be point z1
Signal between point z3, the periodic quantity of this section of local signal are the time between point z1 to point z3；Measured signal a's is another
Section local signal can be signal between point z3 to point z5, between the periodic quantity as point z3 to point z5 of this section of local signal
Time.Corresponding between the position of the two neighboring trailing edges of comparison signal c, measured signal a one section of local signal can be a little
Signal between z2 to point z4, the periodic quantity of this section of local signal are the time between point z2 to point z4；Measured signal a's is another
One section of local signal can be the signal between point z4 to point z6, and the periodic quantity of this section of local signal is between point z4 to point z6
Time.
It should be noted that measured signal a may not be strict smooth waveform signal, in Fig. 7, indicated by v
Wave regions, it has certain burr, and this section of burr may also have certain periodicity, but measured signal a part
The periodic quantity of signal does not imply that the cycle of this section of burr, and the edge placement of measured signal a local signal and comparison signal c has
Close, because comparison signal c edge placement is determined by entering comparative level when line level compares processing, therefore local signal
Periodic quantity is relevant with the comparative level set by user.In Fig. 5 and Fig. 7, with two comparative levels, i.e., upper level and lower electricity
It is flat, exemplified by illustrate.For the level comparison process with a comparative level, can mutually refer to.Numeral is more single
The level of member 202 compares content of the processing for prior art, and here is omitted.
Reference picture 2, trigger control unit 203 obtain each section of measured signal a local signal, are utilized respectively each section successively
The periodic quantity of local signal carries out triggering judgement.In embodiments of the present invention, can be obtained by comparison signal c in measured signal a
Local signal periodic quantity, and then compared with preset threshold range, trigger signal d is produced according to comparative result, that is,
When the periodic quantity meets certain condition, performance period triggers, because periodic quantity obtains from digitized comparison signal c,
Therefore, the present invention is to make use of the mode of numeral, realizes cycle triggering.
As one for example, in embodiments of the present invention, the oscillograph 200 can also include user's input and connect
Mouthful, it sets cycle comparison pattern and at least one Ct value time, in general, at most sets two Ct value times；
The cycle comparison pattern is：More than a cycle threshold time, less than a cycle threshold time, less than a cycle threshold value
Time or more than another Ct value time or more than a cycle threshold time and when being less than another Ct value
Between；Then trigger control unit 203 generates institute according to the cycle comparison pattern selected by set Ct value time and user
State preset threshold range, it can be seen that one or two Ct value times set by user, can be predetermined threshold value model
The endpoint value enclosed.It is understood that foregoing trigger port, triggering type, comparative level and viscous scope, Ye Shiyou
What the user input interface was set.
As one for example, in embodiments of the present invention, trigger control unit 203 can obtain according to sampling clock f
The very first time interval between two neighboring rising edge in comparison signal c is taken, as the office in acquired measured signal a
The period 1 value of portion's signal；And by acquired period 1 value compared with preset threshold range, according to comparative result
Produce trigger signal d.In this illustration, the very first time interval in comparison signal c between two neighboring rising edge is corresponding
The a cycle value of local signal in measured signal a, i.e. period 1 are worth, merely with first between two neighboring rising edge
Time interval carries out triggering judgement, when the very first time, interval was in the preset threshold range, then judges to meet that the cycle triggers
Condition, produce trigger signal d.
In the example above explanation, the very first time interval in comparison signal c between two neighboring rising edge can be utilized,
As periodic quantity triggering performance period of measured signal a local signal, due to entering merely with comparison signal c rising edge
Row triggering differentiates, therefore implementation method is simple.
As another for example, in embodiments of the present invention, trigger control unit 203 can according to sampling clock f,
The second time interval between two neighboring trailing edge in comparison signal c is obtained, as in acquired measured signal a
The second week time value of local signal；And by acquired second week time value compared with preset threshold range, tied according to comparing
Fruit produces trigger signal d.In this illustration, the second time interval generation in comparison signal c between two neighboring trailing edge
The a cycle value of local signal in table measured signal a, i.e. second week time value, merely between two neighboring trailing edge
Second time interval carries out triggering judgement, when the second time interval is in the preset threshold range, then judges to meet the cycle
Trigger condition, produce trigger signal d.
In the example above explanation, the second time interval in comparison signal c between two neighboring trailing edge can be utilized,
As periodic quantity triggering performance period of measured signal a local signal, due to entering merely with comparison signal c trailing edge
Row triggering differentiates, therefore implementation method is simple.
As another for example, in embodiments of the present invention, trigger control unit 203 obtains according to sampling clock f
Very first time interval in comparison signal c between two neighboring rising edge, as the part in acquired measured signal a
The period 1 value of signal；Meanwhile also obtain second in comparison signal c between two neighboring trailing edge according to sampling clock f
Time interval, as the second week time value of the local signal in acquired measured signal a；And by acquired first week
Compared with preset threshold range, the trigger signal d is produced according to comparative result respectively for time value and second week time value.At this
In illustration, the very first time interval and the second time interval can represent the periodic quantity of the local signal in measured signal a,
Triggering judgement is carried out using above-mentioned two time interval.
The example above explanation in, can will the very first time interval and the second time interval be used as table measured signal a in
Local signal periodic quantity, can both utilize the triggering interval performance period very first time, the second time interval can be utilized again
Performance period triggers, and triggering mode is versatile and flexible.
As an example, in the example above explanation, such as Fig. 3（a）Shown, trigger control unit 203 can include：
Rising edge triggers generation unit 301, its according to sampling clock f obtain in comparison signal c two neighboring rising edge it
Between very first time interval, as the local signal in acquired measured signal a period 1 be worth；And by first week
Time value, when the period 1, value was in the preset threshold range, produces one first and touched compared with preset threshold range
Send out pulse signal i；
Trailing edge triggers generation unit 302, its according to sampling clock f obtain in comparison signal c two neighboring trailing edge it
Between the second time interval, as the second week time value of the local signal in acquired measured signal a；And by second week
Time value is compared with preset threshold range, when second week time value is in the preset threshold range, produces one second and touches
Send out pulse signal j；
First trigger signal generation unit 303, it is selected in the first start pulse signal i and the second start pulse signal j
One, as trigger signal d export.
Periodic quantity can be the very first time interval between two neighboring rising edge in comparison signal c, such as t1 institutes table in Fig. 5
The second time interval in the time span or comparison signal c shown between two neighboring trailing edge, such as t2 in Fig. 5
Represented time span, therefore when realizing signal period triggering, it is necessary to which two sets of same trigger mechanisms, a set of according to rising
It is another set of according to trailing edge calculating cycle value along calculating cycle value.In this example, user can be selected by user input interface
Select according between two neighboring rising edge the very first time interval, also according between the second time between two neighboring trailing edge
Every carrying out triggering judgement, equivalent to one selecting switch of the first trigger signal generation unit 303, when user is selected according to adjacent two
Very first time interval between individual rising edge carries out triggering when judging, and the first trigger signal generation unit 303 selection first triggers
Pulse signal i is as trigger signal d；When user selects to be triggered according to the second time interval between two neighboring trailing edge
During judgement, the first trigger signal generation unit 303 selects the second start pulse signal j as trigger signal d.
As another example, in the example above explanation, such as Fig. 3（b）Shown, trigger control unit 203 can include：
Rising edge triggers generation unit 301, its according to sampling clock f obtain in comparison signal c two neighboring rising edge it
Between very first time interval, as the local signal in acquired measured signal a period 1 be worth；And by first week
Time value, when the period 1, value was in the preset threshold range, produces one first and touched compared with preset threshold range
Send out pulse signal i；
Trailing edge triggers generation unit 302, its according to sampling clock f obtain in comparison signal c two neighboring trailing edge it
Between the second time interval, as the second week time value of the local signal in acquired measured signal a；And by second week
Time value is compared with preset threshold range, when second week time value is in the preset threshold range, produces one second and touches
Send out pulse signal j；
Second trigger signal generation unit 304, it is carried out to the first start pulse signal i and the second start pulse signal j
Logic or processing, logic or the result of processing are exported as trigger signal d.
With reference to Fig. 5, in this example, logic or place are carried out to the first start pulse signal i and the second start pulse signal j
The result s of reason, logic or processing is in time sequencing, not only including the first start pulse signal i but also including the second trigger pulse
Signal j signal, using logic or the result s of processing as trigger signal d, then can ensure to carry out completely comparison signal c
Judge, triggering judgement can be both carried out according to the very first time interval between two neighboring rising edge, and generation includes the first triggering
Pulse signal i trigger signal, meanwhile, it can carry out triggering according to the second time interval between two neighboring trailing edge again and sentence
It is disconnected, produce the trigger signal for including the second start pulse signal j.
As another example, in the example above explanation, such as Fig. 3（c）Shown, trigger control unit 203 can include：
Rising edge triggering generation unit 301, trailing edge triggering generation unit 302, the first trigger signal generation unit 303 and the second triggering
Signal generation unit 304.In this example, trigger control unit 203 can both utilize the first trigger signal generation unit 303,
One in the first start pulse signal i and the second start pulse signal j is selected, is exported as trigger signal d；It can utilize again
Second trigger signal generation unit 304, logic or processing are carried out to the first start pulse signal i and the second start pulse signal j,
Logic or the result of processing are exported as trigger signal d.It is understood that the first trigger signal generation unit 303 and
Two trigger signal generation units 304 can only have one to be operated in synchronization.
As a modification, in above three example, trailing edge triggering generation unit 302 can be first to comparison signal c
Anti-phase processing is carried out, obtains an anti-phase comparison signal g；Afterwards again according to adjacent in the anti-phase comparison signal g of sampling clock f acquisitions
Time interval between two rising edges, obtain the second time interval between two neighboring trailing edge in comparison signal c.Also
It is to say, can be to comparing letter when the second time interval between two neighboring trailing edge according to comparison signal c is triggered
Number progress is anti-phase, now, similar with the principle of rising edge triggering generation unit 301, by calculating between two neighboring rising edge
Time interval obtain the periodic quantity of the local signal in measured signal a.
As another modification, in above three example, as shown in figure 4, rising edge triggering generation unit 301 includes：
Period 1 handles subelement 401, and it receives comparison signal c, and produces an arteries and veins in comparison signal c rising edge
The positive pulse of a width of sampling clock cycle, obtain a first pulse signal k for including at least two positive pulses；
Period 1 count sub-element 402, it calculates two neighboring positive arteries and veins in the first pulse signal k according to sampling clock f
The time interval of punching, very first time interval is obtained, exported as period 1 value t1；
Period 1 comparing subunit 403, its will period 1 value t1 compared with preset threshold range, when first week
When time value t1 is in preset threshold range, the rising edge of the latter positive pulse in the two neighboring positive pulse, first is produced
Start pulse signal i.
With reference to Fig. 5, the course of work that generation unit 301 is triggered to rising edge is specifically described.Can be with from Fig. 5
Find out, it is sampling clock cycle that period 1 processing subelement 401 produces pulsewidth at comparison signal c each leading edge position
Positive pulse p1 and positive pulse p2, obtain including positive pulse p1 and positive pulse p2 the first pulse signal k.It should be noted that
Comparison signal c may have multiple rising edges, and accordingly, the first pulse signal k has multiple positive pulses, herein only with two just
Pulse is as signal.Period 1 count sub-element 402 according to sampling clock f calculate the first pulse signal k in it is two neighboring just
Time interval between pulse p1 and p2.
As an example, in above-mentioned modification, as shown in figure 4, period 1 count sub-element 402 includes：
First number accumulator 404, it is according to the enable signal that a perseverance caused by trigger control unit 203 is high level
U, when the first pulse signal k is low level, sampling clock f data variation number is added up, in the first pulse signal k
When by low transition being high level, exported accumulation result as the first count value m, accumulation result is reset resetted afterwards；
Very first time acquisition module 405, in its cycle according to sampling clock f, the first count value m is converted into the very first time
Interval, exported as period 1 value t1.
With reference to Fig. 5, first number accumulator 404 is when the first pulse signal k is low level, to sampling clock f data
Change frequency is added up, and by the end of the first pulse signal k high level, sampling clock f data variation number is 9, then defeated
Go out the first count value m for 9.Assuming that in this example, sampling clock f cycle is 1ns, then very first time acquisition module 405 will be adopted
Sample clock f cycle is multiplied by the first count value m, you can obtained for the first pulse signal k low level duration, is 9ns.From figure
In 5 as can be seen that according to positive pulse p1 and positive pulse p2 rising edge, the time interval of the two is accurately calculated, it should be first
The pulse signal k low level duration, therefore, the very first time interval of obtaining of conversion should plus the pulsewidth of positive pulse
For：First count value m* sampling clocks f cycle+positive pulse p pulsewidth, is 10ns.Using the value as period 1 value t1, with
Preset threshold range is compared, and in this example, period 1 value t1 is in preset threshold range, then in two neighboring positive arteries and veins
The latter positive pulse p2 rushed in p1 and p2 rising edge produces the first start pulse signal i.In this illustration, during sampling
Clock f is synchronous with comparison signal c, the first pulse signal k, the first start pulse signal i.
It should be noted that period 1 count sub-element 402 can only will be low level lasting in the first pulse signal k
Time, as the time interval of two neighboring positive pulse, also as period 1 value t1；Then period 1 comparing subunit 403
Preset threshold range is first subtracted to sampling clock f cycle, then period 1 value t1 and the sampling clock f cycles will be subtracted
Preset threshold range be compared, equally can according to comparative result produce the first start pulse signal i.
As another modification, in above three example, as shown in fig. 6, trailing edge triggering generation unit 302 includes：
Anti-phase processing subelement 604, it carries out anti-phase processing to comparison signal c, obtains anti-phase comparison signal g；
Second round handles subelement 601, and it is sampling clock that it produces a pulsewidth in anti-phase comparison signal g rising edge
The positive pulse in cycle, obtain a second pulse signal r for including at least two positive pulses；
Second round count sub-element 602, it calculates two neighboring positive arteries and veins in the second pulse signal r according to sampling clock f
The time interval of punching, the second time interval is obtained, exported as second week time value t2；
Second round comparing subunit 603, second week time value t2 compared with preset threshold range, is worked as second week by it
When time value t2 is in preset threshold range, the rising edge of the latter positive pulse in the two neighboring positive pulse, second is produced
Start pulse signal j.
With reference to Fig. 5, the course of work that generation unit 302 is triggered to trailing edge is specifically described.Can be with from Fig. 5
Find out, the low and high level and comparison signal c for the anti-phase comparison signal g that anti-phase processing subelement 604 obtains are on the contrary, at second round
Reason subelement 601 produces the positive pulse q1 that pulsewidth is sampling clock cycle at anti-phase comparison signal g each leading edge position
With positive pulse q2, obtain including positive pulse q1 and positive pulse q2 the second pulse signal r.Equally, the second pulse signal r can have
There are multiple positive pulses, be only used as signal using two positive pulses herein.Second round count sub-element 602 is counted according to sampling clock f
Calculate the time interval between two neighboring positive pulse q1 and q2 in the second pulse signal r.
As an example, in above-mentioned modification, as shown in fig. 6, second round count sub-element 602 includes：
Second number accumulator 605, it, according to the enable signal u that a perseverance is high level, is low in the second pulse signal r
During level, sampling clock f data variation number is added up, by low transition is high level in the second pulse signal r
When, exported accumulation result as the second count value n, accumulation result is reset resetted afterwards；
Second time-obtaining module 606, in its cycle according to sampling clock f, the second count value n was converted into for the second time
Interval, exported as second week time value t2.
With reference to Fig. 5, the calculating of the time interval between the time interval between positive pulse q1 and q2, with positive pulse p1 and p2
Method is similar, and here is omitted, can refer to the calculating side of the time interval of two neighboring positive pulse in the first pulse signal k
Method.Afterwards, using the time interval between positive pulse q1 and q2 as second week time value t2, compared with preset threshold range,
In this example, second week time value t2 is in preset threshold range, then the latter in two neighboring positive pulse q1 and q2 is being just
Pulse q2 rising edge produces the second start pulse signal j.It should be noted that it is similar with period 1 count sub-element 402,
Second round count sub-element 602 can be only by the low level duration in the second pulse signal r, as two neighboring positive arteries and veins
The time interval of punching, also as second round value t2；Then preset threshold range is first subtracted one by second round comparing subunit 603
In individual sampling clock f cycle, then second week time value t2 is compared with subtracting the preset threshold range in sampling clock f cycles
Compared with, equally can according to comparative result produce the second start pulse signal j.In this illustration, sampling clock f letters compared with
Number c, anti-phase comparison signal g, the second pulse signal r, the first start pulse signal j are synchronous.
It is understood that time interval in anti-phase comparison signal g between two neighboring rising edge with comparison signal c
The computational methods of time interval between two neighboring rising edge are similar.Rising edge triggering generation unit 301 the course of work with
The course of work of trailing edge triggering generation unit 302 can be cross-referenced, its unit, module to build principle similar, it is different
, an anti-phase process more than second week time value t2 calculation procedure of the calculation procedure than period 1 value t1.
With reference to Fig. 3（a）, Fig. 3（c）With Fig. 5, it is when user sets the cycle edge of cycle triggering：Rising edge to rising edge,
I.e. by the very first time interval between two neighboring rising edge in comparison signal c, the week as the local signal in measured signal a
When time value carries out cycle triggering, the first trigger signal generation unit 303 can select to produce rising edge triggering generation unit 301
The first start pulse signal i, as trigger signal d export.
It is when user sets the cycle edge of cycle triggering：Trailing edge, i.e., will be two neighboring in comparison signal c to trailing edge
The second time interval between trailing edge, when the periodic quantity as the local signal in measured signal a carries out cycle triggering, first
Trigger signal generation unit 303 can select trailing edge triggering the second start pulse signal j caused by generation unit 302, will
It is exported as trigger signal d.
With reference to Fig. 3（b）, Fig. 3（c）With Fig. 5, it is when user sets the cycle edge of cycle triggering：Rising edge to rising edge,
Or trailing edge is to trailing edge, i.e. can both make the very first time interval between two neighboring rising edge in comparison signal c
Cycle triggering is carried out for the periodic quantity of the local signal in measured signal a；Again can be by two neighboring trailing edge in comparison signal c
Between the second time interval, as the local signal in measured signal a periodic quantity carry out cycle triggering, now, second touch
Rising edge is triggered the first start pulse signal i caused by generation unit 301 and produced with trailing edge triggering by signalling generation unit 304
First start pulse signal i caused by raw unit 302 carries out logic or processing, obtains the result s of logic or processing, as
Trigger signal d is exported.
It should be noted that after trigger control unit 203 produces trigger signal, samples storage unit 204 is believed according to triggering
Number d stores to sampled data b, produces the waveform display data e shown for waveform.It is not to say that, often produces one and touch
Signalling d, samples storage unit 204 just store in response to trigger signal d to sampled data b.Because sampling is deposited
Storage unit 204 carries out pre-sampling storage to sampled data first, within this period of pre-sampling storage, samples storage unit
204 are not responding to trigger signal d.After pre-sampling storage terminates, trigger control unit 203 can produce the enabled letter of a triggering
Number, hereafter, the ability of samples storage unit 204 proceeds by delay sampling storage to sampled data b in response to trigger signal d.And
In this period of subsequent delay samples storage, if trigger signal d is produced, samples storage unit 204 is to trigger signal d
And do not make what is responded.In addition, delay sampling storage is completed, to when having a dead band between pre-sampling storage next time
Between, in dead time, samples storage unit 204 does not also respond to trigger signal d.
With reference to Fig. 5, the result s of logic or processing is in time sequencing, not only comprising the first start pulse signal i but also has been wrapped
Signal containing the second start pulse signal j, if after trigger control unit 203 produces a triggering enable signal, samples storage list
Member 204 receives the trigger signal d for including the first start pulse signal i, then sampled data b is carried out in response to trigger signal d
Delay sampling stores, that is, carrying out cycle triggering according to the very first time interval between two neighboring rising edge；If
In this period of subsequent delay samples storage or in the dead time after the completion of delay sampling storage, samples storage list
Member 204 receives the then caused trigger signal d for including the second start pulse signal j, then is not responsive to trigger signal d；Such as
Fruit is after the storage of pre-sampling next time is completed, trigger control unit 203 produces a triggering enable signal, samples storage unit 204
The trigger signal d for including the second start pulse signal j is received, then carrying out delay to sampled data b in response to trigger signal d adopts
Sample stores, that is, realizing cycle triggering according to the second time interval between two neighboring trailing edge.
Samples storage unit 204 belongs to the content of prior art, this reality according to the process of trigger signal d progress samples storages
Apply example and only make schematic illustration, here is omitted.
It should be noted that when obtaining the periodic quantity of the local signal in measured signal a by comparison signal c, according to comparing
The train of pulse formed in signal c by low and high level, to measure two-by-two, obtain successively sequentially in time two neighboring rising edge it
Between very first time interval, at least one in the second time interval between two neighboring trailing edge, and according to obtaining successively
Time compared with the preset threshold range, triggering new d is produced according to comparative result.
It is understood that the oscillograph 200 described in the embodiment of the present invention can be also used for frequency triggering.As an act
Example explanation, in embodiments of the present invention, the user input interface are additionally operable to set frequency comparison pattern and at least one frequency
Threshold value；The frequency comparison pattern is：More than one frequency threshold, less than one frequency threshold, less than a frequency threshold or
More than another frequency threshold or more than a frequency threshold and it is less than another frequency threshold；Then trigger control unit 203
The preset threshold range is generated according to the frequency comparison pattern selected by set frequency threshold and user, it can be seen that
One or two frequency thresholds set by user, it is the endpoint value of preset threshold range.Trigger control unit 203 is by comparing
After signal c obtains the periodic quantity of the local signal in measured signal a, the periodic quantity is converted into frequency values；And by the frequency
Rate value produces trigger signal d compared with the preset threshold range, according to comparative result, so as to realize that frequency triggers.Frequently
The principle of rate triggering is with cycle triggering similar, simply more than a process by periodic quantity acquisition frequency values, here is omitted.
Above to a kind of oscillograph with cycle Trigger Function provided by the present invention, it is described in detail, herein
In apply specific case to the present invention principle and embodiment be set forth, the explanation of above example is only intended to help
Assistant solves the method and its core concept of the present invention；Meanwhile for those of ordinary skill in the art, the think of according to the present invention
Think, in specific embodiments and applications there will be changes, in summary, this specification content should not be construed as pair
The limitation of the present invention.
Claims (12)
1. a kind of oscillograph with cycle Trigger Function, including：
Data sampling unit, for carrying out digital sample to measured signal according to a sampling clock, obtain sampled data；
Digital comparing unit, compare processing for entering line level to the sampled data, produce comparison signal；
Trigger control unit, for according to the comparison signal, producing trigger signal；
Samples storage unit, for being stored according to the trigger signal to the sampled data, produce and shown for waveform
Waveform display data；
Characterized in that,
The trigger control unit, for utilizing the sampling clock, obtained by the comparison signal in the measured signal
The periodic quantity of local signal；And acquired periodic quantity is produced compared with a preset threshold range according to comparative result
The trigger signal.
2. oscillograph as claimed in claim 1, it is characterised in that
The trigger control unit is used for according to the sampling clock, obtains in the comparison signal between two neighboring rising edge
Very first time interval, as the local signal in acquired measured signal period 1 be worth；And will be acquired
Period 1 value produces the trigger signal compared with the preset threshold range, according to comparative result.
3. oscillograph as claimed in claim 1, it is characterised in that
The trigger control unit is used for according to the sampling clock, obtains in the comparison signal between two neighboring rising edge
Very first time interval, as the local signal in acquired measured signal period 1 be worth；According to the sampling
Clock, the second time interval between two neighboring trailing edge in the comparison signal is obtained, be tested as acquired
The second week time value of local signal in signal；
And by acquired period 1 value and second week time value respectively compared with the preset threshold range, according to comparing
As a result the trigger signal is produced.
4. oscillograph as claimed in claim 3, it is characterised in that the trigger control unit includes：
Rising edge triggers generation unit, for according to the sampling clock obtain in the comparison signal two neighboring rising edge it
Between very first time interval, as the local signal in acquired measured signal period 1 be worth；And by described
One periodic quantity, when the period 1, value was in the preset threshold range, produces one compared with preset threshold range
Individual first start pulse signal；
Trailing edge triggers generation unit, for according to the sampling clock obtain in the comparison signal two neighboring trailing edge it
Between the second time interval, as the second week time value of the local signal in acquired measured signal；And by described
Two cycles value is compared with preset threshold range, when the second week time value is in the preset threshold range, produces one
Individual second start pulse signal；
First trigger signal generation unit, for selecting in first start pulse signal and second start pulse signal
One, as trigger signal export.
5. oscillograph as claimed in claim 3, it is characterised in that the trigger control unit includes：
Rising edge triggers generation unit, for according to the sampling clock obtain in the comparison signal two neighboring rising edge it
Between very first time interval, as the local signal in acquired measured signal period 1 be worth；And by described
One periodic quantity, when the period 1, value was in the preset threshold range, produces one compared with preset threshold range
Individual first start pulse signal；
Trailing edge triggers generation unit, for according to the sampling clock obtain in the comparison signal two neighboring trailing edge it
Between the second time interval, as the second week time value of the local signal in acquired measured signal；And by described
Two cycles value is compared with preset threshold range, when the second week time value is in the preset threshold range, produces one
Individual second start pulse signal；
Second trigger signal generation unit, for first start pulse signal and second start pulse signal progress
Logic or processing, logic or the result of processing are exported as trigger signal.
6. the oscillograph as described in claim 4 or 5, it is characterised in that
The trailing edge triggering generation unit carries out anti-phase processing to the comparison signal, obtains an anti-phase comparison signal；And
The time interval in the anti-phase comparison signal between two neighboring rising edge is obtained according to the sampling clock, obtains the ratio
Compared with the second time interval between two neighboring trailing edge in signal.
7. the oscillograph as described in claim 4 or 5, it is characterised in that the rising edge triggering generation unit includes：
Period 1 handles subelement, for producing a pulsewidth in the rising edge of the comparison signal as sampling clock cycle
Positive pulse, obtain first pulse signal for including at least two positive pulses；
Period 1 count sub-element, for calculating two neighboring positive arteries and veins in first pulse signal according to the sampling clock
The time interval of punching, the very first time interval is obtained, be worth as the period 1 and export；
Period 1 comparing subunit, for by the period 1 value compared with preset threshold range, when described first
When periodic quantity is in preset threshold range, the rising edge of the latter positive pulse in the two neighboring positive pulse, described in generation
First start pulse signal.
8. oscillograph as claimed in claim 7, it is characterised in that the period 1 count sub-element includes：
First number accumulator, for when first pulse signal is low level, to the data variation of the sampling clock
Number is added up, and when it is high level that first pulse signal is by low transition, is counted accumulation result as first
Value output, accumulation result is reset resetted afterwards；
Very first time acquisition module, for according to sampling clock cycle, when first count value is converted into described first
Between be spaced, as the period 1 be worth export.
9. oscillograph as claimed in claim 6, it is characterised in that the trailing edge triggering generation unit includes：
Anti-phase processing subelement, for carrying out anti-phase processing to the comparison signal, obtain the anti-phase comparison signal；
Second round handles subelement, is sampling clock week for producing a pulsewidth in the rising edge of the anti-phase comparison signal
The positive pulse of phase, obtain second pulse signal for including at least two positive pulses；
Second round count sub-element, for calculating two neighboring positive arteries and veins in second pulse signal according to the sampling clock
The time interval of punching, second time interval is obtained, exported as the second week time value；
Second round comparing subunit, for by the second week time value compared with preset threshold range, when described second
When periodic quantity is in preset threshold range, the rising edge of the latter positive pulse in the two neighboring positive pulse, described in generation
Second start pulse signal.
10. oscillograph as claimed in claim 9, it is characterised in that the second round count sub-element includes：
Second number accumulator, for when second pulse signal is low level, to the data variation of the sampling clock
Number is added up, and when it is high level that second pulse signal is by low transition, is counted accumulation result as second
Value output, accumulation result is reset resetted afterwards；
Second time-obtaining module, for according to sampling clock cycle, when second count value is converted into described second
Between be spaced, as the second week time value export.
11. oscillograph as claimed in claim 1, it is characterised in that also include：
User input interface, for setting cycle comparison pattern and at least one Ct value time；
The trigger control unit was additionally operable to according to set Ct value time and the generation of selected cycle comparison pattern
The preset threshold range.
12. oscillograph as claimed in claim 1, it is characterised in that
The data sampling unit is used for the measured signal to multiple passages respectively and carries out digital sample, obtains corresponding multichannel and adopts
Sample data；
The digital comparing unit compares processing for entering line level to the multi-channel sampling data respectively, produces corresponding multichannel
Compare result, and compare from the multichannel and selected in result wherein all the way as data comparing unit output
Comparison signal.
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| CN104820120B (en) * | 2015-04-20 | 2018-01-30 | 深圳市鼎阳科技有限公司 | A kind of method and apparatus for improving signal triggering precision |
| CN108646072B (en) * | 2018-05-16 | 2019-12-27 | 电子科技大学 | Trigger generating device based on Hamming distance |
| CN108982941A (en) * | 2018-06-20 | 2018-12-11 | 深圳市鼎阳科技有限公司 | A kind of method for real-time measurement and device, oscillograph, storage medium of period frequency |
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| US7072804B2 (en) * | 2004-09-28 | 2006-07-04 | Agilent Technologies, Inc. | Digital trigger filter for a real time digital oscilloscope |
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| CN201508381U (en) * | 2009-07-21 | 2010-06-16 | 北京普源精电科技有限公司 | Digital oscilloscope with video triggering function |
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