CN108768402A - signal output method and device - Google Patents
signal output method and device Download PDFInfo
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- CN108768402A CN108768402A CN201810505564.9A CN201810505564A CN108768402A CN 108768402 A CN108768402 A CN 108768402A CN 201810505564 A CN201810505564 A CN 201810505564A CN 108768402 A CN108768402 A CN 108768402A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
- H03M1/70—Automatic control for modifying converter range
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Abstract
A kind of signal output method of the application offer and device.This method includes：When the amplitude of digital signal is less than first threshold, the amplitude of the digital signal is amplified into specified multiple, the amplitude for amplifying specified multiple is less than the second threshold；Amplitude is amplified to the digital signal after specified multiple and switchs to analog signal；Decayed to the analog signal according to the corresponding specified attenuation gear of the specified multiple, the analog signal after output attenuatoin, the amplitude of the analog signal after the decaying is equal to the amplitude of the digital signal before amplitude amplification specified multiple.The performance of DAC, output waveform analog signal with high accuracy is made full use of especially to improve accuracy of waveform of the DAC when converting small signal with this.
Description
Technical field
This application involves electromagnetic application technical field more particularly to a kind of signal output methods and device.
Background technology
It, can be according to the frequency, amplitude or phase etc. of the analog signal in order to export the analog signal of specified waveform
Carry out digital coding, by the digital signal after coding by digital analog converter (digital to analog converter,
DAC the analog signal of specified waveform) is converted to.
The precision of analog signal waveform influences the analog signal performance, for example, in magnetic resonance system, accuracy of waveform is high
Signal can be precisely accomplished low-angle excitation, and the low signal of accuracy of waveform cannot then complete low-angle excitation, or excitation
It is inaccurate, diagnosis needs cannot be met.
DAC then directly affects the precision of analog signal.For different DAC, DAC precision (that is, DAC digits) is higher, turns
The precision of analog signal after changing is higher, and for same DAC, which converts larger signal (that is, amplitude larger signal)
Precision wants smaller signal (that is, amplitude smaller signal) high.This is resulted in, when needing the higher signal of waveform accuracy,
It disclosure satisfy that the DAC of the accuracy requirement of big signal, but can not meet the required precision of small signal, to need according to small signal
Required precision, the higher DAC of choice accuracy, but the DAC that precision is higher, it is more expensive.
Invention content
In view of this, a kind of signal output method of the application offer and device.
Specifically, the application is achieved by the following technical solution：
In a first aspect, an embodiment of the present invention provides a kind of signal output methods.Wherein, the optimal magnitude area of digital-to-analogue conversion
Between be first threshold between second threshold, this method includes：
When the amplitude of digital signal is less than first threshold, the amplitude of the digital signal is amplified into specified multiple, amplification
The amplitude of specified multiple is less than the second threshold；
Amplitude is amplified to the digital signal after specified multiple and switchs to analog signal；
Decayed to the analog signal according to the corresponding specified attenuation gear of the specified multiple, after output attenuatoin
Analog signal, the amplitude of the analog signal after the decaying are equal to the amplitude of the digital signal before amplitude amplification specified multiple.
Optionally, described when the amplitude of digital signal is less than first threshold, the amplitude amplification of the digital signal is referred to
Determining multiple includes：
It, will be described according to the sequence of multiple set medium multiple from small to large when the amplitude of digital signal is less than first threshold
The amplitude of digital signal is amplified, until amplified amplitude is more than first threshold；
When this amplified amplitude be more than first threshold, and less than second threshold when, select this amplify multiple and
The multiple of this amplified amplitude of the digital signal, this amplification is the specified multiple；
It is primary before the multiple once amplified before selection and the digital signal when amplified amplitude is less than second threshold
Amplified amplitude, the multiple once amplified before described are the specified multiple.
Optionally, the optimal magnitude section is the optimum linear operation interval of DAC, and the first threshold is the DAC
70 percent corresponding amplitude of full precision, the second threshold are the corresponding amplitude of a hundred percent that the DAC expires precision.
Optionally, before or after the amplification specified multiple by the amplitude, further include：
Predefine the correspondence of multiple and gear of decaying；
According to the correspondence of the multiple and decaying gear, the corresponding specified attenuation gear of the specified multiple is selected.
Optionally, after the analog signal after the output attenuatoin, further include：
Acquire the amplitude of the analog signal after specified attenuation gear decaying；
The amplitude of digital signal before amplifying specified multiple with amplitude according to the amplitude of acquisition is compared, and adjusts the finger
Surely the correspondence of decaying gear and multiple.
Optionally, before or after the amplification specified multiple by the amplitude, further include：
Predefine the correspondence of decaying gear and phase difference；
The corresponding designated phase of the specified attenuation gear is determined according to the decaying gear and the correspondence of phase difference
Difference；
Phase compensation is carried out to the digital signal according to the designated phase difference.
Optionally, after the analog signal after the output attenuatoin, further include：
Acquire the phase of the analog signal after specified attenuation gear decaying；
The phase of digital signal before amplifying specified multiple with amplitude according to the phase of acquisition is compared, and adjusts the finger
Surely the corresponding phase difference of decaying gear.
Second aspect, an embodiment of the present invention provides a kind of signal output apparatus.The optimal magnitude section of digital-to-analogue conversion is
To between second threshold, described device includes first threshold：
Amplification module, for when the amplitude of digital signal is less than first threshold, the amplitude of the digital signal to be amplified
Specified multiple, the amplitude for amplifying specified multiple are less than the second threshold；
Conversion module, for the digital signal after amplitude amplification specified multiple to be switched to analog signal；
Attenuation module, for being declined to the analog signal according to the corresponding specified attenuation gear of the specified multiple
Subtract, the analog signal after output attenuatoin, the amplitude of the analog signal after the decaying is equal to the number before amplitude amplification specified multiple
The amplitude of word signal.
Optionally, the amplification module is specifically used for：
It, will be described according to the sequence of multiple set medium multiple from small to large when the amplitude of digital signal is less than first threshold
The amplitude of digital signal is amplified, until amplified amplitude is more than first threshold；
When this amplified amplitude be more than first threshold, and less than second threshold when, select this amplify multiple and
The multiple of this amplified amplitude of the digital signal, this amplification is the specified multiple；
It is primary before the multiple once amplified before selection and the digital signal when amplified amplitude is more than second threshold
Amplified amplitude, the multiple once amplified before described are the specified multiple.
Optionally, the optimal magnitude section is the optimum linear operation interval of DAC, and the first threshold is the DAC
70 percent corresponding amplitude of full precision, the second threshold are the corresponding amplitude of a hundred percent that the DAC expires precision.
Optionally, further include：
First determining module, the correspondence for predefining multiple and gear of decaying；
Selecting module selects the specified multiple corresponding for the correspondence according to the multiple and decaying gear
Specified attenuation gear.
Optionally, further include：
First acquisition module, the amplitude for acquiring the analog signal after specified attenuation gear decaying；
The first adjustment module, for according to the amplitude of the amplitude of acquisition and the digital signal before amplitude amplification specified multiple into
Row compares, and adjusts the correspondence of the specified attenuation gear and multiple.
Optionally, further include：
Second determining module, the correspondence for predefining decaying gear and phase difference；
Third determining module, for determining the specified attenuation shelves according to the correspondence of the decaying gear and phase difference
The corresponding designated phase in position is poor；
Compensating module, for carrying out phase compensation to the digital signal according to the designated phase difference.
Optionally, further include：
Second acquisition module, the phase for acquiring the analog signal after specified attenuation gear decaying；
Second adjustment module, for according to the phase of the phase of acquisition and the digital signal before amplitude amplification specified multiple into
Row compares, and adjusts the corresponding phase difference of the specified attenuation gear.
The third aspect, an embodiment of the present invention provides a kind of NMR systems, including such as the aforementioned second party of claim
Face and its any one of optionally realize described in signal output apparatus.
Fourth aspect, this specification embodiment provide a kind of computer equipment, including memory, processor and are stored in
On memory and the computer program that can run on a processor, which is characterized in that the processor executes real when described program
The method and step of existing aforementioned first aspect.
5th aspect, provides a kind of computer readable storage medium, meter is stored on the computer readable storage medium
Calculation machine program, the computer program realize the method described in above-mentioned first aspect when being executed by processor.
6th aspect provides a kind of computer program product including instruction, when described instruction is run on computers
When so that computer executes the method described in above-mentioned first aspect.
The embodiment of the present invention is by amplifying the amplitude of digital signal, so that DAC being capable of the higher mould of output waveform precision
Quasi- signal, then by the link that decays by the amplitude attenuation of obtained analog signal to expected size, to make full use of the property of DAC
Can, output waveform analog signal with high accuracy especially improves accuracy of waveform of the DAC when converting small signal, reduces defeated
Go out the equipment cost of high-precision waveform.
Description of the drawings
Fig. 1 is a kind of flow diagram of signal output method provided in an embodiment of the present invention；
Fig. 2 is an example provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of signal output apparatus provided in an embodiment of the present invention；
Fig. 4 is a kind of computer equipment provided in an embodiment of the present invention.
Specific implementation mode
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of consistent device and method of some aspects be described in detail in claims, the application.
It is the purpose only merely for description specific embodiment in term used in this application, is not intended to be limiting the application.
It is also intended to including majority in the application and "an" of singulative used in the attached claims, " described " and "the"
Form, unless context clearly shows that other meanings.It is also understood that term "and/or" used herein refers to and wraps
Containing one or more associated list items purposes, any or all may be combined.
It will be appreciated that though various information, but this may be described using term first, second, third, etc. in the application
A little information should not necessarily be limited by these terms.These terms are only used for same type of information being distinguished from each other out.For example, not departing from
In the case of the application range, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as
One information.Depending on context, word as used in this " if " can be construed to " ... when " or " when ...
When " or " in response to determination ".
The embodiment of the present invention, which is suitable for being applied to having, carries out digital coding, digital-to-analogue conversion and output analog signal function
On device, such as in the equipment such as NMR system, computer equipment.Below by taking NMR system as an example, to the present invention into
Row is further introduced.
Magnetic resonance system includes magnet system, gradient system, radio frequency system and signal acquisition module and image reconstruction system
The compositions such as system.Wherein, magnet system provides main field that is uniform and stablizing for magnetic resonance imaging system, and gradient system is total for magnetic
Vibrating system provide the linearity meet the requirements, can high-speed switch gradient magnetic, superposition on the main magnetic field, dynamically to change
Main field is implemented as the space orientation of voxel.
Radio frequency system is mainly made of small signal output board, RF power amplification and transmitting/receiving coil.Small signal output is penetrated
Frequency pulse forms required radiofrequency field by RF power amplification by transmitting coil, completes selectivity/nonselective excitation.Excitation
The amplitude that is exported by radio frequency of flip angle and width control, the output of low-angle flip angle is smaller usually due to signal output amplitude
It can cause to be distorted due to the quantizing noise of analog-digital chip.The embodiment of the present invention passes through a kind of signal output method of offer and dress
The precision of small signal output waveform can be improved by setting, so as to remain to accurately complete when needing low-angle to excite.
The embodiment of the present invention is further introduced below in conjunction with the accompanying drawings.
Referring to FIG. 1, Fig. 1 is a kind of flow diagram of signal output method provided in an embodiment of the present invention.This method
Suitable for signal output apparatus, wherein the optimal magnitude section of digital-to-analogue conversion is first threshold between second threshold, best width
It is worth the optimum linear operation interval that section is DAC, for example, first threshold can be the 70% corresponding amplitude that DAC expires precision, the
Two threshold values can be the 100% corresponding amplitude that DAC expires precision.This method specifically comprises the following steps：
The amplitude of the digital signal is amplified specified multiple by S110 when the amplitude of digital signal is less than first threshold.
Wherein, the amplitude for amplifying specified multiple is less than the second threshold.
It, can be according to the frequency of the analog signal during analog signal of waveform is specified in output in specific implementation
Rate, amplitude or phase etc. carry out digital coding and obtain digital signal, then, by the way that the digital signal is carried out digital-to-analogue conversion
The analog signal of specified waveform is obtained, specifically, the Wave data precalculated is stored in by the precision of DAC output waveforms
Base band, Wave data usually by I, Q two paths of signals or in which composition all the way generate and adjust by digital quadrature mixing link etc.
Digital signal processed.The amplitude during digital signal encoding can be obtained, for example, the original amplitude that can be down passed according to host computer
Information determines the amplitude of the digital signal.
After determining the amplitude of the digital signal, it can be determined that whether need to carry out digital amplification to amplitude, so as to
The precision of DAC is utilized to the greatest extent.
Specifically, judge whether the amplitude of digital signal is less than first threshold.When less than first threshold, expression can not
The precision for utmostly utilizing DAC, needs to be amplified the amplitude of the digital signal.When more than first threshold, then it represents that
The precision that DAC can utmostly be utilized, is amplified without the amplitude to the digital signal.
Can be corresponding with the decaying of the analog signal in subsequent step to the amplification of amplitude in this step, to decay
When, the analog signal that is needed.So attenuation coefficient table can be pre-established, which may include that amplitude is put
The correspondence of big multiple and decaying gear, wherein each decaying gear corresponds to an attenuation coefficient, which can wait
It is same as multiple.
For example, the analog signal of an amplitude can be selected, switch the different stalls of attenuator successively and acquire different shelves
Output under position, the analog signal of acquisition is compared with the amplitude of the analog signal before decaying, determines the simulation before decaying
The ratio of the amplitude of the amplitude of signal and the analog signal of acquisition, the ratio are the coefficient of attenuator.For another example with 0dB's
Output valve as reference, successively by 1 to 15dB when output valve and the value of 0dB be divided by, using the inverse of result as this gear
Attenuation coefficient.
When the amplitude to digital signal is amplified, the multiple of amplitude amplification can be determined simultaneously, so as to subsequently selected
Decaying gear, specifically can at least be accomplished in several ways：
In one example, when the amplitude of digital signal be less than first threshold when, according to multiple set medium multiple from it is small to
Big sequence amplifies the amplitude of digital signal, until amplified amplitude is more than first threshold；
When this amplified amplitude be more than first threshold, and less than second threshold when, select this amplify multiple and
This amplified amplitude, at this point, the multiple of this amplification is specified multiple；
When amplified amplitude is more than second threshold, the multiple and preceding primary amplified width that once amplify before selection
Value, at this point, the preceding multiple once amplified is the specified multiple.
For example, the original amplitude of digital signal is multiplied with 16 attenuation coefficients successively, the coefficient of 0dB is sentenced as the 1st grade
Whether disconnected product is more than 70% that DAC expires precision output, if it is, stopping calculating；If it is not, then continuing and next system
Number is multiplied, i.e., the coefficient of 1dB is as the 2nd grade；And so on until 15dB.If N (N is the integer in 1 to 16) grade meets
This condition, it is also necessary to ensure that product cannot be more than DAC expires precision output 100%, if more than 100%, then return back to
It N-1 grades, is multiplied using N-1 grades of coefficient with original amplitude and is calculated as the amplitude of output as a result, and exporting N-1 as attenuator
The result of gear selection；By the crest meter as output that N grades of coefficient is multiplied with original amplitude if being not above 100%
It calculates as a result, and exporting the result that N is selected as attenuator gear.
It in another example, can be according to the calculating specified multiple of first threshold, second threshold and digital signal, so
Afterwards, the amplitude of the digital signal is amplified into specified multiple.
Amplitude is amplified the digital signal after specified multiple and switchs to analog signal by S120.
When realizing, amplitude is amplified to the digital data transmission after specified multiple to DAC, is switched to for analog signal by DAC,
And by DAC by transformed analog signal transmission to attenuator.
S130 decays to the analog signal according to the corresponding specified attenuation gear of the specified multiple, and output declines
Analog signal after subtracting.Wherein, the amplitude of the analog signal after decaying is equal to the digital signal before amplitude amplification specified multiple
Amplitude.
Realize when, before or after S110, can according to predetermined multiple with decaying gear correspondence,
Select the corresponding specified attenuation gear of the specified multiple.For example, according to aforementioned attenuation coefficient the table multiple for including and shelves of decaying
The correspondence of position, determines the corresponding specified attenuation gear of specified multiple.Then according to selected decaying gear to analog signal
Decay, has obtained the analog signal of specified amplitude.
In one embodiment, since the variation of attenuator performance is (for example, the performance of attenuator can be due to the use of causing to damage
Consumption, to make performance decline), it can also dynamically adjust the correspondence of multiple and gear of decaying.Based on this, can go back in this way
Include the following steps：
Acquire the amplitude of the analog signal after the decaying of specified attenuation gear；
The amplitude of digital signal before amplifying specified multiple with amplitude according to the amplitude of acquisition is compared, and adjusts the finger
Surely the correspondence of decaying gear and multiple.
Specifically, which can be carried out with certain period, which can be according to the access times of attenuator
And/or the time determines.
In another embodiment, by the analog signal of attenuator, in fact it could happen that certain phase difference, the phase difference with
Gear of decaying is related.The correspondence that decaying gear and phase difference can be predefined, for example, can be by under different stalls
Output signal acquisition, by quadrature demodulation obtain signal phase, the phase of each shelves is subtracted each other with the phase of 0dB successively,
The phase control words that obtain 15 differences are converted to digital controlled oscillator, to carry out the benefit of phase according to the phase control words
It repays.
It further, can be according to the correspondence of the decaying gear and phase difference before or after S110, it would be desirable to
By the analog signal that specified gear decays, the phase of the digital signal before digital-to-analogue conversion is adjusted in advance, to pass through
Expected analog signal is obtained after overdamping device.
Based on this, realized especially by following steps：
Determine that the corresponding designated phase of specified attenuation gear is poor according to decaying gear and the correspondence of phase difference；
Phase compensation is carried out to digital signal according to designated phase difference.
In addition, since the variation of attenuator performance can also affect on phase, it can also dynamic adjustment decaying gear and phase
The correspondence of difference.Can further include following steps in this way based on this：
Acquire the phase of the analog signal after the decaying of specified attenuation gear；
The phase of digital signal before amplifying specified multiple with amplitude according to the phase of acquisition is compared, and adjusts the finger
Surely the corresponding phase difference of decaying gear.
Specifically, which can be carried out with certain period, which can be according to the access times of attenuator
And/or the time determines.Adjusting the decaying gear can be with the period of adjustment multiple and the correspondence for gear of decaying with phase difference
It is identical.
The embodiment of the present invention is by amplifying the amplitude of digital signal, so that DAC being capable of the higher mould of output waveform precision
Quasi- signal, then by the link that decays by the amplitude attenuation of obtained analog signal to expected size, to make full use of the property of DAC
Can, output waveform analog signal with high accuracy especially improves accuracy of waveform of the DAC when converting small signal, reduces defeated
Go out the equipment cost of high-precision waveform.
In one example, it as shown in Fig. 2, in order to export the signal of specified radio frequency waveform, is usually deposited in advance in numeric field
Store up baseband waveform data, Wave data usually by I, Q two paths of signals or in which composition all the way, digital controlled oscillator generate it is initial just
String wave and cosine wave, by I, Q two paths of signals or in which figuration is carried out to original sine wave all the way, it is mixed using digital quadrature
Frequency link obtains the signal before input DAC.According to the crest meter of the signal of the specified radio frequency waveform obtained from baseband memory
Calculate the specified multiple for needing to amplify and corresponding decaying gear.Signal before input DAC is amplified into specified multiple, is input to
DAC.The analog signal input attenuator that DAC is output it, the attenuator export after being decayed according to selected decaying gear
Signal, the signal of the output are the analog signal of specified waveform.Wherein, the correspondence of decaying gear and multiple can be advance
It determines, and is adjusted according to the amplitude of the output signal of acquisition.It is possible to further carry out phase tune in digital controlled oscillator
It is whole, and according to the correspondence of the phase adjustment of the output signal of acquisition decaying gear and phase.
Referring to FIG. 3, Fig. 3 is a kind of signal output apparatus structural schematic diagram provided in an embodiment of the present invention.Such as Fig. 3 institutes
Show, the optimal magnitude section of digital-to-analogue conversion is first threshold between second threshold, which specifically includes：
Amplification module 301, for when the amplitude of digital signal is less than first threshold, the amplitude of the digital signal to be put
Big specified multiple, the amplitude for amplifying specified multiple are less than the second threshold；
Conversion module 302, for the digital signal after amplitude amplification specified multiple to be switched to analog signal；
Attenuation module 303, for being carried out to the analog signal according to the corresponding specified attenuation gear of the specified multiple
Decaying, the analog signal after output attenuatoin, before the amplitude of the analog signal after the decaying is equal to amplitude amplification specified multiple
The amplitude of digital signal.
In one example, amplification module 301 is specifically used for：
It, will be described according to the sequence of multiple set medium multiple from small to large when the amplitude of digital signal is less than first threshold
The amplitude of digital signal is amplified, until amplified amplitude is more than first threshold；
When this amplified amplitude is more than the first threshold, and is less than second threshold, times of this amplification is selected
The multiple of number and this amplified amplitude of the digital signal, this amplification is the specified multiple；
It is primary before the multiple once amplified before selection and the digital signal when amplified amplitude is more than second threshold
Amplified amplitude, the multiple once amplified before described are the specified multiple.
In another example, the optimal magnitude section is the optimum linear operation interval of DAC, and the first threshold is
The DAC expires 70 percent corresponding amplitude of precision, and the second threshold is a hundred percent correspondence that the DAC expires precision
Amplitude.
In another example, further include：
First determining module, the correspondence for predefining multiple and gear of decaying；
Selecting module selects the specified multiple corresponding for the correspondence according to the multiple and decaying gear
Specified attenuation gear.
In another example, further include：
First acquisition module, the amplitude for acquiring the analog signal after specified attenuation gear decaying；
The first adjustment module, for according to the amplitude of the amplitude of acquisition and the digital signal before amplitude amplification specified multiple into
Row compares, and adjusts the correspondence of the specified attenuation gear and multiple.
In another example, further include：
Second determining module, the correspondence for predefining decaying gear and phase difference；
Third determining module, for determining the specified attenuation shelves according to the correspondence of the decaying gear and phase difference
The corresponding designated phase in position is poor；
Compensating module, for carrying out phase compensation to the digital signal according to the designated phase difference.
In another example, further include：
Second acquisition module, the phase for acquiring the analog signal after specified attenuation gear decaying；
Second adjustment module, for according to the phase of the phase of acquisition and the digital signal before amplitude amplification specified multiple into
Row compares, and adjusts the corresponding phase difference of the specified attenuation gear.
Corresponding with the embodiment of aforementioned signal output method, present invention also provides the embodiments of signal output apparatus.
The embodiment of the application signal output apparatus can be applied on a computing device.Device embodiment can be by soft
Part is realized, can also be realized by way of hardware or software and hardware combining.For implemented in software, as a logical meaning
On device, be by the processor of computer equipment where it by corresponding computer program instructions in nonvolatile memory
Read what operation in memory was formed.For hardware view, as shown in figure 4, to be calculated where the application signal output apparatus
A kind of hardware structure diagram of machine equipment in addition to processor shown in Fig. 4 (base band), memory, radio frequency unit and non-volatile is deposited
Except reservoir, the computer equipment in embodiment where device can also be wrapped generally according to the actual functional capability of the computer equipment
Other hardware are included, this is repeated no more.
The function of each unit and the realization process of effect specifically refer to and correspond to step in the above method in above-mentioned apparatus
Realization process, details are not described herein.
For device embodiments, since it corresponds essentially to embodiment of the method, so related place is referring to method reality
Apply the part explanation of example.The apparatus embodiments described above are merely exemplary, wherein described be used as separating component
The unit of explanation may or may not be physically separated, and the component shown as unit can be or can also
It is not physical unit, you can be located at a place, or may be distributed over multiple network units.It can be according to actual
It needs that some or all of module therein is selected to realize the purpose of application scheme.Those of ordinary skill in the art are not paying
In the case of going out creative work, you can to understand and implement.
Theme described in this specification and the embodiment of feature operation can be realized in the following：Fundamental Digital Circuit,
The computer software or firmware including the computer of structure disclosed in this specification and its structural equivalents of tangible embodiment are hard
The combination of part or one or more of which.The embodiment of theme described in this specification can be implemented as one or
Multiple computer programs encode on tangible non-transitory program carrier to be executed or controlled at data by data processing equipment
Manage one or more of the computer program instructions of operation of device module.Alternatively, or in addition, program instruction can be with
It is coded on manually generated transmitting signal, such as electricity, light or the electromagnetic signal that machine generates, the signal are generated will believe
Breath encodes and is transferred to suitable receiver apparatus to be executed by data processing equipment.Computer storage media can be that machine can
Read storage device, machine readable storage substrate, random or serial access memory equipment or one or more of which group
It closes.
Processing described in this specification and logic flow can by execute one of one or more computer programs or
Multiple programmable calculators execute, to execute corresponding function by the way that output is operated and generated according to input data.Institute
It states processing and logic flow can also be by dedicated logic circuit-such as FPGA (field programmable gate array) or ASIC (special collection
At circuit) it executes, and device can also be embodied as dedicated logic circuit.
The computer for being suitable for carrying out computer program includes, for example, general and/or special microprocessor or it is any its
The central processing unit of his type.In general, central processing unit will refer to from read-only memory and/or random access memory reception
Order and data.The basic module of computer includes central processing unit for being practiced or carried out instruction and for storing instruction
With one or more memory devices of data.In general, computer will also be including one or more great Rong for storing data
Measuring storage device, such as disk, magneto-optic disk or CD etc. or computer will operationally couple with this mass-memory unit
To receive from it data or have both at the same time to its transmission data or two kinds of situations.However, computer is not required to have in this way
Equipment.In addition, computer can be embedded in another equipment, such as mobile phone, personal digital assistant (PDA), mobile sound
Frequency or video player, game console, global positioning system (GPS) receiver or such as universal serial bus (USB) flash memory
The portable memory apparatus of driver, names just a few.
It is suitable for storing computer program instructions and the computer-readable medium of data including the non-volatile of form of ownership
Memory, medium and memory devices, for example, including semiconductor memory devices (such as EPROM, EEPROM and flash memory device),
Disk (such as internal hard drive or removable disk), magneto-optic disk and CD ROM and DVD-ROM disks.Processor and memory can be by special
It is supplemented or is incorporated in dedicated logic circuit with logic circuit.
Although this specification includes many specific implementation details, these are not necessarily to be construed as the model for limiting any invention
It encloses or range claimed, and is primarily used for describing the feature of the specific embodiment of specific invention.In this specification
Certain features described in multiple embodiments can also be combined implementation in single embodiment.On the other hand, individually implementing
Various features described in example can also be performed separately or be implemented with any suitable sub-portfolio in various embodiments.This
Outside, although feature can work in certain combinations and even initially so be claimed as described above, institute is come from
One or more of claimed combination feature can be removed from the combination in some cases, and claimed
Combination can be directed toward the modification of sub-portfolio or sub-portfolio.
Similarly, although depicting operation in the accompanying drawings with particular order, this is understood not to require these behaviour
Make the particular order shown in execute or sequentially carry out or require the operation of all illustrations to be performed, to realize desired knot
Fruit.In some cases, it may be advantageous for multitask and parallel processing.In addition, the various system modules in above-described embodiment
Separation with component is understood not to be required to such separation in all embodiments, and it is to be understood that described
Program assembly and system usually can be together integrated in single software product, or be packaged into multiple software product.
The specific embodiment of theme has been described as a result,.Other embodiment is within the scope of the appended claims.?
In some cases, action described in claim can be executed in different order and still realize desired result.This
Outside, the processing described in attached drawing and it is nonessential shown in particular order or sequential order, to realize desired result.In certain realities
In existing, it may be advantageous for multitask and parallel processing.
The foregoing is merely the preferred embodiments of the application, not limiting the application, all essences in the application
With within principle, any modification, equivalent substitution, improvement and etc. done should be included within the scope of the application protection god.
Claims (15)
1. a kind of signal output method, which is characterized in that the optimal magnitude section of digital-to-analogue conversion is first threshold to second threshold
Between, the method includes：
When the amplitude of digital signal is less than the first threshold, the amplitude of the digital signal is amplified into specified multiple, amplification
The amplitude of specified multiple is less than the second threshold；
Amplitude is amplified to the digital signal after specified multiple and switchs to analog signal；
Decayed to the analog signal according to the corresponding specified attenuation gear of the specified multiple, the simulation after output attenuatoin
Signal, the amplitude of the analog signal after the decaying are equal to the amplitude of the digital signal before amplitude amplification specified multiple.
2. according to the method described in claim 1, it is characterized in that, described when the amplitude of digital signal is less than the first threshold
When, include by the amplitude amplification specified multiple of the digital signal：
It, will be described according to the sequence of multiple set medium multiple from small to large when the amplitude of digital signal is less than the first threshold
The amplitude of digital signal is amplified, until amplified amplitude is more than the first threshold；
When this amplified amplitude is more than the first threshold, and is less than the second threshold, times of this amplification is selected
The multiple of number and this amplified amplitude of the digital signal, this amplification is the specified multiple；
It is primary before the multiple once amplified before selection and the digital signal when amplified amplitude is more than the second threshold
Amplified amplitude, the multiple once amplified before described are the specified multiple.
3. method according to claim 1 or 2, which is characterized in that the optimal magnitude section is the optimum linear work of DAC
Make section, the first threshold is the 70 percent corresponding amplitude that the DAC expires precision, and the second threshold is described
DAC expires the corresponding amplitude of a hundred percent of precision.
4. according to the method described in claim 1, it is characterized in that, it is described by the amplitude amplify specified multiple before or it
Afterwards, further include：
Predefine the correspondence of multiple and gear of decaying；
According to the correspondence of the multiple and decaying gear, the corresponding specified attenuation gear of the specified multiple is selected.
5. according to the method described in claim 4, it is characterized in that, after analog signal after the output attenuatoin, also wrap
It includes：
Acquire the amplitude of the analog signal after specified attenuation gear decaying；
The amplitude of digital signal before amplifying specified multiple with amplitude according to the amplitude of acquisition is compared, and is adjusted described specify and is declined
The correspondence of downshift position and multiple.
6. according to the method described in claim 1, it is characterized in that, it is described by the amplitude amplify specified multiple before or it
Afterwards, further include：
Predefine the correspondence of decaying gear and phase difference；
Determine that the corresponding designated phase of the specified attenuation gear is poor according to the decaying gear and the correspondence of phase difference；
Phase compensation is carried out to the digital signal according to the designated phase difference.
7. according to the method described in claim 6, it is characterized in that, after analog signal after the output attenuatoin, also wrap
It includes：
Acquire the phase of the analog signal after specified attenuation gear decaying；
The phase of digital signal before amplifying specified multiple with amplitude according to the phase of acquisition is compared, and is adjusted described specify and is declined
The corresponding phase difference in downshift position.
8. a kind of signal output apparatus, which is characterized in that the optimal magnitude section of digital-to-analogue conversion is first threshold to second threshold
Between, described device includes：
Amplification module, for when the amplitude of digital signal is less than the first threshold, the amplitude of the digital signal to be amplified
Specified multiple, the amplitude for amplifying specified multiple are less than the second threshold；
Conversion module, for the digital signal after amplitude amplification specified multiple to be switched to analog signal；
Attenuation module, it is defeated for being decayed to the analog signal according to the corresponding specified attenuation gear of the specified multiple
Go out the analog signal after decaying, the amplitude of the analog signal after the decaying is equal to the digital signal before amplitude amplification specified multiple
Amplitude.
9. device according to claim 8, which is characterized in that the amplification module is specifically used for：
It, will be described according to the sequence of multiple set medium multiple from small to large when the amplitude of digital signal is less than the first threshold
The amplitude of digital signal is amplified, until amplified amplitude is more than first threshold；
When this amplified amplitude is more than the first threshold, and is less than the second threshold, times of this amplification is selected
The multiple of number and this amplified amplitude of the digital signal, this amplification is the specified multiple；
It is primary before the multiple once amplified before selection and the digital signal when amplified amplitude is more than the second threshold
Amplified amplitude, the multiple once amplified before described are the specified multiple.
10. device according to claim 8 or claim 9, which is characterized in that the optimal magnitude section is the optimum linear of DAC
Operation interval, the first threshold are the 70 percent corresponding amplitude that the DAC expires precision, and the second threshold is described
DAC expires the corresponding amplitude of a hundred percent of precision.
11. device according to claim 8, which is characterized in that further include：
First determining module, the correspondence for predefining multiple and gear of decaying；
Selecting module selects the specified multiple corresponding specified for the correspondence according to the multiple and decaying gear
Decaying gear.
12. according to the devices described in claim 11, which is characterized in that further include：
First acquisition module, the amplitude for acquiring the analog signal after specified attenuation gear decaying；
The first adjustment module, the amplitude for amplitude and the digital signal before amplitude amplification specified multiple according to acquisition are compared
Compared with adjusting the correspondence of the specified attenuation gear and multiple.
13. device according to claim 8, which is characterized in that further include：
Second determining module, the correspondence for predefining decaying gear and phase difference；
Third determining module, for determining the specified attenuation gear pair according to the correspondence of the decaying gear and phase difference
The designated phase answered is poor；
Compensating module, for carrying out phase compensation to the digital signal according to the designated phase difference.
14. device according to claim 13, which is characterized in that further include：
Second acquisition module, the phase for acquiring the analog signal after specified attenuation gear decaying；
Second adjustment module, the phase for phase and the digital signal before amplitude amplification specified multiple according to acquisition are compared
Compared with adjusting the corresponding phase difference of the specified attenuation gear.
15. a kind of NMR system includes the signal output apparatus as described in claim 8-14 any one.
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Cited By (1)
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| CN113162620A (en) * | 2021-01-30 | 2021-07-23 | 杭州微伽量子科技有限公司 | High-speed stable broadband frequency-voltage conversion method, system and storage medium |
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