CN106487385A - Multichannel raises level unipolarity quadrature square wave modulated signal single channel synchronous acquisition device - Google Patents
Multichannel raises level unipolarity quadrature square wave modulated signal single channel synchronous acquisition device Download PDFInfo
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- CN106487385A CN106487385A CN201610915149.1A CN201610915149A CN106487385A CN 106487385 A CN106487385 A CN 106487385A CN 201610915149 A CN201610915149 A CN 201610915149A CN 106487385 A CN106487385 A CN 106487385A
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- signal
- square wave
- unipolarity
- single channel
- quadrature square
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
- H03M1/126—Multi-rate systems, i.e. adaptive to different fixed sampling rates
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/1205—Multiplexed conversion systems
- H03M1/123—Simultaneous, i.e. using one converter per channel but with common control or reference circuits for multiple converters
Abstract
The invention discloses a kind of multichannel raises level unipolarity quadrature square wave modulated signal single channel synchronous acquisition device, the break-make of unipolarity quadrature square wave control at least 2 path switching circuits of predetermined level is raised, on-off circuit achieves copped wave amplitude modulation；The signal of the different frequency after amplitude modulation is carried out analog-to-digital conversion by single channel analog-digital converter and obtains data signal after adder operation circuit addition；As the unipolarity quadrature square wave signal for driving due to having raised predetermined level, low level part in unipolarity quadrature square wave signal, improve substantially compared to noise, so as to improve in unipolarity quadrature square wave signal low level section, single channel analog-digital converter carries out the signal to noise ratio that analog-to-digital conversion obtains data signal, and then improves the precision of the data signal being input in microprocessor；Microprocessor is processed to data signal, demodulates each measured signal.Present invention achieves synchronizing collection via single channel analog-digital converter to multichannel measured signal.
Description
Technical field
The present invention relates to signal measurement field, more particularly to a kind of multichannel raises level unipolarity quadrature square wave modulated signal
Single channel synchronous acquisition device.
Background technology
The variable quantity of the carrying informations such as voltage signal, represents in its relaxed state in an analogue form, but, in order to
It is easy to computer disposal, transmission and storage, generally data signal will be transformed into by ADC (analog-digital converter), therefore exist
In signal transacting, analog-to-digital conversion is requisite.
In existing multiplexed signal sampling system, generally need to arrange in pairs or groups monolithic ADC's using multi-disc ADC or multiway analog switch
Scheme, the former has, and circuit is complicated, the big shortcoming of the high and circuit size of system power dissipation；And the latter then can in gatherer process, by
In the switching of variable connector, insertion switch noise, and as variable connector has setup time, adjacent channel signals can be caused
Between interfere.
In order to improve the acquisition quality of signal, notification number of the prior art is 104811200 A of CN, and the day for announcing is
The patent application in July 29 in 2015 improves the quality of signals collecting by the use of unipolarity quadrature square wave as pumping signal.
As existing harvester all adopts analog-digital converter bar none, analog-digital converter is near input limits
When (maximum or minimum amplitude), presence is significantly non-linear, and the analog signal level of particularly input analog-to-digital converter is lower, obtains
The uncertainty of the digital conversion results for arriving is bigger.
Therefore, during using unipolarity quadrature square wave as pumping signal, obtain in the low level part of unipolarity quadrature square wave
The signal to noise ratio of the data signal for arriving is just very low, so as to have impact on the acquisition precision of signal.
Content of the invention
In order to improve deficiency of the prior art, the invention provides a kind of multichannel raises level unipolarity quadrature square wave tune
Signal single channel synchronous acquisition device processed, the present invention is by raising unipolarity quadrature square wave modulated signal, the Yi Jidan of predetermined level
Road ADC realizes the analog-to-digital conversion to multiple signals, and obtains higher precision, described below：
A kind of multichannel raises level unipolarity quadrature square wave modulated signal single channel synchronous acquisition device, and the single channel is synchronously adopted
Acquisition means include：Microprocessor, the single channel synchronous acquisition device also include：At least 2 path switching circuits, adder operation circuit and
Single channel analog-digital converter；
Microprocessor output different frequency and become the orthogonal side of the unipolarity for raising predetermined level of 2 times of ratio
Ripple；
Raise the break-make of unipolarity quadrature square wave control at least 2 path switching circuits of predetermined level, at least 2 tunnel measured signals
Through on-off circuit, the on-off circuit is made up of analog switch and resistance, and the on-off circuit achieves copped wave amplitude modulation；Amplitude modulation
After the signal of different frequency afterwards is added through the adder operation circuit, analog-to-digital conversion is carried out by the single channel analog-digital converter and is obtained
Obtain data signal；
As the unipolarity quadrature square wave signal for driving due to having raised predetermined level, in unipolarity quadrature square wave signal
Low level part, unipolarity quadrature square wave signal improve substantially compared to noise, believe in unipolarity quadrature square wave so as to improve
Number low level section, single channel analog-digital converter carry out the signal to noise ratio that analog-to-digital conversion obtains data signal, so improve be input to micro-
The precision of the data signal in processor；
The microprocessor is processed to data signal, demodulates each measured signal.
Wherein, described as the unipolar signal for driving due to having raised predetermined level, in unipolarity quadrature square wave signal
High level part, improve single channel analog-digital converter carry out analog-to-digital conversion obtain data signal signal to noise ratio.
Wherein, the adder operation circuit is superimposed a predetermined DC voltage.
Wherein, the microprocessor is using any one in MCU, ARM, DSP or FPGA.
Wherein,
Mixed signal is converted into data signal by single channel analog-digital converter and sends into microprocessor；
The unipolarity quadrature square wave driving switch circuit of predetermined level, 4 tunnel measured signals of collection are raised with 4 kinds of frequencies is carried out
Explanation：
The quadrature square wave signal frequency of the microprocessor output control switch circuit be respectively 2 times of f, 2 times of f, 1 times of f, 1
Times f, wherein 90 ° of the phase of same frequency square wave, the sample frequency of single channel analog-digital converter is fs, and fs=8f, and ensure
The high and low level intermediate samples of most high-frequency driving signal；
Sample frequency fSFar above the change frequency of measured signal, on each road of a cycle of minimum driving signal frequency just
Hand over square-wave signal amplitude constant, row operation is entered per 8 data signals as one group with order, tries to achieve the signal width of 4 times of measured signal
Value.
The beneficial effect of technical scheme that the present invention is provided is：The present invention using different frequency and becomes 2 times of ratio
The unipolarity quadrature square wave for raising predetermined level controls the break-make of 2 path switching circuits；The signal of the different frequency after amplitude modulation is through adding
Method computing circuit is added, and plus after a predetermined DC level, carries out analog-to-digital conversion through single channel analog-digital converter and obtain relatively
The data signal of high s/n ratio, and then the precision of the data signal being input in microprocessor is improve, compared to background technology
In notification number be CN 104811200A, the day for announcing is the patent application in July 29 in 2015, invention significantly increases
The signal to noise ratio of the data signal of unipolarity quadrature square wave signal low level section, so as to improve the precision of signals collecting, meets
Multiple needs in practical application.
Description of the drawings
Fig. 1 raises level unipolarity quadrature square wave modulated signal single channel synchronous acquisition dress for a kind of multichannel that the present invention is provided
The structural representation that puts；
The schematic diagram of the unipolarity quadrature square wave for raising predetermined level that Fig. 2 is provided for the present invention；
Fig. 3 raises the single channel synchronous acquisition of level unipolarity quadrature square wave modulated signal for a kind of multichannel that the present invention is provided
The flow chart of the software of device.
In accompanying drawing, the list of parts representated by each label is as follows：
1：On-off circuit； 2：Adder operation circuit；
3：Single channel analog-digital converter； 4：Microprocessor.
Specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, below embodiment of the present invention is made further
Ground is described in detail.
Embodiment 1
A kind of multichannel raises level unipolarity quadrature square wave modulated signal single channel synchronous acquisition device, referring to Fig. 1, the single channel
Synchronous acquisition device includes：At least 2 path switching circuits 1, adder operation circuit 2, single channel analog-digital converter 3 and microprocessor 4,
Microprocessor 4 exports different frequency and becomes the unipolarity quadrature square wave for raising predetermined level of 2 times of ratio, single
The break-make of polarity quadrature square wave control at least 2 path switching circuits 1, N (N>=2) road measured signal is through 1 (switch of on-off circuit
Circuit 1 is made up of resistance and analog switch), on-off circuit 1 is used for realizing copped wave amplitude modulation.The signal warp of the different frequency after amplitude modulation
Adder operation circuit 2 is added, and plus after a predetermined DC level, carries out analog-to-digital conversion by single channel analog-digital converter 3 and obtain
Obtain data signal.Microprocessor 4 is processed to data signal, demodulates each measured signal.
Wherein, the quantity of on-off circuit 2 is more than or equal to 2.When implementing, the quantity of on-off circuit 2 and shape is implemented
Formula is set according to the needs in practical application, and the embodiment of the present invention is without limitation.Microprocessor 1 can using MCU,
Any one in ARM, DSP or FPGA.
Wherein, due to the addition of a predetermined DC level, in the low level part of unipolarity quadrature square wave signal so that
Carry out, through single channel analog-digital converter 3, the data signal that analog-to-digital conversion obtains compared with high s/n ratio, and then improve and be input to microprocessor
The precision of the data signal in device 4.
Further, since raising predetermined level, noise level is not changed in, in the high level portion of unipolarity quadrature square wave signal
Point, unipolarity quadrature square wave signal is also had some improvement compared to noise, improves electricity high in unipolarity quadrature square wave signal
The signal to noise ratio of the signal of flat section.
Further, as single channel analog-digital converter 3 carries out the data signal that analog-to-digital conversion obtains relatively high s/n ratio, and then improve
The precision of the data signal being input in microprocessor 4.
In sum, as the embodiment of the present invention is with respect to the application documents in background technology, considerably improve in list
The signal to noise ratio of the photosignal of polarity quadrature square wave signal low level section, so as to improve the precision of signals collecting, meets reality
Multiple needs in the application of border.
Embodiment 2
A kind of multichannel raises the software approach of level unipolarity quadrature square wave modulated signal single channel synchronous acquisition device, referring to
Fig. 2 and Fig. 3, the method are comprised the following steps：
101：Mixed signal is converted into data signal by single channel analog-digital converter 3 and sends into microprocessor 1；
102：Microprocessor is processed to data signal, demodulates each measured signal.
With the unipolarity quadrature square wave driving switch circuit 2 for raising predetermined level of 4 kinds of frequencies for the sake of concise explanation, adopt
Illustrate as a example by collecting 4 tunnel measured signals, it is assumed that measured signal V1、V2、V3And V4The driving of corresponding switch circuit 1 is raised default
The unipolarity quadrature square wave frequency of level is respectively 2f, 2f, f, f, and V1、V2The driving square wave phase difference of corresponding switch circuit
90 °, V3、V4The driving square wave phase of corresponding switch circuit differs 90 °..
It is assumed that the sample frequency of single channel analog-digital converter 3 is fS, and fS=8f, and ensure in V1In the middle of the high and low level of signal
Sampling.
Digital signal sequencesCan be expressed as：
Wherein,WithSignal V is respectively gathered1、V2、V3And V4Amplitude,For DC component width
Value.
It is assumed that sample frequency fSFar above the change frequency of measured signal, can in a cycle of minimum driving signal frequency
Constant to be approximately considered each road quadrature square wave signal amplitude, by taking most front 8 sampled datas as an example：
Wherein,WithRespectively V1、V2、V3And V4Amplitude with DC component.
In other words, row operation is entered per 8 data signals as one group with order：
4 times of V is obtained1Signal amplitudeAnd completely eliminate DC componentImpact.
4 times of V is obtained2Signal amplitudeAnd completely eliminate DC componentImpact.
4 times of V is obtained3Signal amplitudeAnd completely eliminate DC componentImpact.
4 times of V is obtained4Signal amplitudeAnd completely eliminate DC componentImpact.
To the model of each device in addition to specified otherwise is done, the model of other devices is not limited the embodiment of the present invention,
As long as the device of above-mentioned functions can be completed.
In sum, as the embodiment of the present invention is with respect to the application documents in background technology, considerably improve in list
The signal to noise ratio of the photosignal of polarity quadrature square wave signal low level section, so as to improve the precision of signals collecting, meets reality
Multiple needs in the application of border.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Sequence number is for illustration only, does not represent the quality of embodiment.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement that is made etc., should be included within the scope of the present invention.
Claims (5)
1. a kind of multichannel raises level unipolarity quadrature square wave modulated signal single channel synchronous acquisition device, the single channel synchronous acquisition
Device includes：Microprocessor, the single channel synchronous acquisition device also include：At least 2 path switching circuits, adder operation circuit and list
Road analog-digital converter；Characterized in that,
The microprocessor exports different frequency and becomes the unipolarity quadrature square wave for raising predetermined level of 2 times of ratio；
The break-make of unipolarity quadrature square wave control at least 2 path switching circuits of predetermined level is raised, at least 2 tunnel measured signals are passed through
On-off circuit, the on-off circuit are made up of analog switch and resistance, and the on-off circuit achieves copped wave amplitude modulation；After amplitude modulation
After the signal of different frequency is added through the adder operation circuit, analog-to-digital conversion is carried out by the single channel analog-digital converter and obtains number
Word signal；
As the unipolarity quadrature square wave signal for driving due to having raised predetermined level, in the low electricity of unipolarity quadrature square wave signal
Flat part, unipolarity quadrature square wave signal improve substantially compared to noise, low in unipolarity quadrature square wave signal so as to improve
Level section, single channel analog-digital converter carry out the signal to noise ratio that analog-to-digital conversion obtains data signal, and then improve and be input to microprocessor
The precision of the data signal in device；
The microprocessor is processed to data signal, demodulates each measured signal.
2. a kind of multichannel according to claim 1 raises level unipolarity quadrature square wave modulated signal single channel synchronous acquisition dress
Put, it is characterised in that described as the unipolar signal for driving due to having raised predetermined level, in unipolarity quadrature square wave signal
High level part, improve single channel analog-digital converter carry out analog-to-digital conversion obtain data signal signal to noise ratio.
3. a kind of multichannel according to claim 1 raises level unipolarity quadrature square wave modulated signal single channel synchronous acquisition dress
Put, it is characterised in that the adder operation circuit is superimposed a predetermined DC voltage.
4. a kind of multichannel according to claim 1 raises level unipolarity quadrature square wave modulated signal single channel synchronous acquisition dress
Put, it is characterised in that the microprocessor is using any one in MCU, ARM, DSP or FPGA.
5. a kind of a kind of multichannel for described in any claim in claim 1-4 raises level unipolarity quadrature square wave tune
Signal single channel synchronous acquisition device processed, it is characterised in that
Mixed signal is converted into data signal by single channel analog-digital converter and sends into microprocessor；
The unipolarity quadrature square wave driving switch circuit of predetermined level, 4 tunnel measured signals of collection are raised with 4 kinds of frequencies to be said
Bright：
The quadrature square wave signal frequency of the microprocessor output control switch circuit is respectively 2 times of f, 2 times of f, 1 times of f, 1 times of f,
90 ° of the phase of wherein same frequency square wave, the sample frequency of single channel analog-digital converter is fs, and fs=8f, and ensure in highest
The high and low level intermediate samples of frequency drive signal；
Sample frequency fSFar above the change frequency of measured signal, in the orthogonal side in each road of a cycle of minimum driving signal frequency
Ripple signal amplitude is constant, enters row operation per 8 data signals as one group with order, tries to achieve the signal amplitude of 4 times of measured signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610915149.1A CN106487385A (en) | 2016-10-20 | 2016-10-20 | Multichannel raises level unipolarity quadrature square wave modulated signal single channel synchronous acquisition device |
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| CN201610915149.1A CN106487385A (en) | 2016-10-20 | 2016-10-20 | Multichannel raises level unipolarity quadrature square wave modulated signal single channel synchronous acquisition device |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203970383U (en) * | 2014-05-04 | 2014-12-03 | 山东中医药大学 | A kind of electrocardiogram signal acquisition device |
| CN104811200A (en) * | 2015-04-23 | 2015-07-29 | 天津大学 | Multi-path signal unipolar orthogonal square wave modulated single-path synchronous collection device and method |
-
2016
- 2016-10-20 CN CN201610915149.1A patent/CN106487385A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203970383U (en) * | 2014-05-04 | 2014-12-03 | 山东中医药大学 | A kind of electrocardiogram signal acquisition device |
| CN104811200A (en) * | 2015-04-23 | 2015-07-29 | 天津大学 | Multi-path signal unipolar orthogonal square wave modulated single-path synchronous collection device and method |
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Application publication date: 20170308 |