CN201754578U - Analogue signal sampling device - Google Patents
Analogue signal sampling device Download PDFInfo
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- CN201754578U CN201754578U CN2010202497425U CN201020249742U CN201754578U CN 201754578 U CN201754578 U CN 201754578U CN 2010202497425 U CN2010202497425 U CN 2010202497425U CN 201020249742 U CN201020249742 U CN 201020249742U CN 201754578 U CN201754578 U CN 201754578U
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- analog signal
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- electrically connected
- sampling device
- analogue
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Abstract
The utility model provides an analogue signal sampling device, which comprises a first AD conversion unit, an analogue signal generating unit, a detecting unit and a signal processing unit. The first AD conversion unit is used for sampling analogue signals, the detecting unit is used for detecting change rates of the analogue signals, and the signal processing unit is used for fitting the analogue signals according to sampled values of the first AD conversion unit and the change rates of the analogue signal. An input end of the signal processing unit is respectively electrically connected with the detecting unit and an output end of the first AD conversion unit, and the analogue signal generating unit is respectively electrically connected with the first AD conversion unit and an input end of the detecting unit. When fitting the analogue signals, the analogue signal sampling device can estimate the change trend of the analogue signals by the aid of analogue signal change rate parameters, and fit the analogue signals according to the change trend, and accordingly greatly reduces the distortion factor of the analogue signals, and leads fitted analogue signals to be closer to actual waveform and smaller in distortion factor.
Description
Technical field
The utility model relates to a kind of sampling apparatus, especially sampling device for analog signal.
Background technology
In the design of electronic product and test, use, a lot of situations need be measured the continuous analog signal of product itself or extraneous input, processing and match reproduction, even some occasions also need some waveforms are shown, but development along with electronic product, the waveform frequency of being imported is more and more higher, and the sample rate that analog quantity-digital quantity conversion equipment itself exists and the mutual inhibition of sampling precision, thereby caused the match reproduction of waveform to have certain error generation.The error that produces and the frequency of sampling and precision have directly gets in touch, and the processing policy of software also will influence to some extent simultaneously.Mostly existing processing mode is according to the application scenario, to sacrifice a raising that exchanges another in sample frequency and the precision, causes the bigger distortion of sample waveform so the most at last.
The utility model content
The utility model is the contradiction of sample frequency and precision in the solution prior art, and the bigger technical problem of the analog signal distortion factor that simulates provides a kind of sampling device for analog signal that simulates the less analog signal of the distortion factor.
The utility model provides a kind of sampling device for analog signal, comprise the AD converting unit and the analog signal generating unit that are used for the analog signal sampling, sampling device for analog signal also comprises the detecting unit of the rate of change that is used to detect analog signal, and the signal processing unit that is used for carrying out the described analog signal of match according to the rate of change of the sampled value of a described AD converting unit and analog signal, described signal processing unit input is electrically connected with the output of a described detecting unit and a described AD converting unit respectively, and described analog signal generating unit is electrically connected with the input of a described AD converting unit and described detecting unit respectively.
Further improve, described detecting unit comprises differential circuit and the 2nd AD converting unit, the input of described differential circuit is electrically connected with analog signal ripple generating unit output, and the output of described differential circuit is electrically connected with described signal processing unit input by described the 2nd AD converting unit.
Further improve, described differential circuit comprises capacitor C, resistance R 1, resistance R 2 and operational amplifier, the in-phase input end of described operational amplifier is electrically connected with resistance R 1, capacitor C respectively, the other end of resistance R 1 is electrically connected with the output of described operational amplifier, the inverting input of described operational amplifier is electrically connected with resistance R 2, the other end ground connection of resistance R 2.
Further improve, a described AD converting unit is identical with the resolution of the 2nd AD converting unit.
Further improve, described signal processing unit is the MC9S08DZ60 chip.
The utility model is compared with prior art, owing to increased the detecting unit that is used to detect the analog signal rate of change, when the described analog signal of match, can pass through analog signal rate of change parameter prediction analog signal variation tendency, and according to the described analog signal of variation tendency match, this has greatly reduced the distortion factor of analog signal, make the more approaching real waveform of analog signal of match, the distortion factor is little.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of sampling device for analog signal of providing of the utility model;
Fig. 2 is the circuit diagram of a kind of embodiment of the differential circuit that provides of the utility model;
Fig. 3 is the schematic diagram of match analog signal in the prior art;
Fig. 4 is the schematic diagram of the sampling device for analog signal match analog signal that provides of the utility model.
Embodiment
Clearer for technical problem, technical scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
According to a kind of execution mode of the present utility model, as Fig. 1, shown in Figure 2, a kind of sampling device for analog signal, comprise the AD converting unit and the analog signal generating unit that are used for the analog signal sampling, wherein sampling device for analog signal also comprises the detecting unit of the rate of change that is used to detect analog signal, and the signal processing unit that is used for carrying out the described analog signal of match according to the rate of change of the sampled value of a described AD converting unit and analog signal, described signal processing unit input is electrically connected with the output of a described detecting unit and a described AD converting unit respectively, and described analog signal generating unit is electrically connected with the input of a described AD converting unit and described detecting unit respectively.
Wherein, described detecting unit comprises differential circuit and the 2nd AD converting unit, the input of described differential circuit is electrically connected with described analog signal output, the output of described differential circuit is electrically connected with described signal processing unit input by described second converting unit, in the present embodiment, differential circuit adopts RC and operational amplifier to constitute, referring to Fig. 2, described differential circuit comprises capacitor C, resistance R 1, resistance R 2 and operational amplifier, the in-phase input end of described operational amplifier respectively with resistance R 1, capacitor C is electrically connected, the other end of resistance R 1 is electrically connected with the output of described operational amplifier, the inverting input of described operational amplifier is electrically connected with resistance R 2, the other end ground connection of resistance R 2, the other end of described electric capacity is electrically connected with the output of described analog signal generating unit, and the input of described the 2nd AD converting unit is electrically connected with the output of described operational amplifier.
Wherein, described detecting unit also can be by sample frequency than twice at least the 2nd AD converting unit of a described AD converting unit, described the 2nd AD converting unit is the rate of change that the preceding point of basic point and basic point calculates a described AD converting unit sampled point with the sampled point of a described AD converting unit; Detecting unit specifically to constitute the technical staff known, just do not giving unnecessary details at this.
Further improve, a described AD converting unit is identical with the resolution of the 2nd AD converting unit, and equated to the change-over time of a described AD converting unit and the 2nd AD conversion, also is convenient to signal processing unit processes.
In the present embodiment, described signal processing unit is the MC9S08DZ60 chip.
Referring to Fig. 3, in the prior art, signal processing unit is only according to the signal of a described AD converting unit, it is the sampled value of analog signal, with time is X-axis, and the sampled value of analog signal is a Y-axis, draws the discrete figure of sampled point on coordinate plane, again adjacent 2 are connected by straight line, simulate analog signal, each sampled point A, B, C, D etc. among Fig. 3 are linked to each other with straight line, when handling like this, if sample frequency is low, then the waveform distortion that comes out of match is bigger.
Referring to Fig. 4, in the utility model, described signal processing unit is according to the signal of a described AD converting unit and detecting unit, be the sampled value of analog signal and the slope of this sampled point, and slope is this sampled point rate of change, be X-axis equally with time, the analog signal sampled value is a Y-axis, draws the discrete figure of sampled point on coordinate plane, and each sampled point extends towards slope direction, will intersect between neighbouring sample point, form intersection point, at this moment each sampled point has just formed continuous waveform, obtains the match waveform, each sampled point A, B, C, the variation tendency match waveform of reference waveform between the D etc., the distortion factor is little.
Be compared with existing technology, owing to increased the detecting unit for detection of the analog signal rate of change, when the described analog signal of match, can pass through analog signal rate of change parameter prediction analog signal variation tendency, and according to the described analog signal of variation tendency match, this has greatly reduced the distortion factor of analog signal, make the analog signal of match more near real waveform, the distortion factor is little.
All any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (5)
1. sampling device for analog signal, comprise the AD converting unit and the analog signal generating unit that are used for the analog signal sampling, it is characterized in that: sampling device for analog signal also comprises the detecting unit of the rate of change that is used to detect analog signal, and the signal processing unit that is used for carrying out the described analog signal of match according to the rate of change of the sampled value of a described AD converting unit and analog signal, described signal processing unit input is electrically connected with the output of a described detecting unit and a described AD converting unit respectively, and described analog signal generating unit is electrically connected with the input of a described AD converting unit and described detecting unit respectively.
2. sampling device for analog signal as claimed in claim 1, it is characterized in that: described detecting unit comprises differential circuit and the 2nd AD converting unit, the input of described differential circuit is electrically connected with analog signal generating unit output, and the output of described differential circuit is electrically connected with described signal processing unit input by described the 2nd AD converting unit.
3. sampling device for analog signal as claimed in claim 2, it is characterized in that: described differential circuit comprises capacitor C, resistance R 1, resistance R 2 and operational amplifier, the in-phase input end of described operational amplifier is electrically connected with resistance R 1, capacitor C respectively, the other end of resistance R 1 is electrically connected with the output of described operational amplifier, the inverting input of described operational amplifier is electrically connected with resistance R 2, the other end ground connection of resistance R 2.
4. sampling device for analog signal as claimed in claim 2 is characterized in that: a described AD converting unit is identical with the resolution of the 2nd AD converting unit.
5. sampling device for analog signal as claimed in claim 1 is characterized in that: described signal processing unit is the MC9S08DZ60 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202497425U CN201754578U (en) | 2010-06-30 | 2010-06-30 | Analogue signal sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202497425U CN201754578U (en) | 2010-06-30 | 2010-06-30 | Analogue signal sampling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201754578U true CN201754578U (en) | 2011-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202497425U Expired - Lifetime CN201754578U (en) | 2010-06-30 | 2010-06-30 | Analogue signal sampling device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107707259A (en) * | 2017-11-01 | 2018-02-16 | 兰州大学 | A kind of method of analog signal sampling and reconstruct |
-
2010
- 2010-06-30 CN CN2010202497425U patent/CN201754578U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107707259A (en) * | 2017-11-01 | 2018-02-16 | 兰州大学 | A kind of method of analog signal sampling and reconstruct |
| CN107707259B (en) * | 2017-11-01 | 2020-11-03 | 兰州大学 | Method for sampling and reconstructing analog signal |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110302 |
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| CX01 | Expiry of patent term |