CN105007080B

CN105007080B - A kind of method that sampling value stabilization is realized in analog-to-digital conversion

Info

Publication number: CN105007080B
Application number: CN201510391533.1A
Authority: CN
Inventors: 俞建定; 汪沁; 王新彪
Original assignee: Ningbo University
Current assignee: Ningbo University
Priority date: 2015-07-01
Filing date: 2015-07-01
Publication date: 2017-10-31
Anticipated expiration: 2035-07-01
Also published as: CN105007080A

Abstract

The invention discloses a kind of method that sampling value stabilization is realized in analog-to-digital conversion, its final sampled value obtained according to the sampled value, the preceding sampled value once read currently read after stable processing and the smooth size in units of the conversion accuracy of AD converter, to obtain the final sampled value that the sampled value currently read is obtained after stable processing；Advantage is that whole process is simple, and can make the sampling value stabilization that finally gives.

Description

A kind of method that sampling value stabilization is realized in analog-to-digital conversion

Technical field

The present invention relates to a kind of Digital Signal Processing, more particularly, to realization sampling value stabilization in a kind of analog-to-digital conversion Method.

Background technology

With developing rapidly and extensive use of the computer in automatic detection and automatic control system for electronic technology, The situation for handling analog signal using electronic system becomes more universal.Handled by digital computer is all discontinuous Data signal, and actually encounter is mostly continuous analog signal, analog signal is the electric signal obtained by sensor, is needed It can be just input in digital computer after analog/digital conversion becomes data signal and be handled and controlled, thus mould Intend the interface circuit that signal is converted into data signal output --- AD converter (ADC) is that analog signal is converted in real world The bridge of data signal, is key and the bottleneck place of electronic technology development.

Because analog signal is consecutive variations, therefore the sampled value that AD converter is obtained in sampling also can be with simulation The change of signal and change, however, because there is quantization error in AD converter, thus obtained sampled value be possible to certain two Change between individual adjacent numerical value, transformation result bounce becomes big.The transformation result that bounce becomes big is likely to affect whole application The stability of system, such as in motor control, the target velocity of motor is changed by potentiometer, if AD converter is obtained The sampled value arrived is unstable, then the target velocity that can directly result in motor is changing always, so that the actual speed of motor can be influenceed Degree.Therefore, it is necessary to study a kind of method of stable sampled value.

The content of the invention

The technical problems to be solved by the invention are to provide a kind of method that sampling value stabilization is realized in analog-to-digital conversion, its mistake Journey is simple, and can make the sampling value stabilization that finally gives.

The present invention solve the technical scheme that is used of above-mentioned technical problem for：Sampling value stabilization is realized in a kind of analog-to-digital conversion Method, it is characterised in that comprise the following steps：

1. the sampled value of AD converter output is read in real time；

2. the ith sample value currently read is defined as current sample values, wherein, i initial value is 1；

3. current sample values are designated as D_{I, reads}, then make D_{I, as a result}Represent D_{I, reads}The final sampling obtained after stable processing Value,Wherein, D_{I-1, as a result}Represent the i-th -1 sampled value read D_{I-1, reads}The final sampled value obtained after stable processing, as i=1 seasons D_{I-1, as a result}=0, Δ D represent turning with AD converter The smooth size that precision is unit is changed, Δ D value is more than 0 and less than or equal to the maximum of AD converter；

4. i=i+1 is made, using the ith sample value currently read as current sample values, step is then back to and 3. continues to hold OK, until all sampled values that AD converter is exported are disposed, all sampled values of AD converter output are so far completed Stable processing, wherein, "=" in i=i+1 is assignment.

Compared with prior art, the advantage of the invention is that：According to the sampled value, the preceding sampling once read currently read Final sampled value and the smooth size in units of the conversion accuracy of AD converter that value is obtained after stable processing, it is possible to The final sampled value that the sampled value currently read is obtained after stable processing is obtained, whole process is simple, and can make final Obtained sampling value stabilization.

Brief description of the drawings

Fig. 1 is the implementation process block diagram of the inventive method.

Embodiment

The present invention is described in further detail below in conjunction with accompanying drawing embodiment.

The method that sampling value stabilization is realized in a kind of analog-to-digital conversion proposed by the present invention, it realizes FB(flow block) such as Fig. 1 institutes Show, it comprises the following steps：

1. the sampled value of AD converter output is read in real time.

2. the ith sample value currently read is defined as current sample values, wherein, i initial value is 1,1≤i≤N, N Total points of AD converter sampling are represented, N=1024 is such as taken.

3. current sample values are designated as D_{I, reads}, then make D_{I, as a result}Represent D_{I, reads}The final sampling obtained after stable processing Value,Wherein, D_{I-1, as a result}Represent the i-th -1 sampled value read D_{I-1, reads}The final sampled value obtained after stable processing, as i=1 seasons D_{I-1, as a result}=0, Δ D are to be to application according to user What the smoothness requirements of system were proposed, Δ D represents the smooth size in units of the conversion accuracy of AD converter, and Δ D value is more than 0 And less than or equal to the maximum of AD converter, explanation is without smoothness requirements during Δ D=0, i.e., the sampled value exported to AD converter Without stable processing.

The sampled value exported using the inventive method to AD converter is handled, it is assumed that the sampled value of AD converter output Respectively 100,100,101,100,99,103,97, and make Δ D=2, then what is obtained after the stable processing of the inventive method is final Sampled value be respectively 100,100,101,101,101,103,99.

Claims

1. the method for sampling value stabilization is realized in a kind of analog-to-digital conversion, it is characterised in that comprise the following steps：

1. the sampled value of AD converter output is read in real time；

3. current sample values are designated as D_{I, reads}, then make D_{I, as a result}Represent D_{I, reads}The final sampled value obtained after stable processing,Wherein, D_{I-1, as a result}Represent the i-th -1 sampled value read D_{I-1, reads}The final sampled value obtained after stable processing, as i=1 seasons D_{I-1, as a result}=0, Δ D represent turning with AD converter The smooth size that precision is unit is changed, Δ D value is more than 0 and less than or equal to the maximum of AD converter；

4. i=i+1 is made, using the ith sample value currently read as current sample values, step is then back to and 3. continues executing with, Until all sampled values that AD converter is exported are disposed, the stabilization of all sampled values of AD converter output is so far completed Processing, wherein, "=" in i=i+1 is assignment.