What is the effect of the sampling frequency on the digital control system?

Sampling frequency. The high and low have some influence on the digital control system, and the high sampling frequency will have a negative impact on the data collection.

The accuracy increases, but the sampling frequency is high, which will occupy too much CPU time and memory resources, and the sampling frequency is high, and the collected data should be analyzed and processed in real time, and the CPU spends most of its time on data acquisition, analysis and processing, which affects the time for doing other things. If the sampling frequency is low, it is possible that the collected data will not be collected, and the real-time analysis of the data may be incorrect. The sampling frequency must be based on the actual situation and conform to the actual situation.

A hundred years of heaven and earth to return to vitality, unify the mountains and rivers and peace Horizontal criticism: Guotai and the people are safe, one dry and two clean, remove old habits, five stresses, four beautiful trees, and new wind Horizontal criticism: Say goodbye to the old and welcome the spring.

Spring flowers with a smile Firecrackers increase the sound of joy and criticism: Joy and joy Spring flowers with a smile Firecrackers increase the sound of joy and criticism: Joy and joy.

9.The boot is a happy event, say hello to you, the office is smooth, life is high, the lottery is in the middle of the period, good luck is handed over every day, the card field wins, the taste is 2 good, the more you live, the younger you are. A year of good luck with the arrival of spring, the four seasons of colorful clouds rolling in horizontal batches: all the best.

Signal frequency refers to the frequency at which you simulate the signal.

Sampling frequency refers to how many times you collect data in the first second of the morning when you do AD conversion.

There's a sampling theorem here, which is that your sampling frequency must be more than twice the frequency of your signal.

For example, for a 20Hz signal, the sampling frequency must reach at least 40Hz.

The number of sampling points is your sampling frequency multiplied by the sampling time.

What you call a standard signal, I don't know what it is.

Sampling frequency refers to:

The number of points per second that samples an analog signal when a D is sampled.

For example, if you sample an analog continuous signal in a 1-second time period with a sampling frequency of 1m, you will sample a point every 1us on the timeline, then a total of 1m points will be sampled.

The number of sampling points is what is mentioned above, and the number of sampling points can be determined according to the sampling time and sampling frequency.

The relationship between the signal frequency and the sampling frequency needs to satisfy the Nyquist sampling theorem.

That is, the sampling frequency is at least twice the signal frequency, so that it is possible to restore the sampled digital signal to the original analog signal to ensure that the original information of the signal is not lost.

Summary. <>

Hello, dear, I'm glad to have your question, what theorem should be satisfied by the sampling frequency of the digital speed control system, help you find out, bandpass sampling theorem: the spectrum with a signal is in a certain frequency band, not near the zero frequency. And the center frequency of the passband is generally much larger than the bandwidth.

If you sample according to the sampling theorem, the sampling frequency becomes meaningless, I hope mine can help you. Wishing you good health and a happy mood!

What theorem should be satisfied by the sampling frequency of the digital speed control system.

Hello, dear, I'm glad to have your question, what theorem should be satisfied with the sampling frequency of the digital speed control system, help you find out, bandpass sampling theorem: the pure cherry spectrum with a signal is in a certain frequency band, not near the zero frequency. And the center frequency of the high band of the cross-frequency pants is generally much greater than the bandwidth.

If you sample according to the sampling schedule, the sampling frequency will become meaningless, I hope mine can help you. Wishing you good health and a happy mood!

The higher the sampling frequency fs, the denser the sampling point, and the closer the obtained digital letter to the original signal. In order to take into account the amount of computer storage and the amount of computing workload, generally ensure that the signal does not lose or distort the original signal potato information can meet the actual needs.

Summary. The sampling frequency of the digital speed control system should meet the Nyquist theorem, that is, the sampling frequency should be greater than or equal to 2 times of the maximum frequency of the measured signal, so that the signal can be correctly represented and transmitted.

The sampling frequency of the digital speed control system should satisfy the nyquist theorem, and the sampling frequency of the object should be greater than or equal to 2 times of the maximum frequency of the measured signal, so as to correctly represent and transmit the eggplant signal. Hood liquid.

The Nyquist theorem solves the contradiction between the sampling rate and the accuracy of the time-to-shoot space, in other words, it requires that the fastest changing signal of all signals be sampled so that nothing in the signal is lost.

Hello, we are happy to serve you and give you the following answer: if the signal frequency is higher than the sampling rate, it may cause the signal to be distorted, which will affect the accuracy of the signal. One way to solve this problem is to use sampling and resampling techniques.

Sampling and resampling techniques can reduce the frequency of a signal so that it is below the sampling rate. Steps:1

First, a sampler is used to sample the signal to obtain a lower frequency. 2.Then, a resampler is used to resample the sampled signal late to obtain a lower frequency.

3.Finally, a filter is used to filter the resampled signal to obtain a lower frequency. Personal Tips:

Sampling and resampling techniques can effectively reduce the frequency of a signal so that it is below the sampling rate. However, when using this technique, one should pay attention to the degree of distortion of the signal to ensure the accuracy of the signal.

f -- signal frequency.

fs - sampling frequency.

n -- the number of sampling points.

Signal frequency (f):

The signal frequency is the frequency of the signal, which affects the generation function of the signal.

Number of sample points (n):

The number of sampling points is the number of points included in the amount of data sent to the PC at one time, and the number of sampling points determines the amount of data transmitted to the PC each time.

That is, a few points are picked in each cycle. n =t/dt ;dt = 1/fs.

The number of sampling points of FFT and IFFT must be an exponent of 2, and a frequency point in the frequency domain corresponds to a sampling in the time domain, so the number of points of FFT is naturally

Sample rate. The sampling rate determines the accuracy of the sampling.

Sampling Frequency (Hz):

The practice of spacing two adjacent points in a waveform is the reciprocal of the sampling frequency (fs).

The sampling frequency must be greater than the frequency of the signal (without distortion), and the smaller the fs n (frequency resolution), the higher the accuracy, and the FFT accuracy cannot be improved by adding the number of FFT points by adding 0.

Total length of time to generate the signal t = dt * number of samples = number of samples fs

Signal period t = 1 f;

Number of cycles to produce the signal = Total duration t = Total duration Signal frequency = Number of samples Sampling frequency.

Signal frequency. The digital signal processing method of the analog signal is to sample, quantize and encode the analog signal to be processed to form a digital signal, and use the digital signal processing method to process the sampled digital signal.

Graphing: As can be seen from the figure, the more sampling points, the greater the sampling frequency, and the more accurate the sampled signal and the original signal, otherwise the waveform will be distorted.

What is the effect of the sampling frequency on the digital control system?

What is the effect of the sample frequency on the digital control system?

Large-scale, ultra-large-scale programmable logic devices and rolling ridge line EDA (elatronic design autiomation) technology has become the trend of modern digital technology development, in the 90s of the 20th century, the fastest growing industry in the integrated circuit industry sales is field programmable logic integrated circuits. HDL is ideal for programmable logic applications. Especially in the application design of high-volume CPLD and FPGA, it is difficult to complete quickly and efficiently if the previous Boolean equations or gate-level descriptions are used.

VHDL provides a high-level language structure to easily describe large circuits and complete designs quickly. It supports the creation of a library of design cells to store components that are reused in the design. It is a standard language whose design descriptions can be supported by different tools and implemented with different devices.

The design method of the VHDL language is a high-level design method, also known as the system-level design method, and its design steps are as follows:

1) Systematic division according to the "top-down" design method.

2) Enter the VHDL language**.

3) Compile the above design input into a standard VHDL file.

4) Use the synthesizer to comprehensively optimize the VHDL source** and generate a gate-level description of the netlist file.

The digital electronic password lock is mainly composed of three parts: the keyboard interface circuit, the control circuit of the electronic password lock, the output of the seven-segment display electric field front road, and then the auxiliary corresponding peripheral circuit can realize the complete electronic password lock function.

The design of this time is mainly to design the control circuit of the electronic password lock, the output of the seven-segment display circuit, and then assist the corresponding peripheral circuit, because the keyboard interface circuit is more complex, I can only simply design some ideas.

2.Overview of digital electronic combination locks.

The function of a digital electronic combination lock.

The power supply used by this digital electronic password lock is positive 5V direct current, and the original clock frequency used is 4MHz. It has the following features:

Digital input: Each time a number key is pressed, a value is entered and displayed on the far right of the display, and the previously entered data is moved to the left by one digit in order.

Digital Clear: Press this key to clear all previous input values, clearing to "0000".

Password setting: When you press this key, the current number will be set to a new password.

Release password: When pressing this key, the current unlock code will be compared with the set password, and if it is consistent, the corresponding unlocking signal can be obtained.

Master Control Electric Lock: Press this key to lock the combination lock.

System alarm: After the unlocking fails three times, the system alarms when the fourth unlocking is done.

Schema structure. How it works.