Single-Chip Computer Spectral Circuit Design Experiment Report
The following is an example of a single-chip frequency circuit design experiment report: ** 1. Purpose of the experiment ** The purpose of this experiment is to design a spectrum circuit based on a single-chip computer, to realize the analysis and display of the input signal spectrum characteristics, to master the application principle of single-chip computer in spectrum analysis, as well as the design and tuning methods of related circuits. ** 2. Experiment Principle ** 1. ** Basics of Spectral Analysis ** - Spectral analysis was a technique that converted a time-domain signal into a frequency-domain signal to obtain information such as the frequency composition and magnitude of the signal. For a complex periodic signal, it could be decomposed into a series of sinewaves of different frequencies. - In this design, the input signal was processed by a specific circuit module, and then the processed signal was collected and analyzed by the single-chip computer, and finally the frequency spectrum information of the signal was obtained. 2. ** The role of the single-chip processor in the frequency spectrum circuit ** - The single-chip computer was the core of the control system and was responsible for coordinating the work of each circuit module. For example, control the collection of signals, the execution of processing algorithms, and the display of spectrum results. - Choose the appropriate model of the single-chip (such as the STM32F103 single-chip, etc.), which has sufficient processing power, appropriate I/O interface, and rich internal resources (such as timers, ADC, etc.) to meet the design requirements of the spectrum circuit. 3. ** Circuit module composition ** - ** Program Controlled Attenuation module **: For example, the HMC624 and other program controlled Attenuation modules are used to adjust the amplitude of the input signal to adapt to the input range requirements of the subsequent circuit modules. This was because the magnitude of the input signal might vary greatly, and it needed to be weakened to a suitable range to prevent the signal from being saturated or damaging the subsequent circuits. - ** filtering module **: filtering the input signal through a filter to remove unwanted frequency components or noise. According to the design requirements, different types of filter such as low-pass, high-pass, band-pass, or band-stop filter can be selected. - ** Mix module **: Like the ADL5801 Mix module, it will mix the input signal with the signal generated by the local oscillation, and convert the high frequency signal into an intermediate frequency signal. This helped to reduce the frequency of the signal, making it easier for subsequent processing and analysis. - ** Fixed gain amplifier module **: For example, the ADL5611 fixed gain amplifier module can amplify the intermediate-frequency signal after mixing to increase the signal amplitude and meet the requirements of detection and ADC acquisition. - ** Detector module **: The ADC 8310 detector module is used to detect the amplified intermediate frequency signal and convert the AC signal into a direct current signal so that the ADC of the single-chip computer can collect it. - ** Phase-locked loop chip (such as ADF4351)**: It is used to generate the system sweep frequency signal generator to generate a stable local oscillation signal. The output signal frequency range can be set according to the design requirements (such as 35 to 400MHZ). ** 3. Experimental Equipment ** 1. Single-chip development board (including the selected single-chip, such as STM32F103 development board). 2. The circuit modules included a program controlled decay module, a filter module, a frequency mixing module, a fixed gain amplifier module, and a detector module. 3. [Oscillograph: Used to observe the input signal, intermediate signal, and output signal's wave forms, and assist in circuit tuning.] 4. Signal generator: provides input test signals of different frequencies and amplitude. 5. Power supply: provides a stable supply voltage for the entire spectrum circuit. 6. Other auxiliary components, such as resistance, capacity, induction, etc., were used for circuit connection and signal matching. ** 4. Experimental Steps ** 1. ** Circuit Connection ** - According to the circuit diagram, connect each circuit module to the single-chip development board. First, connect the power circuit to ensure that each module is supplied with the appropriate power supply voltage. - Connecting the input and output ports of the program control decay module, connecting the input signal to the program control decay module, and connecting the decayed signal to the filtering module, the frequency mixing module, the fixed gain amplifying module, and the detection module in turn. - The output of the detector module was connected to the ADC pin of the single-chip computer so that the single-chip computer could collect the detected direct current signal. - It is connected to the phase-locked loop chip to provide the local oscillation signal for the mixing module. - The I/O interface of the single-chip computer was used to connect the control signal to the control pins of each circuit module, such as the control pin of the program controlled decay module, the control pin of the phase-locked loop chip, etc. 2. ** Single-chip programming ** - Initialize the system clock, ADC, timer, and other internal resources of the single-chip computer. - Write a program to realize the control logic of the program control decay module, phase-locked loop chip, etc. For example, through the I/O port of the single-chip computer to output control signals, set the decay value of the program controlled decay module, the output frequency of the phase-locked loop chip, and so on. - Write the ADC acquisition program, and set the ADC's parameters such as the frequency and resolution to collect the detected direct current signal. - Realizing the spectrum analysis algorithm. A Fast FT Transform (FFT) algorithm can be used to convert the collected time domain signal into a frequency domain signal to obtain the frequency spectrum information of the signal. - Write a display program to display the spectrum information in a suitable way. For example, a LCD screen could be used to display information such as frequency and spectrum. 3. ** Circuit Testing ** - Observe the input signal's wave form with an earpiece and check whether the frequency and amplitude of the signal meet the design requirements. - After the circuit connection was completed, he gradually powered up each circuit module and observed the output signal wave of each module. For example, observe the filtering effect of the output signal of the filtering module, whether the intermediate frequency signal output by the mixing module is correct, and so on. - To ensure the accuracy of the program, the program could be debugged using a serial port or other means to check the variable values and program execution process during the program operation. - He adjusted the parameters such as the decay value of the programmed decay module and the output frequency of the phase-locked loop chip, observed the changes in the frequency spectrum results, and optimized the performance of the circuit and program. ** 5. Experimental results and analysis ** 1. ** Spectral result displayed ** - Through the LCD screen or other display devices, the frequency spectrum of the input signal was successfully displayed. The frequency spectrum could clearly reflect the frequency components of the signal and its magnitude relationship. For example, for an input signal synthesized by multiple sinewaves of different frequencies, the frequency spectrum could accurately display the frequency peak and the magnitude of each sinewave. 2. ** Accuracy of frequency measurement ** - The accuracy of the measurement of the frequency of the signal by the frequency spectrum circuit was measured by comparing it with the known frequency signal output by the signal generator. The experimental results showed that within a certain frequency range, the spectrum circuit could accurately measure the frequency of the signal, and the error was within an acceptable range (for example, the error was less than 5%). 3. ** Amplitude measurement accuracy ** - Comparing the input signal with a known amplitude, the accuracy of the signal amplitude measurement by the spectrum circuit was analyzed. Due to the influence of various noise and non-linear factors in the circuit, there may be some errors in the amplitude measurement. Through the analysis of the experimental data, it was found that the amplitude measurement error mainly came from the gain error of the programmed decay module, the amplifier module, and the non-linear detector module. ** 6. Experiment summary ** 1. This experiment successfully designed and implemented a frequency spectrum circuit based on a single-chip computer, which could analyze the input signal and display the spectrum results. 2. During the experiment, problems such as circuit connection errors, single-chip program logic errors, signal interference, etc. were encountered. Through careful circuit inspection, program tuning, and some anti-interference measures (such as reasonable wires, adding filter magnets, etc.), these problems were finally solved. 3. The experimental results showed that the frequency measurement and the amplitude measurement were accurate, but there were also some sources of error. In the subsequent improvements, the performance of the spectrum circuit could be improved by selecting higher-precision circuit modules and optimization algorithms. 4. Through this experiment, the core control function of the single-chip computer in the spectrum circuit and the basic principle and implementation method of the spectrum analysis were deeply understood, which laid the foundation for the further development of related electronic circuit design and research. Read more exciting novels for free
A novel similar to the big country's entertainment, recommending girls to cross over
" Entertainment Crown " was a similar novel to " Great Country Entertainment ", but it was not found to be a female transmigration novel. The following are some recommended novels for women's time-travel:" The Sweet Farmer Girl in Space ", where the female protagonist Mo Shunuan transmigrated into a small farmer's girl and became rich after discovering space. She found a partner." The Ghost Doctor: The Silly King Plays the Evil Concubine ", where the female protagonist married the stupid prince after transmigrating, only to find out that the prince was actually a black-bellied person." The girl who transmigrated to my house was actually my mother's best friend." It was a light comedy daily time-travel story. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Ivy League University World Rankings
The following is the world ranking of Ivy League universities in different ranking systems: - ** QQ World Ranking (2024)**: - Harvard University: No specific ranking was mentioned, but it was mentioned in the 2025 QQ World University Rankings Top 100. - Yale University: 18th. - Princeton University: Not mentioned. - University of Pennsylvania: 13th. - Colombia University: Not mentioned. - Brown University: Not mentioned. - Dartmouth College: Not mentioned. - Cornell University: 13th. - ** Times World Ranking (2023)**: - Cornell University: 20th. - **USNews Best University Ranking **: - Princeton University: 1st place. - Harvard University: 2nd place. - Colombia University: 3rd place. - Yale University, 4th. - University of Pennsylvania: 8th. - Dartmouth College: 13th. - Brown University: 14th. - Cornell University: 18th. While waiting for the TV series, he could also read the exciting content related to this site!
What are the fastest coups for pregnant women to cough?
Pregnant women need to be careful when using cough medicine. There is no so-called "fastest" cough medicine, and it is generally not recommended to use medicine for mild coughs. The following are some recommendations for special circumstances: - If the cough symptoms are serious, Chuanbei Pipa Ointment can be used under the guidance of a doctor. It has the effect of clearing heat and dispersing the lung, reducing phlegm and relieving cough. It is used for cough caused by wind-heat invading the lung, phlegm heat internal resistance, yellow phlegm or uncomfortable cough, sore throat, chest tightness and chest distension, etc., but it is not suitable for pregnant women with diabetes during pregnancy. - Juhong Huatan Pill could also be used to relieve cough in pregnant women under the guidance of a doctor. This medicine was an expectorant, which had the effect of converging lung qi, reducing phlegm, relieving cough, and relieving asthma. It had a certain treatment effect on cough, expectoration, wheezing and breathlessness, but its medicinal contraindication was not clear. - In some cases, such as when the illness caused by the flu virus began to worsen, oseltamivir could be used in pregnant women if the benefits outweighed the risks, but it was a Class C drug (the Food and Drug Administration classified pregnant women as safe). - If there were signs of bacteria infection, beta-lactams were relatively safe for pregnant women, fetus, and infants. For example, the common cephem oral drugs cefluraxin, cephem prolene, and cephem dinir were available, but pregnant women should try not to choose amoxicillin-clavulanate. Pregnant women should follow the principle of drug selection when using drugs. Try to choose Grade A and B drugs that do not cause teratogenic effects, use Grade C drugs with caution, and prohibit Grade D and X drugs. Any medication should be consulted with a doctor first and carried out under the guidance of a doctor. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How to write an adventure novel
To write an adventure novel, one could start from the following aspects: [1. Basic elements of adventure mode] 1. ** Protagonist's motivation for adventure **: The protagonist desires adventure itself, not just to find something. His goal is to experience the wonders of the outside world. 2. [Adventurer's Journey: The main character is constantly on an adventure journey, and the entire novel is centered around his adventure.] 3. [Interesting Character: You will encounter various characters in the adventure. Some support the protagonist to become friends, some prevent the protagonist from becoming enemies, and some become friends after being enemies.] 4. ** Various situations **: During the adventure, the protagonist will face danger and surprise. These experiences encourage the protagonist to grow in the joy after dealing with danger and the calmness after surprise. 5. [Adventurer's Reward: The protagonist will gain some benefits in terms of character development, inner change, life comprehension, ability improvement, and personal growth through adventures.] ** 2. Construct the structure of the adventure mode ** 1. ** Act I: Pre-adventure situation ** - It introduced the protagonist's life at the beginning. The protagonist often had many dissatisfaction with the real world, such as a plain life, complicated interpersonal relationships, a treacherous environment, or the constraints of his parents. These dissatisfaction made him unwilling to accept his fate and want to escape from reality and take risks. 2. ** Act Two: Start the adventure ** - It was about the adventure process of the protagonist after leaving the initial life state. In this process, when the protagonist faced a complicated and unfamiliar environment and crowd, he would feel hesitant, confused, lost, excited, hot-blooded, high-spirited, and so on. In the face of difficulties, the protagonist had to use his own abilities and use various resources and opportunities to overcome the difficulties. 3. ** Act Three: The End of the Adventure ** - After the main character experienced hardships, he would either find an ideal new world to start a new life, or return to the place he left. Even if things were the same and people were different, the main character's mental state would change greatly. For example, his heart would become stronger, his character would become more stable, his abilities would be more outstanding, and he would have a new understanding of life and a new evaluation of himself. ** 3. Grasp the key points of the adventure story ** 1. ** Character Change **: The adventure story relies on the charm of the protagonist and his interacting characters, as well as the bizarre experiences of the protagonist to attract people. The protagonist must continue to grow in each adventure. This growth is reflected in the changes in personality, ability, life attitude, life experience, etc., to prevent the plot from being too fragmented and the protagonist from changing. 2. ** In terms of creativity **: It would be better if there were creative ideas that were ahead of the times. Originalities that created writing styles like Ghost Blows Out the Light and Grave Robber's Chronicles could be used as a benchmark. 3. "Conspiracy" setting (for mystery and adventure novels): If it's a mystery and adventure novel, you have to set up a "plot" behind the story that is driven by mysterious forces, logical, and has a large proportion of mysticism. It combines the brain-burning of a mystery novel with the excitement of an adventure novel. 4. ** Culture Matrix (targeted at mystery and adventure games)**: The creation of a "conspiracy" requires a culture matrix. Cultural phenomena such as Xizang, Tantra, and Feng Shui can be used as a culture matrix to generate special explanations and deductions from history and phenomena. 5. ** Material Connection **: When building the framework of the novel, the material must be related and serve the "conspiracy" setting of the entire novel. They must belong to the same system and have logical connections to avoid being written as an independent short story that lacks cohesion. 6. ** Driving Force **: Clearly identify the driving force of the protagonist to take risks. This driving force must be able to convince the readers. It can't be just a simple hobby. It must make the readers feel that the protagonist must take risks. 7. ** Setting up the structure **: This includes the story structure and the character structure. The "plot" of the story structure has to be big enough. If it is related to the great changes in the world or the lifeline of mankind, it will affect the size and level of the audience. The setting of the character structure is also very important. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What are the recommended names of novels related to eternity?
The following are some novels related to "eternity": Eternal Kingdom (Author: Lonely Drifting), Eternal Holy Emperor (Author: Qian Xunyue), Eternal Holy King (Author: Snowy Bow and Sword), Eternal Sword Lord (Author: Get Lost). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reflection on the music lesson plan of the morning exercise for children close to life
The following is a reflection example of a music lesson plan for children's morning exercises: ** I. Reflection on the achievement of teaching objectives ** 1. ** Action Skill Target ** - In the morning exercise music lesson plan for children, it was usually set that the child could follow the rhythm of the music and make the corresponding morning exercise movements. If it was found in teaching practice that most children could accurately keep up with the rhythm, for example, they could quickly make energetic jumping movements in the fast-paced music section, and they could gracefully stretch in the soothing part, it meant that the goal of the movement skill was achieved. However, if some children's movements were not coordinated or always half a beat slower, it might be because their understanding of the music rhythm was not deep enough, or the movements were too difficult for them. This required individual tutoring for these children in the subsequent teaching, such as through simpler rhythm exercises and action breakdown to help them keep up with the rhythm. 2. ** Emotions, attitudes, goals ** - The music lesson plan for morning exercise often hoped to cultivate children's emotional attitudes such as actively participating in morning exercise activities and enjoying music and sports. During the morning exercise, if the children showed excitement and involvement, and actively participated in every segment, then the achievement of the emotional attitude goal was successful. On the other hand, if the children lacked interest, it might be because the music choices were not attractive enough, or the morning exercises were not interesting enough. At this time, it was time to re-examine whether the choice of music was in line with the child's preferences. For example, whether it could incorporate some music that the child was familiar with, such as music that simulated the sounds of small animals for morning exercises, would make the child feel closer. ** 2. Reflection on teaching content ** 1. ** Music selection ** - The music for morning exercises should be simple, cheerful and easy to remember. If the music chosen was too complicated, it would be difficult for the child to understand the rhythm and melody, which would affect the effect of the morning exercise. For example, although some classical music had beautiful melodies, it might be difficult for young children to understand. In contrast, songs like " Health Song " that were related to daily exercise and had a simple and bright rhythm were more suitable. When reflecting, consider whether music can resonate with children and whether it can remind them of happy scenes in life, such as running outdoors and playing with family. 2. ** Action arrangement ** - Morning exercises were based on the child's physical development level and life experience. If the movements included some common movements in children's daily life, such as washing face, brushing teeth, etc., it would be easier for children to accept. However, if the movements are too adult or too difficult, such as complicated dance rotations, the child may feel frustrated because it is difficult to complete. After teaching, they should reflect on whether the arrangement of the movements could be completed easily and happily by the children, and whether it needed to be adjusted according to the actual situation of the children. ** 3. Reflection on teaching methods ** 1. ** Demonstrating Guidance ** - In the morning exercise teaching, the teacher's demonstration was very important. If the teacher's demonstration was accurate and infectious, the child would often imitate it more actively. However, if the teacher's demonstration was not clear enough or did not combine the movements well with the rhythm of the music, the child might have a harder time learning. For example, when demonstrating a jumping action, it was necessary to clearly show that the height and frequency of the jump corresponded to the drum beat in the rhythm of the music. 2. ** Method of interaction ** - Good interaction can improve the enthusiasm of children to participate in morning exercises. For example, in the process of morning exercises, some interaction sessions were set up, such as children imitating each other's actions, teachers and children having simple question-and-answer interactions, etc. If there were fewer interaction segments or poor interaction effects during the teaching process, more interesting interaction methods might be needed, such as group competitions to do morning exercises to see which group did the most neat and creative. This could stimulate children's sense of competition and teamwork, and it was also closer to the characteristics of children's love of games in life. ** 4. Reflection on Teaching Resources ** 1. ** Venues and Equipment ** - If the venue was too narrow or the equipment was not prepared enough, it would affect the development of the morning exercise. For example, in a small space, it was difficult for children to fully stretch their bodies and do morning exercises. If they could use some simple living equipment, such as a small hula hoop as the sun, the children would do morning exercises around the hula hoop, which would increase the fun of morning exercises. When reflecting, you should consider whether the venue is suitable and whether you can use more equipment that is close to life to enrich the content of morning exercises. 2. ** Music Player ** - The sound quality and volume of the music player equipment would also affect the children's feelings towards the music. If the music is too soft or there is noise, the child may not be able to keep up with the rhythm of the music. It was necessary to ensure that the music player could play music clearly and steadily, so that the children could perform morning exercises in a good music environment. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Which Dao do Ghost Immortals belong to?
Ghost Immortal belonged to Taoism and was one of the five immortals in the Taoist "Zhong Lu Dao Chuan Ji." " I Work for Ghost Spirits in the World of Cultivators " is equally exciting. Everyone is welcome to click and read it!
What's the phone number of Zhengfeng Future Center?
The phone number of the sales office of Zhengfeng Future Center was 400 - 176 - 0760 to 719823, and there was another contact number: 4007638577 to 060187. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How to lose weight for sports students
Sports students could start from health guidance and diet precautions. ** 1. Health Guidance ** 1. ** Principle of Energy Balance ** - The core of losing weight was to consume more energy than you consume. To achieve healthy weight loss through diet control and increased exercise, weight loss products should not be advocated. 2. ** Sports ** - Increase the intensity of your cardiovascular exercise, such as walking, brisk walking, jogging, swimming, etc. Moreover, the exercise had to last for more than 30 minutes to burn fat. It could also be combined with traditional Chinese medicine weight loss methods. ** 2. Dietary precautions ** 1. ** Drinks and Snacks ** - You can't drink sweet drinks during the weight loss period. You have to control your mouth and not eat snacks. 2. ** Eating Habits ** - When he was hungry, he could drink some seaweed soup and eat 70% of his meal. The diet should be light, that is, less oil, less salt, and less meat. After eating, one could not lie down or sit immediately. One had to massage the abdomen more, and one could not sit for a long time. 3. ** Energy intake and food selection ** - The total energy intake per day was reduced by 15 - 20% compared to usual. Eat more foods rich in nutritional fiber and low in energy, such as mushrooms, tomatoes, lotus roots, seaweed, milkvetch, bitter gourd, leeks, green tea, kiwifruit, winter melon, black fungus, sea fish, celery, etc., and can't eat supper. The cooking methods were steaming, boiling, and stewing. While waiting for the TV series, he could also read the exciting content related to this site!
Online game female protagonist's luck value is against the sky
The following are some recommendations for novels with female protagonists with heaven-defying luck: - "Zero Degrees Ultimate Fantasy": The female protagonist, Lin Fan, accidentally entered the world's giant online game. She named herself Blue and became a hunter. She had extremely high luck and was lucky in the game. She leveled up quickly, but her simple personality also caused her to encounter many troubles and adventures. - [(System) When Luck Value is Max]: As the biological daughter of the Heavenly Axiom, the female protagonist brought her friends from the countryside to cultivate. Although it is not clear that it is an online game novel, the female protagonist's luck value is off the charts. - "Becoming a Humanoid Koi in the Apocalypse": The female lead, Misty Tea, was recommended by her friend to a large-scale online game. As soon as her character was built, she brought the game shell along with her and transmigrated. There was a certain element of luck. - "The Female Lead Has Koi Luck": The unlucky Jing Xian in her previous life was born with good luck after she was reborn. Although it was not stated that it was an online game novel, this kind of good luck setting met the requirements. For example, she could pick up money, avoid danger, win the big prize, and even meet people who favored her. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>