This project uses Arduino and four dot matrix screens to realize the visual display of 32-frequency audio (music) spectrum. A lot of space is spent here to explain its principles (it may be slightly difficult for beginners to understand), and a complete schematic diagram and source code are provided. If you like to watch music […]
Tag: frequency
k-Wave丨Photoacoustic imaging simulation丨Definition of Gaussian sensor frequency response + comparison of simulation functions + setting of initial pressure gradient (5)
This article introduces– 1.How to define Gaussian sensor frequency response: How to express the frequency response of a detector (for example: piezoelectric ultrasonic transducer) when the response has a Gaussian shape, based on the example of a homogeneous propagation medium; 2.Comparison of simulated functions: Introducing a brief comparison between the simulated functions “kspaceFirstOrder2D” and “kspaceecondorder”. […]
[Algorithm Challenge] Top K high-frequency elements (including analysis, source code)
347. Top K high-frequency elements https://leetcode-cn.com/problems/top-k-frequent-elements/ 347. Top K high-frequency elements Question description Method 1: Hash table Ideas Complexity analysis code Method 2: Big top pile Ideas Complexity analysis code Method 3: Small top pile Ideas Complexity analysis code Method 4: Quick selection Ideas Complexity analysis code Title description Given a non-empty integer array, return […]
Dual-tone multi-frequency (DTMF) signal detection
GUI page design Enter the “guide” command on the command line, open the GUI panel, and add the required elements according to the experimental requirements (usually ordinary buttons, static text, ordinary text, coordinate charts, radio buttons, etc.) Code: function varargout = EXP1(varargin) % EXP1 MATLAB code for EXP1.fig % EXP1, by itself, creates a new […]
Digital filter analysis—frequency response
Digital filter analysis—frequency response Amplitude, phase, impulse and step response, phase and group delay, zero and pole analysis. Analyze the frequency and time domain response of the filter. Visualize filter poles and zeros in the complex plane. Frequency response Number field freqz uses an FFT-based algorithm to calculate the Z-transform frequency response of a digital […]
5.6 Top K high-frequency elements (LC347-M)
Algorithm: Heap: A heap is a complete binary tree. The value of each node in the tree is not less than (or not greater than) the value of its left and right children. If the father node is greater than or equal to the left and right children, it will be a big top heap, […]
10. Circuit synthesis-wideband matching circuit design method based on simplified real frequency
10. Circuit synthesis-wideband matching circuit design method based on simplified real frequency Chapters 1-9 in the Overview of Network Synthesis and Simplified Real Frequency Theory Learning introduced some basic concepts and experimental methods of SRFT, and finally came to another ultimate use of SRFT, the design of broadband matching circuits. 1. Some previous reviews and […]
Digital signal processing experiment 2: time domain sampling and frequency domain sampling
Experimental content Experimental purpose Time domain sampling theory and frequency domain sampling theory are important theories in digital signal processing. It is required to master the changes in the spectrum of analog signals before and after sampling, and how to choose the sampling frequency so that the sampled signal does not lose information; it is […]
stm32 input capture measures the frequency of pwm wave
1. The concept of input capture In STM32 microcontrollers, input capture is a function used to measure external signal parameters. It is implemented through the timer module and can measure the frequency, duty cycle, pulse width, etc. of the signal. Input capture timer based counter and capture compare unit. When the capture trigger condition is […]
9. Circuit synthesis-microstrip circuit design based on arbitrary amplitude-frequency response of simplified real frequency
9. Circuit synthesis-microstrip circuit design based on arbitrary amplitude-frequency response of simplified real frequency Chapters 1-8 in the Overview of Network Synthesis and Simplified Real Frequency Theory Learning introduced some basic concepts and experimental methods of SRFT, and finally reached the ultimate use of SRFT, which is to directly synthesize a microstrip circuit given any […]