Signal Processing: Convolution, DFT, Filters, and Signals
Linear and Circular Convolution Using Circshift
This section demonstrates linear and circular convolution using the circshift function in MATLAB.
clc;
clear all;
close all;
x = [1 2 3];
h = [4 5];
L = length(x);
M = length(h);
N = L + M - 1;
x_padded = [x, zeros(1, N - L)];
h_padded = [h, zeros(1, N - M)];
for i = 1:N
c = circshift(h_padded', i - 1);
d(:, i) = c;
end
o = d * x_padded.';
disp('Linear convolution without function');
disp(o');
subplot(3, 1, 1);
stem(x, '*');
xlabel('n');
ylabel(Network Configuration and Troubleshooting: Key Considerations
Network Configuration and Troubleshooting
Area Configuration
- Area 1 Stub Area: No summaries.
- Create 2 areas, but do not connect to Area 0.
- The area range is incorrect; SW1 is missing SW2.
RADIUS and Authentication
- RADIUS MAC-Auth Guest Ports: Enable ACL grouping and apply shared ACL.
- Enable dynamic authentication with RADIUS server settings.
- RADIUS MAC-Auth should enable guest ports.
- Permit/Allow all MAC-Auth ClearPass portal.
- Role-based tunnel – RADIUS server such as ClearPass.
- Granular control of authentication
Understanding USB Technology: Architecture, Devices, and Communication
USB: Simplified PC Connectivity
The Universal Serial Bus (USB) was created to simplify and improve the connection of peripherals to PCs, offering a standardized and versatile interface.
Key Objectives of USB
- Provide sufficient bandwidth for a wide range of devices.
- Maintain a low-cost standard.
- Enable Plug and Play functionality.
USB Architecture
USB architecture can be divided into three main areas:
1. USB Interconnection/Topology
The USB interconnection is structured in a tiered-star topology with up to
Read MoreComputer Networks: Topologies, Architectures, and Protocols
Network Topologies
Network topologies refer to the layout or arrangement of different elements (links, nodes, etc.) in a computer network. The main types of network topologies include:
Bus Topology: All devices share a single communication line or cable. It is easy to install but can be slow and prone to collisions as network traffic increases.
Ring Topology: Each device is connected to two other devices, forming a circular pathway for signals. Data travels in one direction, reducing collision risks
Network Media, Coding, Topology, and Ethernet Standards
Media Transmission
Wired (transmission signals via electricity):
- Balanced (2 conductors; if there is interference, the difference is used).
- Unbalanced (the modified signal is received).
Types of Wired Media:
- Stranded: 4 twisted pairs.
- UTP (Unshielded Twisted Pair) (digital): Twisted pairs.
- FTP (Foiled Twisted Pair) (digital): 4 twisted pairs with a mesh around them.
- STP (Shielded Twisted Pair) (digital): Shielding on each pair and all pairs.
- Coaxial (analog & digital): Central core conductor (copper)
ZeroMQ in Node.js: Examples & Patterns
ZeroMQ in Node.js: Practical Examples
This document provides practical examples of using ZeroMQ (zeromq) in Node.js. It covers several common messaging patterns, including Publish/Subscribe, Push/Pull, Router/Dealer, and Request/Reply. Each example is presented with corrected code and explanations.
Publish/Subscribe Pattern (Pub/Sub)
This example demonstrates a publisher sending messages on different topics, and a subscriber listening to a specific topic (“Politica”).
const zmq = require('zeromq') Read More