Source Code Implementation of DDS Module for Sine Wave Generation

The source code for implementing a DDS module to generate sine waves using the DSP Builder tool in MATLAB is as follows: // Variable declaration float amplitude = 1.0; // Signal amplitude float frequency = 1000; // Frequency in Hz float phase = 0; // Initial phase offset // Parameter calculation float phaseIncrement = 2 * PI * frequency / samplingRate; // Phase increment per sample float currentPhase = 0; // Current phase accumulator value float output = 0; // Output signal value // Sine wave generation loop for (int i = 0; i < numSamples; i++) { output = amplitude * sin(currentPhase + phase); // Calculate instantaneous amplitude currentPhase += phaseIncrement; // Update phase accumulator // Phase wrapping to maintain numerical stability if (currentPhase >= 2 * PI) { currentPhase -= 2 * PI; // Reset phase when exceeding 2π } } // Output the generated sine wave cout << output << endl; This code implements a Direct Digital Synthesis (DDS) module using the DSP Builder tool to generate sine waves. The implementation utilizes key parameters including amplitude, frequency, and phase offset. The core algorithm employs a phase accumulator that increments by a calculated phase step per sample, ensuring precise frequency control. The phase wrapping mechanism maintains numerical stability by preventing accumulator overflow. This MATLAB-based approach provides an effective tool for signal processing applications, offering real-time waveform generation capabilities through efficient iterative computation. The DDS technique demonstrated here is particularly useful for communications systems, test signal generation, and digital signal processing implementations.