Arbiträrwellenform-Generator-Software (Arbitrary Waveform Generation (AWG) Software)

Diese Software simuliert einen Arbiträrwellengenerator und ist geschrieben in JavaFX-Programmiersprache.

This software simulates Arbitrary Waveform Generator (AWG) and is written in JavaFX programming language.

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Waveform Generation

• Purpose: Generates the base waveform based on the selected type and parameters.
• Logic:
  • Retrieves parameters from WaveformData, including number of samples, sampling rate, frequency, amplitude, and phase.
  • Iterates over the specified number of samples to compute waveform values at time t = i / samplingRate.
  • Supports multiple waveform types:
    • Sine: Generates a sinusoidal wave using the sine function with the specified frequency and phase.
    • Square: Produces a square wave by determining if the phase is within the duty cycle, outputting high (1) or low (-1).
    • Triangle: Creates a triangular wave using modulo arithmetic to form a linear ramp.
    • Sawtooth: Generates a sawtooth wave with a ramp up/down based on the duty cycle.
    • Custom: Interpolates user-defined points from CSV files or manual canvas drawing.
  • Applies various effects:
    • Jitter: Introduces random time offsets using Gaussian noise to simulate timing imperfections.
    • Frequency Sweep: Adjusts frequency linearly or logarithmically from a start frequency to a stop frequency over a specified duration.
    • Phase Noise: Adds random phase variations to mimic phase instability.
    • Harmonic: Incorporates a second sine wave with user-defined amplitude and frequency.
    • Drift: Scales amplitude linearly over time to simulate signal drift.
    • DC Offset: Adds a constant value to shift the waveform vertically.
    • Burst Mode: Zeros the signal outside the burst duration, defined by the number of cycles and period.
    • Quantization: Rounds values to discrete levels based on the selected resolution (e.g., 8-bit yields 256 levels), with optional quantization noise.
  • Ensures output values are clipped to the range [-1, 1] to prevent clipping artifacts.

Modulation

• Purpose: Applies modulation to the base waveform to simulate communication signals.
• Logic:
  • Processes the generated waveform and applies one of the following modulation types based on user selection:
    • Amplitude Modulation (AM): Multiplies the waveform by a carrier signal scaled by the modulation index.
    • Frequency Modulation (FM): Integrates the waveform to modulate the phase of a carrier signal.
    • Phase Modulation (PM): Uses the waveform to directly modulate the phase of the carrier.
    • Frequency Shift Keying (FSK): Shifts the carrier frequency based on the waveform amplitude.
    • Phase Shift Keying (PSK): Multiplies the waveform by a cosine function of the carrier phase.
    • Quadrature Amplitude Modulation (QAM): Combines in-phase and quadrature signals if I/Q mode is enabled, otherwise passes the waveform unchanged.
  • Uses carrier frequency and modulation index from WaveformData.
  • Returns the modulated waveform, maintaining the same length as the input.

Noise Generation

• Purpose: Adds noise to the waveform to simulate real-world signal imperfections.
• Logic:
  • Generates noise based on the selected noise type and amplitude:
    • White Noise: Produces uniformly distributed random values scaled by the noise amplitude.
    • Gaussian Noise: Generates normally distributed random values for a more natural noise profile.
    • Custom Noise: Interpolates user-defined noise points from imported CSV files, scaled by the amplitude.
  • Adds the generated noise to the waveform, ensuring the combined signal remains within [-1, 1].
  • Skips noise addition if the noise type is "None" or amplitude is zero.

Main Controller

• Purpose: Coordinates user inputs, waveform generation, modulation, noise application, and visualization.
• Logic:
  • Initialization: Sets up UI components (e.g., combo boxes for waveform types, sliders, text fields) and binds them to WaveformData properties for real-time updates.
  • Input Handling: Listens for changes in UI elements, updating WaveformData and triggering waveform updates via a preview mechanism.
  • Debouncing: Employs a 200ms delay using PauseTransition to prevent excessive redraws during rapid input changes.
  • Waveform Generation:
    • Invokes WaveformGenerator to create the base waveform based on the selected type and WaveformData.
    • Applies modulation through ModulationManager if a modulation type other than "None" is selected.
    • Adds noise via NoiseGenerator if noise is enabled and amplitude is positive.
  • Visualization:
    • Draws a grid on the canvas with labeled axes for time and amplitude.
    • Plots the waveform by mapping its values to canvas coordinates, ensuring accurate scaling.
  • Custom Waveforms:
    • Supports importing waveform points from CSV files for custom waveforms.
    • Enables manual waveform drawing on the canvas when the draw toggle is active, storing points for interpolation.
  • Error Handling: Displays alerts for invalid inputs (e.g., negative duration) or processing errors (e.g., CSV parsing failures).

Data Management

• Purpose: Centralizes all simulation parameters in a single model for consistent access.
• Logic:
  • Stores parameters such as sampling rate, number of samples, duration, amplitude, frequency, modulation settings, and noise configurations.
  • Provides getter and setter methods to ensure controlled updates.
  • Maintains relationships between parameters, e.g., updating duration when samples change (duration = samples / samplingRate).

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