DCOffsetter - DC Offset Audio Plugin

May 5, 2026 · View on GitHub

License Framework

Overview

DCOffsetter is an audio plugin developed with the JUCE framework. It allows you to adjust the direct current (DC) component of audio signals by adding DC offset (bias) to the audio signal.

It provides independent bias control for left and right stereo channels, supporting various audio processing applications from fine adjustments to significant modifications.

GUI Preview

DCOffsetter GUI

Features

Core Features

  • Stereo DC Offset Control: Set independent bias values for the left (L Bias) and right (R Bias) channels
  • Smooth Parameter Changes: Smooth parameter transitions using SmoothedValue
  • Real-time Processing: Low-latency audio processing

Parameters

ParameterRangeDefaultDescription
L Bias-1.0 to 1.00.0Left channel DC offset value
R Bias-1.0 to 1.00.0Right channel DC offset value

Project Structure

DCOffsetter/
├── Source/
│   ├── PluginProcessor.h/cpp       # Audio processor implementation
│   ├── PluginEditor.h/cpp          # Editor UI implementation
│   ├── DSP/
│   │   └── DCOffsetProcessor.h/cpp # DC offset processing engine
│   ├── Parameters/
│   │   └── PluginParameters.h      # Parameter definitions
│   └── LookAndFeel/
│       └── CustomLooks.h/cpp       # Custom UI styling
├── JuceLibraryCode/                # JUCE framework code
├── Builds/
│   └── VisualStudio2026/           # Visual Studio project
├── DCOffsetter.jucer               # JUCE project configuration file
└── README.md                       # This file

Building

Prerequisites

  • JUCE 8.0 or later
  • Visual Studio 2022 or 2026 (for Windows)

Building with Visual Studio

  1. Open the DCOffsetter.jucer file with JUCE Projucer
  2. Select the build target (VST3, AAX, Standalone, etc.)
  3. Open the solution file in Builds/VisualStudio2026/ folder
  4. Build with Visual Studio

Configuration with JUCE Projucer

Open DCOffsetter.jucer with Projucer to configure:

  • Plugin formats (VST3, AAX, AU, LV2, etc.)
  • Target platform
  • Compiler settings

Usage

Basic Operation

  1. Insert the plugin in your DAW (Digital Audio Workstation)
  2. Set the left channel DC offset using the L Bias slider
  3. Set the right channel DC offset using the R Bias slider

Typical Use Cases

  • Signal DC Component Adjustment: Center audio signals as a preprocessing step
  • Waveform Shaping: Prepare input for non-linear processing
  • Troubleshooting: Correct recording material containing DC offset artifacts

Architecture

Data Flow

Input Audio
    ↓
[PluginProcessor::processBlock]
    ↓
[DCOffsetProcessor::process] (L Channel)
[DCOffsetProcessor::process] (R Channel)
    ↓
Output Audio

Key Classes

DCOffsetProcessor

  • Role: Implements DC offset processing
  • Methods:
    • prepare(): Initializes the audio system
    • setDCOffset(): Sets the bias value
    • process(): Applies bias to audio buffer
    • reset(): Resets internal state

DCOffsetterAudioProcessor

  • Role: Implements JUCE AudioProcessor interface
  • Functions: Parameter management, audio processing flow control

DCOffsetterAudioProcessorEditor

  • Role: User interface implementation
  • Features: 320x220 pixel custom editor layout

Parameter Details

Smooth Transitions with SmoothedValue

Bias values are smoothly changed using juce::SmoothedValue, which prevents clicking artifacts when parameters are changed.

juce::SmoothedValue<float> dcOffset{0.0f};

License

For details, see the LICENSE file.

Development Information

Supported Formats

  • VST3 (Windows, macOS, Linux)
  • AAX (Windows, macOS)
  • AU (macOS)
  • LV2 (Linux)
  • Standalone (executable application)

Supported Platforms

  • Windows: 64-bit (recommended)
  • macOS: 10.11 or later
  • Linux: ALSA/JACK support

Troubleshooting

Build errors occur

  1. Verify that the JUCE library is installed correctly
  2. Ensure Visual Studio is up to date
  3. Delete the Builds/ folder and regenerate from Projucer

Last Updated: May 2026