Equalizer Extension

A comprehensive parametric equalizer extension that provides real-time audio equalization capabilities for modernGraphTool.

Overview

The Equalizer extension adds a full-featured parametric equalizer panel to modernGraphTool, allowing users to apply real-time audio filters to their headphone measurements.

It supports multiple filter types, preamp control, and audio playback with EQ effect applied.

Features

• Parametric EQ: Support for multiple filter types (PEQ, LSQ, HSQ, etc.)
• Real-time Audio: Toggle EQ filters to audio playback in real-time
• Filter Management: Add, remove, and modify EQ bands dynamically
• Phone Selection: Quick selection and switching between different headphone measurements
• Auto EQ Generation: Generate automatic EQ profiles based on target curves
• Import/Export: Support for importing and exporting EQ settings
• File Upload: Upload custom frequency response and target files

Technical Specifications

Property	Value
Extension Name	equalizer
Latest Version	1.1.0
Minimum Core API Level	1
Minimum Core Version	1.0.0
I18N Support	Yes

Configuration

{
  NAME: "equalizer",
  DESCRIPTION: "equalizer panel for modernGraphTool",
  ENABLED: true,
  I18N_ENABLED: true,
  CONFIG: {
    INITIAL_EQ_BANDS: 5,    // Number of Equalizer Bands at start
    MAXIMUM_EQ_BANDS: 20,   // Maximum Number of Equalizer Bands
  },
}

Configuration Options

• INITIAL_EQ_BANDS: Sets the number of EQ bands available when the extension first loads
• MAXIMUM_EQ_BANDS: Defines the maximum number of EQ bands that can be created

Installation

1. Ensure the equalizer folder is present in your extensions directory
2. Add the configuration to extensions/extensions.config.js
3. Enable the extension by setting ENABLED: true
4. Restart modernGraphTool to load the extension

Usage

1. Basic EQ: Use the filter controls to adjust frequency, gain, and Q values
2. Phone Selection: Use the phone selector to switch between different measurements
3. Audio Playback: Enable audio playback to hear EQ changes in real-time
4. Auto EQ: Generate automatic EQ profiles based on selected target curves
5. Import/Export: Save and load EQ settings using the import/export functions

Notes

• The extension requires a modern browser with Web Audio API support for audio features
• Real-time audio processing may cause increased CPU usage
• Large numbers of EQ bands may impact performance on older devices

Events

The extension emits and listens to several custom events:

• equalizer:auto-eq-generated: Fired when auto-EQ is generated (detail: uuid)
• equalizer:filters-changed: Fired when filter values change (detail: filters)
• equalizer:select-changed: Fired when selection changes (detail: type/uuid)
• equalizer:select-removed: Fired when selection is removed