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Audio Stereo Correlation Meter

Visualize stereo phase correlation for mono compatibility checks

Renders a phase correlation meter image using FFmpeg aphasemeter.

Click to upload file or drag and drop file here

Maximum file size: 200MB Supported formats: audio/*

Key Facts

Category
Media
Input Types
file, text, checkbox, number
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

The Audio Stereo Correlation Meter visualizes phase correlation between stereo audio channels using FFmpeg's aphasemeter, helping you check mono compatibility and identify phasing issues in recordings.

When to Use

  • •When preparing stereo audio for mono playback to ensure no cancellation occurs.
  • •During audio mastering to detect and correct phase problems in mixes.
  • •For analyzing stereo width and balance in music or podcast production workflows.

How It Works

  • •Upload a stereo audio file in a supported format like MP3 or WAV.
  • •Adjust optional parameters such as image dimensions and phase detection settings.
  • •The tool processes the audio with FFmpeg aphasemeter to generate a correlation meter image.
  • •Download the resulting image to visualize phase correlation over time.

Use Cases

Audio engineers verifying mono compatibility before broadcast or streaming.
Podcast producers ensuring voice recordings maintain clarity in mono playback.
Musicians checking stereo mixes for balanced phase correlation during mastering.

Examples

1. Podcast Mono Compatibility Check

Podcast Producer
Background
A producer has a stereo interview recording and needs to ensure it sounds good on mono devices like smart speakers.
Problem
Potential phase issues in the stereo mix could cause voice cancellation when played in mono.
How to Use
Upload the podcast audio file, set image width to 800 and height to 400, and enable phase detection with default settings.
Outcome
The meter image shows positive correlation throughout, confirming mono compatibility for distribution.

2. Music Mix Phase Analysis

Background
A music producer is finalizing a stereo track and wants to visualize phase correlation to optimize the mix.
Problem
Sections with negative correlation might sound thin or hollow in mono playback.
How to Use
Upload the mastered audio, adjust the out-of-phase angle threshold to 160 degrees, and set min phasing duration to 1.5 seconds.
Outcome
The generated image highlights specific timestamps with phase dips, allowing precise adjustments to the stereo field.

Try with Samples

image, audio, barcode
Copyright-Free AAC Audio Samples
High-quality AAC encoded audio samples for testing and development, featuring nature sounds and meditation music with excellent compression
title token audio
audio
Copyright-Free MP3 Audio Samples
Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio
title token audio
audio
Copyright-Free WAV Audio Samples
Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
title token audio
audio
Copyright-Free OGG Vorbis Audio Samples
Open-source OGG Vorbis audio samples for testing and development, featuring excellent compression with nature sounds and meditation music
title token audio
audio

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FAQ

What audio formats are supported?

Common formats like MP3, WAV, FLAC, and others compatible with FFmpeg are supported.

How do I interpret the correlation meter?

Values near +1 indicate good mono compatibility, while values near -1 suggest out-of-phase audio that may cancel in mono.

What does the phase detection overlay show?

It highlights areas with potential phasing issues based on the tolerance and angle threshold settings.

Can I customize the phase detection sensitivity?

Yes, use the 'Mono Detection Tolerance' and 'Out-of-Phase Angle Threshold' options to adjust sensitivity.

What is the 'Min Phasing Duration' used for?

It sets the minimum duration in seconds for flagging phasing issues, ignoring brief fluctuations.

API Documentation

Request Endpoint

POST /en/api/tools/audio-stereo-correlation-meter

Request Parameters

Parameter Name Type Required Description
audioFile file (Upload required) Yes -
width text No -
height text No -
showPhasing checkbox No -
phaseTolerance number No -
phaseAngle number No -
minDuration number No -

File type parameters need to be uploaded first via POST /upload/audio-stereo-correlation-meter to get filePath, then pass filePath to the corresponding file field.

Response Format

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
File: File

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-audio-stereo-correlation-meter": {
      "name": "audio-stereo-correlation-meter",
      "description": "Visualize stereo phase correlation for mono compatibility checks",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=audio-stereo-correlation-meter",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

Supports URL file links or Base64 encoding for file parameters.

If you encounter any issues, please contact us at [email protected]