Audio Stereo Correlation Meter

Audio Stereo Correlation Meter | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

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

1Upload a stereo audio file in a supported format like MP3 or WAV.
2Adjust optional parameters such as image dimensions and phase detection settings.
3The tool processes the audio with FFmpeg aphasemeter to generate a correlation meter image.
4Download 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.

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.

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Podcast Mono Compatibility Check

2. Music Mix Phase Analysis

FAQ

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