Audio Hum Harmonic Remover

Audio Hum Harmonic Remover | 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, select, number, checkbox
Output type: file
Sample coverage: 4
API ready: Yes

Overview

The Audio Hum Harmonic Remover cleans up audio recordings by targeting and eliminating electrical hum and harmonic buzz caused by ground loops, power supplies, or nearby electrical equipment. By applying narrow notch filters at the mains frequency and its multiples, it surgically removes interference while preserving the natural detail of speech and music.

When to use

When an audio recording has a steady, low-frequency electrical hum from a ground loop or power supply.
When guitar tracks contain high-frequency harmonic buzz captured from single-coil pickups.
When field recordings or interview audio are contaminated by 50Hz or 60Hz mains interference from nearby power grids.

How it works

1Upload your audio file in any supported format.
2Select the mains frequency (50Hz or 60Hz) or enter a custom base frequency.
3Configure the number of harmonics to target, the notch width, and the reduction depth in decibels.
4Process the file to apply the narrow notch cuts and download the cleaned audio in your preferred format.

Use cases

Cleaning up podcast interviews recorded with poorly shielded microphones or USB ground loops.
Removing electrical buzz from electric guitar tracks recorded near computer monitors or fluorescent lights.
Restoring outdoor field recordings captured near power lines, generators, or electrical substations.

Examples

1. Removing Ground Loop Hum from a Podcast

Podcast Editor

Background

An interview was recorded with a USB microphone that captured a persistent 60Hz ground loop hum from the host's laptop charger.

Problem

The background hum is highly audible during quiet moments and distracts listeners.

How to use

Upload the podcast audio file, select 60Hz mains frequency, set harmonics to 8, and keep 'Preserve Bass Body' checked to protect the host's voice.

{
  "mainsFrequency": "60hz",
  "harmonics": 8,
  "reductionDepth": 30,
  "preserveBassBody": true,
  "outputFormat": "wav"
}

Outcome

The 60Hz hum and its harmonic overtones are completely removed, leaving clean, professional-sounding dialogue.

2. Cleaning Guitar Pickup Buzz

Music Producer

Background

A guitar track recorded with single-coil pickups has a sharp, buzzy noise at 50Hz and its upper harmonics due to studio lighting interference.

Problem

The high-frequency buzz ruins the sustain of the guitar notes.

How to use

Upload the guitar WAV file, select 50Hz mains frequency, set harmonics to 12 to catch the upper buzz, and set notch width to 6Hz.

FAQ

What is the difference between this tool and a standard denoiser?

This tool uses narrow notch filters targeting specific harmonic frequencies, preserving surrounding audio details better than broad-band noise reduction.

How do I know whether to choose 50Hz or 60Hz?

Choose 50Hz for recordings made in Europe, Asia, or Africa, and 60Hz for the Americas or Japan, matching the local power grid frequency.

Can I remove hum at a frequency other than 50Hz or 60Hz?

Yes, select the 'Custom Frequency' option and input your specific base frequency between 20Hz and 240Hz.

What does the 'Preserve Bass Body' option do?

It prevents the notch filters from overly thinning out the low-end frequencies of instruments like bass guitars or deep vocals.

What output formats are supported?

You can export your processed audio as MP3, WAV, FLAC, M4A, or OGG.

{
  "mainsFrequency": "50hz",
  "harmonics": 12,
  "notchWidth": 6,
  "reductionDepth": 35,
  "outputFormat": "flac"
}

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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. Removing Ground Loop Hum from a Podcast

2. Cleaning Guitar Pickup Buzz

FAQ

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