Spectral Denoiser

Spectral Denoiser | 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, number, checkbox, select
Output type: file
Sample coverage: 4
API ready: Yes

Overview

The Spectral Denoiser is an audio processing tool designed to clean up broadband noise using a precise FFmpeg filter chain. By combining high-pass and low-pass cuts, the afftdn spectral denoiser, optional hum removal, and limiter protection, it effectively reduces background hiss, hums, and rumble without relying on unpredictable AI models.

When to use

When you need to clean up background hiss, static, or hum from voice recordings, podcasts, or interviews.
When you want to apply precise high-pass and low-pass filters to eliminate low-frequency rumble or high-frequency noise.
When you need a reliable, non-destructive spectral noise reduction tool that preserves vocal clarity and prevents clipping.

How it works

1Upload your audio file and set the desired noise reduction level in decibels.
2Configure the low-cut and high-cut frequency thresholds to filter out unwanted low-end rumble and high-end hiss.
3Enable optional settings like hum removal to target electrical interference, and choose your preferred output format such as WAV, FLAC, or MP3.

Use cases

Cleaning up podcast episodes recorded in non-acoustic environments with noticeable background hiss.
Removing low-frequency air conditioning rumble and electrical hum from voiceover tracks.
Restoring archival audio recordings by filtering out tape hiss and high-frequency static.

Examples

1. Cleaning a Podcast Interview

Podcast Producer

Background

A producer has an interview recording with a persistent background hiss from a cheap microphone preamp.

Problem

The hiss distracts from the speaker's voice, and simple volume adjustments do not fix it.

How to use

Upload the audio file, set Noise Reduction to 20, enable Preserve Voice, and select MP3 as the output format.

{"noiseReduction": 20, "lowCutHz": 80, "highCutHz": 15000, "deHum": true, "preserveVoice": true, "outputFormat": "mp3"}

Outcome

The background hiss is significantly reduced while the speaker's voice remains clear and natural.

2. Removing AC Hum from Voiceover

Voice Actor

Background

A voice actor recorded a demo in a home studio, but the microphone picked up a low-frequency hum from the air conditioning unit.

Problem

The low-frequency rumble ruins the professional quality of the voiceover.

How to use

Upload the WAV file, set the Low Cut to 100 Hz to filter out the rumble, check the Remove Hum box, and export as WAV.

FAQ

What audio formats are supported for output?

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

How does the 'Preserve Voice' option work?

It optimizes the spectral filter chain to protect human speech frequencies, preventing vocal distortion during noise reduction.

What is the maximum file size I can upload?

The tool supports audio files up to 100 MB in size.

What does the 'Remove Hum' option do?

It targets and filters out constant low-frequency electrical hums, typically caused by power grids or ground loops.

How does the spectral denoiser reduce noise without AI?

It uses FFmpeg's afftdn filter, which analyzes the audio spectrum to isolate and attenuate steady broadband noise.

{"noiseReduction": 15, "lowCutHz": 100, "highCutHz": 18000, "deHum": true, "preserveVoice": true, "outputFormat": "wav"}

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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. Cleaning a Podcast Interview

2. Removing AC Hum from Voiceover

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