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Audio Spectral Filter

Filter audio based on its spectral content

Applies frequency-domain filtering to shape audio spectrum with surgical precision. Uses FFT-based processing to boost, cut, or notch specific frequency ranges while preserving temporal characteristics. Ideal for spectral enhancement, noise reduction, and creative frequency manipulation.

Click to upload file or drag and drop file here

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

Type of spectral filtering to apply. Each type has different frequency shaping characteristics.

Center frequency for low frequency band adjustments.

-20 -20 20

Gain adjustment for low frequency band. Positive = boost, Negative = cut.

Center frequency for mid frequency band adjustments.

-20 3 20

Gain adjustment for mid frequency band. Positive = boost, Negative = cut.

Center frequency for high frequency band adjustments.

-20 2 20

Gain adjustment for high frequency band. Positive = boost, Negative = cut.

0 0.5 1

How steep the filter transitions are. Higher values = more precise frequency targeting.

0 0.3 1

Adds feedback character to the filter. Higher values = more pronounced filter response.

0 0.85 1

Balance between dry (original) and wet (filtered) signal.

Key Facts

Category
Media
Input Types
file, select, number, range
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

The Audio Spectral Filter shapes audio spectrum with precision using FFT-based frequency-domain processing. It boosts, cuts, or notches specific frequency ranges while preserving temporal characteristics, ideal for spectral enhancement, noise reduction, and creative manipulation.

When to Use

  • •When you need to enhance or reduce specific frequency bands in an audio file for clarity or effect.
  • •For removing unwanted noise, hums, or resonances by targeting their exact frequencies.
  • •To creatively manipulate audio by shaping its spectral content for music production or sound design.

How It Works

  • •Upload an audio file in supported formats like MP3, WAV, or FLAC.
  • •Select a filter type such as spectral enhancement, notch, bandpass, or parametric EQ.
  • •Adjust frequency bands (low, mid, high) with gain controls and set filter sharpness and resonance.
  • •The tool applies FFT-based processing to modify the spectrum and outputs the filtered audio file.

Use Cases

Enhancing vocal clarity in podcast recordings by boosting mid frequencies and cutting low-end rumble.
Reducing background noise in field recordings using notch or bandpass filters to isolate and remove unwanted sounds.
Creating creative audio effects for music by manipulating high and low frequencies with parametric EQ or shelf filters.

Examples

1. Enhancing Podcast Vocals

Podcast Producer
Background
A podcast episode has muffled vocals and low-frequency background noise from recording equipment.
Problem
Vocals lack clarity, and there is audible rumble below 100 Hz.
How to Use
Upload the audio file, select 'Parametric EQ' filter type, boost mid gain around 1000 Hz, and cut low frequencies with a low shelf filter.
Example Config
{ "filterType": "parametric", "midFreq": 1000, "midGain": 5, "lowFreq": 100, "lowGain": -10, "sharpness": 0.7 }
Outcome
Vocals become clearer and more prominent, with reduced rumble, resulting in a professional-sounding podcast.

2. Removing Electrical Hum

Background
An audio recording from a live event has a persistent 60 Hz hum due to electrical interference.
Problem
The constant low-frequency hum distracts from the main audio content.
How to Use
Use the notch filter type, set low frequency to 60 Hz, apply a sharp cut with high sharpness, and adjust resonance for precise removal.
Outcome
The 60 Hz hum is effectively eliminated without affecting the rest of the audio, improving overall quality.

Try with Samples

audio, file
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 can I upload?

You can upload common audio formats including MP3, AAC, M4A, OGG, Opus, FLAC, and WAV.

How does the notch filter work?

The notch filter targets and attenuates a narrow frequency range, useful for removing specific noises like hums or whistles.

Can I adjust how aggressive the filter is?

Yes, use the sharpness slider to control filter transition steepness; higher values mean more precise frequency targeting.

What is the wet/dry mix for?

It balances the original (dry) audio with the processed (wet) signal, allowing you to blend effects subtly.

Is real-time preview available?

No, the tool processes the entire audio file and provides a downloadable output after filtering.

API Documentation

Request Endpoint

POST /en/api/tools/audio-spectral-filter

Request Parameters

Parameter Name Type Required Description
audioFile file (Upload required) Yes -
filterType select No Type of spectral filtering to apply. Each type has different frequency shaping characteristics.
lowFreq number No Center frequency for low frequency band adjustments.
lowGain range No Gain adjustment for low frequency band. Positive = boost, Negative = cut.
midFreq number No Center frequency for mid frequency band adjustments.
midGain range No Gain adjustment for mid frequency band. Positive = boost, Negative = cut.
highFreq number No Center frequency for high frequency band adjustments.
highGain range No Gain adjustment for high frequency band. Positive = boost, Negative = cut.
sharpness range No How steep the filter transitions are. Higher values = more precise frequency targeting.
resonance range No Adds feedback character to the filter. Higher values = more pronounced filter response.
mix range No Balance between dry (original) and wet (filtered) signal.
outputFormat select No -

File type parameters need to be uploaded first via POST /upload/audio-spectral-filter 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-spectral-filter": {
      "name": "audio-spectral-filter",
      "description": "Filter audio based on its spectral content",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=audio-spectral-filter",
      "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]