# Audio Notch Filter

Remove a very narrow frequency band (e.g., hum)

> Canonical page: https://elysiatools.com/en/tools/audio-notch-filter

- **Category:** Media

- **Keywords:** audio, notch, bandreject, hum, filter

## Overview

Uses a narrow bandreject (notch) to cut specific problematic frequencies like 50/60Hz hum or ringing.

## Inputs

- **Audio File** (file): Select an audio file
- **Center Frequency (Hz)** (number): 50 / 60
- **Bandwidth (Hz)** (number): 10
- **Depth (dB, negative)** (number): -30
- **Output Format** (select)

## When to use

- To eliminate 50/60Hz electrical hum from audio recordings.
- When removing unwanted resonant frequencies or ringing sounds.
- For cleaning up audio tracks before editing or distribution to enhance quality.

## How it works

- Upload your audio file in a supported format like MP3, WAV, or AAC.
- Set the center frequency in Hz to target the specific problem band, such as 60Hz for hum.
- Adjust the bandwidth (Hz) to define the width of the frequency range and depth (dB) to control attenuation strength.
- Choose an output format and download the processed audio file.

## Use cases

- Removing background hum from podcast or interview recordings.
- Cleaning up audio in video production to eliminate electrical interference.
- Enhancing music tracks by cutting unwanted resonant frequencies for better sound quality.

## Frequently asked questions

### What audio file formats can I upload?

The tool accepts any audio format supported by your browser, including MP3, WAV, AAC, and others.

### How do I determine the correct center frequency to remove?

Common hum frequencies are 50Hz or 60Hz depending on your region. Use audio analysis software to identify exact frequencies if needed.

### What does the bandwidth setting control?

Bandwidth defines the width of the frequency band around the center that will be attenuated. A narrower bandwidth targets a more specific range.

### Is there a file size limit for uploads?

Yes, the maximum file size is 200MB. Larger files cannot be processed with this tool.

### What output formats are available?

You can choose from MP3, AAC, M4A, OGG Vorbis, Opus, FLAC, or WAV formats.

## Related tools

- [Audio Band-Reject Filter](https://elysiatools.com/en/tools/audio-band-reject-filter): Remove a specific band of frequencies
- [Spectral Denoiser](https://elysiatools.com/en/tools/spectral-denoiser): Reduce broadband noise with a spectral filter chain
- [Audio High-Pass Filter](https://elysiatools.com/en/tools/audio-high-pass-filter): Apply a high-pass filter to remove low frequencies
- [Audio Hum Harmonic Remover](https://elysiatools.com/en/tools/audio-hum-harmonic-remover): Remove 50/60Hz electrical hum and harmonic buzz from audio recordings.
- [Audio Hum Removal](https://elysiatools.com/en/tools/audio-hum-removal): Remove electrical hum (50/60Hz and harmonics) from audio
- [Audio Low-Pass Filter](https://elysiatools.com/en/tools/audio-low-pass-filter): Apply a low-pass filter to remove high frequencies
- [Classroom Recording Cleaner](https://elysiatools.com/en/tools/audio-classroom-recording-cleaner): Clean lecture recordings with speech-focused EQ, hum reduction, peak control, and optional long-silence trimming.
- [Audio Filler Word Removal Map](https://elysiatools.com/en/tools/audio-filler-word-removal-map): Combine a timestamped transcript with the audio to mark filler words (um, uh, 嗯, 那个…) and optionally mute or remove them.

## Samples

- [Copyright-Free FLAC Audio Samples](https://elysiatools.com/en/samples/flac-samples): Lossless FLAC audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
- [Copyright-Free MP3 Audio Samples](https://elysiatools.com/en/samples/mp3-samples): Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio
- [Copyright-Free WAV Audio Samples](https://elysiatools.com/en/samples/wav-samples): Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
- [Copyright-Free Raw PCM Audio Samples](https://elysiatools.com/en/samples/pcm-samples): Raw PCM s16le audio samples featuring nature ambience and relaxing music for waveform, playback, and conversion workflows

## Related content

- [Audio Restoration, Noise Repair, and Cleanup Tools](https://elysiatools.com/en/hubs/audio-restoration-repair-workflows): Diagnose and repair clicks, hum, clipping, crackle, room sound, hiss, and harshness without promising lossless restoration.