Hum Removal using Formant Filtering — User Guide

Praat script.

Author: Shai Cohen Affiliation: Department of Music, Bar-Ilan University, Israel Version: 0.1 (2025) License: MIT License Repo: https://github.com/ShaiCohen-ops/Praat-plugin_AudioTools

Contents:

What this does Quick start Parameters Outputs

What this does

Praat script.

Process Description: This script performs noise reduction specifically targeting electrical power line hum and its harmonics. Power line hum is a pervasive form of noise that manifests as a fixed fundamental frequency (either 50 Hz or 60 Hz) and a series of integer multiples (harmonics) of that fundamental. The script removes this noise by applying a series of narrow, high-attenuation band-stop filters (notches), centered precisely on each harmonic up to a user-defined limit.

Quick start

In Praat, select a Sound object.
Run script… → Hum Removal using Formant Filtering.praat.
Set parameters and click OK.
Output object appears (see Outputs).

Parameters (form fields)

Name (GUI)	Type	Default
Base_frequency:	choice	2
Max_harmonic:	integer	8
Bandwidth:	positive	1.5

Outputs

Object name: output
Sample rate: unknown
Normalization: No automatic normalization