HPR4618: Simple Podcasting - Episode 2 - Basic Filtering

HPR4618: Simple Podcasting - Episode 2 - Basic Filtering

From Hacker Public Radio by Hacker Public Radio

April 15, 2026

About this episode

This episode discusses basic audio filtering techniques for podcasting, including de-essing and normalization.

This show has been flagged as Clean by the host. Basic-Filtering 01 Introduction This is the second episode in a four part series on a simple way to create your own HPR podcast episode. 02 This episode will cover the following topics: Basic filtering.. De-essing to improve voice quality. And normalizing to adjust audio levels for easier reviewing. 03 Filtering is removing unwanted noise from an audio signal. There are several ways of doing this. It is possible to do this with Audacity, but I don't know how so I won't try to describe that method. It is possible however to filter using command line tools such as FFMPEG and Sox. When assembled into shell scripts, these tools can become part of an automated process that you can use over and over again for each HPR episode that you record. 04 In a later episode I will discuss how to analyze audio signals to find the sources of noise that can be reduced or eliminated with filters. In this episode however I will discuss basic filtering that you can apply routinely without doing any analysis beforehand. 05 Sources of Noise A question that you may have is "why is there noise in the recording?" There are many sources of undesirable noise…

Topics covered

  • podcasting
  • audio filtering
  • voice quality
  • noise reduction
  • command line tools
  • automation

Keywords

  • podcasting
  • audio filtering
  • de-essing
  • normalization
  • FFMPEG
  • Sox
  • noise reduction

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