Stephen Morris (@stephenm)
Exploring Human Hearing Range
Audacity makes it simple to explore the limits of human hearing by generating and inspecting single-tone audio. This post walks through creating a 9 kHz sine tone, noticing the default 44,100 Hz sample rate, and verifying the result with Audacity's Plot Spectrum tool. Follow the steps and use low playback volume to safely try higher or lower test frequencies yourself.
Digging into an Audio Signal and the DSP Process Pipeline
In this post, I'll look at the benefits of using multiple perspectives when handling signals.A Pre-existing Audio FileLet's say we have an audio file of interest. Let's load it into Audacity and zoom in a little (using View → Zoom → Zoom In, multiple times). The figure illustrates the audio signal: just a basic single-tone signal.
By continuing to zoom into the signal, we eventually get to the point of seeing individual samples as illustrated below. Notice that I've marked one...
A Free DSP Laboratory
You don't need expensive gear to start exploring audio DSP, free open-source tools are enough. This post shows how to build a simple audio DSP laboratory with Audacity, covering signal generation, playback, waveform zooming, exporting to WAV/MP3/OGG, and viewing spectra. It's a short, practical intro to inspecting signals in both time and frequency domains with minimal setup.
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