Creating a spectrum analyzer for realtime audio (C++, SDL2, Fast Fourier Transform)

Channel:
Finland Bisqwit
Subscribers:
147,000
Published on ● Video Link: https://www.youtube.com/watch?v=C4tHxouarGc


Game:
Final Fantasy Mystic Quest (1992)
Duration: 0:00
13,189 views
830

In this tool-assisted education video I walk through the creation of a simple spectrum analyzer in C++ from scratch. It records audio in float32 format and uses the Discrete Fourier Transform to translate it into frequency domain. Sample implementations are shown for the Cooley’s&Tukey’s, Bluestein’s and Rader’s Fast Fourier Transforms.
This is based on the ideas I wrote in my master’s thesis (Finnish language) in 2024: https://bisqwit.iki.fi/jutut/masterthesis.pdf

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DOWNLOAD MATERIAL:
https://iki.fi/bisqwit/jkp/fftanalyzer/

Music credits in order of appearance:
Energy Breaker: Heroes’ Adventure (Yukio Nakajima)
Final Fantasy Mystic Quest: Mountain Range of Whirlwinds (Yasuhiro Kawakami, Ryuji Sasai)
All these video game songs have been transformed into OPL3 songs with homebrew tools and played through ADLMIDI.



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Other Statistics

Final Fantasy Mystic Quest Statistics For Bisqwit

At this time, Bisqwit has 159,513 views for Final Fantasy Mystic Quest spread across 3 videos. His channel published less than an hour of Final Fantasy Mystic Quest content, roughly 3.43% of the content that Bisqwit has uploaded to YouTube.