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Spectrum Analyzer

By: pqyt

foo_vis_spectrum_analyzer is a foobar2000 component that implements a spectrum analyzer panel.

It is an attempt to recreate the foo_musical_spectrum component by fismineur and the Audio Spectrum project for foobar2000 64-bit.

Features

Fast Fourier (FFT), Constant-Q (CQT), Sliding Windowed Infinite Fourier (SWIFT) and Analog-style transforms
Multiple frequency range and smoothing options
Multiple graphs
Styling of all visual elements
Artwork background and color extraction
Supports Default (DUI) and Columns (CUI) user interface
Uses DirectX rendering.
Supports foobar2000 2.0 and later (32-bit and 64-bit version)

Requirements

Tested on Microsoft Windows 10 and later.
foobar2000 v2.0 or later (32-or 64-bit).

Current version: 0.12.0.0, released on 2026-09-11

Download

Change log:

New: You can downmix the input of the oscilloscope to mono.
New: [url=https://research.google/blog/turbo-an-improved-rainbow-colormap-for-visualization/]Turbo[/url] and a couple of Perceptually Uniform Sequential [url=https://matplotlib.org/stable/users/explain/colors/colormaps.html]Matplotlib[/url] color maps.
New: Mel scale frequency distribution.
New: A spectrogram color legend can be enabled in the configuration dialog.
New: Lanczos and 4-term Blackman-Harris window function.
- The latter produces very clean peaks with minimal leakage from strong tones into neighboring bins.
New: Option to render the window function and weighing function over the spectrum.
- Only useful to see the shape of both functions.
New: Zero-crossing trigger for the oscilloscope. Best used with non-music signals such as those generated by [url=https://github.com/stuerp/foo_input_signal]foo_input_signal[/url].
Improved: Visualizations continue without interruption when starting a new track.
Improved: Performance and numeric stability of the CQT transform.
Improved: Downsampling of the oscilloscope input should now retain more peak values and produce better representation of large input audio chunks.
Improved: Tweaked the behavior of the visualizations when changing tracks. They no longer fully reset.
Improved: Overall code hardening and cleanup.
Improved: Optimized the FFT analyzer and improved all coefficient mapping modes.
Improved: Cleaned up the rough edges of the spectrogram.
Improved: Minor redesign of the Graphs page to make the spectrogram easier to configure.
- Left/Right and Top/Bottom axis should be more consistent for a horizontal or vertical spectrogram.
Changed: Peak values continue to animate when the parent window is minimized.
Changed: Made the CPU/GPU use optimization logic less invasive when the visualization is hidden or minimized to react more predictable to track changes and the end of a playlist.
Changed: Component group on the Common settings page is now called Diagnostics.
Breaking Change: The peak hold time and fall rate (was Acceleration) are now expressed in seconds and dB/s respectively to make them independent of the frame rate. The old values will be remapped to the new ranges but some tweaking may be necessary.
Breaking Change: Multiple graphs used to imply the use of local styles. By default global styles will be used unless you enable the setting `Use local style` on the `Graphs` page.
Fixed: Peak mode configuration was disabled for the Peak / RMS meter.
Fixed: Minor regressions caused by the introduction of local styles.
Fixed: Triangular Filter Bank (TFB) coefficient mapping. This mapping will always use frequencies generated using the Mel scale.

Supported systems: Windows 32-bit, Windows 64-bit.

Links

View version history
Home page
Documentation
Discussion
Source code

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Tags: Columns UI panel, Default UI element, Peak Meter, visualization

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