Simple Audio Sweeper

A handy tool for DIY audio projects

Features

• Automatic and manual sweeping of the audio frequency spectrum to determine the system's frequency response
• Easy generation of any specific sound frequency to test audio equipment or identify unwanted resonances
• Live FFT graph with selectable FFT size, window functions, and post-processing stages
• Input and output device selection
• 8 separate spectrum buffers for result comparison
• Export of results to PNG or CSV files
• Portable
• Dark and light themes
• Automatic frequency peak detection

Simple Audio Sweeper uses the following libraries:

• SoundDevice — interaction with system audio hardware
• NumPy — audio processing and FFT analysis
• DearPyGui — GUI framework
• PyInstaller — building the portable executable

Usage

The microphone and speakers must be connected and configured. Audio from the speakers must be captured by the microphone.

With the mouse cursor on the frequency graph:

• Hold down the left mouse button to generate a specific frequency
• Right-click to lock the frequency
• Use the scroll wheel or arrow keys to adjust the locked frequency
• Start a frequency sweep using the action icon at the bottom

With keyboard:

Key	Action
1–8	Toggle the visibility of the corresponding spectrum buffer (track)
Ctrl	Enable recording into the selected buffer (track)
H	Show help
F12	Toggle settings
F11	Toggle debug info
F	Toggle FFT
F1 / F2	About / License
L / D	Light / Dark theme
V	Toggle VSync
P	Toggle peak detection
S / C	Save screenshot / CSV
Arrow keys	Adjust the locked frequency
F3 / Shift+F3	Cycle FFT size
F4 / Shift+F4	Cycle FFT window function
F5 / Shift+F5 / Ctrl+F5	Cycle values / Toggle FFT Frequency Band Averaging (FBA)
F6 / Shift+F6 / Ctrl+F6	Cycle values / Toggle FFT Smoothing
F7 / Shift+F7 / Ctrl+F7	Cycle values / Toggle FFT Time Domain Averaging (TDA)
space	pause

⚠️ Due to latency in the sound generation, propagation, capture, and analysis chain, manually recording the spectrum with rapid mouse movements can produce inaccurate, "lagged" results depending on the direction of movement. Accurate measurements require slow, manual frequency adjustments or the use of the automatic sweep, which is designed to operate at a controlled, steady pace.

Troubleshooting

FFT chart is enabled but flat

• Check if a microphone or other input source is connected and selected. The Input icon should turn green when active.

The sound is choppy and distorted

• Enable debug information and verify that the OUT and IN sample rates match the selected devices' output and input sample rates. If they do not match, try:
  • Disabling VSync
  • Increasing the latency and block size of the devices
  • Reducing the number of active FFT processing stages or disabling it entirely

Ensure silence during analysis — only the sound emitted by the speakers should be recorded. The resulting characteristics will reflect the combined response of the microphone, speakers, and all other components in the audio path. For example, when analyzing an amplifier with speakers, the microphone's frequency response should be more accurate than that of the speakers being measured.

Download

Portable executable packages for Linux and Windows can be downloaded from the Releases.

Review on MAJORGEEKS

Review on SOFTPEDIA

Supported platforms:

• Linux
• Windows (10,11)

Licensing

• Simple Audio Sweeper is licensed under MIT License

False positives issue

Reference to potential problems with Windows Defender and other antivirus programs.

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