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Audio-DSP-Lab 1.3 — the front panel's spectrum

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@andiepp andiepp released this 25 Oct 08:44
· 21 commits to main since this release
v1.3
61e74d1

Audio-DSP-Lab 1.3 improves the front panel's spectrum. In the THD and Spectrum views of the Analysis page, harmonics now stand out as spikes against a dB grid.

Firmware 1.3, protocol 1, application 1.3, panel firmware 1.3. The board's firmware and the application only change their version number; the changes are in the panel's firmware.

Downloads

File What it is
Audio-DSP-Lab-1.3-windows-x64.zip The Windows application (self-contained), the board's and the panel's firmware with their flash tools, and the documentation as Markdown and PDF
Audio-DSP-Lab-firmware-1.3.zip The firmware for the board and the panel with the flash tools alone

Not the "Source code (zip)": it holds the repository, without AudioDspLab.exe and the firmware images; download Audio-DSP-Lab-1.3-windows-x64.zip above.

Updating from 1.2

  1. Flash the front panel: firmware\Flash-Panel.cmd (the panel's port).
  2. Flash the board: firmware\Flash-Firmware.cmd COM5 (your board's port). Its stored settings stay.
  3. Replace AudioDspLab.exe with the new one.

Without a front panel, nothing changes for you. The update only keeps the versions level.

What's new

  • The whole spectrum on the panel. The THD and Spectrum views now draw all 256 of the board's spectrum points instead of 64. Each point is the strongest FFT bin in its stretch, so every harmonic stands out as a spike of its own.
  • A dB scale on the panel's spectrum. The scale runs from 0 to −120 dBFS (it was −140), with a grid line every 20 dB, labelled −20, −60 and −100.
  • A taller plot while measuring. The values take the tiles' place in a smaller font, so the plot grows into the room they leave.
  • No more gaps in the panel's spectrum. The panel's receive buffer now holds a whole spectrum answer, 16 KB instead of 4 KB. Before, points could get lost while the screen was drawing, and the plot showed a straight line across them. An answer with a line missing now keeps the spectrum already on screen.
  • Grid lines in the panel's plots (equalizer, analysis, synthesizer) are a little brighter.
  • Docs: the panel's screenshots of THD and Spectrum are new, and the manual and the front panel guide describe the new scale.

See CHANGELOG.md for every change.

Licences

Audio-DSP-Lab is MIT-licensed. The board's firmware contains:

  • arduino-audio-tools and libhelix (GPL-3.0);
  • esp-dsp (Apache-2.0).

The panel's firmware contains LVGL (MIT). See THIRD-PARTY-NOTICES.md in the packages.

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