KolibriTTS 0.6

KolibriTTS is a compact native text-to-speech reader for KolibriOS, written in 32-bit FASM assembly. It opens plain text files and speaks them using selectable German or English pronunciation.

Features

• Native KolibriOS MENUET01 application
• English user interface
• German and English pronunciation modes
• KolibriOS OpenDialog file selection
• Plain-text input up to 32 KiB
• Rule-based grapheme and digraph processing
• German rules for sch, ch, ei, ie, eu, ä, ö, ü and ß
• English rules for sh, ch, th, ng, oo, ee and qu
• Embedded German and English 8 kHz allophone voice banks
• Distinct vowels, fricatives, plosives and nasal sounds
• Punctuation pauses and sentence phrasing
• Direct 8 kHz, 8-bit mono PCM output through the KolibriOS sound service
• No runtime libraries or external voice files

Build on Windows

1. Download the official Windows release of FASM.
2. Place fasm.exe in tools\fasm.exe, set FASM_HOME, or add FASM to PATH.
3. Run build_windows.bat.
4. Copy build\KOLITTS to a drive accessible from KolibriOS.

The build script also copies the German and English example files into the build directory.

Use

1. Start KOLITTS in KolibriOS.
2. Select Open and choose a .txt file.
3. Select German or English.
4. Select Speak.
5. Select Stop to stop playback. Press Esc to exit.

Short sentences with normal punctuation produce the clearest result. UTF-8 German umlauts and ß are recognized.

Command line

KOLITTS -nogui speak DE "Hallo Welt, ich mag dich."
KOLITTS -nogui speak EN "Hello world, I like you."

The process waits for the generated PCM duration and then exits.

Note

There is also a working Windows 10/11 Version at https://github.com/zeittresor/kolitts/tree/main/tools/WindowsFASM_TTS_Version/build you can use with the GUI or using commandline.

Requirements

• KolibriOS with /sys/lib/proc_lib.obj and OpenDialog
• An active KolibriOS sound driver providing the INFINITY sound service
• FASM for rebuilding the application

Project layout

• src/main.asm — application and speech synthesizer
• build_windows.bat — Windows compiler script
• build/KOLITTS — ready-to-run KolibriOS binary
• examples/ — German and English sample text

License: MIT.