This web tool is capable of transcribing audio recordings of BBC Micro or Acorn Electron software cassettes. Audio is rendered to TIBET, and then optionally to UEF.
It is based on a cut-down, WebAssembly version of the Quadbike program. Richer functionality is available using a full version of Quadbike and its associated tools. See the documentation. The Quadbike documentation also contains some hints on successfully making digital recordings from Acorn audio tapes.
Browser RAM restrictions mean that audio files much longer than 20 minutes or so in duration are likely to fail. You could try downsampling the input file to 22,050 Hz (from 44.1K or 48K) before submitting it. Or, download the full, installable version of Quadbike and use that.
Only frequency sync mode is available in the web version of Quadbike. The memory requirements of the PLL are too onerous.
Load up a WAV, FLAC or AIFF file below containing an audio recording of a BBC Micro or Acorn Electron software cassette. Select the right stereo channel if necessary, then hit the Quadbike! button. After processing, the resulting TIBET textual output may be inspected under the TIBET output heading below, and either copied to the clipboard, or downloaded as a TIBET file.
Once a TIBET has been obtained, it may be converted to a UEF file using the TIBET → UEF option at the bottom.
If you are looking for test audio, candidate WAV and FLAC files are available online from various repositories:
'vanekp', 'Diminished', 'VectorEyes' Beebug set, 'VectorEyes' Set 1, 'atsampson'.