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A 440 Hz tone driven past full scale and hard-clipped so its peaks are flat-topped — an intentionally clipped signal for testing clip and true-peak detection, distortion metering, and de-clipping tools.
Real DTS Coherent Acoustics audio payload encoded from the same deterministic 0.7-second mono reference tone for legacy import coverage. Stable P8 artifact p8-convert-legacy-dts.
Real Yamaha SMAF audio payload encoded from the same deterministic 0.7-second mono reference tone for legacy import coverage. Stable P8 artifact p8-convert-legacy-mmf.
Two seconds of true digital silence (all-zero samples) — a fixture for testing silence detection, auto-trim thresholds, and noise-floor handling.
A DTMF (touch-tone) dialing sequence dialing a reserved 555-01xx number — each digit is the standard dual-tone pair. A fixture for testing DTMF decoders, Goertzel detectors, and tone analysis.
Synthetic DTMF tone sequence for digits “*9#”. Pair with the transcript JSON.
Synthetic DTMF tone sequence for digits “042”. Pair with the transcript JSON.
Synthetic DTMF tone sequence for digits “1234”. Pair with the transcript JSON.
Synthetic DTMF tone sequence for digits “13579”. Pair with the transcript JSON.
Synthetic DTMF tone sequence for digits “567890”. Pair with the transcript JSON.
Ground-truth digit transcript for the DTMF sequence *9#.
Ground-truth digit transcript for the DTMF sequence 042.
Ground-truth digit transcript for the DTMF sequence 1234.
Ground-truth digit transcript for the DTMF sequence 13579.
Ground-truth digit transcript for the DTMF sequence 567890.
The clip as FLAC — free lossless audio compression. Byte-for-byte recoverable to the source PCM; for testing lossless decoders and conversion.
The matching FLAC reduced to STREAMINFO and the exact same audio frames, so metadata-removal tests can compare compressed essence byte for byte.
A FLAC whose STREAMINFO and audio frames are accompanied by known Vorbis comments and a 32-pixel PNG front cover.
A 5-second linear sweep from 20 Hz to 20 kHz across the full audible range — for testing frequency response, spectrograms, and playback fidelity.
An MP3 with a full set of ID3v2.3 tags (title, artist, album, date, genre, comment) over a synthetic C-major melody. A fixture for testing tag readers, metadata editors, and music-library importers.
A 440 Hz tone preceded by exactly 1 second of digital silence. A direct fixture for auto-trim tools — the tone should start at 1.000s.
A 440 Hz tone preceded by exactly 3 seconds of digital silence. A direct fixture for auto-trim tools — the tone should start at 3.000s.
A 440 Hz tone preceded by exactly 5 seconds of digital silence. A direct fixture for auto-trim tools — the tone should start at 5.000s.
1 s 440 Hz tone at linear amplitude 0.55 (~-5.2 dBFS peak) — rung on the Wave E loudness ladder.
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