{ "page": "https://diffio.ai/remove-hum-hiss-static/", "samples": [ { "id": "hiss-01", "type": "synthetic", "label": "Sample made by mixing clean speech (LibriTTS, CC BY 4.0) with a real recording of blank cassette tape hiss (\"TAPE HISS Sonab c500 B\" by foad, Freesound, CC0; high-passed at 1.5 kHz to drop the deck's low rumble). Restored with Diffio 4.6 Pro. Both clips are loudness-matched for playback.", "claimableImpairments": [ "hiss" ], "verification": "clef-omni and signal checks", "durationSeconds": 21.53, "files": { "original": "hiss-01-original.mp3", "pro": "hiss-01-pro.mp3" }, "sources": [ { "role": "clean speech", "title": "LibriTTS test-clean speaker 237, utterances 237_126133_000033_000000 to 237_126133_000033_000001", "author": "LibriTTS (Zen et al., 2019), from a public-domain LibriVox reading", "url": "https://www.openslr.org/60/", "license": "CC BY 4.0", "license_url": "https://creativecommons.org/licenses/by/4.0/" }, { "role": "impairment recording", "title": "TAPE HISS Sonab c500 B", "author": "foad", "url": "https://freesound.org/people/foad/sounds/443339/", "license": "CC0 1.0", "license_url": "https://creativecommons.org/publicdomain/zero/1.0/" } ], "mixing": { "id": "hiss-01", "page": "hum-hiss-static", "impairment": "tape hiss", "speech": "libritts_237_126133_000033", "noise_gain_eq": [ [ "hp", 1500, 2 ] ], "lead_s": 2.5, "seed": 15, "steps": [ { "add_noise": [ { "freesound_id": "443339", "snr_db": 8.0, "gain": 1.104, "looped": false, "offset_s": 39.018, "noise_eq": [ [ "hp", 1500, 2 ] ] } ] }, { "final_peak_normalise_dbfs": -1.0 } ], "sample_rate": 48000, "tail_silence_s": 0.8, "duration_s": 21.5 }, "diffio": { "model": "diffio-4.6-pro", "generationId": "48c36e66-a9bc-4dad-aa1c-224900ed3eda", "requested_at_utc": "2026-11-03T17:37:12Z" }, "loudnessMatching": { "standard": "ITU-R BS.1770-4 integrated loudness (pyloudnorm)", "target_lufs": -22.5, "before_lufs_raw": -21.68, "after_lufs_raw": -22.57, "before_gain_db": -0.82, "after_gain_db": 0.07, "note": "one static gain per file; no EQ, limiting, trimming or noise processing" } }, { "id": "crackle-01", "type": "synthetic", "label": "Sample made by mixing clean speech (LibriTTS, CC BY 4.0) with a real recording of the crackle of a blank 1940s 78 rpm record groove (\"78 surface noise.wav\" by nervousneal, Freesound, CC0). Restored with Diffio 4.6 Pro. Both clips are loudness-matched for playback.", "claimableImpairments": [ "crackle/static" ], "verification": "clef-omni and signal checks", "durationSeconds": 20.06, "files": { "original": "crackle-01-original.mp3", "pro": "crackle-01-pro.mp3" }, "sources": [ { "role": "clean speech", "title": "LibriTTS test-clean speaker 260, utterances 260_123288_000038_000000 to 260_123288_000038_000001", "author": "LibriTTS (Zen et al., 2019), from a public-domain LibriVox reading", "url": "https://www.openslr.org/60/", "license": "CC BY 4.0", "license_url": "https://creativecommons.org/licenses/by/4.0/" }, { "role": "impairment recording", "title": "78 surface noise.wav", "author": "nervousneal", "url": "https://freesound.org/people/nervousneal/sounds/341761/", "license": "CC0 1.0", "license_url": "https://creativecommons.org/publicdomain/zero/1.0/" } ], "mixing": { "id": "crackle-01", "page": "hum-hiss-static", "impairment": "record crackle / surface noise", "speech": "libritts_260_123288_000038", "seed": 16, "steps": [ { "add_noise": [ { "freesound_id": "341761", "snr_db": 6.0, "gain": 5.05139, "looped": false, "offset_s": 88.234 } ] }, { "final_peak_normalise_dbfs": -1.0 } ], "sample_rate": 48000, "lead_s": 0.6, "tail_silence_s": 0.8, "duration_s": 20.03 }, "diffio": { "model": "diffio-4.6-pro", "generationId": "6fb58379-7b0f-4258-9250-3181f0c1d5ea", "requested_at_utc": "2026-11-03T17:37:12Z" }, "loudnessMatching": { "standard": "ITU-R BS.1770-4 integrated loudness (pyloudnorm)", "target_lufs": -27.0, "before_lufs_raw": -26.83, "after_lufs_raw": -18.93, "before_gain_db": -0.17, "after_gain_db": -8.07, "note": "one static gain per file; no EQ, limiting, trimming or noise processing" } }, { "id": "hum-60hz-01", "type": "synthetic", "label": "Sample made by mixing clean speech (LibriTTS, CC BY 4.0) with a real recording of 60 Hz ground-loop hum from a vintage boom box (\"Analog Ground Loop Hum Noise\" by grantorino551, Freesound, CC0). Restored with Diffio 4.6 Pro. Both clips are loudness-matched for playback.", "claimableImpairments": [], "verification": "signal check only (50/60 Hz peak prominence); clef-omni cannot detect hum under speech", "durationSeconds": 22.01, "files": { "original": "hum-60hz-01-original.mp3", "pro": "hum-60hz-01-pro.mp3" }, "sources": [ { "role": "clean speech", "title": "LibriTTS test-clean speaker 1320, utterances 1320_122612_000039_000003 to 1320_122612_000039_000004", "author": "LibriTTS (Zen et al., 2019), from a public-domain LibriVox reading", "url": "https://www.openslr.org/60/", "license": "CC BY 4.0", "license_url": "https://creativecommons.org/licenses/by/4.0/" }, { "role": "impairment recording", "title": "Analog Ground Loop Hum Noise", "author": "grantorino551", "url": "https://freesound.org/people/grantorino551/sounds/845049/", "license": "CC0 1.0", "license_url": "https://creativecommons.org/publicdomain/zero/1.0/" } ], "mixing": { "id": "hum-60hz-01", "page": "hum-hiss-static", "impairment": "mains hum (60 Hz)", "speech": "libritts_1320_122612_000039", "lead_s": 2.5, "seed": 13, "steps": [ { "add_noise": [ { "freesound_id": "845049", "snr_db": 4.0, "gain": 0.27259, "looped": true, "loop_crossfade_s": 0.5, "source_len_s": 7.19 } ] }, { "final_peak_normalise_dbfs": -1.0 } ], "sample_rate": 48000, "tail_silence_s": 0.8, "duration_s": 21.96 }, "diffio": { "model": "diffio-4.6-pro", "generationId": "7c547825-2141-4fd2-8f3d-4496892cdc7b", "requested_at_utc": "2026-11-03T17:37:35Z" }, "loudnessMatching": { "standard": "ITU-R BS.1770-4 integrated loudness (pyloudnorm)", "target_lufs": -21.5, "before_lufs_raw": -21.28, "after_lufs_raw": -20.01, "before_gain_db": -0.22, "after_gain_db": -1.49, "note": "one static gain per file; no EQ, limiting, trimming or noise processing" } } ] }