{"version":1,"page":"https://fix.fm/samples","source":"https://archive.org/details/ssc107_2308_librivox","settings":"One repair at 100% amount. No other repair in the chain.","measurementNote":"Measurements are from decoded PCM before playback level matching and MP3 encoding. Null is explained by measurement.empty: no tones detected or a reading that could not be established, not zero.","playbackNote":"MP3, 192 kbps. All comparisons except quiet audio are matched to -23 LUFS before encoding. Quiet comparisons deliberately preserve the volume change.","samples":[{"id":"noise-fan","fx":"02","title":"A fan","recipe":"Pink noise 10 dB under the voice","outcome":"The steady background falls. Compare the consonants as well as the pauses.","before":"/samples/noise-fan.mp3","after":"/samples/noise-fan-fixed.mp3","seconds":10,"playbackLufs":-23,"voices":["voice-a"],"measurement":{"label":"Speech above the stillest background","before":17,"after":65,"unit":"dB"},"tool":"/remove-background-noise","evidence":"/remove-background-noise#evidence-title"},{"id":"noise-talker","fx":"02","title":"Someone else talking","recipe":"A second reader 12 dB under the voice","outcome":"The second speaker remains audible. Noise reduction is designed to preserve speech, including the voice you wanted to remove.","before":"/samples/noise-talker.mp3","after":"/samples/noise-talker-fixed.mp3","seconds":10,"playbackLufs":-23,"voices":["voice-a","voice-b"],"measurement":{"label":"Speech above the stillest background","before":53,"after":62,"unit":"dB"},"tool":"/remove-background-noise","evidence":"/remove-background-noise#evidence-title"},{"id":"echo-small","fx":"01","title":"Small room","recipe":"A software room that rings for 0.55 s","outcome":"The room tail falls. Echo repair is beta; it cannot recreate a recording made in a dry room.","before":"/samples/echo-small.mp3","after":"/samples/echo-small-fixed.mp3","seconds":12,"playbackLufs":-23,"voices":["voice-b"],"measurement":{"label":"Measured room decay","empty":"not measured","before":0.52,"after":0.28,"unit":"s"},"tool":"/remove-echo","evidence":"/remove-echo#evidence-title"},{"id":"echo-noisy","fx":"01","title":"Big room, noisy","recipe":"The same 1.4 s room with hiss 12 dB under the voice","outcome":"The noise masks the room, so the echo check is unsure and this repair leaves the file alone. The full evidence page also tries noise removal first.","before":"/samples/echo-noisy.mp3","after":"/samples/echo-noisy-fixed.mp3","seconds":12,"playbackLufs":-23,"voices":["voice-b"],"measurement":{"label":"Measured room decay","empty":"not measured","before":null,"after":null,"unit":"s"},"tool":"/remove-echo","evidence":"/remove-echo#evidence-title"},{"id":"muffled-moderate","fx":"03","title":"Dull, 3 kHz","recipe":"Low-passed at 3 kHz","outcome":"More of the voice's top end comes through. Listen for clarity rather than a volume increase.","before":"/samples/muffled-moderate.mp3","after":"/samples/muffled-moderate-fixed.mp3","seconds":10,"playbackLufs":-23,"voices":["voice-a"],"measurement":{"label":"High-frequency energy relative to the voice body","before":-54.7,"after":-20.9,"unit":"dB"},"tool":"/fix-muffled-audio","evidence":"/fix-muffled-audio#evidence-title"},{"id":"muffled-severe","fx":"03","title":"Dark, 1.5 kHz","recipe":"Low-passed at 1.5 kHz","outcome":"The top end improves but still measures severely muffled. EQ cannot replace detail that the filter removed.","before":"/samples/muffled-severe.mp3","after":"/samples/muffled-severe-fixed.mp3","seconds":10,"playbackLufs":-23,"voices":["voice-a"],"measurement":{"label":"High-frequency energy relative to the voice body","before":-78.7,"after":-62.7,"unit":"dB"},"tool":"/fix-muffled-audio","evidence":"/fix-muffled-audio#evidence-title"},{"id":"distorted-clipped","fx":"04","title":"Clipped in the recorder","recipe":"Pushed 9 dB over full scale and cut off flat","outcome":"Flattened peaks are rebuilt and the waveform gets closer to the original. The damaged take is still an estimate, not the lost original.","before":"/samples/distorted-clipped.mp3","after":"/samples/distorted-clipped-fixed.mp3","seconds":10,"playbackLufs":-23,"voices":["voice-a"],"measurement":{"label":"Samples detected as clipped","before":1.2,"after":0,"unit":"%"},"tool":"/fix-distorted-audio","evidence":"/fix-distorted-audio#evidence-title"},{"id":"distorted-saturated","fx":"04","title":"Overdriven before the recorder","recipe":"Pushed 9 dB into a soft saturator, so the tops are bent round instead of cut off","outcome":"Soft saturation is not flagged as hard clipping. The repair leaves these bent peaks alone.","before":"/samples/distorted-saturated.mp3","after":"/samples/distorted-saturated-fixed.mp3","seconds":10,"playbackLufs":-23,"voices":["voice-a"],"measurement":{"label":"Samples detected as clipped","before":0,"after":0,"unit":"%"},"tool":"/fix-distorted-audio","evidence":"/fix-distorted-audio#evidence-title"},{"id":"quiet-quiet","fx":"05","title":"Quiet take","recipe":"The reading turned down to -36 LUFS","outcome":"The voice gets louder, with peak control. Start at a comfortable listening volume before switching to the result.","before":"/samples/quiet-quiet.mp3","after":"/samples/quiet-quiet-fixed.mp3","seconds":10,"playbackLufs":null,"voices":["voice-a"],"measurement":{"label":"Integrated loudness","before":-36,"after":-16.5,"unit":"LUFS"},"tool":"/fix-quiet-audio","evidence":"/fix-quiet-audio#evidence-title"},{"id":"quiet-hissy","fx":"05","title":"Quiet take with hiss","recipe":"The same take with hiss 30 dB under the voice","outcome":"Turning up the voice turns up the hiss too. Noise removal is a separate step; this comparison uses only the level fix.","before":"/samples/quiet-hissy.mp3","after":"/samples/quiet-hissy-fixed.mp3","seconds":10,"playbackLufs":null,"voices":["voice-a"],"measurement":{"label":"Integrated loudness","before":-36,"after":-16.5,"unit":"LUFS"},"tool":"/fix-quiet-audio","evidence":"/fix-quiet-audio#evidence-title"},{"id":"one-ear-dead","fx":"06","title":"One side dead","recipe":"The voice on the left, nothing at all on the right","outcome":"The live left channel is copied to both ears. Listen in stereo to hear the change.","before":"/samples/one-ear-dead.mp3","after":"/samples/one-ear-dead-fixed.mp3","seconds":10,"playbackLufs":-23,"voices":["voice-a"],"measurement":{"label":"Gap between the two channels during speech","before":96.4,"after":0,"unit":"dB"},"tool":"/fix-audio-one-ear","evidence":"/fix-audio-one-ear#evidence-title"},{"id":"one-ear-two","fx":"06","title":"Two people, one each side","recipe":"One voice on the left, a second voice 10 dB down on the right","outcome":"Both voices are mixed into both ears. Their relative levels stay the same; balancing channels does not make the quiet guest equally loud.","before":"/samples/one-ear-two.mp3","after":"/samples/one-ear-two-fixed.mp3","seconds":10,"playbackLufs":-23,"voices":["voice-a","voice-b"],"measurement":{"label":"Gap between the two channels during speech","before":8.4,"after":0,"unit":"dB"},"tool":"/fix-audio-one-ear","evidence":"/fix-audio-one-ear#evidence-title"},{"id":"hum-hum","fx":"07","title":"Mains hum","recipe":"60 Hz and its first 4 harmonics, 22 dB under the voice","outcome":"The low pitched tones fall. Compare the pauses and the low body of the voice.","before":"/samples/hum-hum.mp3","after":"/samples/hum-hum-fixed.mp3","seconds":10,"playbackLufs":-23,"voices":["voice-a"],"measurement":{"label":"Detected mains tones relative to speech","empty":"none detected","before":-23.2,"after":null,"unit":"dB"},"tool":"/remove-hum","evidence":"/remove-hum#evidence-title"},{"id":"hum-buzz","fx":"07","title":"A buzz","recipe":"60 Hz with 24 harmonics, 22 dB under the voice","outcome":"The first five tones fall but the bright buzz above them remains. A fine hum check does not mean every harmonic is gone.","before":"/samples/hum-buzz.mp3","after":"/samples/hum-buzz-fixed.mp3","seconds":10,"playbackLufs":-23,"voices":["voice-a"],"measurement":{"label":"Detected mains tones relative to speech","empty":"none detected","before":-24,"after":null,"unit":"dB"},"tool":"/remove-hum","evidence":"/remove-hum#evidence-title"},{"id":"wind-gusts","fx":"08","title":"Gusty wind","recipe":"Low rumble that swells and drops, 22 dB under the voice","outcome":"The gusting low rumble falls. Listen for the low body of the voice that the filter should keep.","before":"/samples/wind-gusts.mp3","after":"/samples/wind-gusts-fixed.mp3","seconds":10,"playbackLufs":-23,"voices":["voice-a"],"measurement":{"label":"Time detected as windy","before":19.7,"after":0,"unit":"%"},"tool":"/remove-wind-noise","evidence":"/remove-wind-noise#evidence-title"},{"id":"wind-thumps","fx":"08","title":"Plosives","recipe":"8 low thumps of 80 ms at word starts, as loud as the voice","outcome":"Short plosive thumps are not detected as sustained gusts. This wind repair leaves them alone.","before":"/samples/wind-thumps.mp3","after":"/samples/wind-thumps-fixed.mp3","seconds":10,"playbackLufs":-23,"voices":["voice-a"],"measurement":{"label":"Time detected as windy","before":0,"after":0,"unit":"%"},"tool":"/remove-wind-noise","evidence":"/remove-wind-noise#evidence-title"}]}