Spec 168: each table below names a WAV instead of an image. GramFrame decodes
the recording, analyses it in the browser and shows the spectrogram as a waterfall: press ▶ and
the newest sound enters at the top while the picture slides down, in step with the audio.
Pause to use the annotation tools; they scroll with the gram when you resume. On a focused
player Space plays/pauses, J/L seek ±5 s,
Home restarts, M mutes. Recordings are from the Work With Sounds
project via Wikimedia Commons, CC BY 4.0.
Hot-bulb diesel engine (1932)
window-seconds
10
freq-end
2000
Icebreaker engine room
window-seconds
10
fft-size
2048
freq-end
1500
Air compressor
window-seconds
8
freq-end
4000
Francis water turbine
window-seconds
10
freq-end
1000
Test steps:
Press ▶ on a player — the gram fills from the top and scrolls down while the audio plays
Pause, switch to Harmonics and drag on a tonal; press ▶ again — the set rides the gram
Seek back before the set with the slider — it disappears; seek past it — it returns
Change the rate to 2× — the frequency readouts are unchanged