Measures of Time

By admin |

UPDATE: here’s the online tool to calculate loop length
i made an audio sample composed of several chords using the android app chordbot lite. i recorded the sample from my phone onto my laptop using audacity. i wanted to know exactly where to trim the sample so i could make a loop out of it.

info about the sample:
* the time signature is 4/4 (common time)
* the beats per minute (bpm) is 95
* there are measures

95 beats / 60 seconds = 1.58333333 bps (beats per second)

the top number of the time signature, 4, tells us how many beats per measure there are. so the total number of beats are:
4 beats * 5 measures = 20 beats

to find the number of seconds for the entire sample:
20 / 1.58333333 = 12.631579 seconds

so now i can export the track from audacity with a little bit of extra silence on the end and fine tune the trim to get it exactly perfect using sox:
sox input.flac output.flac trim 0 12.631579

output.flac will now loop perfectly.

common calculations:
120 bpm, 4/4 time, 1 measure = 2 seconds loop

Specials

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