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74thstreet
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7th November 2005
Old 7th November 2005
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Converting BPM to Millisecond

I am trying to set a delay for an H3000 that’s in ms to BPM's. I need help to figure the math. I realize the 60 BPM's is equivalent to 60 seconds or 1 second per BPM; also, that a millisecond is 1/1000 of a second.

I need your help to solve this problem.

Thanks
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7th November 2005
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60000/BPM (you could half or double the result) or 45000/BPM, they'll all be in time .
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Get a stopwatch, start on beat 1, end on beat 11, there's your millis.
Then pass the watch around and play "stopwatch derby", see who can start and stop the timer fastest. fun for minutes! My best is .06.

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8th November 2005
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use a mac

there is a really great widget for the dashboard in OSX Tiger called
audio calculator. Just punch the numbers in and you got it.
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Lets see:

If we take the beats per minute and invert it we get minutes per beat. Then there are 60,000 miliseconds in a minute. So...

85 BPM is (1/85) minutes/ beat = 0.01176

Then multiply by 60,000 for mS/ Beat = 705.8

If you want a half beat it's half or a beat-and- a-half is 1.5 times and so on.





-tINY

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There is also a simple program called EssigKaraoke! that does this. Type in the BPM and it gives you your delay times.
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ah, ye geeks with yer software. The stopwatch us much more fun, it's analog so you know it sounds better and needs no upgrade!
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divide 60 by your BPM (equals your quarter note value in ms)> multiply or divide the product by the musical division you want to use for your delay (2x for a half note, /2 for an eighth note etc...). keep your ears open because perfectly timed delays are often boring and can easily produce feedback, arsen etc...
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Quote:
Originally Posted by 7rojo7
divide 60 by your BPM (equals your quarter note value in ms)
Just to clear up a potential source of minor confusion: dividing 60 by BPM equals the quarter note value in seconds, not milliseconds. (at 120 BPM you get .5 = .5 sec = 500 msec)
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12th November 2005
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Quote:
Originally Posted by audioalchemy
there is a really great widget for the dashboard in OSX Tiger called
audio calculator. Just punch the numbers in and you got it.
where can you find this?
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Quote:
Originally Posted by Brian Middleton
Just to clear up a potential source of minor confusion: dividing 60 by BPM equals the quarter note value in seconds, not milliseconds. (at 120 BPM you get .5 = .5 sec = 500 msec)


but, what if it's in cut time or 6/8? (Or 3/2?)



-tINY

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ok lets say the tempo is 100.

60000/100= 600(ms) quarter note

600/2 = 300 - 1/8 note

600/4 (or 300/2)=150 or 1/16.

Its easy to calculate from there any kind of delay.
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But, if tthe song is in 6/8, a quarter note would be 1200mS at 100 BPM....



-tINY

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Quote:
Originally Posted by tINY


but, what if it's in cut time or 6/8? (Or 3/2?)



-tINY

Sorry, you're right, it would be better to say "beat value" rather than quarter note value. So in 6/8, where the tempo is usually expressed in dotted quarters, then 60/BPM = seconds per dotted quarter....divide that by 3 to get seconds per eighth note.
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Quote:
Originally Posted by tINY


But, if tthe song is in 6/8, a quarter note would be 1200mS at 100 BPM....



-tINY

6/8 is usually counted in two rather than 6, so at 100 BPM a dotted quarter would be 600 msec and a quarter would be 400.
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I'm not a Math person and I use this free software : BPM Calc
There is a mac osx and a win version and I use it everyday!
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Good old math way, for 4/4.

Determine beats per mnute, I ususally count how many beats per 15 sec and x 4, if it's not known.

/ 60 = beats per second

1000 / bps = milliseconds per beat.

mpb / 2 = 1/8 note delay

mpb / 3 = 1/8 triplet

/ 4 = 1/16 delay

/ 6 = 1/16 trip


mps x 4 = 1 measure of delay

Example 120bpm

/ 60 = 2 bps

1000 / 2 = 500 ms per quater note

500 /3 = 166ms (1/8 trip)

500 x 4 = 2000ms ( 1 measure of delay)
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This is pretty basic math. Unless you dropped out of school before the fourth grade I really don't see how anybody could have a problem with this.
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240 / BPM = duration of 1 measure (1 bar or 1 loop) in seconds, regardless of meter. If it seems too fast or too slow, double or half it.

Multiply times 1000 for milliseconds since 1 second = 1000 milliseconds. The result is the duration of 1 measure in milliseconds. Divide that by 8 to get the duration in milliseconds of 8ths of a measure if there are 8 beats per measure.

Similarly, 240 / duration of 1 measure (in seconds) = BPM regardless of meter.

Beware of tools and formulas that assume the meter is 4/4. If the meter is 7/4 or 6/4 or 12/8 or whatnot you are screwed with those. With the 240 divided by scheme, it works no matter what because it's not tied to quarters of measures nor quarter notes (which aren't always quarters of measures!!!!!) but to the actual value of a measure which is always 1.
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I use
60000/BPM
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