[Neil Rutman]

I accidentily played back a 44.1khz 24 bit file at 48khz which makes it
sound about 1/2 step up and a bit faster. I prefer the sound of it this way
so I will record the individual parts off the board like this and put them
in a new file. Does anyone know a formula or can tell me how to figure out
what the new tempo is? I can approximate with my metronome but I want to be
precise.

Original file:

Key of "B" - BPM 130 at 44.1 khz 24 bit

New File:

Key of "C" - BPM ??? at 48khz 24 bit

Thanks,

Neil R

[Boris Lau]

Neil Rutman schrieb:
Key of "B" - BPM 130 at 44.1 khz 24 bit
New File:
Key of "C" - BPM ??? at 48khz 24 bit

it's 130/44.1*48
too easy a formula? well, multiply it with e^(2*Pi*i)

Best
Boris

--
http://www.borislau.de - computer science, music, photos

[Chris Hornbeck]

On Thu, 6 Nov 2008 15:46:57 -0800, "Neil Rutman"
wrote:

I accidentily played back a 44.1khz 24 bit file at 48khz which makes it
sound about 1/2 step up and a bit faster. I prefer the sound of it this way
so I will record the individual parts off the board like this and put them
in a new file. Does anyone know a formula or can tell me how to figure out
what the new tempo is? I can approximate with my metronome but I want to be
precise.

Original file:

Key of "B" - BPM 130 at 44.1 khz 24 bit

New File:

Key of "C" - BPM ??? at 48khz 24 bit

130 X (48/44.1).

That part's obvious, so your question must go deeper. The key
change isn't exact if you have perfect pitch - is that it?

All good fortune,
Chris Hornbeck

[RD Jones]

On Nov 6, 6:46*pm, "Neil Rutman" wrote:
I accidentily played back a 44.1khz 24 bit file at 48khz which makes it
sound about 1/2 step up and a bit faster. I prefer the sound of it this way
so I will record the individual parts off the board like this and put them
in a new file. Does anyone know a formula or can tell me how to figure out
what the new tempo is? *I can approximate with my metronome but I want to be
precise.

Original file:

Key of "B" - BPM 130 at 44.1 khz 24 bit

New File:

Key of "C" - BPM ??? at 48khz 24 bit

Thanks,

Neil R

None of this works out to be "precise" whole numbers.

The new bpm is about 141.497. 130x(48/44.1)

The twelfth root of 2 = "about" 1.05946.
Which makes your key approximately a quarter-tone below an actual C.
A whole step would have been 2x(12,/2), or approx 1.12245.

Obviously more thought could have gone into establishing these ratios
when digital was in it's infancy, but ... oh well.

rd

[Mark]

Obviously more thought could have gone into establishing these ratios
when digital was in it's infancy, but ... oh well.



see:

http://www.cs.columbia.edu/~hgs/audio/44.1.html

Mark

[jason]

In article ,
says...

it's 130/44.1*48
too easy a formula? well, multiply it with e^(2*Pi*i)

Best
Boris
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