Sound Intensity Based on Distance from Source
D=10*LOG((P/4pR2)/10-12)
This equation takes the
power
of a sound and and gives you the decibel rating. D is the
decibal rating of a sound. P is the power of the source
in
watts. R is the radius in meters.
Perceived Frequency of Sound
When
You Move
Toward or Away from a Sound Source
FHeard=FActual*(1+(VYou/VSound))
Here is a neat equation for
getting the percieved frequency of a sound source that you
are
approaching or leaving. FHeard is the
frequency
that you hear. FActual is the actual frequency of
the
source. VYou is the your velocity in M/s. VSound
is the sound's velocity in M/s (usually around 344 M/s). If you
are
leaving the sound source, then VYou would have a negative
value.
Perceived Frequency of Sound
When
a Sound
Source Moves Toward or Away from
You
FHeard=FActual*(1/(1-(VSource/VSound)))
Here is a neat equation
forgetting
the percieved frequency of a sound source that approaches
or
leaves you. FHeard is the frequency that you
hear.
FActual is the actual frequency of the source. VSource
is the source's velocity in M/s. VSound is the
sound's velocity in M/s (usually around 344 M/s). If you are
moving
toward the sound source, then VSource would have a negative
value.
Perceived Frequency of Sound
When
a Sound
Source and You Are Both Moving
FHeard=FActual*((VSound+VYou)/(VSound-VSource))
Here is a neat equation
forgetting
the percieved frequency of a sound source that approaches
or
leaves you or you approaching or leaving it. FHeard
is the frequency that you hear. FActual is the
actual frequency of the source. VSource is the
source's velocity in M/s. VSound is the
sound's
velocity in M/s (usually around 344 M/s). VYou
is your velocity in M/s. If you and the sound source are leaving
each other, then
VYou and VSource would
have negative values.
Get Frequency of N 1/2 Steps Above Given Frequency
Fnew = Fold * 1.059463095 N
Plug the frequency in which you want a
highstep
higher than into Fold and the number of halfsteps
that
you want to go up into N. Please note that it is fine to
use
sample rates in place of actual frequencies.
Get Frequency of N 1/2 Steps Above Given Frequency
Fnew = Fold / 1.059463095 N
Plug the frequency in which you want a
highstep
higher than into Fold and the number of halfsteps
that
you want to go up into N. Please note that it is fine to
use
sample rates in place of actual frequencies.
Get Frequency of N Octaves Away From a Given Frequency
Fnew = Fold * 2N
Plug the frequency in which you want N
octaves higher or lower than into Fold and the
number
of halfsteps that you want to go up or down into N.
To go down, use a negative value for N. Please note that
it
is fine to use sample rates in place of actual frequencies.