What sort of formula might I apply to a set of score
events so that the otherwise evenly spaced notes will
be heard as moving smoothly from tempo A to tempo B?

Is there a way to calculate what the actual duration
of the playback will be?

Thanks!

Tobiah


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Istvan Varga a while back helped me out with this on this list.  I
can't find the email, but it was from April 13, 2006, according to the
comments I have in my code that references his post. The code I have
is used in blue for tempo changes at the global level as well as the
per-soundObject level, and can be found here:

http://bluemusic.hg.sourceforge.net/hgweb/bluemusic/blue/file/f769a822a55e/blue-core/src/blue/noteProcessor/TempoMapper.java

Hope that helps!
steven

On Thu, Jan 20, 2011 at 8:40 PM, Toby  wrote:
> What sort of formula might I apply to a set of score
> events so that the otherwise evenly spaced notes will
> be heard as moving smoothly from tempo A to tempo B?
>
> Is there a way to calculate what the actual duration
> of the playback will be?
>
> Thanks!
>
> Tobiah
>
>
> Send bugs reports to the Sourceforge bug tracker
>           https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
> csound"
>
>


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The "t" statement allows for smooth change in tempo, with no need to do the math yourself. The math for the duration is simple: for a linear change from tempo a to tempo b (which is what the t statement does iirc), the total duration is the time taken if the tempo was a, + the time taken if the tempo was b, divided by 2. Of course if you have multiple accellerandos / decellerandos, each will need to be calculated seperately (or just use a t statement and there is no need to calculate any of it by hand and just see how long the whole thing ends up being).

----- Original message -----
> Istvan Varga a while back helped me out with this on this list.  I
> can't find the email, but it was from April 13, 2006, according to the
> comments I have in my code that references his post. The code I have
> is used in blue for tempo changes at the global level as well as the
> per-soundObject level, and can be found here:
>
> http://bluemusic.hg.sourceforge.net/hgweb/bluemusic/blue/file/f769a822a55e/blue-core/src/blue/noteProcessor/TempoMapper.java
>
> Hope that helps!
> steven
>
> On Thu, Jan 20, 2011 at 8:40 PM, Toby <toby@tobiah.org> wrote:
> > What sort of formula might I apply to a set of score
> > events so that the otherwise evenly spaced notes will
> > be heard as moving smoothly from tempo A to tempo B?
> >
> > Is there a way to calculate what the actual duration
> > of the playback will be?
> >
> > Thanks!
> >
> > Tobiah
> >
> >
> > Send bugs reports to the Sourceforge bug tracker
> >           https://sourceforge.net/tracker/?group_id=81968&atid=564599
> > Discussions of bugs and features can be posted here
> > To unsubscribe, send email sympa@lists.bath.ac.uk with body
> > "unsubscribe csound"
> >
> >
>
>
> Send bugs reports to the Sourceforge bug tracker
>                        https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
> csound"
>

I think this isn't quite correct, as it accumulates over time and thus
an integral calculation.  I found the original thread:

http://csound.1045644.n5.nabble.com/Calculating-Seconds-to-Beats-in-TimeWarp-td1098542.html

Istvan's post explains it well I think, and his example python scripts
look like their in Nabble's archives.


On Fri, Jan 21, 2011 at 6:23 AM, Justin Smith  wrote:
> The "t" statement allows for smooth change in tempo, with no need to do the
> math yourself. The math for the duration is simple: for a linear change from
> tempo a to tempo b (which is what the t statement does iirc), the total
> duration is the time taken if the tempo was a, + the time taken if the tempo
> was b, divided by 2. Of course if you have multiple accellerandos /
> decellerandos, each will need to be calculated seperately (or just use a t
> statement and there is no need to calculate any of it by hand and just see
> how long the whole thing ends up being).
>
> ----- Original message -----
>> Istvan Varga a while back helped me out with this on this list.  I
>> can't find the email, but it was from April 13, 2006, according to the
>> comments I have in my code that references his post. The code I have
>> is used in blue for tempo changes at the global level as well as the
>> per-soundObject level, and can be found here:
>>
>>
>> http://bluemusic.hg.sourceforge.net/hgweb/bluemusic/blue/file/f769a822a55e/blue-core/src/blue/noteProcessor/TempoMapper.java
>>
>> Hope that helps!
>> steven
>>
>> On Thu, Jan 20, 2011 at 8:40 PM, Toby  wrote:
>> > What sort of formula might I apply to a set of score
>> > events so that the otherwise evenly spaced notes will
>> > be heard as moving smoothly from tempo A to tempo B?
>> >
>> > Is there a way to calculate what the actual duration
>> > of the playback will be?
>> >
>> > Thanks!
>> >
>> > Tobiah
>> >
>> >
>> > Send bugs reports to the Sourceforge bug tracker
>> >           https://sourceforge.net/tracker/?group_id=81968&atid=564599
>> > Discussions of bugs and features can be posted here
>> > To unsubscribe, send email sympa@lists.bath.ac.uk with body
>> > "unsubscribe csound"
>> >
>> >
>>
>>
>> Send bugs reports to the Sourceforge bug tracker
>>
>> https://sourceforge.net/tracker/?group_id=81968&atid=564599
>> Discussions of bugs and features can be posted here
>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
>> csound"
>>
>
>


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