i was listening to this "Radio Lab", Time:
<http://feeds.wnyc.org/~r/radiolab/~3/111663352/24>
in it they talk about a 24 hour long Beethoven 9th (from ~70 minutes), 21x increase.
it sounds like sometime fun? dumb? to try on a cold winter day.
can anyone offer a method?
Full Version: extend (slow down, lengthen) playing time.
NOTE - I didn't listen to that program, 'cause I'm at work.
There are a few ways to do it.
The simplest technique is to change the playback sample rate. If you play a 48kHz file at 4.8kHz, you will slow it down by a factor of 10, and you decrease the pitch by a factor of 10. You would do that by changing the header in the audio file so that the playback software thinks it's playing a 4.8kHz file.
Or, you can increase the number of samples by interpolating between samples. This is how most audio editing programs would handle a speed change.
And, most audio editing programs have an FFT (Fast Fourier Transform) option that allows you to change speed without altering the pitch, or to alter pitch without changing speed.
QUOTE
Replying to extend (slow down, lengthen) playing time... can anyone offer a method?
Most audio editing programs have a way to change the speed. I use GoldWave, and it can do speed and/or pitch changes. (I have no idea if it can make such extreme changes.)There are a few ways to do it.
The simplest technique is to change the playback sample rate. If you play a 48kHz file at 4.8kHz, you will slow it down by a factor of 10, and you decrease the pitch by a factor of 10. You would do that by changing the header in the audio file so that the playback software thinks it's playing a 4.8kHz file.
Or, you can increase the number of samples by interpolating between samples. This is how most audio editing programs would handle a speed change.
And, most audio editing programs have an FFT (Fast Fourier Transform) option that allows you to change speed without altering the pitch, or to alter pitch without changing speed.
QUOTE
it sounds like sometime fun? dumb? to try on a cold winter day.
No comment.
There are probably lots of programs that can do this, but the only one I have used is audacity.
Import in your audio, highlight it and then select effect -> change tempo. If you set the old tempo as (for example) 2 bpm and the new tempo as 1 bmp it will slow it down/ lengthen it to twice as long.
Because of the way that Audacity stores audio data on the hard drive, this method might not be ideal if you want to lengthen a cd by 21 times, because it will have to temporarily store approximately 24 hours of uncompressed pcm data on the computer. If hard drive space is an issue, you'll have to try something else.
Alternately you could try it with just a sample of the music and see how that sounds. Might sound a touch demonic if you try a sample along the same lines as the one I did.
Other programs might have better or worse quality for doing this... I don't really have any experience with any others, though.
Import in your audio, highlight it and then select effect -> change tempo. If you set the old tempo as (for example) 2 bpm and the new tempo as 1 bmp it will slow it down/ lengthen it to twice as long.
Because of the way that Audacity stores audio data on the hard drive, this method might not be ideal if you want to lengthen a cd by 21 times, because it will have to temporarily store approximately 24 hours of uncompressed pcm data on the computer. If hard drive space is an issue, you'll have to try something else.
Alternately you could try it with just a sample of the music and see how that sounds. Might sound a touch demonic if you try a sample along the same lines as the one I did.
Other programs might have better or worse quality for doing this... I don't really have any experience with any others, though.
There are various ways you can achieve this, but 21x expansion would sound incredibly nasty.
None of my TCE plug-ins allow for that much expansion, so Doug's method of modifying the header is probably best.
None of my TCE plug-ins allow for that much expansion, so Doug's method of modifying the header is probably best.
This is a "lo-fi" version of our main content. To view the full version with more information, formatting and images, please click here.