time

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time

Permanent link to this post Posted by ceci3 » Mon Jan 15, 2018 2:13 pm

Hi, I would like to start an imported sound at a certain time for example 0.118 seconds by hand. How is it done?
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Re: time

Permanent link to this post Posted by Trebor » Mon Jan 15, 2018 6:32 pm

Can use the up ↑ and down ↓ keys to dial-in start at 0.118 ...

start at 118 milliseconds.gif
start at 118 milliseconds.gif (121 KiB) Viewed 526 times

or key-in "1","1","8".
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Re: time

Permanent link to this post Posted by ceci3 » Tue Jan 16, 2018 12:26 pm

Thanks but if i want to start the track at the 0.000219 second?
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Re: time

Permanent link to this post Posted by steve » Tue Jan 16, 2018 2:46 pm

ceci3 wrote:0.000219 second?

Is that a typing error?
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Re: time

Permanent link to this post Posted by ceci3 » Tue Jan 16, 2018 5:26 pm

I want to start two sounds imported one at 0 sec and the other 0.000219 seconds later but
I can not start the second at 0.000219 accurate

fullwindow001.png
fullwindow001.png (62.89 KiB) Viewed 515 times
Last edited by steve on Tue Jan 16, 2018 6:41 pm, edited 1 time in total.
Reason: Put image inline to preserve board layout
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Re: time

Permanent link to this post Posted by Trebor » Tue Jan 16, 2018 7:01 pm

ceci3 wrote:I want to start two sounds imported one at 0 sec and the other 0.000219 seconds later

generate silence at the start of one of the tracks, that will delay it.
"0.000219" seconds at a sample-rate of 44100Hz is ~9 samples ...

generate silence  9 samples duration.gif
generate silence 9 samples duration.gif (63.16 KiB) Viewed 511 times
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Re: time

Permanent link to this post Posted by steve » Tue Jan 16, 2018 7:04 pm

Digital audio has discrete time divisions. At a sample rate of 44100 Hz, theses time divisions are 1/44100 th second = 0.000022676 s.
0.000219 seconds = 0.000219 x 44100 sample periods = 10 sample periods (or 9, depending on how you round). Note that this must be an integer value because PCM digital audio has discrete time divisions.

To set the start position as close as possible to 0.000219 seconds, set the time units to samples, and select 10 samples.

Note that Audacity is a little peculiar in that it will allow you to paste to a time position that is not an exact number of samples. This is related to Audacity's ability to support multiple sample rates in the same project. However, that does not alter the physical facts of PCM digital audio, and sample values will always be calculated at discrete sample positions.
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Re: time

Permanent link to this post Posted by ceci3 » Wed Jan 17, 2018 11:15 am

Thanks!!!!! :D :D :D :D :D
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Re: time

Permanent link to this post Posted by ceci3 » Wed Jan 17, 2018 12:59 pm

It's possible change the frequency of imported sound wav?
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Re: time

Permanent link to this post Posted by steve » Wed Jan 17, 2018 1:09 pm

Do you mean the "frequency" (pitch), or the "sample rate" (the number of samples per second)?

To change the frequency, use Change Pitch or Change Speed effects:
http://manual.audacityteam.org/man/change_pitch.html
http://manual.audacityteam.org/man/change_speed.html

To change the sample rate of the Audacity project, select the required rate in the "Project Rate" box: http://manual.audacityteam.org/man/sele ... .html#rate

To change the sample rate of a track, use "Tracks menu > Resample": http://manual.audacityteam.org/man/trac ... l#resample
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