time

Para discutir de Audacity en Español
Forum rules
ImagePor favor tenga en cuenta que la mayor parte del personal de Audacity sólo habla Inglés, por lo que no podemos garantizar que sus preguntas en español sean respondidas.

Si su pregunta no ha sido contestada, y puede escribir/leer en Inglés, por favor pregunte en el área en Inglés correspondiente a su sistema operativo y versión de Audacity. Si es posible, por favor, responda a su pregunta en el foro en español y dar allí la dirección web de la pregunta que realizara en el Foro de Inglés.
ceci3
Posts: 7
Joined: Mon Jan 15, 2018 2:05 pm
Operating System: Windows 10

time

Post 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?

Trebor
Posts: 4649
Joined: Sat Dec 27, 2008 5:22 pm
Operating System: Windows Vista

Re: time

Post 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 775 times
or key-in "1","1","8".

ceci3
Posts: 7
Joined: Mon Jan 15, 2018 2:05 pm
Operating System: Windows 10

Re: time

Post by ceci3 » Tue Jan 16, 2018 12:26 pm

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

steve
Site Admin
Posts: 48206
Joined: Sat Dec 01, 2007 11:43 am
Operating System: Linux *buntu

Re: time

Post by steve » Tue Jan 16, 2018 2:46 pm

ceci3 wrote:0.000219 second?
Is that a typing error?
9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)

ceci3
Posts: 7
Joined: Mon Jan 15, 2018 2:05 pm
Operating System: Windows 10

Re: time

Post 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 765 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

Trebor
Posts: 4649
Joined: Sat Dec 27, 2008 5:22 pm
Operating System: Windows Vista

Re: time

Post 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 761 times

steve
Site Admin
Posts: 48206
Joined: Sat Dec 01, 2007 11:43 am
Operating System: Linux *buntu

Re: time

Post 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.
9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)

ceci3
Posts: 7
Joined: Mon Jan 15, 2018 2:05 pm
Operating System: Windows 10

Re: time

Post by ceci3 » Wed Jan 17, 2018 11:15 am

Thanks!!!!! :D :D :D :D :D

ceci3
Posts: 7
Joined: Mon Jan 15, 2018 2:05 pm
Operating System: Windows 10

Re: time

Post by ceci3 » Wed Jan 17, 2018 12:59 pm

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

steve
Site Admin
Posts: 48206
Joined: Sat Dec 01, 2007 11:43 am
Operating System: Linux *buntu

Re: time

Post 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
9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)

Post Reply