[android-developers] Re: how to make sound hz?
thanks for all comments. does anyone have a simple source demo. I could try that buffer[i] = (short) ( Math.sin((2. * Math.PI * i * f) / samplerate) * Short.MAX_VALUE ) ... and what afterwards, how to play it? I am just wondering ( please i am a total newbie in sound) when I fill always a buffer like above... how long is that sound?? I would be happy to create that sounds in realytime and not always had to create some seconds --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: how to make sound hz?
On 1 sep, 10:01, guruk ilovesi...@gmail.com wrote: thanks for all comments. does anyone have a simple source demo. I could try that buffer[i] = (short) ( Math.sin((2. * Math.PI * i * f) / samplerate) * Short.MAX_VALUE ) ... and what afterwards, how to play it? I am just wondering ( please i am a total newbie in sound) when I fill always a buffer like above... how long is that sound?? That depends on how many samples you write. The AudioTrack object plays samples at a certain rate, for example 22050 Hz. To create a 1 second tone, you would thus have to write 22050 samples. I am not familiar with android's AudioTrack interface, but I'm sure the reference manual will help you there. I suppose when you call play () it will start playing as soon as you write enough data to it with write(). So you can generate the tone while it's playing. It's not a completely trivial subject as you have to get into how digital audio actually works, so if you're completely new to that you might want to try to find some kind of library to help you out. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: how to make sound hz?
You could use AudioTrack. But you will need to create the data to send to it. On Aug 31, 2:19 pm, guruk ilovesi...@gmail.com wrote: sorry i just dont find that simple thing. how to create a tone lets say 10khz / 5 secs something like that,, just play a individual created sound, not playing a mpg or so? any example will be helpful thx chri --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: how to make sound hz?
You will have to create the wave data yourself using a sine-function. Fill a buffer of shorts (for 16 bit audio) with something like this: buffer[i] = (short) (Math.sin(((double) i / samplerate) * f) * Short.MAX_VALUE); (please correct me if I'm wrong) If you need a 5 seconds tone, I suppose you could just fill a buffer of size 5 * samplerate, but you could also try something smart with a loop and repeatedly feed the same buffer to the AudioTrack object. Just be aware of rounding errors and aliasing. On 31 aug, 20:28, Eduardo Aquiles dudu...@gmail.com wrote: You could use AudioTrack. But you will need to create the data to send to it. On Aug 31, 2:19 pm, guruk ilovesi...@gmail.com wrote: sorry i just dont find that simple thing. how to create a tone lets say 10khz / 5 secs something like that,, just play a individual created sound, not playing a mpg or so? any example will be helpful thx chri --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: how to make sound hz?
I'm sorry, the formula is wrong. I think it's buffer[i] = (short) ( Math.sin((2. * Math.PI * i * f) / samplerate) * Short.MAX_VALUE ) But I'm not sure. I guess 3 AM is not the time to think about this. Anyway it should give you an idea of how to do it. On 1 sep, 02:23, Bart van Wissen bartvanwis...@gmail.com wrote: You will have to create the wave data yourself using a sine-function. Fill a buffer of shorts (for 16 bit audio) with something like this: buffer[i] = (short) (Math.sin(((double) i / samplerate) * f) * Short.MAX_VALUE); (please correct me if I'm wrong) If you need a 5 seconds tone, I suppose you could just fill a buffer of size 5 * samplerate, but you could also try something smart with a loop and repeatedly feed the same buffer to the AudioTrack object. Just be aware of rounding errors and aliasing. On 31 aug, 20:28, Eduardo Aquiles dudu...@gmail.com wrote: You could use AudioTrack. But you will need to create the data to send to it. On Aug 31, 2:19 pm, guruk ilovesi...@gmail.com wrote: sorry i just dont find that simple thing. how to create a tone lets say 10khz / 5 secs something like that,, just play a individual created sound, not playing a mpg or so? any example will be helpful thx chri --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
[android-developers] Re: how to make sound hz?
On Aug 31, 8:23 pm, Bart van Wissen bartvanwis...@gmail.com wrote: Additionally I think it's also possible to do midi through jet? And if one isn't too particular about the sound, playing a touch tone digit is by far the simplest You will have to create the wave data yourself using a sine-function. sorry i just dont find that simple thing. how to create a tone lets say 10khz / 5 secs --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
