* is 440 Hz the true harmonic wave @ 2014-03-31 5:36 Joël Krähemann 2014-03-31 7:45 ` Clemens Ladisch 0 siblings, 1 reply; 6+ messages in thread From: Joël Krähemann @ 2014-03-31 5:36 UTC (permalink / raw) To: alsa-devel Is 440 Hz the true harmonic wave? Is there a constant for it in glibc, like M_PI? ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: is 440 Hz the true harmonic wave 2014-03-31 5:36 is 440 Hz the true harmonic wave Joël Krähemann @ 2014-03-31 7:45 ` Clemens Ladisch 2014-03-31 8:20 ` Joël Krähemann 0 siblings, 1 reply; 6+ messages in thread From: Clemens Ladisch @ 2014-03-31 7:45 UTC (permalink / raw) To: Joël Krähemann, alsa-devel Joël Krähemann wrote: > Is 440 Hz the true harmonic wave? 440 Hz is a frequency, not a wave. A single sine wave does not have overtones, so it is not possible to apply the term "harmony". I do not understand what you mean with "true". > Is there a constant for it in glibc, like M_PI? What would be the use of a definition like "#define HZ_440 440"? Regards, Clemens ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: is 440 Hz the true harmonic wave 2014-03-31 7:45 ` Clemens Ladisch @ 2014-03-31 8:20 ` Joël Krähemann [not found] ` <CAFz=ag7Xgvjq6JL7i=KMjCoh==3EDw2Y-NSoeBm3hnjKt2ZDrw@mail.gmail.com> 0 siblings, 1 reply; 6+ messages in thread From: Joël Krähemann @ 2014-03-31 8:20 UTC (permalink / raw) To: Clemens Ladisch; +Cc: alsa-devel On Mon, 2014-03-31 at 09:45 +0200, Clemens Ladisch wrote: > Joël Krähemann wrote: > > Is 440 Hz the true harmonic wave? > > 440 Hz is a frequency, not a wave. > > A single sine wave does not have overtones, so it is not possible to > apply the term "harmony". > > I do not understand what you mean with "true". > > > Is there a constant for it in glibc, like M_PI? > > What would be the use of a definition like "#define HZ_440 440"? > > > Regards, > Clemens I believe that 440 Hz is an approximation rather than true harmonic on it's pressure. Or am I wrong? Sine is harmonic in default arc. thank you! Joël ^ permalink raw reply [flat|nested] 6+ messages in thread
[parent not found: <CAFz=ag7Xgvjq6JL7i=KMjCoh==3EDw2Y-NSoeBm3hnjKt2ZDrw@mail.gmail.com>]
* Re: is 440 Hz the true harmonic wave [not found] ` <CAFz=ag7Xgvjq6JL7i=KMjCoh==3EDw2Y-NSoeBm3hnjKt2ZDrw@mail.gmail.com> @ 2014-03-31 9:30 ` Joël Krähemann 2014-03-31 9:49 ` Joël Krähemann 0 siblings, 1 reply; 6+ messages in thread From: Joël Krähemann @ 2014-03-31 9:30 UTC (permalink / raw) To: Felix Homann; +Cc: alsa-devel, Clemens Ladisch On Mon, 2014-03-31 at 10:27 +0200, Felix Homann wrote: > 2014-03-31 10:20 GMT+02:00 Joël Krähemann <joel@weedlight.ch>: > > > I believe that 440 Hz is an approximation rather than true > harmonic on > it's pressure. Or am I wrong? Sine is harmonic in default arc. > > > > What are you talking about??? About scale. Am I wrong when I believe 440 Hz has physical property to be harmonic? ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: is 440 Hz the true harmonic wave 2014-03-31 9:30 ` Joël Krähemann @ 2014-03-31 9:49 ` Joël Krähemann 2014-03-31 9:57 ` Joël Krähemann 0 siblings, 1 reply; 6+ messages in thread From: Joël Krähemann @ 2014-03-31 9:49 UTC (permalink / raw) To: Felix Homann; +Cc: alsa-devel, Clemens Ladisch On Mon, 2014-03-31 at 11:30 +0200, Joël Krähemann wrote: > On Mon, 2014-03-31 at 10:27 +0200, Felix Homann wrote: > > 2014-03-31 10:20 GMT+02:00 Joël Krähemann <joel@weedlight.ch>: > > > > > > I believe that 440 Hz is an approximation rather than true > > harmonic on > > it's pressure. Or am I wrong? Sine is harmonic in default arc. > > > > > > > > What are you talking about??? > > About scale. Am I wrong when I believe 440 Hz has physical property to > be harmonic? > > > > _______________________________________________ > Alsa-devel mailing list > Alsa-devel@alsa-project.org > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel Note: 1/45 is 90 degree. (250000000 * (1 / 45)) calculated with calculator on GNU/Linux equals: 5555555.555555556 This, some handy threading functions and nanosleep makes my application run with a thread tree. sf.net/p/ags As I'm reflecting I recognize that there are 10^3 more zero's as I wanted. I give it a try with: 250000 That would result about 4𝜇s That could you have seen if you didn't ban me from linux-kernel@vger.kernel.org: GNU/Linux is great! This changed my life: /* and now async */ { static const struct timespec req = { 0, (250000000 * 1 / 45), }; if(!AGS_IS_DEVOUT_THREAD(thread)){ nanosleep(&req, NULL); } } _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: is 440 Hz the true harmonic wave 2014-03-31 9:49 ` Joël Krähemann @ 2014-03-31 9:57 ` Joël Krähemann 0 siblings, 0 replies; 6+ messages in thread From: Joël Krähemann @ 2014-03-31 9:57 UTC (permalink / raw) To: Felix Homann; +Cc: alsa-devel, Clemens Ladisch On Mon, 2014-03-31 at 11:49 +0200, Joël Krähemann wrote: > On Mon, 2014-03-31 at 11:30 +0200, Joël Krähemann wrote: > > On Mon, 2014-03-31 at 10:27 +0200, Felix Homann wrote: > > > 2014-03-31 10:20 GMT+02:00 Joël Krähemann <joel@weedlight.ch>: > > > > > > > > > I believe that 440 Hz is an approximation rather than true > > > harmonic on > > > it's pressure. Or am I wrong? Sine is harmonic in default arc. > > > > > > > > > > > > What are you talking about??? > > > > About scale. Am I wrong when I believe 440 Hz has physical property to > > be harmonic? > > > > > > > > _______________________________________________ > > Alsa-devel mailing list > > Alsa-devel@alsa-project.org > > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel > > Note: 1/45 is 90 degree. > > (250000000 * (1 / 45)) calculated with calculator on GNU/Linux equals: > 5555555.555555556 > > This, some handy threading functions and nanosleep makes my application > run with a thread tree. > > sf.net/p/ags > > As I'm reflecting I recognize that there are 10^3 more zero's as I > wanted. I give it a try with: 250000 > > That would result about 4𝜇s > > That could you have seen if you didn't ban me from > linux-kernel@vger.kernel.org: > > GNU/Linux is great! > > This changed my life: > > /* and now async */ > { > static const struct timespec req = { > 0, > (250000000 * 1 / 45), > }; > > if(!AGS_IS_DEVOUT_THREAD(thread)){ > nanosleep(&req, NULL); > } > } > > _______________________________________________ > Alsa-devel mailing list > Alsa-devel@alsa-project.org > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel It runs into a deadlock! It could practically intefer with any software. But back to topic: I'm doing softsynth. _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel ^ permalink raw reply [flat|nested] 6+ messages in thread
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2014-03-31 5:36 is 440 Hz the true harmonic wave Joël Krähemann
2014-03-31 7:45 ` Clemens Ladisch
2014-03-31 8:20 ` Joël Krähemann
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2014-03-31 9:30 ` Joël Krähemann
2014-03-31 9:49 ` Joël Krähemann
2014-03-31 9:57 ` Joël Krähemann
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