sine generated wav gets cut

[jakob.flierl (Bugzilla)]

Hi ecasound-list, running eca v2.8.1-2 on Ubuntu 11.10 amd64:

$ ecasound -f:16,2,96000 -i:tone,sine,50 -o:sndfile,sine-50.wav -t:0.02

should get me a sine wav, where t = 1 / 50 == 0.02sec, ie.: a wav file
with one full period of a sine curve,

however all ecasound generates is a cut wav file, where t < 0.02, see here:

* http://db.koppi.me/ubuntu/11.10/ecasound/sine.png

Any hints, what's wrong with this? Kind regards & thanks in advance,
Jakob

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[Artur-16]

Hello.

It is somehow related to buffering.
Add -b:2 to command line (which theoretically sets buffer size to 2 samples). Experiment with other values. It probably still won't be ideal, but better than without this parameter.

--
Artur

Poniższą wiadomość napisał(a) Jakob Flierl <jakob.flierl@...> w dniu 04.01.2012 16:47:

> Hi ecasound-list, running eca v2.8.1-2 on Ubuntu 11.10 amd64:
>
> $ ecasound -f:16,2,96000 -i:tone,sine,50 -o:sndfile,sine-50.wav -t:0.02
>
> should get me a sine wav, where t = 1 / 50 == 0.02sec, ie.: a wav file
> with one full period of a sine curve,
>
> however all ecasound generates is a cut wav file, where t<  0.02, see here:
>
> * http://db.koppi.me/ubuntu/11.10/ecasound/sine.png
>
> Any hints, what's wrong with this? Kind regards&  thanks in advance,
> Jakob
>
> ------------------------------------------------------------------------------
> Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex
> infrastructure or vast IT resources to deliver seamless, secure access to
> virtual desktops. With this all-in-one solution, easily deploy virtual
> desktops for less than the cost of PCs and save 60% on VDI infrastructure
> costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox
> _______________________________________________
> Ecasound-list mailing list
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> https://lists.sourceforge.net/lists/listinfo/ecasound-list
>

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[jakob.flierl (Bugzilla)]

Hi Artur,

thanks for the hint. Changing the buffer size using -b:2 fixed this.

Kind regards,
Jakob

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[Julien Claassen-2]

Hello Jakob!
   Another possibility would be to use a LADSPA plugin for the sine wave.
There's the sin_cos plugin from the swh LADSPA plugins. It generates a sine
wave at your desired pitch. It outputs a sine wave of that frequency in the
left channel and a cosine wave in the right channel.
   I seem to remember, that there was another plugin in the cmt suite (the
basic plugins released by Richard E. Furse.
   You could also use csound, if you still don't get precise results. In csound
you might have something like:
sine.orc
sr = 96000
kr = 9600
ksmps = 10
nchnls = 1

instr 1
   a1 oscil 32767, 50, 1
   out a1
endin

sine.sco
f1 0 32768 10 1
i1 0 0.02
e

   the same result can be achieved with any other synthesizer language of your
choice.
   I hope this helps, although not very Ecasound-ish.
   Kind regards
           Julien

=-=-=-=-=-=-=-=-=-=-=-=-
Such Is Life: Very Intensely Adorable;
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======      Find my music at      ======
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[jakob.flierl (Bugzilla)]

Thanks Julien,

so for me the next logical step after successfully generating a sine
with ecasound is: How to generate an ascending shepard tone (using
only ecasound): http://en.wikipedia.org/wiki/Shepard_tone ? -- any
help is greatly appreciated.

Kind regards,
Jakob

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[Julien Claassen-2]

Hello Jakob!
   As far as I remmber - not having looked at the article - you need two
oscillators per note to get the Shepard scale. You could generage one octave
with ecasound, starting like this:
ecasound -a:1 -i tone,sine,440,0.2 -ea:100 -a:2 -i
playat,0.2,tone,sine,461,0.2 -ea:91 -a:3 -i playat,0.4,tone,sine,494,0.2
-ea:82 ... -a:all -o shepared.wav
   You get the picture. Set the notes right and the volumes. Then when you have
that, you could easily loop it:
ecasound -i audioloop,shepard.wav -o out.wav -t:260
   Or you can output to a device and stop, when ever you like.
   If I'm mistaken and the Shepard scale was one of the non-discrete scales,
then you can use controllers, but you might havge to use a ladspa sinewave
generator:
ecasound -i null -o shepard.wav -eli:1881,440,0 -klg:1,440,880,2,0,0,20,1
-ea:100 -klg:2,0,100,2,0,1,20,0
   this should generate a sine wave from 440 to 880 Hz in the space of 20
seconds and in volume ramping from 100 to 0%. You can use any other
controller, that might suite you better. You can use the -kos sine oscillator
for controlling the pitch and volume of the waveform. Again you can produce to
chains at once, that have both oscillators.
   I hope, that this is of some help.
   Warmly yours
           Julien

=-=-=-=-=-=-=-=-=-=-=-=-
Such Is Life: Very Intensely Adorable;
Free And Jubilating Amazement Revels, Dancing On - FLOWERS!

======      Find my music at      ======
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