[PlanetCCRMA] sound programming

Kai Vehmanen kai.vehmanen@wakkanet.fi
Sun Feb 1 14:39:01 2004

On 1 Feb 2004, Christoph Lehmann wrote:

> I need to synthesize/generate simple sinus tones, which last for a certain time 
> (e.g. 100ms) and have a fade-in and a fade-out of each e.g. 5ms. Lot many of 
> such pieces I need to append to each other

Here's how you can do it with Ecasound:

- tone 1
    - 880Hz sine, generated with 'sine_fcac' LADSPA plugin (id=1047)
    - 5ms fade-in 
    - after 90ms, a 5ms fade-out
    - output to 'foo.wav'

ecasound -b:1 -i null -el:sine_fcac,880,1 -ea:100 -kl:1,0,100,0.005 \
    -ea:100 -kl2:1,100,0,0.095,0.005 -o foo.wav -t:0.100

- tone 2
    - add 440Hz sine after the previous one
    - similar 5ms fadeins and fadeouts

ecasound -b:1 -i null -el:sine_fcac,440,1 -ea:100 -kl:1,0,100,0.005 \ 
    -ea:100 -kl2:1,100,0,0.095,0.005 -o foo.wav -y:0.100 -t:0.100

More info can be found at:

Ecasound is part of PlanetCCRMA, so you might already have it installed.

 Audio software for Linux!