Generate a tone using ruby?

Ruby
1

Hey everyone, I’m looking for a simple way to generate a tone in ruby .
. . any suggestions?

2

Jeremiah D. wrote:

Hey everyone, I’m looking for a simple way to generate a tone in ruby .
. any suggestions?

–
Posted via http://www.ruby-forum.com/.

print “\a”

3

William J. wrote:

Jeremiah D. wrote:

Hey everyone, I’m looking for a simple way to generate a tone in ruby .
. any suggestions?

–
Posted via http://www.ruby-forum.com/.

print “\a”

Well, yeah sure. What I’d like to be able to do is generate a tone of a
specific frequency. Like an A note, or a D sharp.

4

Jeremiah D. wrote:

specific frequency. Like an A note, or a D sharp.

I presume you want to play it out the speaker? I’m not sure if there’s a
portable way to do that, but in most unices it would be a matter of
sending the audio data for that frequency to a special file, e.g.
/dev/dsp. Or perhaps you want to save to a file. In either case, esp.
the latter, ruby/audio would be worth a look.

http://hans.fugal.net/src/ruby-audio/

5

Thanks William and Hans. William, if I was on windows that probably
would’ve helped.

Hans, I don’t necessarily need to save to file - it could be handy
though. I’ll check out ruby-audio.

I really need to learn not to post these help requests when I’m
sleep-deprived - I leave out vital information like what exactly I want
to do, and what OS I’m running on.

I want to generate the sound real-time - so I guess I’ll need to figure
out how to send it to /dev/dsp or /dev/audio or whatnot.

6

Jeremiah D. [email protected] wrote:

I want to generate the sound real-time - so I guess I’ll need to figure
out how to send it to /dev/dsp or /dev/audio or whatnot.

Something like this might work on *unix :

Samplerate = 8000

def beep(frequency, amplitude, duration)

    f = File.open("/dev/dsp", "w")

    wave = ""

    0.step(duration, 1.0/Samplerate) do |t|
            y = Math.sin(t * frequency) * 50 + 127;
            wave << y.to_i.chr
    end

    f.write(wave)

end

beep(2000, 100, 1)

this code assumes the default settings of your soundcard are 8000 hz, 8
bits samples, signed, one channel. If you want more control over these
values, you will have to do fiddling with OSS IOCTL’s or alsa libraries.

7

Jeremiah D. wrote:

Well, yeah sure. What I’d like to be able to do is generate a tone of a
specific frequency. Like an A note, or a D sharp.

–
Posted via http://www.ruby-forum.com/.

require “Win32API”
Beep = Win32API.new(“kernel32”, “Beep”, [“I”, “I”], ‘v’)
def beep freq, duration
Beep.call(freq, duration)
end

beep 600, 400