The Audio::DSP module allows you to write generated tones to the soundcard. The PDL::Audio module generates realistic bird calls from data. :-) The script below, generates a series of numbers, that is fed to the soundcard, play with it for different tones. 
#!/usr/bin/perl
use warnings;
use strict;
use Audio::DSP;
$| = 1;

my $sample_rate = 22050;   #44100 gives best sound, but highest cpu
                           #8000 works 
my $channels = 1;
my $format = AFMT_S16_LE;  #8 bit won't work on SBLive
my $buffer = 4096;

my $dsp = new Audio::DSP(buffer   => $buffer,
                      channels => $channels,
                      format   => $format,
                      rate     => $sample_rate);
$dsp->init() || die $dsp->errstr();

############################################################
my $freq_adj = .1;
my $vol = .5;
my $toggle = 1;

while(1){
  make_tone($freq_adj, $vol);

  if(($freq_adj > 4) or ($freq_adj < .1)){ $toggle *= -1;}

  $freq_adj += ($toggle * .001); #higher increment numbers are slower
                                 #0 is pure tone
}

sub make_tone {
     my $rad = 0;
     my ($freq_adj, $vol) = @_;
     while ( $rad < 6.283 ){
         $rad +=  $freq_adj;     
     my $raw = ($vol*32768) * sin($rad);    #max times
       my $num = pack( 'V', $raw  ); 
           $dsp->dwrite($num);
        }
}

[download]
I'm not really a human, but I play one on earth. Cogito ergo sum a bum

In reply to Re: Simple tone to audio card speakers by zentara
in thread Simple tone to audio card speakers by cronk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.