Simple tone to audio card speakers

[cronk]

I currently use Audio::Beep to produce simple sine wave tones to my pc speaker. beep(324,1500) 324Hz for 1500 milliseconds for example. Is there a way or CPAN package that will allow such simple requests to be played through the standard speakers via the sound card? Thanks.

[idsfa]

The Audio namespace seems to have several options. It looks like Audio::Play is the most portable.

  use Audio::Data;
  use Audio::Play;
  
  $audio = Audio::Data->new(...)
  
  $svr = Audio::Play->new;
  
  $svr->play($audio);

Audio::DSP or Audio::OSS may be good options on Linux.

[Joost]

Audio::Play and SDL can both play sample files in a fairly portable way. Audio::Play can also take a buffer of generated samples. I'm currently working on a module that can generate all kinds of audio streams, but it doesn't really have as simple an interface as Audio::Beep.

If you want to experiment, you can also try my very new Audio::PortAudio module (should be on CPAN soon - i uploaded it 2 hours ago). It does more or less the same thing Audio::Play does, but also does input and multiple channels.

[zentara]

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);
        }
}

[Anonymous Monk]

Strange for both Audio::DSP and Audio::port I get a vast number of the same errors when trying to install either....

[cronk]

Well I got the Audio::DSP to install on a different linux box, so I am playing with it now. Would it be too much to ask what the code would be to play a tone of 300 Hz? Thanks :-) I figured out what the frequency control is. I appears that Audio::DSP doe not lend itself to playing a tune. Am I mistaken?