I really don't know if the tones produced are indeed at the right frequencies... It sounds right to me but I'm no expert

I'm not an expert too, but the generated tones are quite different from those generated by "dtmfdial"...
Based on what I found on http://www.hut.fi/~then/mytexts/dtmf_generation.html, I modified your prog :

for my $tone (@tones) {
  my @hz = map { 2 * $pi * $_ } @{$dtmf{$tone}};
  add_tone(@hz);
}
[download]

(note the factor '2')

and now I got (what I think to be) similar tones...
I also had to modify $duration to to have the exact same output as dtmfdial but that's just a detail


"Only Bad Coders Code Badly In Perl" (OBC2BIP)

---

---

• Are you posting in the right place? Check out Where do I post X? to know for sure.
• Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:

  <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>

• Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
• Want more info? How to link or How to display code and escape characters are good places to start.