PDL Demos: simple demos to prepare sound (sine waves) with PDL

[HaraldJoerg]

The demo uses PDL to calculate the samples of sine waves in one line, and then passes the "raw" PDL data to an external sound player.

I don't know whether this is good enough for a demo, but for me it was enlightening to see that raw sound can be calculated without looping over Perl arrays, and then directly passed to a sound player.

Since this is my first step with PDL, I'd welcome a review anyway. I might easily have misunderstood things.

[mohawk2]

Thank you for this! How do you feel about looking at Alien::Gnuplot and copying it to make an installer for a Linux/Windows/MacOS-capable sound player?

@zmughal What do you think? Do you have capacity to help Harald?

[coveralls]

Coverage: 32.491% (+0.007%) from 32.484% when pulling 2a04a34 on HaraldJoerg:sound-demo into 4f42076 on PDLPorters:master.

[mohawk2]

@HaraldJoerg Thank you for your continuing work on this! Please could you not merge master into your branch, but instead switch to your master, pull that, then rebase your demo branch against that, then force-push?

[HaraldJoerg]

Ouch... merging the master branch was not intended at all... My bad handling of the GitHub is to blame.

About creating an Alien module for a player: I feel that the added value is too small if it is just for running a demo. I am still unsure where my experiments with sound will float to. PDL ndarrays are not too far away from Microsoft WAV files which can be played on any platform because they contain the necessary metadata...