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Full Discussion: An Audio Function Generator...
Operating Systems OS X (Apple) An Audio Function Generator... Post 302969967 by wisecracker on Wednesday 30th of March 2016 05:13:11 PM
Old 03-30-2016
An Audio Function Generator...
Ok guys, gals and geeks...

As from today I am starting to learn awk in earnest doing something totally different.

I am going to create a pseudo-Audio_Function Generator centred around OSX 10.11.x minimum. The code below is a tester to see what the possibilities are.

All waveforms will be 6+ bit depth using ASCII characters decimal 32 - space to decimal 126 - tilde.

It requires SOX and I am not going to use any other source.

The code below is my starting point. All criticisms welcome...

I am now getting my head around making it fully programmable using awk.
The shell is SOOOO easy but this is new to me and I want to learn...

If you try it out the simple sinewave.raw file generated will only go from 500Hz to 6KHz...

Have fun... ;o)
Code:
#!/bin/sh
# FG.sh
awk '
# Clear the terminal window.
function cls()
{
	printf "\x1B[2J\x1B[H";
}

# User keyboard interrupt.
function keyboard( COMMAND )
{
	printf "Press <CR> to continue or QUIT<CR>:- ";
	getline COMMAND;
	if ( COMMAND == "QUIT" ) { exit 0 };
}
 
# Adjust the sample rate for SOX WRT its frequency.
function setrate( RATE )
{
	cls();
	FREQ=500;
	BYTES=8;
	RATE=16000;
	printf "Enter frequency required:- ";
	getline FREQ;
	RATE=(BYTES*FREQ);
	if ( RATE <= 4000 ) { RATE=4000 };
	if ( RATE >= 48000 ) { RATE=48000 };
	return RATE;
}

# Main loop...
function main()
{
	RATE=setrate();
	LOOPS=2;
	for ( LOOP = 1; LOOP <= LOOPS; ++LOOP ) { system ( "~/sox-14.4.2/sox -q -b 8 -r "RATE" -e unsigned-integer /tmp/sinewave8.raw -d trim 0 00:01 > /dev/null 2>&1" ) };
	keyboard( COMMAND );
}

# Now generate a simple sinewave and run the _main_ code.
BEGIN \
{
	system( ">" "/tmp/sinewave8.raw" );
	SINEWAVE8="Op}pN- -";
	for ( LOOP = 1; LOOP <= 16; ++LOOP ) { SINEWAVE8=SINEWAVE8 SINEWAVE8 };
	printf SINEWAVE8 > "/tmp/sinewave8.raw";
	cls();
	while( 1 ) { main() };
}'

 

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LEARN ABOUT DEBIAN

rdf::rdfa::generator::html::pretty::note

RDF::RDFa::Generator::HTML::Pretty::Note(3pm)		User Contributed Perl Documentation	     RDF::RDFa::Generator::HTML::Pretty::Note(3pm)

NAME

       RDF::RDFa::Generator::HTML::Pretty::Note - a note about something

DESCRIPTION

       Often you'll want to create your own subclass of this as the basic notes are pretty limited (plain text only).

   Constructor
       "$note = RDF::RDFa::Generator::HTML::Pretty::Note->new($subject, $text)"
	   $subject is an RDF::Trine::Node (though probably not a Literal!) indicating the subject of the note. $text is the plain text content of
	   the note.

   Public Methods
       "$note->is_relevent_to($node)"
	   $node is an RDF::Trine::Node. Checks if the subject of $note is $node.

	   Alias: is_relelvant_to.

       "$note->node($namespace, $tagname)"
	   Gets an XML::LibXML::Element representing the note. $namespace and $tagname are used to create the new element. If an unexpected
	   namespace or tagname is supplied, may die.

	   Expected namespace is 'http://www.w3.org/1999/xhtml'. Expected tagname is any XHTML tag that can contain text nodes.

BUGS

       Please report any bugs to <http://rt.cpan.org/>.

SEE ALSO

       RDF::RDFa::Generator, RDF::RDFa::Linter.

       <http://www.perlrdf.org/>.

AUTHOR

       Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

       Copyright (C) 2010 by Toby Inkster

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8 or, at
       your option, any later version of Perl 5 you may have available.

perl v5.12.4							    2011-07-06			     RDF::RDFa::Generator::HTML::Pretty::Note(3pm)
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