Simple symmetrical wave RMS DEMO using awk. Post: 303003027

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Operating Systems OS X (Apple) Simple symmetrical wave RMS DEMO using awk. Post 303003027 by Corona688 on Wednesday 6th of September 2017 06:22:27 PM

09-06-2017

Registered User

Your sample rate is way too low. It's just like trying to mathematically approximate the volume of a teapot by calculating the volume of a cube. Far too approximate to be useful!

When I plot your sine wave data, it looks awfully triangular. The crucial area going through the origin, accounting for the vast majority of the waveform, is a straight line from 38 to 217 -- and being symmetrical, can't be anything but a straight line. There's not enough points to represent anything else.

Mathematically speaking, triangle waves and square waves include higher frequencies than their base frequencies. Without a high enough sample rate to catch them, this information is thrown out like a brutal low pass filter. (Or worse, included as aliasing artifacts.)

Your waveforms should not be 8 points per wave. 16 at bare minimum, probably, but why not 1024? Then you'd see reliable differences, all the time.

Last edited by Corona688; 09-06-2017 at 07:42 PM..

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LEARN ABOUT DEBIAN

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)