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

uhd_siggen_gui

UHD_SIGGEN_GUI(1)						   User Commands						 UHD_SIGGEN_GUI(1)

NAME

       uhd_siggen_gui - GNU Radio signal generator using UHD hardware

SYNOPSIS

       uhd_siggen_gui: [options]

DESCRIPTION

       GUI to allow UHD supported hardware to be a signal generator.

OPTIONS

       -h, --help
	      show this help message and exit

       -a ARGS, --args=ARGS
	      UHD device address args , [default=]

       --spec=SPEC
	      Subdevice of UHD device where appropriate

       -A ANTENNA, --antenna=ANTENNA
	      select Rx Antenna where appropriate

       -s SAMP_RATE, --samp-rate=SAMP_RATE
	      set sample rate (bandwidth) [default=1000000.0]

       -g GAIN, --gain=GAIN
	      set gain in dB (default is midpoint)

       -f FREQ, --tx-freq=FREQ
	      Set carrier frequency to FREQ [default=mid-point]

       -x WAVEFORM_FREQ, --waveform-freq=WAVEFORM_FREQ
	      Set baseband waveform frequency to FREQ [default=0]

       -y WAVEFORM2_FREQ, --waveform2-freq=WAVEFORM2_FREQ
	      Set 2nd waveform frequency to FREQ [default=none]

       --sine Generate a carrier modulated by a complex sine wave

       --const
	      Generate a constant carrier

       --offset=OFFSET
	      Set waveform phase offset to OFFSET [default=0]

       --gaussian
	      Generate Gaussian random output

       --uniform
	      Generate Uniform random output

       --2tone
	      Generate Two Tone signal for IMD testing

       --sweep
	      Generate a swept sine wave

       --amplitude=AMPL
	      Set output amplitude to AMPL (0.0-1.0) [default=0.15]

       -v, --verbose
	      Use verbose console output [default=False]

SEE ALSO

       uhd_siggen(1)

uhd_siggen_gui 3.5						   December 2011						 UHD_SIGGEN_GUI(1)