Lissajous figures

rtarbell · 26th October 2005, 03:55 PM

I read an article in the latest issue of AudioXpress, and it uses two Lissajous figures for music content comparison. I had two questions:

1. Are Lissajous figures taken at the source of the music, or are they taken after the power amplifier (so that the figure includes the effects of the amplifier)?

2. What are some characteristics to look for in Lissahous figures? For instance: one I know is that a squared off side indicates clipping.

Ron E · 28th October 2005, 01:23 AM

I haven't seen the article, how are they hooking up the scope?

If they are doing one channel for x and one for y, a mono signal would be a straight line and progressively more spacious albums would get more circular......

A Magnum Dynalab FM tuner had a lissajous figure for looking at signals, more of a qualitative light show than anything else.... AFAIK

26th October 2005, 03:55 PM	#1
rtarbell diyAudio Member Join Date: Sep 2005	Lissajous gifures I read an article in the latest issue of AudioXpress, and it uses two Lissajous figures for music content comparison. I had two questions: 1. Are Lissajous figures taken at the source of the music, or are they taken after the power amplifier (so that the figure includes the effects of the amplifier)? 2. What are some characteristics to look for in Lissahous figures? For instance: one I know is that a squared off side indicates clipping.

28th October 2005, 01:23 AM	#2
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	I haven't seen the article, how are they hooking up the scope? If they are doing one channel for x and one for y, a mono signal would be a straight line and progressively more spacious albums would get more circular...... A Magnum Dynalab FM tuner had a lissajous figure for looking at signals, more of a qualitative light show than anything else.... AFAIK __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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