A visual graph is minimally a relationship between a series of points. The simplest auditory graph is a series of notes. This graph displays an increasing series of points.
The last graph doesn't contain a lot of information. It has no context, such as x and y axes in visual graphs, to ground the graph in a larger environment. The following graph adds a time context, playing every other note.
You can also add context to the data, such as playing the lowest note of the range. As the point increases, the context indicates the distance the point has gone from its lowest value.
This example puts both contexts together. The time context is changed to once every 5 points.
You can play two instruments at once.
The problem with the last example is that it is difficult to distinguish the two lines. One way is to distinguish the instruments.
We can also play different types of expressions. The first auditory graph plays a square function while the second plays a sine function. The examples also demonstrate playing the points at different speeds.
Putting all the graphs together, without context, sounds like this:
Due to the speed of the playback, it is difficult to tell the instruments apart. This example slows down the graph and increases the minimum and maximum playable range.
Now that you know the basics of auditory graphs, try to apply them to real data. The graph below is a rendition of high and low tides for Baker Bay, Washington, for October 1-14, 2007.