38. Creating anti-Harmonic Bases

create anti-Harmonic Base: Index graph tab

Figure 38.1
Click on thumbnail for full size image.

Figure 38.1 shows an anti-Harmonic Base New dog, based on the existing anti-Harmonic Base dog, being created. This facility to create a record based on another is also available for graphs, Harmonics, anti-Harmonics and Variations.

An anti-Harmonic Base defines a table of delta frequencies; these can be directly entered or filled using the Fill controls, which allow a constant value or graph to be applied to a targeted range of indices. Fill controls are explained in more depth on page 36.

The idea is that each entry in the table in the Delta Frequency column adds an increment to a frequency multiple of the fundamental (or lowest) frequency, starting from 1 (which represents the fundamental/lowest frequency). For example, if there were three table entries:

Index number Delta Frequency Frequency Multiple
10.51.5
20.52
30.52.5

The first entry would be at 1.5 times the lowest frequency, the second at twice the lowest frequency, and the third at 2.5 times the lowest frequency; in other words, each entry adds to a cumulative frequency multiple. This cumulative frequency multiple is shown in the third column of the table, labelled Frequency Multiple.

The Index graph tab of figure 38.1 shows a bar-chart of the delta frequencies. In this example the bars are generally higher on the right hand side, indicating that frequencies selected for this anti-Harmonic Base are becoming more spread out at higher frequencies.

create anti-Harmonic Base: Anti-harmonic graph tab

Figure 38.2
Click on thumbnail for full size image.

Figure 38.2 shows the Anti-harmonic base tab of the anti-Harmonic Base New dog. Here you can see the cumulative effect of the delta frequency factors. X-axis values represent a frequency multiple of the fundamental or lowest frequency, which, unlike harmonics, need not be an integer multiple. The y-axis values of 1 are arbitrary here — an anti-Harmonic Base doesn't define amplitudes, that is the job of any anti-Harmonic (there may be more than one) that references it.

In this example the frequency multiples are more densely-spaced on the left-hand side of the graph; this indicates a concentration in the lower frequency multiples for this particular anti-Harmonic Base.