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M. C. Brown, A. C. Fisher, R. P. Hagan, A. Small; Decimation of Binary Sequences for Multifocal ERG Recording. Invest. Ophthalmol. Vis. Sci. 2008;49(13):2218. doi: https://doi.org/.
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© ARVO (1962-2015); The Authors (2016-present)
To optimise the decimation of binary sequences for use in multifocal recording with particular reference to use of short sequences, and to provide an educational tool.
We have created a mathematical tool to examine a binary sequence and check its properties. With a given set of restrictions entered by the user, such as the number of separate channels required, the number of base periods in the recording epoch, which (how many) higher-order Kernels to test for etc., the tool will find a set or sets of sequences from the master sequence which have the least number of possible overlaps or contaminations between channels. The figure below shows FOK/SOK kernel cross contamination using real data.
The task can be reduced to a set of formulae. Published examples of decimation include simple methods of selection of the stimulating sequences such as maximum or equal separation. Our tool shows these methods to be unsuitable.
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