Fig. 1. Separation of a mixed electric organ discharge (EOD) recording into pulses from males and females using cross correlation analysis. (A) The original mixed recording voltage (V) versus time (s). Exemplar male and female EOD templates are expanded on the right. (B) (V^*m)² as function of time. Where V is the original voltage trace, m is the male exemplar EOD and the operator ^* is the cross correlation. All squared coefficients are positive. (C) The same for the female template. To the right in A and B (V^*m)² is compared with (V^*f)² for a male EOD showing how the cross correlation is higher for the male (green) than female (red) model; C shows the same for a female EOD. EODs are subsequently identified for every pulse in the 2-s recording. (D,E) Inter-pulse intervals versus time for male and female, respectively.