A self-illuminating video screen system employing a concave display surface which provides for enhanced depth cueing. Converted input data may then be provided to a conventional colorant limitation algorithm for performing colorant limitation. Delays may be further reduced by combining analysis operations with write or move operations. The frequency variance is based, at least in part, on frequencies of Fast Fourier Transforms of the received signal pulses. A fragrance andor a pesticide may be added to the cottonseeds. Output signals from the mixing circuitry are selectively coupled through a variable delay line to synchronize two clock signals.