Abstract: A signal generator implements a dynamic behaviour described by differential equations specifying a predetermined functional relationship. The generator includes a mapping section for mapping inputs onto outputs according to a mathematical correspondence, differentiators at selective ones of the inputs for providing time-derivatives, and a feedback path for selectively coupling outputs to inputs, either directly or via the differentiators. The feedback path and differentiating means constrain the mapping and establish aforesaid relationship.

Abstract: An information processing system includes a feed-forward neural net that is functionally comprised of a plurality of interconnected neurons. At least a particular one of the neurons is operative to receive a plurality of input signals for in response thereto producing an output signal that is a function of the input signals, and of at least one of following quantities: a rate of change of at least one of the neuron input signals; a rate of change of the particular neuron output signal. The net exhibits dynamic behavior as represented by signal-dependent delays, signal dispersion and phase shifts. The net can be trained to display stimulus-response characteristics of substantially any dynamic system.

Abstract: In a device for converting visual images into representative sound information especially for visually handicapped persons an image processing unit is provided with a pipelined architecture with a high level of parallelisum. An image is scanned in sequential vertical scanlines and the acoustical representatives of the scanlines are produced in real time. Each scanline acoustical representation is formed by sinusoidal contributions from each pixel in the scanline, the frequency of the contribution being determined by the position of the pixel in the scanline and the amplitude of the contribution being determined by the brightness of the pixel.