A pattern recognition ANN that acts as its own in-band and/or bandpass filter

An orthonormal neural network (ONN) is described. The ONN is a single-layer neural network that mimics the quadratic phase relationship between the adjacent 'simple' cells in the visual cortex. It can perform as a pattern recognition network that can act as its own in-band filter and/or bandpass filter. The system design of a single-stage electrooptical ONN that classifies in the forward and filters in the reverse direction is described.<>