1. A nonlinear oscillator, comprising: a neural network including an internal representation of broad band chaos and comprising a plurality of neural network inputs for simultaneously receiving an m-dimensional input vector, the neural network further including a neural network output for outputting an n-dimensional output vector in response to the m-dimensional input vector; and feed back control means for controlling magnitude and phase of said n-dimensional vector to obtain a modified output vector and for storing a plurality of samples of the modified output vector at selected taps of m delay lines and for applying an outside signal to said m delay lines to get said oscillator started to oscillate.