The present invention provides an apparatus for decoding and classifying a digital audio input signal and for reconstructing the digital audio input signal, so that when the reconstructed signal is converted to an analog signal by a digital to analog converter ("DAC"), the analog signal can drive a preamplifier,...http://www.google.com/patents/US5532950?utm_source=gb-gplus-sharePatent US5532950 - Dynamic digital filter using neural networks
