7. The system of claim 6 , further comprising: a signal-to-noise ratio (SNR) detector that receives the enhanced speech signal, the noise reference signal and the acoustic signal to generate an SNR information signal; and a neural network training unit that receives the SNR information signal, generates an update signal based on the SNR information signal, and transmits the update signal to the neural network to cause updates to the weight parameter in the neural network.
8. The system of claim 7 , wherein the neural network training unit causes in-the-field weight updates to the neural network.