1. A hearing device system comprising a hearing device and a control device, the control device comprising: a signal interface that is adapted to receive data representing the acoustic environment external to the ear, and transmit an optimal algorithm to the hearing device; and a module for analyzing the data representing the acoustic environment external to the ear, and calculating the optimal algorithm for digital signal processing, the control device being operable to be responsive to the acoustic environment data transmitted thereto to automatically derive the optimal algorithm based upon the data and to transmit the optimal algorithm to the hearing device; wherein the hearing device is adapted to receive the optimal algorithm transmitted thereto by the control device and to perform speech enhancement in real time using the received optimal algorithm.