24. A system for use in communicating speech signals received from a transmitting party, the system comprising: a receiver adapted to receive a narrowband signal corresponding to a narrowband version of speech utterances of the transmitting party and to receive speaker-dependent data correlating narrowband versions of the speech utterances of the transmitting party with corresponding wideband versions of the speech utterances of the transmitting party; an analyzer adapted to identify selected portions of the speaker-dependent data that best correspond to the received narrowband signal; and a wideband signal generator adapted to generate a wideband speech signal using the selected portions of the speaker-dependent data identified by the analyzer.
24. A system for use in communicating speech signals received from a transmitting party, the system comprising: a receiver adapted to receive a narrowband signal corresponding to a narrowband version of speech utterances of the transmitting party and to receive speaker-dependent data correlating narrowband versions of the speech utterances of the transmitting party with corresponding wideband versions of the speech utterances of the transmitting party; an analyzer adapted to identify selected portions of the speaker-dependent data that best correspond to the received narrowband signal; and a wideband signal generator adapted to generate a wideband speech signal using the selected portions of the speaker-dependent data identified by the analyzer. 26. The system of claim 24 , where the speaker-dependent data comprises speaker-dependent parameters of a neural network used in the generation of the wideband speech signal.