5. The system as claimed in claim 4 , wherein one of said plurality of strategies is to inform a user of environment conditions and signal quality, and provide said user with corresponding solutions.
4. The system as claimed in claim 3 , wherein said environment parameter generator includes an SNR calculator, a probability calculator, and a confidence measure, for calculating said SNR, said probability of said input signal being speech, and said confidence index of said system processing said input signal, respectively.