Telephone speech recognition

A telephone speech recognition system is provided which has a high level of speech recognition regardless of various conditions of a telephone line. The system comprises speech analyzers 4 and 5, and reference speech model storages 7 to 9 corresponding to line connection data. A telephone line interface 1 having a line connection data acquisition function analyzes a call received from the telephone line for identifying the country, route, and other information of the call and transmits those line connection data to a line connection data processor 2. The line connection data processor 2 selects one of the acoustic analyzers 4 and 5 in response to the line connection data from the interface 1 and also one of the speech model storages 7 to 9. A speech pattern matcher 11 compares an acoustic vector train output of the selected acoustic analyzer with the speech models given from the selected reference speech model storage for speech recognition.