Speech recognition system for an automotive vehicle.

摘要

A speech recognition system for an automotive vehicle including a voice detecting means such that: the start of the spoken instruction is detected on the basis of the start detection threshold level varying according to the voltage level of an inputted spoken instruction signal including noise within the passenger compartment; however, the end of spoken instruction is detected on the basis of the end detection threshold level which is equal to or higher than that determined in detecting the start. Therefore, even if noise rises abruptly after the start of spoken instruction has been detected with a time delay, it is possible to detect the end of spoken instruction reliably. The system comprises a holding circuit (22) for holding the start-detection threshold level or a threshold level corrector (37) for increasing the start-detection threshold level to an appropriate level, etc., in addition to the conventional voice detecting means.