VOICE INPUT SECTION DETERMINATION DEVICE, AURAL DATA EXTRACTION DEVICE, SPEECH RECOGNITION DEVICE, VEHICLE NAVIGATION DEVICE AND INPUT MICROPHONE

摘要

PROBLEM TO BE SOLVED: To remove effectively a noise component from an input signal even in a noisy environment, to execute excellently the determination of a voice input section, and to improve a recognition ratio of a speech of a speaker. SOLUTION: A voice microphone 19 and a noise microphone 20 are arranged in the same microphone assembly so as to have different directivities by 180 degrees respectively. A frame dividing part 29 generates aural signal data and noise signal data based on input signals of the voice microphone 19 and the noise microphone 20, and a determination part 39 of a voice section determination device 30 determines an input section of a voice relative to the aural signal data based on the difference of short-time powers between the aural signal data and the noise signal data.