A device for sensing whether a driver has been drinking by analyzing the driver's voice, which includes a parameter extractor for producing a parameter corresponding to a linear prediction coefficient-cepstrum coefficient extracted from a digital signal obtained by converting the sound of the voice command, a storage device for storing a reference parameter extracted from the voice of the driver when the driver is sober, a comparator for comparing a current parameter extracted by the extractor with the reference parameter so as to produce a difference signal representing the deviation, and a decision circuit for determining whether the driver has been drinking in accordance with the deviation value. The parameter extractor generates the linear prediction coefficient-cepstrum coefficient after producing a linear prediction coefficient by performing auto-correlation on the digital voice signal.
In a voice recognition automobile vehicle capable of recognizing a human voice, an apparatus and method for prevention of driving of motor vehicle under the influence of alcohol (DUI) and prevention of vehicle theft, are provided in which a voice and a voice secret code of at least one authorized driver is stored through the voice recognition apparatus by learning and then only an authorized driver who is not determined to be legally drunk and possesses the same voice and voice secret code as the stored voice and voice secret code can be allowed to start to drive the vehicle. Only an authorized driver having the same voice and voice secret code and not determined to be legally drunk can start the engine of the vehicle.
A voice control system receives a voice command from a user via a microphone. A command executability determination circuit determined whether the voice command is executable in the current function setting of a target device controlled by the voice control system. If the command is executable, the command is executed. If the command is inexecutable, a proper usage of the voice command and executable commands related to the voice command are provided to the user. Then, the user is prompted to use one of the executable commands. In other words, the user is notified of the reason why the voice command is not executed and a proper usage of the voice command.
An automatic dialog system capable of keeping a drive awake while driving during a long trip or one that extends into the late evening. The system carries on a conversation with the driver on various topics utilizing a natural dialog car system. The system includes an automatic speech recognition module, a speech generation module which includes speech synthesis or recorded speech, and possibly dynamically combined speech synthesizer and recorded speech, and a natural language processing module. The natural dialog car system analyzes a driver's answer and the contents of the answer together with his voice patterns to determine if he is alert while driving. The system warns the driver or changes the topic of conversation if the system determines that the driver is about to fall asleep. The system may also detect whether a driver is effected by alcohol or drugs.
