The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 02, 1986
Filed:
Jan. 06, 1983
Abstract
An automotive vehicle speech recognition system sets a recording-mode reference threshold level to be lower than a recognition-mode reference threshold level. Therefore, a spoken instruction supplied to the system in a low voice while the vehicle is parked in a quiet place during a record mode can be correlated with an instruction uttered in a loud voice during a recognition mode while the vehicle is running in a noisy environment. During the record and recognition modes reference threshold signals derived by smoothing a spoken instruction are multiplied by two different factors such that the reference threshold in the recognition mode has a greater multiplication factor than the reference threshold in the record mode. While the driver is uttering a command a first smoothed version of the utterance power spectrum is compared with a fixed reference threshold level, set to the value of a second smoothed version of the utterance power spectrum at the time the utterance began. While no command is being uttered the reference threshold varies in accordance with the second smoothed version. The first smoothed version includes higher frequency components than the second smoothed version.