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:
Jul. 18, 1995
Filed:
Feb. 09, 1993
Yoshikatsu Watanabe, Iwaki, JP;
Takashi Miyake, Iwaki, JP;
Masatoshi Ito, Iwaki, JP;
Yoshio Imanishi, Iwaki, JP;
Alpine Electronics Inc., Tokyo, JP;
Abstract
An automatic volume control to prevent the listener from having an odd sensation is obtained with a plurality of conditions taken into considerations. A plurality of control rules required to infer using fuzzy logic a volume correcting value on the basis of frequency band component levels, L, M and H and a volume level V are stored beforehand in a volume correcting value inferring portion 13. The volume correcting value inferring portion 13 obtains inference results of the individual control rules on the basis of the individual frequency band component levels L, M, H input from a filter circuit 12 and the volume level input from an audio reproducing portion 14, obtains a weighted mean of the respective inference results as a volume correcting value Z, and inputs the volume correcting value to the audio reproducing portion 14 to automatically correct the volume. Furthermore, since a degree with which each of the control rules is associated with volume correction differs, an adjustment coefficient corresponding to each of the degrees is stored beforehand. A weighted mean of the values obtained by multiplying the inference results of the control rules by the corresponding adjustment coefficients is the volume correcting value.