Electrical audio signal processing systems and devices – Including amplitude or volume control – Automatic
Patent
1993-02-09
1995-07-18
Kuntz, Curtis
Electrical audio signal processing systems and devices
Including amplitude or volume control
Automatic
381 86, H03G 300
Patent
active
054349265
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.
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patent: 5204971 (1993-04-01), Takahashi et al.
Imanishi Yoshio
Ito Masatoshi
Miyake Takashi
Watanabe Yoshikatsu
Alpine Electronics Inc.
Bever Patrick T.
Klivans Norman R.
Kuntz Curtis
Lee Ping W.
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