Abstract: The present invention provides an audio system in an electronic musical instrument which can determine the characteristics of a reproduced sound automatically or simply for matching with the environment. An infrared ray emitter and an infrared ray receiver are mounted at the back side of the electronic musical element (such as an electronic piano). In case that the electronic musical instrument is placed adjacent to a wall, an infrared ray emitted from the infrared ray emitter is reflected on the wall and received by the infrared ray receiver. When the reflection of the infrared ray received by the infrared ray receiver exceeds a predetermined level, a CPU judges that the electronic musical instrument is located adjacent to the wall and transmits a coefficient indicative of a highpass filtering profile to a frequency characteristic adjusting circuit.

Abstract: The present invention provides an audio system in an electronic musical instrument which can determine the characteristics of a reproduced sound automatically or simply for matching with the environment.

Abstract: A resin composition for use in a solder resist ink, said composition comprising as essential ingredients(A) an epoxy vinyl ester resin solution obtained by dissolving (A-a) an epoxy vinyl ester resin obtained by reacting a phenol novolak-type epoxy resin and/or a cresol novolak-type epoxy resin with 0.40 to 0.85 mol, per epoxy group of the epoxy resin, of an unsaturated monobasic acid in (A-b) an organic and/or (A-c) at least one photopolymerizable polyfunctional vinyl monomer selected from the group consisting trifunctional or higher polyoxyalkylene glycol poly(meth)acrylates, poly(meth)acrylates of polyoxyalkyl isocyanurates and poly(meth)acrylates of acetal compounds,(B) a photopolymerization initiator, and(C) a curing agent of an amino group and/or imino group-containing epoxy resin.