Abstract: A rapidly soluble film-shaped preparation containing a drug and an edible polymer, wherein the breaking strength of a film thereof is from 200 to 3,000 g/?7 mm, the tensile strength of the film is from 200 to 3,000 g/15 mm, the water disintegration time Y [sec] is within 300 seconds (Y?300), and when the reciprocal [mg/mm2] of the specific surface area [mm2/mg] of the film is taken as X (X?0), the relationship of water disintegration time Y [sec] ?7500X2 is satisfied, and the rapidly soluble film-shaped preparation comprising one drug-containing layer, or having a support layer on one side or both sides of the drug-containing layer, wherein the edible polymer is hydroxypropyl cellulose and/or hydroxypropylmethyl cellulose, the compounding ratio of the drug is from 0.01 to 40% by weight based on the whole preparation, and that of the edible polymer is from 40 to 99.99% by weight based on the whole preparation.

Abstract: An apparatus for automatically controlling the sound volume of a sound producing apparatus based on ambient noise includes a microphone which detects the sound produced by the sound producing apparatus and ambient noise. Adaptive filters approximate, based on signals sent from the sound producing apparatus to speakers thereof, the characteristics of the sound components, relating to the sound produced by an individual speaker of the sound producing apparatus, which are received by the microphone. A subtractor subtracts the output of the adaptive filters from the output of the microphone to obtain a signal representing the ambient noise. The adaptive filters receive the signal representing the ambient noise and use this signal as a coefficient updating signal. A signal converter converts the signal representing ambient noise into an ambient noise level representing the volume of ambient noise.