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:
Oct. 23, 1984
Filed:
Nov. 30, 1981
Tetsuo Yamaguchi, Kawasaki, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
Disclosed is a musical envelope control device which is used in an electronic watch with a melody alarm function. The musical envelope control device comprises a memory which stores musical performance data representing pitches and durations of notes; an address counter; a pitch divider which receives pitch data and generates a tone signal in correspondence with the pitch data; a note control circuit which receives note duration data, divides the duration into a preset number of components and then generates a coded signal of a predetermined bit length for each duration component; an envelope decoder which is connected to the note control circuit and converts the coded signals to voltage signals in accordance with a predetermined conversion mode corresponding to a desired envelope waveform; and an envelope control circuit which produces a sound pressure signal having a stepped waveform in response to the voltage signal and which generates a sound signal by synthesizing the sound pressure signal and the tone signal.