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:
May. 28, 1991
Filed:
Apr. 10, 1989
Shigeru Uchiyama, Sayama, JP;
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
An input waveform signal is first converted into a compressed waveform signal by log-conversion. The compressed waveform signal is then converted into a digital compressed waveform signal so that a pitch of the input waveform signal is extracted from the digital compressed waveform signal. Note-on/off states of a musical tone to be produced are controlled in accordance with the level of the digital compressed waveform signal and a predetermined threshold. The attenuation period of the input waveform signal and, thus, the note-on time, can therefore be prolonged to correspond more closely with the actual playing of an instrument from which the input waveform signal is obtained.