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:
Sep. 16, 1986
Filed:
Apr. 05, 1985
Suzuki Hideo, Hamamatsu, JP;
Nippon Gakki Seizo Kabushiki Kaisha, Hammatsu, JP;
Abstract
A tone wave synthesizing apparatus comprises a phase address generator; a time frame generator; an elementary wave generator; an incremental wave generator; and an adder. The phase address generator generates a phase address signal which designates phase addresses for phase angles of a waveform to be produced progressively and repetitively. The time frame generator generates a time frame signal which sequentially designates a series of time frames one after another. The elementary wave generator repeatedly generates, for each designated time frame, a period of elementary tone wave in the form of a series of wave sample values in accordance with the phase address signal, which elementary tone wave represents a tone wave at a beginning of the designated time frame. The incremental wave generator generates progressively changing incremental waves each in the form of a series of wave sample values in accordance with the phase address signal, which progressively changing incremental waves exhibit successive changes of waveform from one period to another by an amount predetermined for the designated time frame. The adder adds, in each time frame of the successive time frames, the elementary tone wave and the progressively changing incremental waves from one period to another. Thus a tone wave which changes its form with the lapse of time is synthesized by means of a small sized waveform generators.