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:
Jun. 04, 1996
Filed:
Jan. 03, 1995
Masanobu Kawamura, Kodaira, JP;
Hiroyuki Kida, Kokubunji, JP;
Seiji Kamada, Hitachi, JP;
Toshiyuki Tojo, Higashimurayama, JP;
Takeshi Ohkubo, Oomiya, JP;
Hiroyuki Matsuura, Sugito-machi, JP;
Naoki Yashiki, Kodaira, JP;
Nobuo Shibasaki, Kodaira, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A variable wave forming circuit is provided which produces signals of various waveforms (e.g., sine, triangular or trapezoidal waves) and various frequencies. A random access memory (memory means) 121 to store wave formation information on waveform is provided. According to the wave formation information stored in the memory means, the updating or keeping of a digital value in an increment/decrement circuit 123 is controlled and the digital value is digital/analog-converted by a digital/analog (D/A) conversion circuit 124, which is controlled by a digital value control means that includes the increment/decrement circuit 123. By writing appropriate wave formation information into the memory means, it is possible to produce signals of desired waveforms.