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:
Jan. 05, 1988
Filed:
Dec. 21, 1984
Kenichi Tsutsumi, Tachikawa, JP;
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
A device for computing interpolated values of a waveform generated in an electronic device, includes a memory for storing waveform data of a periodic sinusoidal wave, and an address signal generator for generating an address signal. The waveform data consists of sine wave data and cosine wave data. An address signal from the generator or a signal obtained by inverting the address signal (i.e., inverted address signal) is supplied to the memory. Upon receipt of the address signal, the memory reads out the sine wave data or the cosine wave data. Upon receipt of the inverted address signal, it reads out the remaining wave data. The wave data read from the memory is multiplied by a multiplier, which produced an interpolated value. An adder adds this value to the sine or consine wave data read out from the memory when the inverted address signal is supplied to the memory, and computes amplitude value data corresponding to the address signal.