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:
Mar. 26, 1991
Filed:
Oct. 22, 1987
Akira Yazawa, Tokyo, JP;
Kenji Nakayama, Tokyo, JP;
NEC Corporation, , JP;
Abstract
An FM modulator comprises a first adder for adding an impulse input signal and a feedback signal to produce an added signal, a delay device for receiving and delaying the added signal to produce first and second delayed signals, a multiplying coefficient generator for producing multiplying coefficients, multiplier for multiplying the delayed signals by multiplying coefficients to produce first and second multiplied signals, and a second adder for adding the multiplied signals to produce the feedback signal. The added signal is a frequency modulation signal which may be further delayed and multiplied by multiplying coefficients. At lease one of the multiplying coefficients varies in its value as a function of time so that the frequency modulation signal is produced.