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:
Apr. 27, 2010
Filed:
Mar. 14, 2005
Shunsuke Hirano, Yokohama, JP;
Mamoru Arayashiki, Yokohama, JP;
Shunsuke Hirano, Yokohama, JP;
Mamoru Arayashiki, Yokohama, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A two-point frequency modulation apparatus is proposed whereby the spectrum of transmission waves is kept within the spectrum mask. Voltage is supplied to the control voltage terminal of VCOin accordance with modulation data via noise shaperthat has operating characteristics of attenuating more noise at higher frequencies. As a result, by virtue of the working of noise shaper, the signal level outputted from the PLL circuit combining the modulation signal and the quantization noise decreases in proportion to the distance form the central frequency, so that two-point frequency modulation apparatusis made possible whereby the spectrum of an RF modulation signal is kept within the spectrum mask.