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, 2002
Filed:
Dec. 11, 1998
Hitonobu Furukawa, Osaka, JP;
Masami Takigawa, Osaka, JP;
Akira Mishima, Gifu, JP;
Hiroaki Ozeki, Osaka, JP;
Sachiko Hayashi, Osaka, JP;
Abstract
The invention presents an apparatus capable of demodulating stably if there are time-course changes in the constituent parts in a demodulator of digital modulated signal. This demodulator comprises an operator for setting the oscillation frequency of a local oscillator , and within a passing frequency band of a band pass filter BPF , the operator controls the local oscillator so that the frequency of the output signal of a first mixer may settle within a control band in a controllable frequency band of an AFC feedback loop composed of an orthogonal detector , a carrier regenerator 9, a frequency error detector , a frequency controller , a signal selector , a D/A converter , and a VCO , and a local carrier is issued from the local oscillator to the first mixer