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. 02, 2004
Filed:
Aug. 15, 2000
Hisakazu Katoh, Tokyo, JP;
Akinori Hashimoto, Tokyo, JP;
Tomohiro Saito, Tokyo, JP;
Fumiaki Minematsu, Tokyo, JP;
Kenichi Shiraishi, Yokohama, JP;
Akihiro Horii, Zama, JP;
Shoji Matsuda, Machida, JP;
Soichi Shinjo, Machida, JP;
Kabushiki Kaisha Kenwood, Tokyo, JP;
Abstract
A carrier reproduction circuit which can perform stable carrier reproduction even when reception takes place with low C/N values is provided. The reception phase of the demodulated known-pattern reception signal is detected with a frame synchronizing timing circuit ( ), and based on the detected reception phase, either the phase difference table of absolute phase having one convergence point or the phase difference table of the phase rotated from the absolute phase by 180°, which are included in a carrier reproduction phase difference detecting circuit ( ), is selected, and from the selected phase difference table the output based on the phase difference between the phase obtained from the signal point position of the reception signal and the phase convergence point is obtained, and thus carrier reproduction is implemented by undergoing the reproduced carrier frequency control via an AFC circuit ( ) so that the phase obtained from the signal point position coincides with the phase convergence point.