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:
Aug. 03, 2010
Filed:
Mar. 22, 2006
Masashi Sato, Kawasaki, JP;
Yutaka Awata, Kawasaki, JP;
Masashi Sato, Kawasaki, JP;
Yutaka Awata, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A timing recovery circuit capable of enhancing the reliability of timing recovery in a receiver apparatus in a communication system that employs the scheme of modulating the amplitude of a carrier wave. In the receiver apparatus which receives a transmitted signal created by modulating the amplitude of the carrier wave, and which comprises an AD converter for converting the received signal into a digital signal by sampling the received signal at an n-times oversampling rate, the timing recovery circuit which recovers a clock signal by extracting timing information from the output of the AD converter is constructed by containing therein a decimation filter for decimating the output of the AD converter down to an m-times oversampling rate (where 1<m<n), a phase difference information calculator for calculating the phase difference information from the output of the decimation filter; a loop filter for averaging the output of the phase difference information calculator, and an oscillator for generating, based on the output of the loop filter, a clock signal for controlling the sampling performed by the AD converter.