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:
Jun. 02, 2009
Filed:
Aug. 08, 2007
Xu Changqing, Singapore, SG;
LI Zhiping, Singapore, SG;
HU Saigui, Singapore, SG;
Tan Kai Ren, Singapore, SG;
Wang Tingwu, Singapore, SG;
Tomisawa Masayuki, Singapore, SG;
Xu Changqing, Singapore, SG;
Li Zhiping, Singapore, SG;
Hu Saigui, Singapore, SG;
Tan Kai Ren, Singapore, SG;
Wang Tingwu, Singapore, SG;
Tomisawa Masayuki, Singapore, SG;
Oki Techno Centre (Singapore) Pte Ltd, Singapore, SG;
Abstract
An apparatus for demodulating a modulated signal comprises an analog to digital converter () for converting an analog modulated input signal to a digital signal. The analog to digital converter is arranged to sample the input signal at a predetermined sampling rate. A digital down converter () then receives the digital signal at the sampling rate. The digital down converter has an associated digital intermediate frequency and reduces the frequency of the digital signal to one quarter of the sampling rate. A low pass filter () filters selected frequencies from the digital signal. A frequency offset stage () applies a modification to the frequency of the filtered signal to reduce frequency offset therein, and a differential demodulator () demodulates the signal after modifying the frequency to reduce the frequency offset. There is also disclosed a method for demodulating a signal.