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. 11, 2006
Filed:
Feb. 11, 2004
David Shiung, Tainan, TW;
David Shiung, Tainan, TW;
Novatek Microelectronics Corp., Hsinchu, TW;
Abstract
A non-coherent frequency shift key demodulator comprising an oversampling device, a chain of registers, and a threshold device is disclosed. The oversampling device receives an input digital non-coherent frequency shift signal, and examines for transitions therein, and thereby generating data bit signals in the form of logic high level '1' or logic low level '0' accordingly. The chain of registers receives, counts and stores the number of 1's data bit signals. Following, the threshold device compares the stored number of 1's in the chain of registers with a predetermined threshold value to extract the digital signal of the input digital non-coherent frequency shift signal. The non-coherent frequency shift key demodulator, by the use of a simple circuit and implementation, combats miscellaneous system impairments, such as frequency offset, and further support multi-rate transmission.