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. 23, 2005
Filed:
Mar. 18, 2003
Jen-sheng Huang, Hsinchu, TW;
Yaw-guang Chang, Hsinchu, TW;
Li-cheng Hsu, Hsinchu, TW;
Jinn-ja Chang, Hsinchu, TW;
Jen-Sheng Huang, Hsinchu, TW;
Yaw-Guang Chang, Hsinchu, TW;
Li-Cheng Hsu, Hsinchu, TW;
Jinn-Ja Chang, Hsinchu, TW;
Terax Communication Technologies Inc., Hsinchu, TW;
Abstract
There is provided a signal demodulating method of a two-phase frequency shift keying (FSK) digital demodulator. The method utilizes at least a detect circuit respectively detecting and collecting a positive edge signal and a negative edge signal of an intermediate frequency signal. Then, two n-bit ripple counters are utilized to refer to a threshold value and then receiving the positive and negative edge signal as a switch signal to reset the threshold value as an initial value of counters so as to start to count and compare to output a positive edge data bit and a negative edge data bit. Last, a hard decision logic circuit is used to perform a frequency-descending decision in accordance with the positive and negative edge data bit so as to send a base frequency signal. The method can decrease the logic gate counts, shorten the signal delay time, and increase the resolution of the demodulation. The present invention allows for; easy and practical signal demodulating method results, which can match the compact trend of the wireless products.