Signal demodulating method of a two-phase frequency shift...

Details Signal demodulating method of a two-phase frequency shift... Signal demodulating method of a two-phase frequency shift...

2005-08-23

2005-08-23

Kinkead, Arnold (Department: 2817)

Demodulators

Frequency shift keying or minimum shift keying demodulator

C329S303000, C375S334000, C375S335000

Reexamination Certificate

active

06933776

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.

REFERENCES:
patent: 4707666 (1987-11-01), Pfeifer et al.

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