发明名称 |
Signal demodulating method of a two-phase frequency shift keying (FSK) digital demodulator |
摘要 |
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.
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申请公布号 |
US6933776(B2) |
申请公布日期 |
2005.08.23 |
申请号 |
US20030390002 |
申请日期 |
2003.03.18 |
申请人 |
TERAX COMMUNICATION TECHNOLOGIES INC. |
发明人 |
HUANG JEN-SHENG;CHANG YAW-GUANG;HSU LI-CHENG;CHANG JINN-JA |
分类号 |
H04L27/156;(IPC1-7):H03D3/00 |
主分类号 |
H04L27/156 |
代理机构 |
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地址 |
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