发明名称 |
Quadrature demodulator and interrogator |
摘要 |
A quadrature demodulator generates an I-signal from a modulated reception signal and a local signal, generates a Q-signal from the local signal and the local signal having a phase shifted through 90 degrees. Capacitors remove DC components from the I- and Q-signals. Low-pass filters remove frequency components higher than the frequencies of the I- and Q-signals. An I-signal squaring section squares the I-signal having passed through the low-pass filters. A Q-signal squaring section squares the Q-signal having passed through the low-pass filters. An adding section adds the squared I-signal and the squared Q-signal together. A comparator then compares the level of an S 1 signal resulting from the addition with a threshold to obtain an S 2 signal. A data generating section of a digital signal processing section executes a process of inverting the signal level of the S 2 signal at every rising edge of the S 2 signal to demodulate reception data.
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申请公布号 |
US2008266059(A1) |
申请公布日期 |
2008.10.30 |
申请号 |
US20080215209 |
申请日期 |
2008.06.25 |
申请人 |
TOSHIBA TEC KABUSHIKI KAISHA |
发明人 |
MUROFUSHI NOBUO;OISHI SADATOSHI |
分类号 |
H04Q5/22 |
主分类号 |
H04Q5/22 |
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