发明名称 |
FM demodulator for SECAM decoder |
摘要 |
A SECAM decoder and an FM modulator therefor are disclosed, in which a demodulated color signal is provided to indicate deviations in the frequency of modulated color information from a nominal subcarrier frequency. The demodulator comprises numerator and denominator filters operating on the modulated color information, and a divider providing a ratio result by dividing the numerator filter output by the denominator filter output. The demodulator may include two sets of numerator and denominator filters offset in phase from one another, where one of the two sets is selectively employed in order to mitigate divide-by-zero problems. Also disclosed are methods for demodulating digitized FM color signals in a SECAM decoder.
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申请公布号 |
US6943847(B2) |
申请公布日期 |
2005.09.13 |
申请号 |
US20020229717 |
申请日期 |
2002.08.28 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
RENNER KARL;DEMMER WALTER |
分类号 |
H04N9/66;H04N11/18;(IPC1-7):H04N9/66;H04N5/455 |
主分类号 |
H04N9/66 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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