唉~ 还是得自问自答... 2] >> A single tone of 2500 Hz (the carrier) is frequency modulated by a sine >> tone (the modulator) of 140 Hz. >> Assume that three sideband pairs will be created. >> What will be the frequencies of the resulting spectrum? 2080, 2220, 2360 2500, 2640, 2780, 2920 是这样吧 ^_^ >> -- 老音学生 -- === "老音学生" <[email protected]> 撰写於邮件新闻:FI3Lh.32584$zU1.27808@pd7urf1no... > 先自问自答 1] > 还不知是否正确... 请 指教 > > 1] > 1800, 2000 2200; 2800, 3000, 3200; 4800, 5000, 5200; 7200, 7400, 7600. > 是这样对吗? > > 2] 呢? > > === > > "老音学生" <[email protected]> 撰写於邮件新闻:UDrKh.24448$DN.8648@pd7urf2no... >> 可否请教一下 FM 及 AM 的问题 >> >> 1] >> A complex waveform (the carrier) with a fundamental frequency of 2k Hz is >> amplitude modulated by a sine tone with frequency of 200 Hz, (the >> modulator). >> Because the carrier is a complex waveform, a sideband pair will be formed >> around each of its original partials. >> If the partials of the carrier waveform are 2000, 3000, 5000, and 7400 >> Hz, what will be the frequencies of the resulting spectrum? >> Remember to include the frequencies of the carrier waveform in your >> answer. >> >> 2] >> A single tone of 2500 Hz (the carrier) is frequency modulated by a sine >> tone (the modulator) of 140 Hz. >> Assume that three sideband pairs will be created. >> What will be the frequencies of the resulting spectrum? >> >> 我不是学 电机 电子 物理 或 类似这些的,故搞不懂 >> 请 不吝指导提示帮忙 >> 谢谢 ^_^ >> >> -- 老音学生 --