請教一下 FM 及 AM 的問題

[老音學生]

可否請教一下 FM 及 AM 的問題

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?

我不是學 電機 電子 物理 或 類似這些的,故搞不懂
請 不吝指導提示幫忙
謝謝 ^_^

-- 老音學生 --

[老音學生]

先自問自答 1]
還不知是否正確... 請 指教

1]
1800, 2000 2200; 2800, 3000, 3200; 4800, 5000, 5200; 7200, 7400, 7600.
是這樣對嗎?

2] 呢?

===

Post by 老音學生
可否請教一下 FM 及 AM 的問題
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?
我不是學 電機 電子 物理 或 類似這些的,故搞不懂
請 不吝指導提示幫忙
謝謝 ^_^
-- 老音學生 --

[老音學生]

唉~ 還是得自問自答...

2]

Post by 老音學生

Post by 老音學生
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

是這樣吧 ^_^

Post by 老音學生

Post by 老音學生
-- 老音學生 --

===

Post by 老音學生
先自問自答 1]
還不知是否正確... 請 指教
1]
1800, 2000 2200; 2800, 3000, 3200; 4800, 5000, 5200; 7200, 7400, 7600.
是這樣對嗎?
2] 呢?
===

Post by 老音學生
可否請教一下 FM 及 AM 的問題
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?
我不是學 電機 電子 物理 或 類似這些的,故搞不懂
請 不吝指導提示幫忙
謝謝 ^_^
-- 老音學生 --