Sources:

  1. B. P. Lathi & Roger Green. (2021). Chapter 4: Continuous-Time Analysis: The Fourier Transform. Signal Processing and Linear Systems (2nd ed., pp. 401-414). Oxford University Press.

Recall that in amplitude-modulated signals, the information content of the baseband (message) signal \(m(t)\) appears in the amplitude variations of the carrier. In angle modulation discussed in this article, the information content of \(m(t)\) is carried by the angle (which includes its frequency and phase) variations of the carrier.

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Sources:

  1. B. P. Lathi & Roger Green. (2018). Chapter 7: Continuous-Time Analysis: The Fourier Transform. Signal Processing and Linear Systems (3rd ed., pp. 736-749). Oxford University Press.

Modulation causes a spectral shift in a signal, enhacing long distance transmission. Broadly speaking, there are two classes of modulation: amplitude (linear) modulation and angle (nonlinear) modulation.

In this section, we shall discuss some practical forms of amplitude modulation, including:

  1. Double-Sideband, Suppressed-Carrier (DSB-SC) modulation. It is simple and is great for illustrate the idea of amplitude modulation.
  2. Amplitude Modulation (AM). It's more efficient than DSB-SC, whereas one more condition must be satisfied. Techinically speaking, all 3 methods in this article belong to amplitude modulation. But it is this specific method which people call amplitude modulation (AM).
  3. Single-Sideband, Suppressed-Carrier (DSB-SC) modulation. It is a simpler form of (DSB-SC) modulation where only one sideband is transmitted.

The term Suppressed-Carrier (SC) comes from the fact that, both DSB and SSB signals only contain the modulated signal, excluding the carrrier signal, maing the carrier being "suppressed".

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【五代】 鹿虔扆

金锁重门荒苑静,绮窗愁对秋空。翠华一去寂无踪。玉楼歌吹,声断已随风。

烟月不知人事改,夜阑还照深宫。藕花相向野塘中,暗伤亡国,清露泣香红。

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Source:

  1. Papers:
    1. RSSM
    2. DreamerV1
    3. DreamerV2
    4. DreamerV3
  2. Blogs:
    1. EclecticSheep: Dreamer V1
    2. EclecticSheep: Dreamer V2
    3. EclecticSheep: Dreamer V3
    4. EclecticSheep: a2c algorithm
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秦观

天涯旧恨,独自凄凉人不问。欲见回肠,断尽金炉小篆香。

黛蛾长敛,任是东风吹不展。困倚危楼,过尽飞鸿字字愁。

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