# on 03-Jan-2024 (Wed)

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#### Annotation 7609142611212

 频率调制信号公式 The function of the Frequency Modulating signal is: $$s_{fm}(t)=A\cos(2\pi f_{i}t)$$ and the $$f_{i}$$ is the instantaneous frequency of a VCO-generated FM signal: $$f_{i}=f_{c}+k_{f}\cdot m(t)$$ where $$f_{c}$$ is the carrier frequency, $$k_{f}$$ is the VCO gain (or the frequency sensitivity factor) measured in Hz/V and $$m(t)$$ is the message signal.
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#### Flashcard 7609145494796

Question
The function of the Frequency Modulating signal is: [...]
Answer

$$s_{fm}(t)=A\cos(2\pi f_{i}t)$$

and the $$f_{i}$$ is the instantaneous frequency of a VCO-generated FM signal:

$$f_{i}=f_{c}+k_{f}\cdot m(t)$$

where $$f_{c}$$ is the carrier frequency, $$k_{f}$$ is the VCO gain (or the frequency sensitivity factor) measured in Hz/V and $$m(t)$$ is the message signal.

status measured difficulty not learned 37% [default] 0

The function of the Frequency Modulating signal is: $$s_{fm}(t)=A\cos(2\pi f_{i}t)$$ and the $$f_{i}$$ is the instantaneous frequency of a VCO-generated FM signal: $$f_{i}=f_{c}+k_{f}\cdot m(t)$$ where $$f_{c}$$ is the carrier frequency, $$k_{f}$$ is the VCO gain (or the frequency sensitivity factor) measured in Hz/V and $$m(t)$$ is the message signal.

#### Annotation 7609147854092

 频率调制信号的最大偏移比率 The deviation ratio is given by: $$R_{d} = \frac{f_{d}}{B_{m}}=\frac{k_{f}|m(t)|_{\max}}{B_{m}}$$ where $$B_{m}$$ is the bandwidth of the message $$m(t)$$.
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#### Flashcard 7609149689100

Question
The deviation ratio of FM is given by: [...]
Answer

$$R_{d} = \frac{f_{d}}{B_{m}}=\frac{k_{f}|m(t)|_{\max}}{B_{m}}$$

where $$B_{m}$$ is the bandwidth of the message $$m(t)$$.

status measured difficulty not learned 37% [default] 0

The deviation ratio is given by: $$R_{d} = \frac{f_{d}}{B_{m}}=\frac{k_{f}|m(t)|_{\max}}{B_{m}}$$ where $$B_{m}$$ is the bandwidth of the message $$m(t)$$.

#### Annotation 7609152048396

 频率调制信号的大致带宽公式 The approximate bandwidth of FM signal is: $$B_{FM} = 2B_{m}(1 + R_{d})= 2(B_{m} + f_{d})$$. (乘以2是因为频率调制信号一般包含了上下两个侧边带)
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#### Flashcard 7609153883404

Question

The approximate bandwidth of FM signal is: [...]

Answer
$$B_{FM} = 2B_{m}(1 + R_{d})= 2(B_{m} + f_{d})$$. (乘以2是因为频率调制信号一般包含了上下两个侧边带)

status measured difficulty not learned 37% [default] 0

The approximate bandwidth of FM signal is: $$B_{FM} = 2B_{m}(1 + R_{d})= 2(B_{m} + f_{d})$$. (乘以2是因为频率调制信号一般包含了上下两个侧边带)

#### Annotation 7609156766988

 相位锁定环描述 相位锁定环描述：相位锁定环是一种通信技术，输入一个之前经过幅度调制的接收信号，输出一个频率相同的正弦振荡信号。其原理根本上来说就是通过不断减小接收信号和本地振荡器信号之间的相位差，使得本地振荡器信号的频率不断逼近接收信号的频率.
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#### Flashcard 7609158601996

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Answer

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#### Flashcard 7609160699148

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