Encoding of signal is required for

Options

A. modulation at transmitting end
B. modulation at receiving end
C. demodulation at receiving end
D. demodulation at transmitting end

Explanation

To solve the question "Encoding of signal is required for", we need to understand the concept of modulation and its role in communication systems. Here is the step-by-step solution:

### Step 1: Understand the Concept of Modulation
Modulation is the process of varying one or more properties of a carrier wave (such as its amplitude, frequency, or phase) in accordance with the information signal that is to be transmitted. This is essential for effective communication over long distances.

**Hint:** Think about why we need to change the properties of a wave for transmission.

### Step 2: Identify the Purpose of Encoding
Encoding a signal is primarily done to prepare it for transmission. This involves converting the original message signal into a form that can be effectively transmitted over a communication channel.

**Hint:** Consider what happens to signals when they travel over distances.

### Step 3: Recognize the Challenges in Transmission
During transmission, signals can face challenges such as attenuation (loss of signal strength) and noise (unwanted signals that interfere with the original message). Encoding helps to mitigate these issues.

**Hint:** Reflect on the factors that can distort a signal during transmission.

### Step 4: Determine Where Encoding Occurs
Encoding of a signal is required at the transmitting end to modulate the signal before it is sent to the receiver. This ensures that the signal is in a suitable form for transmission over the communication medium.

**Hint:** Think about where the signal is first altered for transmission.

### Step 5: Conclusion
Based on the understanding of modulation and the role of encoding, the correct answer to the question is that encoding of a signal is required for **modulation at the transmitting end**.

**Final Answer:** Encoding of a signal is required for modulation at the transmitting end.