Signal Transformation by Transmitter | Generated by AI
Question: In a communication system model, which part appropriately transforms the signal generated by the information source for transmission?
Answer:
A. 发送设备 (Transmitter / Sending equipment)
Correct answer: A
Explanation:
In the classic communication system model (such as the Shannon model), the main functional blocks are:
- Information source (信源): produces the original message or signal
- Transmitter / Sending equipment (发送设备): performs necessary transformations on the source signal to make it suitable for transmission over the channel. The most common transformations are:
- Source coding (to reduce redundancy and compress data)
- Channel coding (to add error protection)
- Modulation (to convert the signal into a form suitable for the physical channel, e.g., changing it to a higher frequency carrier)
- Channel (信道): the physical medium that carries the signal (wired, wireless, optical fiber, etc.)
- Receiver / Receiving equipment (接收设备): performs the reverse operations (demodulation, channel decoding, source decoding) to recover the original message
- Destination (信宿): receives the final information
- Noise source (噪声源): represents all unwanted disturbances added during transmission
Only the transmitter (发送设备) is responsible for transforming (“适当的变换”) the original signal produced by the source into a form that is appropriate and optimized for transmission through the channel.
Therefore, the correct answer is A. 发送设备.
References:
- None (standard communication theory knowledge)