Which of these functions is performed by software in a software-defined radio (SDR)?
The correct answer is D: All these choices are correct. Functions performed by software in a software-defined radio (SDR) include: filtering, detection, and modulation. All three are performed by software in SDRs. For amateur radio operators, this explains SDR flexibility. Understanding this helps when using SDR equipment.
Exam Tip
All three are SDR software functions: filtering, detection, modulation. When all listed functions are performed by software in SDRs, 'all of the above' is usually the answer. All demonstrate SDR flexibility.
Memory Aid
"All three are SDR software functions: Filtering, Detection, Modulation. Think 'A'll 'S'DR 'F'unctions. All three functions that were traditionally hardware are now software in SDRs. Demonstrates SDR flexibility."
Real-World Application
SDR software performs: (1) Filtering - digital filters implemented in software, (2) Detection - demodulation algorithms in software, (3) Modulation - signal generation algorithms in software. All three functions that were traditionally hardware are now software in SDRs. This is the power of SDR - software replaces hardware.
Key Concepts
Why Other Options Are Wrong
Option A: While correct, this is incomplete. Detection and modulation are also performed by software.
Option B: While correct, this is incomplete. Filtering and modulation are also performed by software.
Option C: While correct, this is incomplete. Filtering and detection are also performed by software.
题目解析
The correct answer is D: All these choices are correct. Functions performed by software in a software-defined radio (SDR) include: filtering, detection, and modulation. All three are performed by software in SDRs. For amateur radio operators, this explains SDR flexibility. Understanding this helps when using SDR equipment.
考试技巧
All three are SDR software functions: filtering, detection, modulation. When all listed functions are performed by software in SDRs, 'all of the above' is usually the answer. All demonstrate SDR flexibility.
记忆口诀
All three are SDR software functions: Filtering, Detection, Modulation. Think 'A'll 'S'DR 'F'unctions. All three functions that were traditionally hardware are now software in SDRs. Demonstrates SDR flexibility.
实际应用示例
SDR software performs: (1) Filtering - digital filters implemented in software, (2) Detection - demodulation algorithms in software, (3) Modulation - signal generation algorithms in software. All three functions that were traditionally hardware are now software in SDRs. This is the power of SDR - software replaces hardware.
错误选项分析
Option A: While correct, this is incomplete. Detection and modulation are also performed by software. Option B: While correct, this is incomplete. Filtering and modulation are also performed by software. Option C: While correct, this is incomplete. Filtering and detection are also performed by software.
知识点
Software-defined radio, SDR, Filtering, Detection, Modulation
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.