Topic: Communication Systems
By doubling the sampling frequency
- A. Quantisation noise decreases by 3 dB
- B. Quantisation noise density decreases by 3 dB
- C. Quantisation noise increases by 3dB
- D. Quantisation noise density increases by 3 dB
Answer: A. Quantisation noise decreases by 3 dB
Explanation: Quantization noise power is inversely proportional to the sampling frequency when appropriately filtered. Doubling the sampling frequency reduces the noise by a factor of 2, which corresponds to a 3 dB decrease: 10*log10(1/2) = -3 dB.