Topic: Communication Systems
Output SNR of a 10 bit PCM was found to be 30 dB, desired SNR is 42 dB. To achieve desired SNR by increasing the number of quantization levels, then new levels will be
- A. 256
- B. 512
- C. 2018
- D. 1024
Explanation: The SNR for PCM is roughly given by $SNR_{PCM} = K + 6n \text{ dB}$. To increase the SNR from 30 dB to 42 dB (an increase of 12 dB), the number of bits (n) must be increased by 2. The original was 10 bits, so the new number of bits is 12. The number of quantization levels would be $2^{12} = 4096$. None of the given options match this answer.