Topic: Communication Systems
For a 10 bit PCM system the signal to quantisation noise ratio is 62 dB. If the number of bits is increased by 2, then the signal to quantisation noise ratio will
- A. Increase by 6 dB
- B. Increase by 12 dB
- C. Decrease by 6 dB
- D. Decrease by 12 dB
Answer: B. Increase by 12 dB
Explanation: $SN_{q}R=1.8+6n$. Increasing $n$ by 2 will increase the signal to quantization noise ratio by $6 \times 2 = 12~dB$.