Electronics and Communication Engineering - Communication Systems - Discussion
Discussion Forum : Communication Systems - Section 5 (Q.No. 24)
24.
In a PCM system, if the code word length is increased from 6 to 8 bits, the signal to quantization noise ratio improves by the factor.
Answer: Option
Explanation:
Given n1 = 6, n2 = 8,
then (SNR)Q = 22(n2 - n1) 
16.
Discussion:
10 comments Page 1 of 1.
Preeti said:
1 decade ago
How 16? Do calculations again?
Shadab Akhtar said:
9 years ago
The answer should be 12.
SNR = (1.7 + 6n)
SNR1 = (1.7 + 6*8)
=> 49.7
SNR2 = ( 1.7 + 6*6)
=> 37.7
SNR2 - SNR1 = 49.7 - 37.7 = 12
SNR = (1.7 + 6n)
SNR1 = (1.7 + 6*8)
=> 49.7
SNR2 = ( 1.7 + 6*6)
=> 37.7
SNR2 - SNR1 = 49.7 - 37.7 = 12
SHailesh said:
9 years ago
Are you sure @Shadab Akhtar.
Thanks. It's Good Method it is right!
Thanks. It's Good Method it is right!
Shailesh Patel said:
9 years ago
Theoretical SNR is 36dB for a 6-bit sample depth.
Simply add or subtract 6dB for each bit difference.
Here for 8 bit 48db and 36db for 6 bit.
Now, 48db - 36db =12.
So 12 is the right answer.
Simply add or subtract 6dB for each bit difference.
Here for 8 bit 48db and 36db for 6 bit.
Now, 48db - 36db =12.
So 12 is the right answer.
Jyotirmay nath said:
9 years ago
How 16? I didn't get it, please help me.
Pratik said:
8 years ago
16 is right.
(3/2 * 2^2n1)/(3/2*2^2n2).
now you get 2^16/2^12.
2^4= 16 ans.
(3/2 * 2^2n1)/(3/2*2^2n2).
now you get 2^16/2^12.
2^4= 16 ans.
Shadan said:
8 years ago
S/N = 2^2n= 2^12.
S/N =2^2n= 2^16.
So,
= 2^16/2^12.
=2^4 = 16.
S/N =2^2n= 2^16.
So,
= 2^16/2^12.
=2^4 = 16.
(1)
#JustAsking said:
7 years ago
@Shadan.
Your computation is in dB? Because it seems like just a normal ratio and it doesn't even represent a quantization error as what is being asked in the problem.
Your computation is in dB? Because it seems like just a normal ratio and it doesn't even represent a quantization error as what is being asked in the problem.
Zulu Chungtia said:
6 years ago
Correct @Shadab.
Because the question isn't asked in dB.
Because the question isn't asked in dB.
Chandni said:
4 years ago
Agree, 16 is the correct answer.
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