Digital Communication - Study Mode
[#166] In asynchronous TDM, for n signal sources, each frame contains m slots, where m is usually
Correct Answer
(A) less than n
[#167] In a PCM system, if the code word length is increases form 6 to 8 bits, the signal to quantization noise ratio improves by the factor
Correct Answer
(C) 16
[#168] A source emits bit 0 with probability $$frac{1}{3}$$ and bit 1 with probability $$frac{2}{3}.$$xa0The emitted bits are communicated to the receiver. The receiver decides for either 0 or 1 based on the received value R. It is given that the conditional density functions of R as [x08egin{array}{l}
{f_{R/0}}left( r
ight) = left{ {x08egin{array}{*{20}{c}}
{frac{1}{4},}&{ - 3 le r le 1}\
{0,}&{{
m{otherwise}}}
end{array}}
ight.,{
m{and}}\
{f_{R/1}}left( r
ight) = left{ {x08egin{array}{*{20}{c}}
{frac{1}{6},}&{ - 1 le r le 5}\
{0,}&{{
m{otherwise}}}
end{array}}
ight.
end{array}] The minimum decision error probability is
Correct Answer
(D) $$frac{1}{6}$$
[#169] Discrete samples of an analog signal are uniformly quantized to PCM. If the maximum value of analog sample is to be represented within 0.1% accuracy, then the minimum number of binary digits required per sample is
Correct Answer
(C) 10
[#170] A signal m 1 (t) is band limited to 3.6 kHz and the three other signals m 2 (t), m 3 (t) and m 4 (t) are band limited to 1.2 kHz each, and these signals are transmitted by means of TDM. Then, what will be the transmission bandwidth of the channel.
Correct Answer
(A) 7.2 kHz