1
GATE ECE 2004
MCQ (Single Correct Answer)
+1
-0.3
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
A
8/6
B
12
C
16
D
8
2
GATE ECE 2004
MCQ (Single Correct Answer)
+1
-0.3
In the output of a DM speech encoder, the consecutive pulses are of opposite polarity during time interval t1 $$ \le $$ t $$ \le $$ t2. This indicates that during this interval
A
the input to the modulator is essentially constant.
B
the modulator is going through slope overload.
C
the accumulator is in saturation.
D
the speech signal is being sampled at the Nyquist rate.
3
GATE ECE 2004
MCQ (Single Correct Answer)
+2
-0.6
A 1 mW video signal having a bandwidth of 100 MHz is transmitted to a receiver through a cable that has 40 dB loss. If the effective one-sided noise spectral density at the receiver is 10-20 Watt/Hz, then the signal-to-noise ratio at the receiver is
A
50 dB
B
30 dB
C
40 dB
D
60 dB
4
GATE ECE 2004
MCQ (Single Correct Answer)
+2
-0.6
Three analog signals, having bandwidths 1200 Hz, 600 Hz and 600 Hz are sampled at their respective Nyquist rates, enocodes with 12 bit words, and time division multiplexed. The bit rate for the multiplexed signal is
A
115.2 kbps
B
28.8 kbps
C
57.6 kbps
D
38.4 kbps
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