Question 81 : The signals which are obtained by encoding each quantized signal into a digital word is called as
1. PAM signal
2. PCM signal
3. FM signal
4. Sampling and quantization
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Question 82 : Which method should be implemented for reducing bandwidth?
1. Multilevel codes
2. Multilevel signalling
3. PAM
4. PDM
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Question 83 : Timing jitter can be reduced by
1. Good power supply isolation
2. Stable clock reference
3. Good power supply isolation & Stable clock reference
4. None of the mentioned
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Question 84 : In polybinary signalling method the present bit of binary sequence is algebraically added with ______ number of previous bits.
1. j
2. 2j
3. j+2
4. j-2
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Question 85 : Companding is the process of
1. Compression
2. Expansion
3. Compression & Expansion
4. None of the mentioned
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Question 86 : From digital filter we will get the output pulse as the _______ of the current and the previous pulse.
1. Summation
2. Difference
3. Product
4. Ratio
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Question 87 : In precoding technique, the binary sequence is _____ with the previous precoded bit.
1. And-ed
2. Or-ed
3. EXOR-ed
4. Added
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Question 88 : Sample resolution for LPCM ____ bits per sample.
1. 8
2. 16
3. 24
4. All of the mentioned
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Question 89 : For both PPM and PDM _______ is kept constant.
1. Amplitude
2. Time period
3. Frequency
4. Number of levels
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Question 90 : Which binary waveform uses three levels?
1. Bipolar RZ
2. RZ-AMI
3. Bipolar RZ & RZ-AMI
4. None of the mentioned
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