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Which of the following statements are true in the case of Pulse Code Modulation (PCM)? a) If the number of bits per sample is increased from n to n + 1; the S/Nq the ratio would be 6 dB b) The quantization noise depends on the sampling rate c) The main advantage of PCM is that it possesses better performance in the presence of noise d) If the number of quantization levels increases from 4 to 64, the bandwidth increase by a factor of 4
Companding is used in PCM transmitters to overcome quantizing noise in PCM.
A speech signal has a total duration of 20 sec. It is sampled at the rate of 8 kHz and then PCM encoded. The signal-to-quantization noise ratio is required to be 40 dB. The minimum storage capacity needed to accommodate this signal is
A sinusoidal massage signal m(t) is transmitted by binary PCM without compression. If the signal to-quantization-noise ratio is required to be at least 48 dB, the minimum number of bits per sample will be
A signal having uniformly distributed amplitude in the interval (-V to + V), is to be encoded using PCM with uniform quantization. The signal to quantizing noise ratio is determined by the
In a PCM system with uniform quantization, increasing the number of bits from 8 to 9 will reduce the quantization noise power by a factor of
Which of the following are the basic differences between vibration signature and noise signature? 1. Vibration signature is essentially in the frequency range zero to 100 cps whereas noise signature is in the range 20 cps to 3000 cps. 2. Vibration signature has well-defined peaks whereas the noise signal is smeared. 3. The intensities of noise signatures arc much less than that of vibration signatures. 4. Detection of vibration signature calls for a microphone whereas that of noise can do with a pickup. Select the correct answer using the code given below.
Assuming that the signal is quantized to satisfy the condition of previous question and assuming the approximate bandwidth of the signal is W. The minimum required bandwidth for transmission of a binary PCM signal based on this quantization scheme will be
Signal to quantization noise ratio in PCM system depends on _________
Signal to quantization noise ratio of a PCM encoder is given by _________