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For an efficient communication in PCM system number of samples per second must at least be equal to twice the highest modulating frequency. Comment? O a. None of the mentioned O b. Not necessary O c. A very important consideration O d. Depend on signals
Companding is used? a. To overcome quantization noise in PCM O b. To protect small signals in PCM from quantizing distortion In PCM transmitters, to allow amplitude limiting in the receiver O d. In PCM receivers, to overcome impulse noise Ос.
---Is the most affected by noise? O a. FSK O b. ASK Ос. BPSK O d. PSK
The aperture effect in flat top pulses is reduced by using O a. Compander O b. Equalizer O c. Integrator O d. Predictor OC
A TDM link has 20 signal channels and each channel is sampled 8000 times/sec. Each sample is represented by 7 binary bits and contains an additional bit for synchronization. The total bit rate for TDM link is? O a. 180 kbps O b. 1180mbps 1280 kbps O d. 1880 mbps O c.
In delta modulation depending upon the of error, the sign of step size will be decided? оа. None of the given O b. quality O c. sign O d. type
For orthonormality it is very important that, if i=j then the value of i=j must be equal to? оа. constant O b. one O c. infinity O c O d. zero
The hamming distance between the given two code words 100101110 and 110101101 is? O a. 1 O b. 3 O c. 4 O d. 2
A sampling rate 2000 samples /second means that discrete points are acquired per second? O a. 8000 Ob. 2000 Ос. 1000 O d. 4000