PULSE CODE MODULATION

In PCM encoding, quantization level varies as a function of ________

• Frequency

• Amplitude

• Square of frequency

• Square of amplitude

The sequence of operations in which PCM is done is

• Quantization , encoding , Sampling

• encoding ,Quantization , Sampling

• Sampling, encoding ,Quantization ,

• Sampling, Quantization , encoding

One of the disadvantages of PCM is

• large bandwidth

• Very high noise

• cannot be decoded

• All the above

The error probability of a PCM is

• Calculated using noise and inter symbol interference

• Gaussian noise + error component due to inter symbol interference

• Calculated using power spectral density

• All of the above

Quantization noise can be reduced by ________ the number of levels

• Decreasing

• increasing

• doubling

• reduced to half

In uniform quantization process

• The step size remains same

• Step size varies according to the values of the input signal

• The quantizer has linear characteristics

• Both a and c are correct

Source coding reduces

• Redundancy

• Average bit rate

• Redundancy & Average bit rate

• None of the mentioned

Which device is needed for the reconstruction of signal?

• Low pass filter

• Equalizer

• Low pass filter and Equalizer

• High pass filter and equalizer

The process of approximating the continuous set of values with a finite set of values is called _________ .

• Modulation

• Quantization

• Sampling

• Approximation

Quantization noise ____________ the SNR of a signal.

• reduces

• increases