Step response of the system is defined as
1. The output due to a unit step input signal
2. The running sum of impulse response
3. The running integral of impulse response for a continuous time system
The process of assigning to each one of the sample values of the message signal, a discrete value from a prescribed set of a fiite number of such discrete values is called.
A telephone signal band limited to 4 kHz is to be transmitted by PCM. If the signal to quantization noise is to be at leasst of 40 dB, the number of levels into which the signal is to be encoded will be