KKW_ELTX_DCOM

                                                                                                                                           Name of Experiment :-Experimental Study of Basicline codes and Multilevel line codes. A  line code  is the code used for data transmission of a digital signal over a transmission line. This process of coding is chosen so as to avoid overlap and distortion of signal such as inter-symbol interference. Properties of Line Coding Following are the properties of line coding − As the coding is done to make more bits transmit on a single signal, the bandwidth used is much reduced. For a given bandwidth, the power is efficiently used. The probability of error is much reduced. Error detection is done and the bipolar too has a correction capability. Power density is much favorable. The timing content is adequate. Long strings of  1s  and  0s  is avoided to maintain transparency.               PRE TEST                                                           

                                                                                          Name of Experiment :- Experimental study of Delta Modulation and signal reconstruction The sampling rate of a signal should be higher than the Nyquist rate, to achieve better sampling. If this sampling interval in Differential PCM is reduced considerably, the sampleto-sample amplitude difference is very small, as if the difference is  1-bit quantization , then the step-size will be very small i.e.,  Δ   d e l t a d e l t a . Delta Modulation The type of modulation, where the sampling rate is much higher and in which the stepsize after quantization is of a smaller value  Δ , such a modulation is termed as  delta modulation . Delta Modulator The Delta Modulator comprises of a 1-bit quantizer and a delay circuit along with two summer circuits. Following is the block diagram of a delta modulator. The predictor circuit in DPCM is replaced by a simple delay circuit in DM. From the above diagram, we have