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PULSE CODE MODULATION

Laboratory Procedure I . PCM Familiarization A. The analog to digital conversion properties of the PCM was investigated in the last experiment. The “start” bit and the 7 data bits and two “stop” bits were identified. It was also found that if the parity switch is on, then the 1st stop bit is changed to an even parity bit. That is, the 7 data bits plus the parity bit will always be an even number (refer to figure 8 B) B. Set up Figure 8A. the MSB-LSB quantization switches are to be implemented using the Sample and hold and Quantizer blocks | EXPERIMENT 8 PULSE CODE MODULATION 1 27 2010 Group PURPOSE The objectives of this laboratory are 1. To investigate the serially encoded PCM signal. 2. To make signal-to-noise measurements of the PCM system. 3. To investigate synchronous and asynchronous PCM techniques. 4. To investigate properties of the TDM-PCM communication system. EQUIPMENT LIST 1. PC With Matlab and Simulink Laboratory Procedure I . PCM Familiarization A. The analog to digital conversion properties of the PCM was investigated in the last experiment. The start bit and the 7 data bits and two stop bits were identified. It was also found that if the parity switch is on then the 1st stop bit is changed to an even parity bit. That is the 7 data bits plus the parity bit will always be an even number refer to figure 8 B B. Set up Figure 8A. the MSB-LSB quantization switches are to be implemented using the Sample and hold and Quantizer blocks. The outputs is to be fed via a MUX and the input compared with the output and the error in tracing the signal is observed using a very low frequency sine wave. The effect of changes in amplitude should also be studied. All the results should match the ones summarized below. figure 8A a PCM timing The output of the above circuit implementation is shown below in the following CRO .