Digital Communication refers to the field of study concerned with the transmission of digital data. In contrast with analog communications, a digital transmission can be broken down into discrete messages.
Transmitting data in discrete messages allows for greater signal processing capability. The ability top process a communications signal means that errors caused by random processes can be detected and corrected…..can also be sampled instead of continuously monitored and multiple signals can be multiplexed together to form one signal.
Different techniques of Digital communications can be understood by working on these kits that are accompanied with detailed student manuals. Circuit diagrams, inscriptions and legends printed on the pcb facilitates understanding the circuitry better and faster. Test Points are provided to analyze signals at different stages.
* Input Channels
– 2 Channel Time Division Multiplexed Pulse Code Modulation Receiver.
* Mode of Operation
– Fast (240 KHz/Channel approx)
– Slow (1Hz. /channel approx.)
* On-board features
– Pseudo random sync. Code generator for FRAME Synchronization.
– Receiver clock generation using PLL
– Error Detection of None, Even, Odd, Hamming
– Error Correction using Hamming Code technique
– None, Even, Odd, Hamming Parity selections
– Two Nos. of 4th order Butterworth Low pass filter with cut off frequency of 3.4 KHz.
– Four Switched Faults for Fault Selection
– Block Description Screen printed on glassy epoxy PCB
– All interconnections are made using 2mm banana Patch cords.
* Test points are provided to analyze signals at various points.
* All ICS are mounted on IC Sockets.
* Bare board Tested Glass Epoxy SMOBC PCB is used.
* In-Built Power Supply of +5V/1.5A, ±12V/250mA with Power ON indication
* Attractive Wooden enclosures of Light weight Australian Pine Wood.
* Set of 2mm Patch cords for interconnections
* User’s Manual with sample experimental programs
LIST OF EXPERIMENTS
– Study of Sampling and Multiplexing Techniques and the Reconstruction
– To study the principles of Analog to Digital and Digital to Analog Conversion
– Study of Pseudo Random Sequences
– Study of Error Check Code Logic:
– None Parity Coding.
– Odd Parity Coding
– Even Parity Coding