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The 7404 is one of a range of digital communication trainers and provides all necessary inputs and connections for students to study decoding and demultiplexing of data transmitted b model 7403, the pulse code modulation transmitter. On-board PLL provides regeneration of clock. Synchronisation between transmitter and receiver is provided by pseudo random code.
Features:
- Functional blocks indicated via on board mimics
- Test points
- Fully documented student workbook
- Input accepts two channel multiplexed data
- On-board demultiplexed pulse code modulation receiver
- On-board 1.P. Filter
- Fast and slow modes for real time operation and examination of control signal and data on LED
- On-board PLL for clock regeneration
- On-board sync code detector
- Error check code option
- Odd or even parity - single bit error detection
- Hamming code - single bit error detection
- 4 Switched faults allow different error check code options
Experiments:
- Study of PCM demodulation technique
- Study of time division demultiplexing of PCM data
- Study of clock regeneration by PLL
- Study of detection and correction of error induced by switched faults in the transmitter
- Study of signal recovery in 3 connecting modes between transmitter and receiver
- Study of importance of clock and frame synchronisation in the PCM system
- Study of the effect of induced faults in receiver
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