Discussion
Arrange these events in the order they occur along a pulse code link.
1. The message is band-limited by a filter
2. Samples are quantised and encoded
3. Pulses are regenerated at intermediate points
4. A reconstruction filter recovers the waveform
Select the correct sequence.
Answer: D
The order is 1, 2, 3, 4. Each step depends on the one before it: filtering must precede sampling because aliasing is irreversible, coding must precede transmission, regeneration happens along the route, and reconstruction is the last operation before the output. A chain whose order follows from the reasons for it can be reconstructed rather than memorised, which is more reliable under pressure.
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