Week 03
PCM and Line Coding
I use the saved course file to reconnect sampling, baseband transmission, digital modulation, and error-rate analysis.
What I connect in this unit
A PCM frame packages sampled values into fixed-length words, and line coding turns those bits into a transmit waveform. NRZ is bandwidth-efficient but long runs and DC content hinder clock recovery, whereas Manchester guarantees a mid-bit transition.
Concept map
- PCM frames
- NRZ and Manchester
- DC content
- Clock recovery
Technical anchor
With sample rate fs and N bits per sample, PCM bit rate is Rb = Nfs; Manchester uses a higher transition rate than NRZ and therefore more bandwidth.
How I review it
Draw 00111100 in unipolar NRZ, polar NRZ, and Manchester, then compare average level, longest transition-free interval, and available clock edges.
Connection to the full course
Unit 3 of 12. Unit numbers expand topics from the saved file into a concept sequence, not an attendance-week record.