The Four-Channel FDM Link That Needed 95 kHz
FDM channel bandwidths are not the whole spectrum plan. Guard bands between channels also consume frequency space.
Topic: Communications
The PCM Link That Needed 64 kbps, Not 32
Analog bandwidth is not the same as sampling rate. A 4 kHz voice signal can produce a 64 kbps PCM stream.
The AM Signal Whose Envelope Pinched Shut
A stronger message signal can break conventional AM envelope detection when the modulation index exceeds 1.