Chapter 8 Multiplexing

Multiplexing is the process of

• several signal sources transmitting simultaneously to a receiver on a common frequency

• sending the same signal over multiple channels to multiple destination

• transmitting multiple signals over multiple channels

• sending multiple signals simultaneously over a single channel

In FDM, multiple signals

• transmit at different times

• share a common bandwidth

• use multiple channels

• modulate one another

Each signal in an FDM system

• modulates a subcarrier

• modulates the final carrier

• is mixed with all the others before modulation

• serves as a carrier

Which of the following is not a typical FDM application

• telemetry

• stereo broadcasting

• telephone

• secure communications

The circuit that performs demultiplexing in an FDM system is a(n)

• op amp

• bandpass filter

• discriminator

• subcarrier oscillator

In TDM, multiple signals

• share a common bandwidth

• modulate subcarriers

• are sampled high speeds

• take turns transmitting

In TDM, each signal may use the full bandwidth of the channel

• true

• false

• none of the choices

Converting analog signals to digital is done by sampling and

• quantizing

• companding

• pre-emphasis

• mixing

A quantizer is a(n)

• multiplexer

• demultiplexer

• A/D converter

• D/A converter

Emphasizing low-level signals and compressing higher-level signals is called

• quantizing

• companding

• pre-emphasis

• sampling