Question

(20%) The block diagram of a standard PCM system is shown in Figure 4. Answer the following questions. Source of continuous- time message signal Low-pass filter Sampler Quantizer Encoder PCM signal applied to channel input Distorted PCM signal produced at channel output Regenerative repeater (a) Transmitter (b) Transmission path Regenerative repeater Regenerated PCM signal applied to the receiver Final channel output Regeneration circuit Decoder Reconstruction filter Destination (c) Receiver Figure 4: The basic elements of a PCM system (a) In the subfigure (a) for the PCM transmitter, explain the function of the \"Low-Pass Filter\" and why we need it. (b) In the subfigure (a) for the PCM transmitter, explain the functions of the \"Quantizer\" and the \"Encoder\". Why do we need them? (c) In the subfigure (b), explain why we need a few \"Regenerative Repeaters\" along the transmis- sion path.

          (20%) The block diagram of a standard PCM system is shown in Figure 4. Answer the following
questions.
Source of
continuous-
time message
signal
Low-pass
filter
Sampler
Quantizer
Encoder
PCM signal
applied to
channel input
Distorted PCM
signal produced
at channel output
Regenerative
repeater
(a) Transmitter
(b) Transmission path
Regenerative
repeater
Regenerated
PCM signal
applied to the
receiver
Final
channel
output
Regeneration
circuit
Decoder
Reconstruction
filter
Destination
(c) Receiver
Figure 4: The basic elements of a PCM system
(a) In the subfigure (a) for the PCM transmitter, explain the function of the \"Low-Pass Filter\" and
why we need it.
(b) In the subfigure (a) for the PCM transmitter, explain the functions of the \"Quantizer\" and the
\"Encoder\". Why do we need them?
(c) In the subfigure (b), explain why we need a few \"Regenerative Repeaters\" along the transmis-
sion path.

(20%) The block diagram of a standard PCM system is shown in Figure 4. Answer the following
questions.
Source of
continuous-
time message
signal
Low-pass
filter
Sampler
Quantizer
Encoder
PCM signal
applied to
channel input
Distorted PCM
signal produced
at channel output
Regenerative
repeater
(a) Transmitter
(b) Transmission path
Regenerative
repeater
Regenerated
PCM signal
applied to the
receiver
Final
channel
output
Regeneration
circuit
Decoder
Reconstruction
filter
Destination
(c) Receiver
Figure 4: The basic elements of a PCM system
(a) In the subfigure (a) for the PCM transmitter, explain the function of the L̈ow-Pass Filteränd
why we need it.
(b) In the subfigure (a) for the PCM transmitter, explain the functions of the Q̈uantizeränd the
Ëncoder.̈ Why do we need them?
(c) In the subfigure (b), explain why we need a few R̈egenerative Repeatersälong the transmis-
sion path.

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