0195136047.pdf

720 COMMUNICATION SYSTEMS

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Σ

+

+

f 2 (t) LPF Sampler + Compressor

f 1 (t)

f 2 (t)

Ts

Ts

Ts

t

2 Ts 3 Ts

3

1

1

2

(^121)
Guard time τg
Time slot
Frame
2
2
N
τ
t
t
3 Ts
3 Ts
2 Ts
2 Ts
fN(t) LPF
Timing 2

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... ... ... ... ...

Sampler

Timing N

(a)

(b)

(c)

(d)

A Uniform

quantizer

Binary

encoder

Binary PCM

Waveform

formatter

f 1 (t) LPF Sampler

Timing 1

Figure 15.3.9(a)Time multiplexing forNsimilar analog signals.(b)Waveform at pointAfor message

signal 1.(c)Waveform at pointAfor message signal 2.(d)Full waveform at pointA.