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CHAPTER

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5

G3 FACSIMILE COMMU-
NICATIONS

1. INTRODUCTION...................................................................... 5-2

2. WHAT IS A “G3 FACSIMILE?”.................................................. 5-2

3. G3 FACSIMILE IMAGE TRANSMISSION ................................ 5-3

Structure of Image Signals.............................................. 5-3

Transmission Time .......................................................... 5-5

4. CODING SCHEMES ................................................................ 5-8

Why is Coding Necessary? ............................................. 5-8

MH Coding Scheme (One-dimensional Coding Scheme) ...... 5-10

MR Coding Scheme (Two-dimensional Coding Scheme) ...... 5-17

MMR Coding Scheme ................................................... 5-28

JBIG Image Compression Encoding Scheme ............... 5-29

5. MODULATION METHOD ....................................................... 5-45

Modulation and Demodulation ...................................... 5-45

Shift and Modulation Methods....................................... 5-46

Modulation Methods up to 9600 bps ............................. 5-47

High-speed MODEMs above 14400 bps....................... 5-55

V.17 (V.33) MODEM Technology ................................... 5-55

V.34 MODEM Technology ............................................. 5-73

6. TRANSMISSION CONTROL PROCEDURES ....................... 5-89

Outline of Transmission Control Procedures ................. 5-89

Signal Types .................................................................. 5-90

Basic Transmission Control Procedure ......................... 5-91

Procedures for Performing Individual Page Control (Q signals)...... 5-100

Training........................................................................ 5-102

Method for Detecting Image Signal Transmission Errors ..... 5-104

Option Signals ............................................................. 5-106

Structure of Binary Signals.......................................... 5-107

Example of G3 Procedures ......................................... 5-122

6.10 ECM Communications................................................. 5-123