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APPENDIX
145
B SMPTE Synchronization Basics
OVERVIEW
This chapter explains what SMPTE synchroni-
zation is, how it works, and how to synchronize
using the MIDI Timepiece AV.
What Is synchronization? . . . . . . . . . . . . . . . . . .145
What is SMPTE? . . . . . . . . . . . . . . . . . . . . . . . . . .145
Two forms of SMPTE: LTC versus VITC . . . . .145
What is LTC?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
What is VITC? . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
The benefits of VITC over LTC. . . . . . . . . . . . . .146
Should I use LTC or VITC? . . . . . . . . . . . . . . . . .146
Frame rates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
What is drop frame? . . . . . . . . . . . . . . . . . . . . . . .147
Why does drop frame exist? . . . . . . . . . . . . . . . .147
Should I use drop frame?. . . . . . . . . . . . . . . . . . .147
How does SMPTE synchronization work?. . . .148
How does a MOTU synchronizer work?. . . . . .148
What is MIDI Time Code?. . . . . . . . . . . . . . . . . .148
Locking a MOTU interface to SMPTE . . . . . . .148
WHAT IS SYNCHRONIZATION?
Synchronization is the occurrence of two or more
events at exactly the same point in time. In regard
to SMPTE and MIDI, it is the process of making
MIDI devices, such as a MIDI sequencer, precisely
follow an audio tape as it plays back. When the tape
plays, the sequencer plays right along with it. When
the tape fast forwards to a new location and begins
to play, the sequencer will jump ahead to precisely
the same location and begin playing, too. Synchro-
nization allows you to freely move about in a piece
of music without ever losing the “lockup” between
the tape and the sequencer.
Without synchronization, devices with
independent time bases, no matter how precisely
they keep time, will inevitably drift apart from one
another over time.
WHAT IS SMPTE?
The word SMPTE is an acronym for the Society of
Motion Picture and Television Engineers. In the
mid 1970’s, the society established a timing
standard, called SMPTE time code, that is now an
international standard. SMPTE time code,
commonly referred to as just “SMPTE”, was
developed for film and video work but has proven
to be very useful in normal audio work as well. It is
an absolute time code, expressing hours, minutes,
seconds and divisions of a second in digital form.
Because of its accuracy and wide-spread
acceptance, SMPTE is the most powerful of the
time code formats that are used in audio
production.
TWO FORMS OF SMPTE: LTC VERSUS VITC
SMPTE time code consists of a series of binary
impulses that are recorded onto each frame on film
or video tape, or continuously on audio tape. These
binary impulses count each frame, expressing its
location in hours, minutes, seconds, and frames.
SMPTE has two forms:
1. an audio signal, called Longitudinal Time Code
(LTC), or
2. a video signal recorded in the vertical blanking
segment of video frames, called Vertical Interval
Time Code (VITC)
!USB Interfaces Manual Book Page 145 Tuesday, October 10, 2000 12:43 PM
- Composite 1
- Warranty on Software 2
- Limited Warranty on Hardware 2
- MOTU USB MIDI Interfaces 3
- Contents 5
- For All Users 7
- All Users 8
- Packing List and 9
- Computer Requirements 9
- FOR ALL MOTU INTERFACE MODELS 11
- FOR MIDI TIMEPIECE AV USERS 11
- CONNECTING THE POWER CORD 11
- CONNECTING A USB COMPUTER 11
- CONNECTING MIDI GEAR 11
- MIDI CONNECTIONS WORKSHEET 13
- CONNECTING ADATS 16
- CONNECTING VIDEO 16
- CONNECTING WORD CLOCK 17
- CONNECTING AN ALESIS LRC 17
- CONNECTING A MACINTOSH 18
- WHAT NEXT? 19
- WHAT GETS INSTALLED? 21
- WHERE TO GO NEXT 21
- SMPTE Sync and MMC with a 23
- Windows Sequencer 23
- SLAVING A SEQUENCER TO SMPTE 24
- FOR FURTHER INFORMATION 25
- For XT & Micro Users 27
- XT& Micro Users 28
- Working with Presets 29
- WORKING WITH PRESETS 30
- Express XT and micro express 30
- WORKING WITH PRESETS 31
- USER PRESETS 32
- Using Micro Express Console 33
- THE TOOLBAR 34
- SMPTE frame rate 35
- WINDOWS MIDI PORTS 36
- MIDI ROUTING WINDOW 37
- USING MICRO EXPRESS CONSOLE 38
- USING MICRO EXPRESS CONSOLE 39
- FILTER WINDOW 41
- CHANNEL MAP WINDOW 42
- SYNC WINDOW 43
- TOOLBAR SYNC DISPLAY 46
- PEDAL WINDOW 48
- MAKING CLICK-TO-MIDI SETTINGS 50
- Using MIDI Express XT Console 53
- USING MIDI EXPRESS XT CONSOLE 58
- SMPTE Synchronization 73
- SMPTE SYNCHRONIZATION 74
- LTC MODE 76
- MTC MODE 77
- MIDI Machine Control 79
- SETTING MMC DEVICE ID’S 80
- SETTING UP OTHER MMC DEVICES 80
- SETTING UP A HARDWARE MMC 80
- CONTROLLER 80
- MIDI MACHINE CONTROL 81
- Part III 83
- For MTP AV Users 83
- MPT AV Users 84
- THE ADVANCED MIDI WINDOW 100
- WORKING WITH SETUPS 101
- Using the Front Panel LCD 103
- JAM SMPTE 104
- WORKING WITH BASE SETUPS 106
- BaseSetup 1 N 107
- BASE-SETUP 1 107
- Basic Studio YE 107
- WRITE OVER 1 107
- MAKING THE GLOBAL HARDWARE 109
- SETTINGS 109
- PERFORMING A MIDI DATA DUMP 110
- USING THE SMPTE CONTROLS 110
- D +00:00:00/00 E 112
- THRESHOLD 10 114
- CLICK DECAY 10 E 114
- MIDI ROUTING 116
- MUTING MIDI DATA 116
- MIDI CHANNEL MAP 116
- OUT CHANEL REMAP 117
- OUT_1CH 7 TO 1 117
- MIDI cannon 118
- Console 118
- Synchronization with the AV 119
- CHOOSING A MASTER SYNC MODE 120
- SYNCHRONIZATION WITH THE AV 121
- LOCKING TO VIDEO 122
- SLAVING ADATS 124
- SLAVING A MOTU 2408 SYSTEM 124
- Component 125
- Setting for the 125
- ADAT sync scenario 125
- I Timepiece AV a certain 127
- SYNCHRONIZATION WITH THE AV 128
- ” (starting frame) — the 131
- OVERVIEW 133
- HOW MMC WORKS 133
- MMC device ID # 134
- MTP-AV 20 E 134
- adat 1 E 134
- MMC REMOTE CONTROL OF RECORD 136
- FUNCTIONS 136
- MMC ROUTING EXAMPLE 136
- A-_ 0 B-_ 0 E 137
- PEDAL TYPE 138
- PEDAL B>LRC E 138
- Appendices 141
- Glossary 143
- APPENDIX A: GLOSSARY 144
- APPENDIX A: GLOSSARY 145
- SMPTE Synchronization Basics 147
- WHAT IS LTC? 148
- WHAT IS VITC? 148
- THE BENEFITS OF VITC OVER LTC 148
- SHOULD I USE LTC OR VITC? 148
- FRAME RATES 148
- WHAT IS DROP FRAME? 149
- WHY DOES DROP FRAME EXIST? 149
- SHOULD I USE DROP FRAME? 149
- Troubleshooting and Customer 151
- TROUBLESHOOTING 152
- CUSTOMER SUPPORT 152
- REPLACING DISKS 152
- TECHNICAL SUPPORT 152
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