The Basics of Synchronization and Time Code

The Music Telegraph | Text 2019/07/19 [15:26]

The Basics of Synchronization and Time Code

The Music Telegraph| 입력 : 2019/07/19 [15:26]

 

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The Basics of Synchronization and Time Code

 

 

What is Synchronization?

- Having two or more audio/video devices running at the same playback/record speed (by following a common reference of fixed frequency), starting at a specific point in time

- When machines are synchronized, one or more 'Slaves' follow one 'Master' device in time, over time

- The Master is the "conductor" designated to control other "players" (slaves) in a system

 

 

Methods of Synchronization

- Trigger Sync: a simple method in which the master device just commands the slave devices when to begin playback

- Continuous Resynchronization: a method in which the master device sends out a signal, a time code, which is used to identify a precise location in time. The slave devices read this time code and adjust playback speed to keep locked to the master

 

 

What is Drift?

- Drift is a timing problem between at least two devices

- When a machine is running at a different speed relative to its reference, it will not be 'in time'with others and will drift apart

- The problem is commonly associated with not having used, or not using a common reference

 

 

What is Time Code?

- A signal that contains address information, allowing machines to arrive at and start from specific points on the tape

 

 

Time Code Standards:

 

1. EBU (European Broadcast Union) Time Code

- This time code is used in Europe

- It is based on an AC power frequency of 50 Hz

- This type of Time Code runs at a rate of 25 fps (Frames Per Second)

- Both motion pictures and television use this time base

 

2. SMPTE (Society of Motion Picture and Television Engineers) Time Code

- This time code is used in the United States and Japan

- It is based on an AC power frequency of 60 Hz

- Film and video in these countries have different speeds and frame counts

 

 

Reference Frequency

- The signal used to determine the rate at which the generators and synchronizers will run 

 

 

 

 

   

 

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