The Basics of Synchronization and Time Code (2)

The Music Telegraph | Text 2019/08/08 [11:15]

The Basics of Synchronization and Time Code (2)

The Music Telegraph| 입력 : 2019/08/08 [11:15]

 

© Giphy



 

The Basics of Synchronization and Time Code (2)

 

 

Coding and Display Methods

 

1. Longitudinal Time Code (LTC)

- Each address consists of an 80-bit word

- The code is typically recorded onto an analog, linear audio track of a VTR or ATR

- It is an audio signal

 

2. Vertical Interval Time Code (VITC)

- A 90-bit word inserted in both fields of a video frame synchronous with the composite video signal

- It is a video signal

 

3. Burned In Time Code (BITC)

- This is a visual display of time code in the video image, used for spotting

- It is not signal, just an image

 

4. MIDI Time Code (MTC)

- MTC is used for transmitting time code information using MIDI cables often found on sequencers

 

 

Time Code Types

 

Frame Rate:

- The number of frames that go by in one second of real time

- It is measured in fps (frames per second)

 

Frame Rates:

24 fps -->  Film

25 fps -->  European Video (PAL, SECAM)

30 fps --> American and Japanese black and white video. Very little balck and white video is produced any more, but this frame rate lives on in the SMPTE spec. Actually, most 30 fps SMPTE code is generated for audio in large recording studios that like to sync multitrack decks together. 

29.97 fps --> American and Japanese color video (NTSC). Almost all video derived SMPTE runs at this rate. This 29.97 fps frame rate creates a problem because it is not a whole number like PAL's 25 fps. 

 

 

 

 

 

 

광고
광고
Audio Engineering (popular articles)
광고
광고
광고
광고
광고
광고
광고
광고
광고