showstack / glossary / quarter-frame
Quarter frame message 四分之一幀訊息
The MIDI Timecode message that carries four bits of a timecode value. Eight of them make one complete value, sent four per frame, so a value takes two frames to arrive. That is why a running MTC receiver is always two frames behind the transmitter and needs an offset applied. Locating while stopped uses the full-frame message instead.
中文
MIDI 時碼中攜帶四個位元時碼資料的訊息。八個組成一個完整的時碼值，每幀送四個，因此一個值需要兩幀才傳完。這就是為什麼運行中的 MTC 接收端永遠落後傳送端兩幀，必須補上偏移量。停止狀態下的定位改用 full frame 訊息。
Regional usage
| Where | Term | Note |
|---|---|---|
| UK / US | Quarter frame / QF | |
| HK / TW | 四分之一幀訊息 |
Easy to get wrong
The frame rate rides in piece 7, the last one, so a receiver does not know what rate it is being sent until a whole sequence has arrived.
Next to this
Drop frame丟幀時碼A timecode counting scheme that skips frame numbers 00 and 01 at the start of every minute except every tenth…Running status延續狀態A MIDI compression rule. If a status byte would be the same as the previous one, it can be omitted and only t…Frame rate影格率How many complete images a video signal carries per second. On a show it is a system-wide decision, not a per…
Where it shows up on the wire
Sources
- MIDI 1.0 Detailed Specification — MIDI Association primary
Understand the mechanism
Something wrong, or missing?
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