About: MIDI timecode

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MIDI time code (MTC) embeds the same timing information as standard SMPTE timecode as a series of small 'quarter-frame' MIDI messages. There is no provision for the user bits in the standard MIDI time code messages, and SysEx messages are used to carry this information instead. The quarter-frame messages are transmitted in a sequence of eight messages, thus a complete timecode value is specified every two frames. If the MIDI data stream is running close to capacity, the MTC data may arrive a little behind schedule which has the effect of introducing a small amount of jitter. In order to avoid this it is ideal to use a completely separate MIDI port for MTC data. Larger full-frame messages, which encapsulate a frame worth of timecode in a single message, are used to locate to a time while ti

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  • MIDI time code (MTC) embeds the same timing information as standard SMPTE timecode as a series of small 'quarter-frame' MIDI messages. There is no provision for the user bits in the standard MIDI time code messages, and SysEx messages are used to carry this information instead. The quarter-frame messages are transmitted in a sequence of eight messages, thus a complete timecode value is specified every two frames. If the MIDI data stream is running close to capacity, the MTC data may arrive a little behind schedule which has the effect of introducing a small amount of jitter. In order to avoid this it is ideal to use a completely separate MIDI port for MTC data. Larger full-frame messages, which encapsulate a frame worth of timecode in a single message, are used to locate to a time while timecode is not running. Unlike standard SMPTE timecode, MIDI timecode's quarter-frame and full-frame messages carry a two-bit flag value that identifies the rate of the timecode, specifying it as either: * 24 frame/s (standard rate for film work) * 25 frame/s (standard rate for PAL video) * 29.97 frame/s (drop-frame timecode for NTSC video) * 30 frame/s (non-drop timecode for NTSC video) MTC distinguishes between film speed and video speed only by the rate at which timecode advances, not by the information contained in the timecode messages; thus, 29.97 frame/s dropframe is represented as 30 frame/s dropframe at 0.1% pulldown. MTC allows the synchronisation of a sequencer or DAW with other devices that can synchronise to MTC or for these devices to 'slave' to a tape machine that is striped with SMPTE. For this to happen a SMPTE to MTC converter needs to be employed. It is possible for a tape machine to synchronise to an MTC signal (if converted to SMPTE), if the tape machine is able to 'slave' to incoming timecode via motor control, which is a rare feature. (en)
  • Il codice temporale MIDI (MIDI Time Code) o (MTC) inserisce le informazioni standard del timecode SMPTE come una serie di messaggi MIDI. Ogni messaggio occupa un quarto di fotogramma. Gli user bit non sono inclusi in questi messaggi e vengono trasportati dai messaggi SysEx. I messaggi sono trasmessi come sequenza di otto messaggi, per cui un valore completo di timecode è trasmesso ogni due fotogrammi. Se il flusso dati MIDI è prossimo alla saturazione, i dati MTC possono arrivare in leggero ritardo, comportando così un piccolo errore di jitter: per evitare questo è raccomandabile l'uso di una porta MIDI completamente separata per il timecode. A differenza del timecode standard SMPTE, la sequenza di otto messaggi MIDI trasporta due bit di flag per identificare la cadenza del timecode: * 24 Fps (standard per la cinematografia) * 25 Fps (standard per il video PAL) * 30/1.001 Fps (timecode drop frame per video NTSC) * 30 fps (video NTSC monocromatico) La tecnica MTC permette la sincronizzazione di un sequencer o di una DAW con altri dispositivi in grado di agganciarsi al timecode MIDI, oppure è possibile per questi dispositivi controllare un registratore dotato di timecode SMPTE, tramite l'impiego di un convertitore SMPTE/MTC. (it)
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  • MIDI time code (MTC) embeds the same timing information as standard SMPTE timecode as a series of small 'quarter-frame' MIDI messages. There is no provision for the user bits in the standard MIDI time code messages, and SysEx messages are used to carry this information instead. The quarter-frame messages are transmitted in a sequence of eight messages, thus a complete timecode value is specified every two frames. If the MIDI data stream is running close to capacity, the MTC data may arrive a little behind schedule which has the effect of introducing a small amount of jitter. In order to avoid this it is ideal to use a completely separate MIDI port for MTC data. Larger full-frame messages, which encapsulate a frame worth of timecode in a single message, are used to locate to a time while ti (en)
  • Il codice temporale MIDI (MIDI Time Code) o (MTC) inserisce le informazioni standard del timecode SMPTE come una serie di messaggi MIDI. Ogni messaggio occupa un quarto di fotogramma. Gli user bit non sono inclusi in questi messaggi e vengono trasportati dai messaggi SysEx. I messaggi sono trasmessi come sequenza di otto messaggi, per cui un valore completo di timecode è trasmesso ogni due fotogrammi. Se il flusso dati MIDI è prossimo alla saturazione, i dati MTC possono arrivare in leggero ritardo, comportando così un piccolo errore di jitter: per evitare questo è raccomandabile l'uso di una porta MIDI completamente separata per il timecode. (it)
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  • MIDI timecode (it)
  • MIDI timecode (en)
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