The RM Synchronizer is designed to operate with a standard Sony 9-pin remote, using a scalable extended Sony protocol. OEM customers may extend their existing machine control using the functions they require, or develop full synchroniser interface with individual machine control and status display.
The RM Serial remote/Synchronizer uses experience gained from both the SR and MR series remote control system. Designed to be used with existing consoles and DAW's this unit will expand a single Sony Protocol serial port to five serial ports. The various serial protocol options allow the RM Synchronizer unit to act as a serial protocol converter.
A single machine or virtual machine(Generator) is controlled by the serial input, the chase function expands this to up to five machines. Record On and Off are sent to all record enabled machines. Record track arming is provided for up to 100 tracks and may be mapped over all machines either by the user or an automatic algorithm.
The Video and Audio Post Production process requires the playback and record machines involved to be kept in controlled time synchronisation. This can be achieved using SMPTE/EBU timecode, MIDI timecode, RS422 position or Biphase clock. Timecode was devised by the Society of Motion Picture and Television Engineers (SMPTE) to enable synchronisation between video and audio devices. The resulting standard was also adopted by the European Broadcasting Union (EBU). The original ‘longitudinal’ version or LTC records clock information divided into hours, minutes, seconds and frames as a separate audio track onto tape along with the video or audio signal. VITC or Vertical Interval Timecode takes advantage of the ability of video machines with rotating heads to read thye timecode at low speed or stop. This allows position information to be available even when the tape transport is stopped.
The SR controllers have been developed from the MR remote control system using RS422 control and synchronisation facilities to enable video, audio and film equipment to be kept in time synchronisation. It is normal in a synchronised system to provide a master video reference to the system and for one machine such as a video recorder to be Master and all others to be Slaves or ‘Chase’ machines. A time offset may exist between the Master and one or more Slave machines depending on the ‘start’ timecode chosen when the playback material on the ‘Slave’ was created.
Digital sample rate synchronisation
Digital audio has the further requirement that the digital data sample rate is kept in step throughout the digital process. Digital data rate synchronisation requires that all digital audio machines be supplied with a sample rate reference such as wordclock or digital silence or a reference from which a sample rate can be derived such as video. Clicks and pops will result in recordings unless the same sample clock rate and phase is maintained in a system. When Wordclock is used as the machine reference and not video sync the machine must be slaved to timecode for absolute phase accuracy as there are approximately 2000 samples in one timecode frame. A Rosendahl nanosyncs or similar reference generator may be used to supply wordclock and video syncs from the same reference crystal or derive wordclock from a video sync source.
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