7th Sense Delta User Manual - Page 15

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Timing Glossary

29.97

Adrielec

ASIO / ASIO4ALL

drop frame (DF)

genlock

House Sync

LTC

LTC chasing

LTC Reader

non-drop frame (NDF)

NTSC

real time

SMPTE

SoundMan

Synchroni s i ng Del ta Medi a Sys tems

NTSC standard, the TV broadcast video framerate, originating from early

colour TV transmission problems between chrominance and audio carrier

signal phasing at 30 fps. Resolved through use of drop frame timecoding.

A SMPTE device enabling linear timecode (LTC) chasing. A product of

Adrienne Electronics Corporation (AEC).

Audio Stream Input/Output: a sound card driver protocol allowing

software direct access to sound cards to reduce latency. ASIO4ALL is a

generic driver for Windows Driver Model (WDM) devices.

In order to match video at 29.97 fps with real time clocks at 30 fps, this

time code drops two frames every minute, on the minute, except every

tenth minute.

Generator locking: the means by which multiple devices are linked to a

single synchronising clock signal.

Method by which an signal generator produces the time reference (clock

signal) for all genlocked servers in group, together with their channel

outputs and devices. The signal may be a square-wave pulse or word clock

for audio synchronisation.

Linear (or Longitudinal) Time Code: a form of SMPTE timecode encoded

into an audio signal along its duration.

Synchronising playback to a reference LTC audio signal.

A Delta utility app that translates the analogue LTC audio stream into

digital SMPTE code. Receives LTC timecode though a standard audio input

on a PC to enable LTC chasing.

30 fps timecode video source played back at 29.97 fps. Note that being

played more slowly this drifts from real time.

National Television System Committee; defined pre-digital standards.

Real time clocks (RTC) 'tell the time' rather than relative time

displacement.

Society of Motion Picture and Television Engineers; defines timecode

reference standards for positional identification and additional timecode

metadata.

SoundMan Server Virtual Sound System (Richmond Sound Design Ltd),

receives LTC timecode though a standard audio input on a PC to enable

LTC chasing.