Sound operator's call confirming synchronized audio recording readiness across all equipment; originated 1929 with mechanically coupled sound film systems.
With analog Nagra recorders of the 4 series, the industry standard until the 1990s, the tape speed stabilized after exactly 2.8 seconds to a precise 38.1 cm/s. Modern digital recorders like Sound Devices 833 or Zaxcom Nova achieve immediate recording readiness, but the command is retained for workflow reasons. Synchronization today is done via timecode with an accuracy of ±0.1 ppm (Parts per Million). In multi-camera productions, the production sound mixer coordinates up to 32 wireless systems simultaneously, with each receiver having a latency of 2-4 milliseconds.
The command originated in 1929 with the introduction of the Western Electric System for sound films in Hollywood, when camera and sound recording were first mechanically coupled. Perfection was achieved in 1951 by Stefan Kudelski with the first portable Nagra recorder, which enabled precise speed control through pilot tone. In 1971, SMPTE introduced the timecode standard, replacing mechanical coupling with electronic synchronization. Since the digital revolution around 2005 with devices like the Sound Devices 744T, synchronization has been done via embedded timecode at 48 kHz/24 bit resolution.
On "Dunkirk" (2017), production sound mixer Richard King used eight synchronized recording tracks for the complex aircraft sequences, with each "Sound Speed" confirming the exact coordination of all devices. In "1917" (2019), the sound team coordinated up to 16 wireless microphones simultaneously during the seemingly continuous single-take sequences. The workflow begins with "Camera rolling," followed by "Sound Speed" after 2-3 seconds, then "Action." For exterior shots with wind, the sound assistant checks the levels of all channels at -20 dBFS peak before each "Sound Speed."
"Sound rolling" is used synonymously, but "Sound Speed" is the more precise technical term for confirmed recording readiness. Unlike "Speed" (camera command), "Sound Speed" refers exclusively to audio equipment. In live productions, "Audio ready" replaces the traditional command. Modern timecode generators like Tentacle Sync allow for untethered synchronization, partially replacing the coordinating "Sound Speed" with automatic sync confirmation. For high-speed recordings above 120 fps, sound recording is done separately, and "Sound Speed" is omitted entirely.
Ich warte nach meinem "Kamera läuft" immer die vollen drei Sekunden auf "Ton ab", bevor ich die finale Schärfe justiere – diese Zeit nutze ich für letzte Korrekturen am Fokus oder Bildausschnitt. Bei Handheld-Aufnahmen bedeutet "Ton ab" für mich auch, dass alle Funkmikrofone aktiviert sind und ich keine Interferenzen in der elektronischen Sucher-Übertragung erwarten muss.
Das "Ton ab" ist für mich der Moment, wo ich mental von der technischen in die kreative Phase wechsle – ab diesem Punkt konzentriere ich mich nur noch auf die Performance der Darsteller. Ich nutze diese 2-3 Sekunden bewusst für einen letzten Blick auf die Szene und um mich emotional auf die kommende Einstellung einzustimmen, bevor ich "Action" rufe.
"Ton ab" kostet mich durchschnittlich 3 Sekunden pro Take, bei 150 Takes täglich sind das 7,5 Minuten reine Wartezeit – auf einen 50-Drehtag-Schedule gerechnet über 6 Stunden. Ich kalkuliere diese Zeit fest in meine Tagespläne ein und achte darauf, dass der Tonmeister die Geräte bereits während Licht-Setup vorlaufen lässt, um Verzögerungen zu minimieren.
1. Was beschreibt „Ton ab" am besten?
2. Zu welchem Department gehört „Ton ab"?
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The Lexikon is part of the Filmfarm ecosystem — alongside budgeting (FilmBalance), an industry magazine (FilmCircus) and crew networking (FilmCall, CrewMesh). One shared vocabulary for the whole production.