![]() ![]() But why WOULD someone want to avoid them in playback? Except in rare cases, a filmmaker wants the sync beeps, in fact, needs the sync beeps. And there'd be a button or switch for accomplishing it. #Claquette tv frequency how to#If they could, surely the manual would explain how to go about doing so. I strongly believe the sync beeps we hear were triggered by the cameras, though, which leads me all the way back to my original supposition that the sync beeps cannot be "turned off" in playback. Regarding frequencies, I don't have a clue, so I can't help you there. I presume the beeps are triggered from the pilot input signal from the camera but then why is the frequency not closer to 1 kHz?Ĭlick to expand.Thank you for giving this so much thought and research. The "beeps" on the Beatles Nagras seem to be made up of integer multiples of the fundamental (approximately 850 Hz) - not sure if this indicates whether it is the manually inserted zero-reference-level "whistle" or the pilot input triggered "startmark". I'm just wondering if it's possible that the zero-reference-level "whistle" could have been used as a crude marker system instead of using the camera to trigger the "startmarker" signal, in which case the tone would be across the whole tape in phase and thus not cancellable/avoidable. Unless it is only one record head that marks only half the tape in which case the unmarked audio may be retrievable by using a stereo playback head and selecting the clear half? So, while the pilot tone (if being used) can be separated from the recorded audio due to being recorded as two tracks inverted in phase with respect to one another, the "startmark" is perhaps not separable. It does seem from the schematics that the "startmark" input from the camera will create a tone (nominally 1 kHz) straight to the record heads, bypassing the neo-pilot heads (which are responsible for the pilot tone). I wonder if this is just a function of the voltage of the trigger from the camera causing the lower frequency tone or does it indicate something else? Oddly, the beeps on the Beatles Nagras seem to be around 850 Hz (accounting for playback speed error). #Claquette tv frequency generator#It seems that the while the marker (beep) can be triggered by the camera via pin 6 on the pilot input connector (if the Nagra III has the pilot option installed), the marker itself is derived from a 1 kHz tone generator inside the Nagra III. ![]()
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