Film-Tech Forum ARCHIVE: Accumulator in the middle position, Why?

This is topic Accumulator in the middle position, Why? in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Iben Jimenez (Member # 3713) on 05-21-2006, 02:53 PM:

Hi People:
When an interlock is running, you must set the accumulator in the middle of it's travel, but, Why this is so?. Also, I have heard a lot of times a "beep" sound at the end of a trailer, Is this because of the splice?
Thanks
I Jimenez

Posted by Darryl Spicer (Member # 711) on 05-21-2006, 03:10 PM:

The accumulator is just a rule of thumb as far as being in the middle. This allows for an unexpected problems associated with the start up that could cause the level to drop or rise unexpectedly.

The beep on trailers is because not enough black was removed to remove the tone in the soundtrack.

Posted by Iben Jimenez (Member # 3713) on 05-21-2006, 03:42 PM:

Quote:
The beep on trailers is because not enough black was removed to remove the tone in the soundtrack.

Thanks for your reply Darryl. But I don't undertand yet that of the soundtrack.

Thanks

Posted by Darryl Spicer (Member # 711) on 05-21-2006, 05:41 PM:

Sometimes at the end of trailers you can run accross a tone or beep in the soundtrack that is basically junk. You want to cut that out to avoid the beep or whatever sound it makes to be heard.

Posted by Gordon McLeod (Member # 33) on 05-21-2006, 06:14 PM:

the beep also called pip is the sync point and is the match between picture and sound negatives

Posted by Bruce McGee (Member # 131) on 05-21-2006, 08:43 PM:

I heard a beep between the attached trailer on Oliver Twist and the beginning of the feature. Bad Sony! [Big Grin]

Posted by Carl Martin (Member # 1146) on 05-23-2006, 12:59 AM:

also be careful of beeps in the digital tracks. if you see the beep in the analog track, you have to cut off an additional 6 frames to avoid the srd beep. i don't know offhand what the offset is for the sdds track; maybe that complicates it further?

Posted by Kris Dirix (Member # 3012) on 05-24-2006, 05:28 AM:

The SRD-bleep is visible as a group of two black and two white blocks.

Posted by Carl Martin (Member # 1146) on 05-26-2006, 03:37 AM:

kris, do you have a picture of that you could post? i'm not entirely sure what you mean.

i wouldn't think an all-black or all-white block would be valid srd data. or is it only necessary for it to be seen by human eyes for synching up, and the "bleep" term has stuck?

i do know that an auditory bleep can be encoded in srd; i've had to remove one from the tail of a trailer even after the sr bleep was cut.