generating word clock from black burst? at DVinfo.net

Bill Ravens · December 14th, 2006, 02:46 PM

Seems like there's a perennial problem of wanting to sync externally recorded audio to video. Any video camera that outputs a composite video signal has a built in sync signal in the form of a black burst signal. In fact, the Tascam HD-P2 uses this signal to sync their audio recorder to a camera video signal. I have a Sound Devices 702 digital audio recorder that can sync to a word clock input. Does anyone make a word clock signal generator that generates a sync signal from a black burst input signal?

Bob Grant · December 14th, 2006, 02:53 PM

Several word clock generators will lock to a video signal. Mostly black burst is nothing special, from waht I've seen anything that expects black burst on a n input will accept a plain video signal, black or not in the frame doesn't matter.
The only trap seems to be the quality of the word clock generator and how it handles loss of the video signal.

Steve Leverich · December 15th, 2006, 04:10 PM

http://www.nanosyncs.com/nanosyncs.html

Not cheap (around $1700 USD IIRC) but very stable, used by quite a few sound for pic people I've talked to - seems to be one of the few Rosendahl products B&H doesn't list tho... Steve

December 14th, 2006, 02:46 PM	#1
Bill Ravens Join Date: Nov 2001 Location: santa fe, nm Posts: 3,264 Images: 10	generating word clock from black burst? Seems like there's a perennial problem of wanting to sync externally recorded audio to video. Any video camera that outputs a composite video signal has a built in sync signal in the form of a black burst signal. In fact, the Tascam HD-P2 uses this signal to sync their audio recorder to a camera video signal. I have a Sound Devices 702 digital audio recorder that can sync to a word clock input. Does anyone make a word clock signal generator that generates a sync signal from a black burst input signal?

December 14th, 2006, 02:53 PM	#2
Bob Grant Trustee Join Date: Nov 2005 Location: Sydney Australia Posts: 1,570	Several word clock generators will lock to a video signal. Mostly black burst is nothing special, from waht I've seen anything that expects black burst on a n input will accept a plain video signal, black or not in the frame doesn't matter. The only trap seems to be the quality of the word clock generator and how it handles loss of the video signal.

December 15th, 2006, 04:10 PM	#3
Steve Leverich Regular Crew Join Date: Sep 2006 Location: Albany Oregon Posts: 173	http://www.nanosyncs.com/nanosyncs.html Not cheap (around $1700 USD IIRC) but very stable, used by quite a few sound for pic people I've talked to - seems to be one of the few Rosendahl products B&H doesn't list tho... Steve