[Top] [All Lists]

1. Re: Simultaneous recording with two digital recorders?

Subject: 1. Re: Simultaneous recording with two digital recorders?
From: "Dan Dugan" dandugan_1999
Date: Tue Jun 19, 2012 10:13 pm ((PDT))
> Has anyone had experience of recording on two independant digital recoder=
s, using say a handclap to provide a sync point, then mixing/layering them =
together later.

I used to do that a lot, first with two Sharp MD recorders, and then up to =
the 2011 season with two LS-10s.

I use the Rich Peet 4-channel surround technique, which is to use a stereo =
array for the front channels, creating imaging across the front panorama, a=
nd two widely spaced mics for the rear channels, intentionally uncorrelated=
 and not imaging. With this arrangement the synchronization accuracy betwee=
n front and rear pairs isn't particularly critical, i.e., doesn't have to b=
e phase accurate as in real multitrack recording, only within a few millise=
conds to work just fine.

I start both recorders and make a "head click" with a party clicker. When I=
'm ready to end the take, usually an hour or 90 minutes later, I make a "ta=
il click."

In post, first I line up the head clicks exactly. Then I go to the end and =
mark where the tail clicks are. The difference between them represents the =
difference in the clocks of the two machines.

I take the front pair as, arbitrarily, correct, and calculate a speed corre=
ction for the rear pair based on the measuring the number of samples in eac=
h head-to-tail clicks span. I enter that correction into Pitch-n-Time as a =
"classic" varispeed change--this changes both pitch and time together, whic=
h is what you want because the two clocks are not at the same rate. Here a =
small compromise is made because PnT allows fewer significant digits than I=
 would like.

I process the rear pair so that the head and tail clicks of both pairs now =
line up (the tail clicks not being exactly on but close). This process is t=
he same as a sample rate conversion, and can be done with very high quality=
 (not the case when making tempo changes without changing pitch).

Finally I offset the rear pair based on my knowledge of the distances to th=
e different mics from the clicker. If I clicked at the front array and the =
rears are 40' out either side, I would offset the rears around 40 milliseco=

This all is a bit of a chore but the results sound good.


"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.

Yahoo! Groups Links

<*> To visit your group on the web, go to:

<*> Your email settings:
    Digest Email  | Traditional

<*> To change settings online go to:
    (Yahoo! ID required)

<*> To change settings via email:

<*> To unsubscribe from this group, send an email to:

<*> Your use of Yahoo! Groups is subject to:


<Prev in Thread] Current Thread [Next in Thread>

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the naturerecordists mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU