I just wanted to pop my head in and say "thanks" to those who put this list
together (Chris? Andrew?). I'm stoked to be a part of it now. I'd love the
opportunity to work on a project combining moon watching with radar and
flight calls. As Mike said, "Let's do it!"
in the meantime, I'll be
Good stuff, Andrew!
A few things:
1. "Ted's clips" of Brewer's Sparrows are actually Nathan Pieplow's.
2. Interesting to compare Andrew's observations in Catron County, NM,
with observations from "up north" in Colorado. Pretty convergent, on the
whole, I would say.
3. Andrew says "presumed"
As usual, I must second Ted's thoughts. Nasty is right about this
complex - Mike Lanzone and I recorded flight calls of Black-headed
Grosbeak, Western Tanager and Bullock's Oriole in Arizona in 2005, and
the variation was staggering. On subsequent (and previous actually)
trips to the SW, I
Hi Night Flight enthusiasts,
Jim Danzenbaker here from Battle Ground, Clark County, Washington which is
located about 20 miles north of Portland, Oregon,
I was glad to hear a flood of nocturnal migrants flying over my house in
Battle Ground, Clark County this morning. I estimated about 5 birds
Ug, one of those days: I realize I sent this reply directly to Eric
rather than the list.
-- Forwarded message --
From: Mike Powers
Date: Fri, Aug 21, 2009 at 11:33 AM
Subject: Re: [nfc-l] detection settings for raven pro?
To: e kent
Hi Eric (and everyone),
In the past, I have not used any detectors when going through my night
recordings at home (Etna, NY). I have collected my sound data from the
roof-top microphone (Evans-style, with a Knowles microphone element)
piped into my home computer running Raven Pro, recording a continuous
If you feel so inclined, please respond to the list as there's at least more
than one of us with many of these same questions. Thanks again.
On Fri, Aug 21, 2009 at 11:09 AM, Chris Tessaglia-Hymes wrote:
> Hi everyone,
> In the past, I have not used any detectors when going through my
I'm going to be very interested in other's responses to Chris' questions.
This is my third fall recording NFCs. For the last two I was doing
it at home, feeding the mic input to my home computer and recording
with Easy Hi-Q Recorder.
This year I added a second mic at a nature center.
There is much fodder for discussion here, but I'll need to keep this
brief - if I can, I'll reply at length to all the additional questions
that Chris posed in a previous email in this vein, but it probably
won't be until later in the weekend.
David, I am pleased to hear that you are
I will post some specifics when I am looking at the data, but we did run
comparisons between XBAT, Raven, and Tseep. Breifly, first step was to
benchmark Bill's software. Then we ran detectors in XBAT and Raven using 140
different setting to look at site based and detector based variables
I've been recording from my home in south Louisiana with set-ups like
Chris and David over the last few years. I've been using the oldbird
software (tseep, etc), but only get about 20% of the flight calls that
I would otherwise detect by ear (and visually on spectrographs). Not
No software we have worked with gets near 100%. I have toyed around
with templates that got 95% of the calls, and detectors can get ~90%,
but more commonly get in the 60-80% range. In Louisiana with the
insects it would be on the low end of this. Katydids and such are
So, the question is: can the unwanted cricket and katydid sounds be
removed from the audio channel at the time of sound acquisition,
real-time, such that their acoustic signatures are minimized or
eliminated altogether from the collected sound data prior to an
automatic detector batch process?
Aha! I did a little searching. It looks like it is possible to cancel
out the unwanted sounds, real-time. My first result was this, which
describes adaptive noise cancellation technology:
It's worth playing with... I would be worried about loosing thrushes
and other spp in 3-5kHz range in the mix though, but if it worked well
would solve a huge problem.
Sent from my iPhone
On Aug 21, 2009, at 10:09 PM, Chris Tessaglia-Hymes
Aha! I did a little searching. It
I think the idea with adaptive noise cancellation is this:
you have a dual microphone system. One channel is the primary channel
(collecting the target sounds). The second channel is the "noise
collection" channel. Through some mathematical algorithms, you subtract
the noise collected in the
Okay, last post for the night
The more I read about this, the more and more it sounds really cool.
So, you software and hardware engineer people out there - what do you
think? Can it work to better clean up night flight call data collection?
Heck, this could get you closer to that 90-95%
I'm not a sound engineer, but it seems like if you pick up any portion of
flight calls in the noise reference signal, you will end up removing or
reducing the flight calls in the resultant recording, which would be extremely
counterproductive. So you would need to obtain a good recording of
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