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automated audio recorders

To: "Brian R. Mitchell" <>
Subject: automated audio recorders
From: michele manghi <>
Date: Mon, 3 May 2010 09:40:16 +0200
Hello Bioacousticians,
following the summary by Brian Mitchell, written last August, about
automated recorders, I would like to update and later re-share a list
of possible options for automated audio recorders.
Several new recorders have been released in this past year, mainly
shaped as older dictaphones but with 96kHz/24bit sampling.
Yamaha and Olympus are among them, but not only. Many of them have
timered recording fuctions, some have evident limits in using memory
(for example SD are only used as secondary storage needing manual file
transfer, or stereo recording only is allowed).
I have in my hands a Yamaha Pocketrak W24 I will test in these weeks.
Both sound quality and menu flexibility will be considered. Possible
adaptation to my external programmable timer will also be considered.

Is there anybody else who is testing new portable recorders for
automated applications?

thanks and all the best
michele manghi
NAUTA ricerca e consulenza scientifica

On Tue, Aug 25, 2009 at 2:38 AM, Brian R. Mitchell
<> wrote:
> Hello Bioacoustics-L,
> I wrote last week to find out about options for automated data recorders.
> ÂHere's a copy of my original e-mail, followed by some observations and the
> responses I received:
> "I am working to set up a pilot project that aims to deploy audio equipment
> in remote locations to automatically record wildlife vocalizations. ÂThe
> recorders need to be as inexpensive as possible, weather proof, high storage
> capacity, battery operated, with programmable timing, and pretty small /
> inconspicuous. ÂThe recording quality needs to be sufficient for pattern
> recognition of species-specific vocalizations (frogs, crickets/katydids,
> birds). ÂWe'd like to be able to deploy these for up to two weeks at a time.
> ÂI'm aware of Cornell's "ARU"s, but it sounds like they are proprietary,
> pricey, and only available for lease. ÂI'm also aware of the Wildlife
> Acoustics Song Meter, which I think would fit the bill for my project. ÂI
> have not been able to find any alternatives to the Song Meter system.
> ÂHowever, my contracting office is claiming that there are "lots" of
> alternative vendors for similar systems. ÂIs anyone on this list aware of
> alternative systems available for purchase? ÂHas anyone had good or bad
> experiences with the Song Meter system or an alternative system?"
> Thanks to all of the people who responded to my question! ÂIt turns out that
> the Wildlife Acoustics system does currently seem to fill a somewhat unique
> niche; there do not seem to be other recorders available for a similar
> price, other than home-made systems (and part of the goal of the project I'm
> working on is to compare home-made systems to more professional equipment).
> ÂHowever, it seems that there are a number of groups actively developing
> recording systems, and this may change in the next few years. ÂHere are the
> responses that I received:
> 1) I have been occasionally helping and monitoring how Neil Boucher has been
> doing with his new approach (software and off-the-shelf hardware). It gives
> you another option to consider. They are using his system to find and
> monitor rare parrots in Australia. ÂWeb site:
> 2) There are not many recorders that offer programmable recording times.
> However, There are many digital audio recorders that utilize MP3 or WMA
> compressed formats and can achieve long deployments. We have used a lot of
> Zoom H2 recorders, which utilize SDHC flash cards for storage. The
> recorders are less than $200, and a 32 gb SDHC card cost around $100. The
> self noise on the internal microphones is about 25 dBA, which is decent. At
> a 64 kbps MP3 rate this unit will give you 46 days of continuous recording.
> These units provide higher quality recording options for other
> applications, including a 4 channel mode (with internal microphones). Data
> offload is USB 2.0. You will need to provide external power. The Zoom
> consumes 248 mA at 2.45 volts (through the internal battery connectors), or
> 76 mA at 9v through the external connector (pin negative on the
> connector!). If you want to go really inexpensive, some colleagues at Zion
> NP have used
> digital voice recorders to monitor for Mexican Spotted Owls (4gb, $25 ea,
> much lower audio quality, lower power consumption). There are other options
> between these extremes. There are several recorders that do scheduled
> recording from internal FM
> receivers and have external recording options, so a very small change to
> firmware might give you exactly what you need. The trick would be getting
> access to the development system, or perhaps implementing RockBox.
> 3) the Batcorder is a pretty new
> piece of equipment which should meet most of your criteria. However, it is
> especially designed and programmed to exclude all non-bat calls, which makes
> it also rather pricey. I'm not sure whether the guys would take out that
> functionality if you asked them.
> 4) AUSOMS-7, which stands for Automatic Underwater Sound Monitoring System)
> is available. I have heard AUSOMS-15 (15 days recording time) is on sale
> now.
> For details, contact Dr. Tomy Shinke at SIT Co.Ltd.
> 5) My academic adviser has created a couple generations of small
> programmable digital recorders for underwater (and terrestrial) use and they
> are very good for long term deployments. I'm not sure what your budget is,
> but they certainly will be capable of accomplishing everything you listed.
> Here's a link to his website
> 6) We make an acoustic logger, storage up to several 100 GB drives (the
> laptop size ones), fully programmable, sampling rates to 24 kHz, low power,
> low noise. They are used in underwater acoustics but could easily be set up
> for terrestrial work. They may be out of the price range but if someone was
> to order many we could get them commercially produced which would bring the
> price down. They sample (16 bit) rather than continually collect data as we
> write to flash card (power cheap) then when this is near full boot up the
> hard disk and write to this (power hungry). They are fully programmable
> (sample rates, schedules, etc) via any PC comms package (ie. hyperterminal).
> As an example on power 48 D sized alkaline batteries, 58 GB drive, gives us
> 10 months of recording at 6 kHz sample rate, 200 s every 15 minutes. The
> units are well proven. See for the loggers, although
> this is a little out of date. ÂIf there was interest we could look at
> getting them commercially made - we are a research group within a Uni, not a
> manufacturer.
> 7) Did you ever find out better systems that the WA Song Meter. I have used
> them and will be glad to help with problem. See for
> my acoustic observatory.

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