Hi,
to keep the code simple and fast, the beamformer is based on the
basic delay and sum methods with few options to adapt it to different
situations. The array geometry can't be changed: at present, the software
requires a linear array of equally spaced sensors. The aim of the system,
to be coupled to either hydrophone or microphone arrays, is to provide
beamforming capabilities up to 1/4 (maybe 1/5) of the sampling rate (sensor=
spacing should be set accordingly), to provide a time plot of energy
received on the beams, and to provide all audio beams at the same time (it=
will be possible to select beams for file recording or for listening to the=
m.
As is not finished yet, I can't give further details. Though, write me
privately if you wish to discuss a particular application or development.
Gianni
At 11.03 09/01/2003 -0800, you wrote:
>Hello Gianni,
>
>I am really interested in your beamformer. How many inputs do you use to
>create the array? Do you input custom geometry to the program or does the
>user create the array according to what the program expects. Does it work
>well? Right now there are very few commercially available beamformer base=
d
>technologies for audio and most are aimed at law enforcement, not high
>quality audio recording.
>
>--------------
>Scott Petersen
>Sound Designer
>Blizzard North
>--------------
>
>-----Original Message-----
>From: Gianni Pavan
>Sent: Tuesday, January 07, 2003 4:29 PM
>To: ; ;
>
>Subject: [Nature Recordists] 16/24 bits multichannel recorder
>
>
>Hi all,
> I just finished my 16/24 bits multichannel recorder written in
>Visual
>Basic by using the Microsoft APIs and waveformatex extensions. I still
>have to design the GUI and to implement additional fuctions I need for my
>research work on animal voices.
>
>The functions I'm developing are:
>- simple beamformer (the prototype already runs in real time)
>- automatic segmentation to avoid problems with files >2GB and automatic
>destination disk change
>- recording activation when a threshold is reachen on a given channel.
>- recording to file of selected channels or beams or both
>- recording to individual channel files (i.e. 8 inputs to 8 files) or to a
>single multichannel file
>
>The prototype works great (I tested it with a Midiman Delta 1010 - 8
>channels @ 96 kHz sampling - on a PIII 500MHz and on a P4 2GHz) and I'm no=
w
>willing to have from you some ideas for additional functions or display
>types to implement.
>Also, I'll like to hear your ideas about the possible uses of such a
>software...
>
>Gianni
>
>
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--------------------------------------------------------------
Gianni Pavan
Email
Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
Universita' degli Studi di Pavia
Via Taramelli 24, 27100 PAVIA, ITALIA
Tel/Fax +39-0382-525234 Laboratori
Tel/Fax +39-0382-526208 Segreteria
Web http://www.unipv.it/cibra
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