Re: Simple spectrograms - an addition...
Hi all, To the already huge list of available software I'd like to add SeaWave, a simple, though powerful, real-time spectrogram software able to run on any windows pc. A PIII500 cpu is the minimum requirement to get real-time performances up to 48kHz sampling. It shows spectrograms in real-time or while playing back a wav file. It can also record to disk or make spectrograms without playback. Developed at CIBRA, it is downloadable for free at http://www.nauta-rcs.it/SEA/seawave_index.html Version 2.0 will be available soon. More advanced versions are also available. Special versions for educational programs are available for free. -- Gianni Pavan Email [EMAIL PROTECTED] Centro Interdisciplinare di Bioacustica e Ricerche Ambientali Universita' degli Studi di Pavia Via Taramelli 24, 27100 PAVIA, ITALIA Tel +39-0382-507874 Fax+39-02-700-32921 Web http://www.unipv.it/cibra
Re: anti-aliasing without filter?
Yes, it makes sense. Though, you must be sure nothing enters into your electroacoustic chain. Other than real sounds, you also have also to consider any electric interference coming from the environment in which you're working. Just as an example, while working on an oceanographic ship I needed to sample wideband hydrophones at 1 MHz to avoid aliasing due to heavy interference in the range 200 to 400 kHz. Then I filtered out unwanted frequencies by using software filters, and the final step was downsampling. Depending on the equipment you have and the context in which you're working, oversampling can be a solution to avoid the use of expensive analog filters (sharp filters at very high frequency are normally expensive!). An additional positive effect of oversampling is a reduction of quantization noise when using industrial boards with 12 or 14 bits of resolution. Gianni [EMAIL PROTECTED] -- Gianni Pavan Email [EMAIL PROTECTED] Centro Interdisciplinare di Bioacustica e Ricerche Ambientali Universita' degli Studi di Pavia Via Taramelli 24, 27100 PAVIA, ITALIA Tel+39-0382-507874 Fax+39-02-700-32921 Web http://www.unipv.it/cibra At 17.26 10/05/2004, you wrote: Does anyone can point out problems or disadvantages of using the frequency response of transducers and/or amplifiers (e.g. due to GBP limitations) to avoid aliasing? If for instance I use a transducer with a response that drops past 100 kHz and an amplifier with a similar frequency response, and I sample my signal at 500 kHz, I could avoid aliasing without having to use a low pass filter before the analog-to-digital stage. Does this makes sense? All the best, Ricardo Antunes
Re: Recording equipment for student
Edirol R1 is limited to 44.1 kHz sampling; the same limit applies to all minidisc (MD) recorders. Other cheap solid state recorders go up to 96 kHz sampling, but the frequency response in the upper range must be verified. MAudio MT2496 is okay for frequency range but a bit noisy (high output mics are required to overcome this problem) and with a poor phantom powering limited to 32 V (many mics work ok, others may not). To get at least 80 kHz bandwidth, you need 192 kHz sampling, which is available in a few portable recorders, but response is not necessarily extended as one might want: Sound Devices 722 (the response falls smoothly above 60 kHz, -6 dB at 80 kHz, -10 dB at 92 kHz) Fostex FR2 (flat up to 92 kHz) Tascam HDP2 (Joe Olson reported recently that its response falls down to -20 at 80 kHz) Another viable solution is to use a laptop with a suitable audio interface. To get 90 kHz bandwidth I could suggest the MOTU Traveler (4 mic in with P48, 4 line in, low noise, FireWire interface, external DC powering) that costs less than $1000. To learn more about frequency response and anti-aliasing features (that affect the usable bandwidth) of some recorders and audio interfaces visit our web page at http://www.unipv.it/cibra/res_techtest_uk.html Gianni [EMAIL PROTECTED] At 05.44 17/06/2006, you wrote: I am curious if anyone could recommend some field recording equipment, digital disc recorder, for an individual interested in bioacoustics? The Edirol R-1 model? I am looking for something affordable for a student, certainly less than $1000. A sampling rate allowing for recording of ultrasound is desirable. I have experience field recording with a minidisc recorder for non-scientific purposes, and I am getting ready to pursue some undergraduate research in bioacoustics. Thanks, David [EMAIL PROTECTED] -- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.1.394 / Virus Database: 268.9.0/366 - Release Date: 15/06/2006 -- Gianni Pavan Email [EMAIL PROTECTED] Centro Interdisciplinare di Bioacustica e Ricerche Ambientali Universita' degli Studi di Pavia Via Taramelli 24, 27100 PAVIA, ITALIA Tel +39-0382-987874 Fax+39-02-700-32921 Web http://www.unipv.it/cibra -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.1.394 / Virus Database: 268.9.2/370 - Release Date: 20/06/2006
new course on terrestrial and underwater bioacoustics
A new university course on terrestrial and underwater bioacoustics has been set at the University of Pavia, Italy. The course is part of the special degree in Science of Nature, it offers 4 credits, and it will be held in the 2nd semester, starting with the academic year 2006-2007. The course includes aspects of bioacoustics in all zoological classes with a special focus on marine mammal acoustics, acoustic ecology, acoustical oceanography, the impact of noise, sound recording and analysis, basic signal processing techniques, techniques and instruments (microphones, hydrophones, arrays, sonobuoys, GPS, tags, bottom recorders), and other topics. For information please visit the page http://www.unipv.it/cibra/edu_corso_ita.html (in Italian) or write me at [EMAIL PROTECTED] . -- Gianni Pavan Centro Interdisciplinare di Bioacustica e Ricerche Ambientali Universita' degli Studi di Pavia Via Taramelli 24, 27100 PAVIA, ITALIA Tel +39-0382-987874 Fax+39-02-700-32921 Web http://www.unipv.it/cibra Email [EMAIL PROTECTED], [EMAIL PROTECTED]
XXI IBAC Congress - Updated Program
the update program of the XXI IBAC Congress is now available here: http://www.unipv.it/cibra/Program_XXI_IBAC.html Gianni --- Gianni Pavan Centro Interdisciplinare di Bioacustica e Ricerche Ambientali Universita' degli Studi di Pavia, Via Taramelli 24, 27100 PAVIA, ITALIA Phone +39-0382-987874Fax +39-02-700-32921 Email [EMAIL PROTECTED], [EMAIL PROTECTED] Web http://www.unipv.it/cibra CIBRA organizes the XXI IBAC Congress, Pavia, 15-18 September 2007 http://www.unipv.it/cibra/xxi_ibac.html
Workshops on Detection, Classification, Localization and Density Estimation of Marine Mammals Using Passive Acoustics
. Scientific Committee Gianni Pavan (Univ. of Pavia, Italy), Walter Zimmer (NURC, Italy), David Moretti (NUWC, US), Bob Gisiner (MMC, US), Len Thomas (Univ St Andrews, Scotland; convenor of the DE workshop) and others Organizing Committee Gianni Pavan, CIBRA (DCL Workshop); Len Thomas, StAndrews (DE Workshop) Secretariat Workshops Secretariat (registration, payment, accomodation bookings) is managed by PRAGMA Congressi email mailto:[EMAIL PROTECTED][EMAIL PROTECTED] Gianni Pavan Presidente CIBRA Centro Interdisciplinare di Bioacustica e Ricerche Ambientali Dipartimento di Biologia Animale Universita' degli Studi di Pavia, Via Taramelli 24, 27100 PAVIA, ITALIA Phone +39-0382-987874Fax +39-02-700-32921 Email [EMAIL PROTECTED], [EMAIL PROTECTED] Web http://www.unipv.it/cibra
impact of noise on bats ?
hi all, lately I'm getting interested in the impact of noise on natural habitats. Effects of noise on birds and frogs are known. But what about bats ? Please let me know if you have any info or literature reference about the topic. Gianni --- Gianni Pavan Centro Interdisciplinare di Bioacustica e Ricerche Ambientali Universita' degli Studi di Pavia, Via Taramelli 24, 27100 PAVIA, ITALIA Phone +39-0382-987874Fax +39-02-700-32921 Email [EMAIL PROTECTED], [EMAIL PROTECTED] Web http://www.unipv.it/cibra
Re: 192 kHz USB sound cards
Hi, the E-MU Tracker Pre is a USB powered audio interface with 192kHz sampling. The frequency range is flat up to 90 kHz and the anti-aliasing filtering is pretty good. With high level signals exceeding 96 kHz (in the range 96 to 105 kHz) you can get aliased components in the range 96 to 87 kHz. Graphs will be shown soon on our website. This interface has only analog I/O. At max gain the mic inputs accept levels up to 18mVpp (measured between pins 2 and 3 of the XLR input). Gianni Pavan At 10.32 29/11/2008, you wrote: Hi, I have successfully tested the E-MU 0404 USB 2.0 Audio/MIDI Interface: http://www.emu.com/products/product.asp?category=610subcategory=611product=15185nav=features It's frequency response is flat up to 90 kHz. Unfortunately, it is not BUS-powered, which means that it requires an external power adapter. The frequency response and anti-aliasing characteristics of such audio interfaces are primarily determined by the A/D converter chips in them. The above unit employs the AK5385A chip, whose pass-band filter characteristics (at fs=192 kHz) can be found at page 10 of the data sheet: http://pdfdata.datasheetsite.com/pdf1/AKM/AK5385A.pdf. Regards, Raimund -- Raimund Specht Avisoft Bioacoustics Kirchstr. 11 13158 Berlin Germany tel +49 30 48476986 fax +49 30 48476987 mailto:raimund.spe...@avisoft.comraimund.spe...@avisoft.com www.avisoft.com -- - Original Message - From: mailto:d...@st-andrews.ac.ukDouglas Gillespie To: mailto:Bioacoustics-L@cornell.eduBioacoustics-L@cornell.edu Sent: Thursday, November 27, 2008 11:41 AM Subject: 192 kHz USB sound cards Hi all, Has anyone tested, or seen a believable spec for a USB sound card that will sample at 192kHz and will actually pass through data up to at least 80 kHz ? Many sound cards have a low pass filter at around 20kHz even though they sample at 192, which is a bit pointless. If anyone is interested, I've been using RME Fireface 800 and 400 cards a lot recently. These generally a very good frequency response to at least 90kHz. Unfortunately, my current application really requires me to use USB not firewire. People may also be interested to know that the clocks in the RME cards aren't great and they seem to sample about 0.5% slower than you ask them to (either the clocks run slow, or the Firewire interface is losing samples, I'm not sure). The consequences are that over an hour you can lose several seconds of recording, which is important if you're trying to accurately time events based on a file start time and the number of samples in a file. Best, Douglas. == Douglas Gillespie Sea Mammal Research Unit, Gatty Marine Laboratory, University of St. Andrews, Fife, KY16 8LB Scotland. The University of St Andrews is a charity registered in Scotland : No SC013532 Database dei virus interno non c aggiornato. Controllato da AVG - http://www.avg.com Versione: 8.0.175 / Database dei virus: 270.9.10/1813 - Data di rilascio: 26/11/2008 8.53 --- Gianni Pavan Centro Interdisciplinare di Bioacustica e Ricerche Ambientali Universita' degli Studi di Pavia, Via Taramelli 24, 27100 PAVIA, ITALIA Phone +39-0382-987874Fax +39-02-700-32921 Email gpa...@cibra.unipv.it, gianni.pa...@unipv.it Web http://www.unipv.it/cibra
Reminder: 4th DCL Workshop and 1st DE Workshop, University of Pavia, September 2009
Università degli Studi di Pavia, Dept. of Animal Biology Centro Interdisciplinare di Bioacustica e Ricerche Ambientali September 2009, 10 - 12 : 4th International Workshop on Detection, Classification and Localization of Marine Mammals using Passive Acoustics September 2009, 13 : Linked Workshop: 1st International Workshop on Density Estimation of Marine Mammals Using Passive Acoustics Registration and Abstract submission are now open. The workshops web page is available on the CIBRA website at http://www.unipv.it/cibra/DCLWorkshop2009.htmlhttp://www.unipv.it/cibra/DCLWorkshop2009.html A short presentation of the workshops can be downloaded here: http://www.unipv.it/cibra/DCLWorkshop2009.htmlhttp://www.unipv.it/cibra/Workshop2009.pdf For any additional information please write to gianni.pa...@unipv.it Deadlines Important Dates May 1, 2009: Registration and Abstract submission opening June 1: Deadline for abstract submission June 15: Notification of Acceptance June 22: Deadline for Registration, Payment and Accomodation Booking September 30: Deadline for presenting full papers for the Proceedings (details will be available soon) Program September 9: 17 PM, Registration opening and welcome buffet September 10 to 12: DCL Workshop September 12, afternoon: Technical discussion, Round Table and introduction to DE Workshop September 13: Density Estimation Workshop Scientific Committee Gianni Pavan (Univ. of Pavia, Italy); Walter Zimmer (NURC, Italy); David Moretti (NUWC, US); Bob Gisiner (MMC, US); John Potter (Acoustic Research Laboratory, Tropical Marine Science Institute, National University of Singapore); Olivier Adam (NAMC, Paris University, France); Len Thomas (Univ St Andrews, Scotland; convenor of the DE workshop). Organizing Committee Gianni Pavan, CIBRA (DCL Workshop); Len Thomas, StAndrews (DE Workshop) --- Gianni Pavan Presidente CIBRA Centro Interdisciplinare di Bioacustica e Ricerche Ambientali Dipartimento di Biologia Animale, Universita' degli Studi di Pavia Via Taramelli 24, 27100 PAVIA, ITALIA Phone +39-0382-987874Fax +39-02-700-32921 Email gpa...@cibra.unipv.it, gianni.pa...@unipv.it Web http://www.unipv.it/cibra http://mammiferimarini.unipv.it
DEADLINE 4th DCL Workshop and 1st DE Workshop, University of Pavia, September 2009
As we received some requests to accept abstracts later than the original deadline set on June 1st, the workshop committee agrees in extending the deadline to June 8th. September 2009, 10 - 12 : 4th International Workshop on Detection, Classification and Localization of Marine Mammals using Passive Acoustics September 2009, 13 : Linked Workshop: 1st International Workshop on Density Estimation of Marine Mammals Using Passive Acoustics The workshops web page is available on the CIBRA website at http://www.unipv.it/cibra/DCLWorkshop2009.htmlhttp://www.unipv.it/cibra/DCLWorkshop2009.html A short presentation of the workshops can be downloaded here: http://www.unipv.it/cibra/DCLWorkshop2009.htmlhttp://www.unipv.it/cibra/Workshop2009.pdf For any additional information please write to gianni.pa...@unipv.it Deadlines Important Dates May 1, 2009: Registration and Abstract submission opening June 8: Deadline for abstract submission June 15: Notification of Acceptance June 22: Deadline for Registration, Payment and Accomodation Booking September 30: Deadline for presenting full papers for the Proceedings Program September 9: 17 PM, Registration opening and welcome buffet September 10 to 12: DCL Workshop September 12, afternoon: Technical discussion, Round Table and introduction to DE Workshop September 13: Density Estimation Workshop Scientific Committee Gianni Pavan (Univ. of Pavia, Italy); Walter Zimmer (NURC, Italy); David Moretti (NUWC, US); Bob Gisiner (MMC, US); John Potter (Acoustic Research Laboratory, Tropical Marine Science Institute, National University of Singapore); Olivier Adam (NAMC, Paris University, France); Len Thomas (Univ St Andrews, Scotland; convenor of the DE workshop). Organizing Committee Gianni Pavan, CIBRA (DCL Workshop); Len Thomas, StAndrews (DE Workshop)
free software for real-time sound analysis
Hi all, I'm glad to say that SeaWave 2.0 real-time spectrogram and recorder software is now available for free download from our website: http://www.unipv.it/cibra/seawave.html Any feedback will be welcome! Please, don't confuse it with Seewave, the great R package developed by J.Sueur: http://rug.mnhn.fr/seewave/ Gianni Pavan -- Presidente Centro Interdisciplinare di Bioacustica e Ricerche Ambientali Dipartimento di Biologia Animale Universita' di Pavia Via Taramelli 24 - 27100 PAVIA http://www.unipv.it/cibra http://mammiferimarini.unipv.it Phone +39-0382-987874
new ultrasonic microphone with usb interface
Hi all, I would raise your attention on a new ultrasonic microphone with integrated 200kHz AD converter and USB interface. It can be connected to any PC with either Windows, OSX, or Linux, without any additional driver. If interested here is the link: http://www.dodotronic.com. Gianni Pavan -- Presidente Centro Interdisciplinare di Bioacustica e Ricerche Ambientali Dipartimento di Biologia Animale Universita' di Pavia Via Taramelli 24 - 27100 PAVIA http://www.unipv.it/cibra http://mammiferimarini.unipv.it Phone +39-0382-987874
EMU TrackerPre
Dear all, here some preliminary info on the performances of the EMU TrackerPre, a pretty cheap though reliable USB acquisition device able to run up to 192k with good performances. The frequency response at 192k is flat up to 84kHz and rolls down 1 dB at 90kHz and 6 dB at Nyquist (96kHz). The a-a filters are steeper than those of the USBPre2: INPUT at 0dBALIAS 100kHz-16dB at 92kHz 102kHz-25dB at 90kHz 104kHz-50dB at 88kHz 112kHzat 80kHz the aliasing components are not measurable More accurate tests and graphs will follow on on our website at http://www.unipv.it/cibra/res_techtest_uk.html Gianni -- Presidente Centro Interdisciplinare di Bioacustica e Ricerche Ambientali Dipartimento di Biologia Animale Universita' di Pavia Via Taramelli 24 - 27100 PAVIA http://www.unipv.it/cibra http://mammiferimarini.unipv.it Phone +39-0382-987874
searching the source of a figure
Dear all, I have a figure and I need to find the source to properly reference it in a paper. I hope someone of you can recognize this figure and point me to the original paper ! As an alternative, can you suggest another figure to show the effect of a parabolic reflector ? the link to the figure is : : https://www.dropbox.com/s/5s m25k5qhc3wycv/parabolic%20response.png?dl=0 thanks in advance Gianni -- Centro Interdisciplinare di Bioacustica e Ricerche Ambientali Dipartimento di Scienze della Terra e dell'Ambiente Universita' di Pavia Via Taramelli 24 - 27100 PAVIA - I http://www.unipv.it/cibra Phone +39-0382-987874 <+39%200382%20987874> Banca Dati Nazionale Spiaggiamenti Mammiferi Marini http://mammiferimarini.unipv.it Consiglio Scientifico International Society of Ecoacoustics http://sites.google.com/site/ecoacousticssociety
