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Copyright © 2009-2011

Song Meter SM2BAT

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About This Document..........................................................

Overview ...............................................................................

SMX-US Microphone ..........................................................

Notes on Weatherproofing...............................................

Directionality and Frequency Response ..........................

Cables...............................................................................

Power Consumption ............................................................

Using SM2BAT to monitor Bats.........................................

Simple One-Channel Configuration ................................

Jumper Settings..........................................................

Schedule.....................................................................

Audio Settings............................................................

Stereo Ultrasonic Recording............................................

Mixed Ultrasonic and Acoustic Recording......................

Stereo Mixed Recordings...........................................

Scheduled Mixed Recordings .................................... 10

Post Processing ................................................................ 11

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Содержание SM2BAT

Страница 1: ...Song Meter SM2BAT 192kHz Stereo or 384kHz Mono Ultrasonic Recorders Wildlife Acoustics Inc www wildlifeacoustics com ...

Страница 2: ... rights reserved Wildlife Acoustics is registered in the U S Patent and Trademark Office Song Scope Song Meter SM1 SM2 SM2BAT SMX and WAC are trademarks of Wildlife Acoustics Inc All other trademarks are the property of their respective owners Patents pending ...

Страница 3: ...rectionality and Frequency Response 3 Cables 5 Power Consumption 5 Using SM2BAT to monitor Bats 6 Simple One Channel Configuration 6 Jumper Settings 6 Schedule 7 Audio Settings 7 Stereo Ultrasonic Recording 9 Mixed Ultrasonic and Acoustic Recording 9 Stereo Mixed Recordings 9 Scheduled Mixed Recordings 10 Post Processing 11 ...

Страница 4: ...figuring the analog high pass filters and gain settings Note that the SM2BAT audio signal is not routed through the third stage amplifier configured by the left and right gain parameters in the settings menu Therefore the gain is configurable only with the SM2 jumpers to 0 12 24 36 48 or 60dB and the third stage gain settings will have no effect For monitoring bats with the SMX US ultrasonic micro...

Страница 5: ...creen is almost transparent to ultrasound with a loss of only 2dB However the loss increases with frequency when wet and will effectively block ultrasound if it then freezes The membrane is also fragile The foam windscreen adds a layer of protection against insects rodents and birds who will tend to nibble on the windscreen instead of the membrane We strongly recommend operating the SMX US with th...

Страница 6: ...damage should weatherproofing fail Directionality and Frequency Response The SMX US is an omnidirectional microphone and is therefore ideally suited to unattended monitoring in which the precise direction of bat activity may not be known in advance The following graph illustrates the typical pick up pattern SMX US Directionality 100 90 80 70 60 50 40 30 20 10 0 0 15 30 45 60 75 90 105 120 135 150 ...

Страница 7: ... frequency response and noise floor of the SMX US microphone Some additional attenuation can be expected if the microphone windscreen is wet especially in higher frequencies SMX US Frequency Response 140 120 100 80 60 40 20 0 10 000 20 000 30 000 40 000 50 000 60 000 70 000 80 000 90 000 100 000 110 000 Hz dBV pa Sensitivity Noise Floor ...

Страница 8: ... flash cards variation in electronic components and other variables High quality Alkaline D cells can deliver about 14 000mAh capacity at 20 C With compression and triggers this translates to about 95 hours record time with 192kHz mono 70 hours record time with 192kHz stereo and 75 hours record time with 384kHz mono Longer deployments are possible with larger external batteries using the Song Mete...

Страница 9: ...at the field site You can also extend the microphone on a cable up to 100 meters away from the enclosure With one channel using compression and triggering you can get about 95 hours of record time at 192kHz or 75 hours at 384kHz out of the internal four D alkaline batteries over one week of night time monitoring In a typical night with bat activity and no rain or gusty wind you will need about 0 5...

Страница 10: ...he following advanced schedule 01 AT SSET 00 00 00 02 DO 03 RECORD 00 30 00 recommended for 384kHz or 03 RECORD 01 00 00 recommended for 192khz 04 GOTO LINE 03 00X 05 UNTSRIS 00 00 00 06 GOTO LINE 01 00X The schedule above will wait for sunset then record back to back one hour or half hour segments until sunrise the last segment will end early at sunrise and repeat daily You can modify this exampl...

Страница 11: ...kHz 24 16kHz This will filter out frequencies below 16kHz Higher or lower settings are available to suit your needs For example if you have low frequency bats echolocating near or below 16kHz you may consider using fs 16 for 192kHz and fs 32 for 384kHz for a 12kHz high pass filter Song Meter will measure the rolling average power spectrum in the frequency band above 16kHz in the above example for ...

Страница 12: ...h compression and triggering consume about 30 more power and will use twice as much flash storage as single channel recordings The triggers act independently so each channel is compressed efficiently Mixed Ultrasonic and Acoustic Recording The 192kHz stereo board permits two channels to simultaneously record conventional audio on one channel and ultrasonic activity on the other by using an SMX II ...

Страница 13: ...ity distribution SM2BAT 192 MIXED SCHED SET For example the following schedule would make ultrasonic recordings on the left channel at 192kHz at night and then a 24kHz recording on the right channel to record the dawn chorus for an hour after sunrise 01 SET192000xMONO L 02 AT SSET 00 00 00 03 DO 04 RECORD 01 00 00 05 GOTO LINE 04 00X 06 UNTSRIS 00 00 00 07 SET 24000xMONO R 08 RECORD 01 00 00 09 GO...

Страница 14: ...ections to satisfy the desired spacing in order to fit whatever monitoring protocol you may be used to For example if you are used to using Time Expansion detectors that only record for 5 seconds and then pause for 50 seconds while the time expansion buffer is recorded you could select a max duration of 5 seconds and a min spacing of 50 seconds to simulate this behavior By default all detections a...

Страница 15: ...ou can select Output ZCA to create zero crossing files instead of WAV files In this way the SM2 is like having a full spectrum recorder and a zero crossing recorder in one device The division ratio can be specified as well as the sensitivity The sensitivity is specified in dB relative to a full scale signal or can be set to zero for autoleveling ...

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