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tips:recording_ultrasound [2023/08/29 14:25] – mrkvatips:recording_ultrasound [2023/08/31 16:27] (current) – mrkva
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-Ultrasound refers to sound waves with frequencies higher than the upper audible limit of human hearing. This means that we can't perceive them, but fortunately, some microphones can. Our LOM Uši and mikroUši microphones can capture a significant portion of the ultrasonic range above 20 kHz. With the assistance of open-source software like [[https://www.audacityteam.org|Audacity]] or commercial software such as Adobe Audition, you can easily convert ultrasound into the audible range and listen to it using your own basic human ears.+Ultrasound refers to sound waves with frequencies higher than the upper audible limit of human hearing. This means that we can't perceive them, but fortunately, some microphones can. Our (LOM) Uši, basicUcho and mikroUši microphones can capture a significant portion of the ultrasonic range above 20 kHz. With the assistance of open-source software like [[https://www.audacityteam.org|Audacity]] or commercial software such as Adobe Audition, you can easily convert ultrasound into the audible range and listen to it using your own basic human ears.
  
 To get started, you'll need a recorder capable of recording at a sample rate of 96 kHz or 192 kHz. The latter is preferred. The theoretical limit you can capture with a 96 kHz sample rate is half of that – 48 kHz. With a 192 kHz sample rate, you can record sounds up to 96 kHz. Keep in mind that this is a theoretical limit based on [[https://en.wikipedia.org/wiki/Nyquist–Shannon_sampling_theorem|the Nyquist-Shannon theorem]], and real-world performance can vary. To get started, you'll need a recorder capable of recording at a sample rate of 96 kHz or 192 kHz. The latter is preferred. The theoretical limit you can capture with a 96 kHz sample rate is half of that – 48 kHz. With a 192 kHz sample rate, you can record sounds up to 96 kHz. Keep in mind that this is a theoretical limit based on [[https://en.wikipedia.org/wiki/Nyquist–Shannon_sampling_theorem|the Nyquist-Shannon theorem]], and real-world performance can vary.
  
-Secondly, you'll require microphones capable of capturing ultrasonic content. LOM Uši, mikroUši, and basicUcho series microphones are suitable for recording ultrasonic sounds, and we encourage you to test them for this purpose. In terms of performance (signal-to-noise ratio at higher frequencies), mikroUši is the best, followed by Uši, and basicUcho series performs the least. However, all of them can capture common bat sounds without any issues.+Secondly, you'll require microphones capable of capturing ultrasonic content. LOM Uši, mikroUši, and basicUcho series microphones are suitable for recording ultrasonic sounds. In terms of performance (signal-to-noise ratio at higher frequencies), mikroUši series is the best, followed by Uši, and basicUcho series performs the least. However, all of them can capture common bat sounds without any issues.
  
 For your first subject, you can use a very basic ultrasonic generator – keys. By shaking a set of keys, you can generate bursts of ultrasound reaching almost 80 kilohertz! However, don't let the audible part of the sound fool you; there's a lot of content you simply can't hear. For your first subject, you can use a very basic ultrasonic generator – keys. By shaking a set of keys, you can generate bursts of ultrasound reaching almost 80 kilohertz! However, don't let the audible part of the sound fool you; there's a lot of content you simply can't hear.
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 {{:tips:mikrousi_bats_original.png?nolink&400|}} {{:tips:mikrousi_bats_sloweddown.png?nolink&400|}} {{:tips:mikrousi_bats_original.png?nolink&400|}} {{:tips:mikrousi_bats_sloweddown.png?nolink&400|}}
 +
 +===== Interesting links =====
 +  * [[https://www.wildmountainechoes.com/equipment/options-for-recording-ultrasounds/|Options for recording ultrasounds]] by Wild Mountain Echos
 +  * [[https://thomasrexbeverly.com/products/bat-echolocation|Bat echolocation sound effect library]] by Thomas Rex Beverly
 +