SpectrumView vs Bat Detector

SPECTRUMVIEW Visualise, in real time, the frequencies that you can hear around you and even those you cannot with SpectrumView, your dynamic audio companion for iPhone, iPad, and iPod Touch. SpectrumView provides a high-quality, real-time spectrogram and spectrum analyser display, with a configurable sample rate and frequency resolution. You can use this application to measure the highest tones you can sing, obtain visual feedback of the frequencies in your speech, identify an annoying sound, calibrate musical instruments and all sorts of acoustic analysis. Here's what it can do for you: · Refresh Spectrogram. Allows users to refresh the spectrogram so that it clears the spectrogram that had already been displayed. · Change min and max scale. Allows users to set their own minimum and maximum scale value on the spectrogram and spectrum analyser view, in both linear and log scale. · Set Recording filename. Recording filenames are editable and the suffix can be set to have an incremental value or date/time. · Generate snapshot of the spectrum data from playback and live recordings. [IAP] · Access recordings and snapshots using the "Files" app. All the data can be easily accessible using the "Files" app that is available from iOS 11. · Web File Transfer. Allows you to access your files from another device using a web browser. [IAP] · Logarithmic scale. Allows you to set either linear or logarithmic frequency scales in the Spectrogram and Spectrum Analyser views. [IAP] · Peak hold. Allows you to freeze and hold the peaks of the frequency envelope (three holds in three distinct colours) in Spectrum Analyser mode. [IAP] · Save location. Never forget where a clip was recorded – uses the devices location services. · Auto lock disabled. During playback and recordings auto lock is disabled to prevent the device from automatically locking (if enabled), for uninterrupted recording/playback · Multiple selectable sample rates from 8,000 Hz to 48,000 Hz · High-frequency resolution with configurable signal analysis window lengths or Fast Fourier Transform (FFT) orders. · Sound intensity represented using a colour spectrum scale from -96 dBFS to 0 dBFS. · Frequency Pinch-to-Zoom. Allows you to zoom into the frequency space to look at a specific tone or frequency. [IAP] · Recording and Playback of Audio Files. Provides a fully functional audio recorder that allows you to record, pause and play back files in high-quality, uncompressed, wave format. · Tap Data Cursor. Allows taps on any part of the Spectrogram or Spectrum Analyser display to obtain the exact frequency in Hertz (Hz) and level in decibels (dB) at that point. · Musical Notes or Frequency Display on Tap. Selectable frequency or musical pitch notation to obtain the cent-accurate musical note e.g. A4 (22), when the display is tapped. · Live Spectrogram and Spectrum Analyser Views of Recorded Files. Files recorded can be played back and the Spectrogram and Spectrum Analyser modes can be used to review the audio. · Sharing Recorded Files by Email or iTunes File-sharing. · High Quality Screenshots. · *Improved* Soundcloud support. Audio files can be uploaded to or downloaded from Soundcloud as well as being able to post audio to Facebook. [IAP] · Playback from iTunes library. Files can now be analysed directly form the iTunes library. · *NEW* Import audio from videos in your device library. · Fullscreen mode. Hide the menu at the bottom of the screen to get even more of the screen dedicated to frequency analysis. · Selectable spectrogram colour scales. You can now select one of 7 colour scales for your spectrogram. · Selectable window functions. You can now see the window function options provided. · Apply gain. A maximum of 24dB gain can be applied to make ‘hard to see’ details easier to view. · Open In. Audio files can be directly opened in SpectrumView. View files sent by email directly in SpectrumView.

Simply connect an inexpensive ultrasonic USB microphone to your iPhone or iPad and open your ears up to the extraordinary world of bat acoustics.  Build a dedicated USB microphone for under £10 : https://shorturl.at/e2A3U - : or buy one pre-assembled and tested for about £65 that also operates as a standalone bat detector https://www.apodemus.eu/nl/Apodemus-Pipistrelle-Mini/00126 All European bats and most of the world's "microbats" navigate, hunt and communicate using ultrasonic sounds, too high-pitched for human hearing. Bat Detector reveals those sounds to human ears, and has two different methods to make ultrasonic bat sounds audible.  HETERODYNE BAT DETECTION WITHOUT MANUAL TUNING Firstly, Bat Detector supports the classic technique of heterodyne bat detection. Heterodyning is a simple process that operates in true real-time, demodulating the bat sounds with a carrier signal just like an old transistor radio. Most heterodyne bat detectors require you to manually tune into different species, but Bat Detector operates without any manual tuning, instead it tunes into the strongest bat signal it can hear. The heterodyne process then turns any bats sounds it hears into percussive cracks, pops and slaps, or in the specific case of leaf-nosed bats such as Horseshoe species, strange alien warbles. These are often thought of as "bat sounds" - they are not. They are sounds synthesised by bat detectors using bat sounds as a source - rhe harmonic content of heterodyned sounds is distorted and mangled, and these sounds bear literally no relationship to the sounds the bats actually made. However, operating in true real-time means that the rhythm of the bats calls is preserved, and heterodyned bat sounds - despite sounding nothing like bats - are diagnostic and distinctive, so heterodyning remains an invaluable tool for all bat workers and enthusiasts. EXPERIENCE TRUE BAT SOUNDS FOR THE FIRST TIME WITH 16x TIME EXPANSION Time Expansion was previously a very high-end, expensive option. Time Expansion in Bat Detector operates in quasi real-time, capturing small snippets of bat sound and playing them back at 1/16 speed. 16 is a number chosen for two good reasons. Firstly it brings the bat sounds down to an easy range for human hearing, the sounds generated by Bat Detector range from between 1kHz to just under 7kHz. 16x Time Expansion preserves the harmonic relationships between the bat sounds, so it is a MUSICAL transformation. The bat sounds are not only slowed down but are transposed down by exactly 4 octaves. This means if a bat calls a C#, you will hear a C#, but 4 octaves lower. You will be surprised how beautiful and musical bat sounds are when time-expanded. When used in conjunction with heterodyning, and with the accurate frequency read out on the display, bat species identification is made much easier and more reliable. FULL-SPECTRUM 384kHz RECORDINGS TRIGGERED BY BAT SOUNDS When "RECORD" is engaged Bat Detector will trigger a 5 second full-spectrum recording at 384kHz whenever it hears a bat, or at least something that it *thinks* sounds like a bat. These are not the recordings of the sounds you hear coming from the detector, but are the sounds going INTO the detector - the true ultrasonic sounds that the bats made, too high for humans to hear. You will need specialist software to examine these files after you export them from your device to a computer. DEMO MODE FOR EDUCATION AND TRAINING If you want to experience bat sounds during the daytime, in a classroom environment, or when there aren't any bats around, just turn on Demo Mode in the Bat Detector section of the settings App, and Bat Detector will loop through a collection of bat recordings from Wiltshire, England. Alternatively, if you have recordings of your own that you wish to use, create a folder called Demo in Files->Bat Detector and Bat Detector will use these in Demo mode rather than its built-in recordings.