Raven

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Raven Example Sounds

Raven and Raven Lite provide example sounds as a way to help users start to visualize sounds. Example sounds are included with the full installers for each product. If you chose to download only the software and not the examples previously, then you can use one of the links below to download the examples. Raven Lite includes all of the examples from Raven, plus examples from additional sources described below.

Download Example Sounds for Raven and Raven Lite

In addition to these examples, users can download other sounds from the Internet. The Cornell Lab of Ornithology's Macaulay Library offers a site where users can download free bird sounds as well as sounds that are available for a price. Five of the sounds from that site are available as part of the Raven download. A description of each Raven example sound is provided below, along with the source of the recording.

Sources:

 

Source: Cornell Lab of Ornithology

Example sounds below are made available from two groups within the Cornell Lab of Ornithology, the Bioacoustics Research Program (BRP) and the Macaulay Library

2000Hz.aif – A tone played at 2000 Hz.

AfricanForestElephants.aif – Low frequency vocalizations made by African Forest Elephants, recorded by the Elephant Listening Project of the Bioacoustics Research Program. Play the sound at a rate of 2.0 in Raven Lite to hear some of the low frequencies played at a faster rate, allowing human ears to better hear them.

AfricanForestElephants.aif spectrogram view using the bone spectrogram color map.

 

BeardedSeal.aif – Recorded while members of BRP were studying and recording bowhead whales in Alaska.

BlackCappedVireo.aif – This endangered species is being studied and censused in Texas by BRP researcher Dr. Kurt Fristrup. This and other bird research is conducted in BRP.

A section of the BlackCappedVireo.aif spectrogram view using the copper spectrogram color map.

 

BlueWhale.aif – This sound file is over three minutes long and contains many low frequency sounds. Try playing at a rate of 10.0 in Raven Lite to better hear the low frequencies in a compressed timeframe.

BowheadWhaleSong.aif – Bowhead whales are one of the species of whales being studied by BRP director, Dr. Christopher Clark.

CanyonWren.wav

CassinsKingbird.wav

ChestnutSidedWarbler.aif

DownyWoodpeckerRattle.wav – One of the free bird recordings available from the Macaulay Library's free download site. Play the sound at full speed and then at a rate of 0.1 or 0.2 to really be able to hear each rise and fall of the "rattle."

DownyWoodpeckerRattle.wav spectrogram view using the cool spectrogram color map.

 

EscreechOwl.aif – an Eastern Screech Owl.

EveningGrosbeak.wav – One of the free bird recordings available from the Macaulay Library's free download site. Play the first part of the sound at full speed at then at a rate of 0.1 or 0.2. At slower speeds, you can hear the complexity of the vocalization that you can see when you zoom in on the spectrogram view.

EveningGrosbeak.wav spectrogram view using the grayscale spectrogram color map.

 

HumanVoice.aif – A three year-old girl spells the name of her favorite sound analysis software program.

LarkSparrow.aif

LarkSparrow-edit.aif – An edited version of the above file. See if you can edit LarkSparrow.aif to make it look like this file.

Noise.aif

NorthernFlickerFlickaCalls.wav – One of the free bird recordings available from the Macaulay Library's free download site. Look at the figures below to see how the sound looks different at different zoom levels. Play the "flicka" sounds back at a slower rate to better hear the rising pitch of these calls.

NorthernFlickerFlickaCalls.wav spectrogram view using the inverse grayscale spectrogram color map.

 

NorthernFlickerFlickaCalls.wav spectrogram view using the grayscale spectrogram color map.

 

PineSiskin.wav – One of the free bird recordings available from the Macaulay Library's free download site. Look at the figure below to see how complex the vocalization is at around the 23-second mark of the sound. Listen to the sound yourself at full speed and at a reduced rate to better understand what this bird is singing.

PineSiskin.wav spectrogram view using the standard gamma II spectrogram color map.

 

Raven.aif – Three caws in a row. Look at the spectrogram and see how similar it is to the spectrogram in the Raven Lite logo.

Raven.aif spectrogram view using the hot spectrogram color map.

 

RBnuthatch.wav– A red-breasted nuthatch.

ScrubJay.wav – One of the free bird recordings available from the Macaulay Library's free download site. Listen to the sound starting at 13 seconds in, and notice the complexity of the vocalization that is more obvious when played at a slower rate.

 

ScrubJay.wav spectrogram view using the hot spectrogram color map.

 

SpottedHyena.aif

 

Source: Dr. David R. Bach, California State University Northridge

Dr. Bach teaches an online Physics of Music which makes use of Raven to teach about sound and sound analysis. He agreed to share some of the class examples with Raven Lite users.

100HzSynthSqwave.aif – This is an electronically produced sound that is made by combining the amplitudes of 6 different oscillators making pure tones (sine waves) and having the frequencies, 100, 300, 500, 700, 900, 1100 Hz. As more tones are added the sound approaches a square wave. You can see the 11 little bumps in the waveform if you zoom in sufficiently in the time direction so that you can see the individual cycles in the RavenLite waveform view. This is a demonstration of one part of the Fourier Theorem, showing that complicated periodic sounds can be made up of pure tones added together. The Fourier theorem also is the basis of the reverse process, the breaking up of complicated sounds into their Fourier components, or harmonics.

1HzSquare.aif – Play this square wave and watch the cursor as it passes each rise and fall in pressure as shown in the waveform view. Note that there are two clicks per cycle. If you place your speaker close to a candle flame, and amplify the sound sufficiently, you will see the flame jump at each rise and fall in pressure. This shows that your ears respond to rapid variations in pressure and that the pressure can be either increasing or decreasing.

CatCup.aif – The sound is made by tapping the rim of a coffee mug, which happens to have picture of a cat on it, at different positions to show the modes of vibration of the cup. Try it, and measure the waveform decay and the spectrogram.

CelloC2.aif – Play the sound and notice in the spectrogram view the large number of harmonics that make up the rich cello sound at C2 (two octaves below middle C).

DarkToneBrightTone.aif – Here is a manufactured tone that demonstrates bright (with increasing intensity as the harmonic number increases) and dark (with decreasing intensity as the harmonic number increases) tones. Notice the effect in the spectrogram as you change the contrast.

Didjeridoo.2.aif – Observe the spectrum in this most interesting instrument which is a close relative of ours. The pitch (frequency) is determined by the players lips, and is not determined by the length of the tube. Our own voices behave in much the same way as the pitch depends on the speed of opening and closing of the vocal folds. In most other tubular instruments (flutes, clarinets, horns, etc.), the pitch is determined by the length of the tube.

DuckCall.aif – This is used to call ducks, but it is also used as a basis of manufactured voices. With the proper vocal cavity, the duckcall can make sounds which can mimic our vowel sounds. See and listen to
http://www.exploratorium.edu/exhibits/vocal_vowels/vocal_vowels.html.

eiaouatD5.aif – We distinguish our vocal sounds by emphasizing and limiting certain of the harmonics that occur naturally in our speech (See the spectrogram of your vowel sounds with RavenLite).

eiaouatC6.aif – At an octave above D5 (the last sound), it becomes very difficult for the singer to distinguish (or for us to hear) the difference between the vowels. If you watch the spectrogram, and increase the contrast, you may be able to see differences which we cannot really hear.

Pitchpipe.A440.aif – Although this is used for tuning instruments, you can see in the spectrogram that the sound contains many harmonics.

PrayerBell.aif – This is a small brass prayerbell and the waveform shows that the sound is decaying as time goes on. There is also ringing which you may be able to emphasize by filtering certain parts of the sound.

RubberGlove.vib.aif – This is an artifical sound made by stretching the palm of a thin rubber glove across the end of a bathroom tissue tube and fastening it with a rubber band. A small slit is cut in the end of the tube and the sound is made by blowing into the covered and and alternately squeezing and releasing the end of the tube to make a proper sound. In this experiment, the tube was moved in and out from the lips which produces the vibrato (wiggling in frequency) that you hear. You can see the vibrato changes in frequency (the wiggles) as you observe the spectrogram as the sound is made.

TuvaSounds.aif – This sound is a famous sound made by the Tuva people. As you watch the spectrogram, as time goes on, you notice that there is a low component (at low frequency) and a higher component that is truly separated as the sound turns into an “eee” sound. This is called two-tone singing, but the spectrogram shows us that the two tones are really just a separation of the low harmonics and the upper harmonics, which is overemphasizing what we do when we make the “eee” sound.
Vibratone.aif – This is an instrument that has a surface resonance (the metal tube) and also a volume resonance. This shows the decay in intensity of the sound.

ViolinVibratoG4.aif – This shows the heart of the beautiful sound of a violin when the player makes a vibrato. The spectrogram shows the variation in pitch, which may be correlated with variations in loudness which can be seen in the waveform graph.

ViolinC4mixed.aif – This sound is made by a violin playing D4, D#4, and both at the same time. You can see the beats in the waveform in the “both” part of the waveform that are made by the two tones that only differ by about 15 Hz (cycles per second). In order to make the numbers come out correct you have to filter out all of the sound except the fundamental (the lowest or first harmonic). The difference in frequency of the two notes gives the beat frequency of the combined note which you can measure using the time scale in the waveform graph.

ViolinCEG.aif – This shows the notes of the C major triad. Play the sound and notice in the spectrogram that many of the higher harmonics are matched in frequency, which makes this a pleasant sounding chord when you play them together (see below).

ViolinCEG4Chord.aif – Here is the Cmajor triad played together to how show the matching in frequencies sounds and looks!
ViolinG3.aif – Notice from the spectrogram that the lowest note, the fundamental, is not the loudest note from this violin played at G3.

VowelsFilteredFromNoise.aif – This sound starts out with an noise sound made electronically. It is then filtered, using the RavenLite frequency dependent filters, to make vowel sounds from the noise sound, much as our vocal cavities can act as filters. What do you think of the sound?

VowelsFilteredFromViolin.aif – Here we do the same thing as above but we filter a sound made by a group of eight violins playing together.