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Assignment 3

September 9, 2009

1. Musical Instrument: Cello

Listen: http://www.freesound.org/samplesViewSingle.php?id=48028

This sound came out very neatly in the spectrogram, since it’s just one long, stable note. Using linear bins, and zooming in vertically as much as possible, I could see clearly how all of the harmonics were evenly spaced, and where the fundamental is.

The spectrum for this was pretty easy to get–I used a window of 4096 and was able to see how the frequencies go from high to low within a given moment. It showed me again how smooth the cello sound is, too (compared to my other recordings)

CHo_cello spectrum

2. Sharp Attacks: Snapping

Listen: http://www.freesound.org/samplesViewSingle.php?id=349

This was hard to get a spectrum for, because the sound was so short, and even after I got an image for it, you can see that there’s still a good portion at the beginning that doesn’t tell you much.

Photobucket

The spectrogram was better, because I could at least see where each snap came in, and the amplitude of the snaps, as well as the amplitude of the shuffling between the snaps.

CHo_snap spectrogram

3. Inharmonic Sound: Tibetan Singing Bowl

Listen: http://www.freesound.org/samplesViewSingle.php?id=2166

This was a beautiful sound with a long ringing decay, and the harmonics and fundamental showed up very clearly in the spectrogram. I liked seeing the spectrogram of this, because I could see very well where the most harmonics were, and how long it took them to decay.

grill bowl,freesound spectrogram

The spectrum for this was cool too, because it shows the descending peaks of the frequencies at any given moment during the ringing, and how the lower frequencies stay mostly constant throughout.

CHo_bowl spectrum

4. Bird Call: Nightingale

Listen: http://www.freesound.org/samplesViewSingle.php?id=349

The spectrum for this one was interesting, because though it was a very short sound (like the snaps), it was much more melodic, and the frequencies were more constant than the snaps’ frequencies.

CHo_nightingale spectrum

The spectrogram was even cooler, because I got to see each call clearly, and it showed that the fundamentals and harmonics were pretty much constant throughout the short series of calls. This might be obvious from just listening to the sound clip, but it’s always interesting to see how many harmonies are in each sound, and how complicated such a simple-sounding call can actually be.

CHo_nightingale spectrogram

-Christina

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One Comment leave one →
  1. September 13, 2009 5:35 pm

    Very nice for the cello and the finger snapping. For the Singing Bowl there is really not fundamental frequency and thus no harmonics, they are inharmonic frequencies. We hear a pitch but this is a perceptual effect.

    The link for the Nightingale is wrong and the spectrogram does not really show the “melody” of the Nightingale.

    …xavier

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