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Assignment 4: Describing Sound

September 15, 2009

1) Speech:

Here’s the link to a man saying “not really funny” from a Dutch text fragment.

http://www.freesound.org/samplesViewSingle.php?id=254

When looking at this clip, it is not surprising that there is a large amount of variance in the levels of loudness, pitch and brightness because human vocal tracks are very adept at using all three qualities of the sound to manipulate and create new sounds within the body. As a result, all the graphs of this clip are all over the place.

-Loudness

Speech Loudness

– Pitch DetectionSpeech Pitch Detection

-Brightness
Speech Brightness

2) Harmonic Sound

In this part of the assignment, I was able to find a good clip of a pair of cellos playing a couple chords. Here we are able to see the relatively stable level of loudness and brightness, and then two distinct frequencies of the notes in the chord (approximately 145 Hz and 165Hz). The differences between the two samples and their respective graphs come from the fact that this latter clip is of two stable notes versus the human voice’s immense range in everyday speech.

http://www.freesound.org/samplesViewSingle.php?id=39665

-Loudness

Cello Brightness

-Pitch Detection

Cello Pitch Detection
-Brightness

Cello Brightness

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One Comment leave one →
  1. September 15, 2009 2:28 pm

    The plots of the speech sound are not well identified. The first is pitch, the second brightness and the third loudness. The pitch is not too good, maybe narrowing down the range would get better results, but maybe the pluging cannot do much better.

    For the cello the brightness and loudness are really good. The pitch is amazing what it does given that is not a single note, thus it does not have a single pitch. But it finds the fundamental of the chord, except in some places.

    …xavier

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