For our demo, we decoposed a E7 sharp 9 chord played on a guitar. An E7 sharp 9 chord consists of 5 notes: E, G#, B, D, and G (not necessarily in that order). Using our rudimentary filter that searches for peaks in amplitudes in the spectrogram, we found that we could split this guitar chord into its comprising 5 notes. On the left, you will find the spectrogram of the original chord. Notice the amplitudes of the harmonics, especially right after the chord is strummed.
Below that is the sound file of the chord.
Below that is the sound file of the chord.
e7sharp9.wav | |
File Size: | 470 kb |
File Type: | wav |
Below, we have the decomposed sound files of the 5 notes that comprise the E7 sharp 9 chord: E, G#, B, D, and G. The clearest note seems to be the G sharp and the most muddled note is the G. Because of the proximity of G and G sharp notes, the filter showed the worst performance with the G note: the G and G sharp note will both be heard in the last wav file below.
Regardless, the files below demonstrate that our chord has been completely decomposed using our filter. By combining the 5 wav files below, an accurate manifestation of the original E7 sharp 9 chord would be produced.
Note: The sound files below are very quiet; you may need to increase the volume to hear the files.
Regardless, the files below demonstrate that our chord has been completely decomposed using our filter. By combining the 5 wav files below, an accurate manifestation of the original E7 sharp 9 chord would be produced.
Note: The sound files below are very quiet; you may need to increase the volume to hear the files.
e7sharp9e.wav | |
File Size: | 469 kb |
File Type: | wav |
e7sharp9gsharp.wav | |
File Size: | 469 kb |
File Type: | wav |
e7sharp9b.wav | |
File Size: | 469 kb |
File Type: | wav |
e7sharp9d.wav | |
File Size: | 469 kb |
File Type: | wav |
e7sharp9g.wav | |
File Size: | 469 kb |
File Type: | wav |
Below is the combined sound files from above. You can hear that this combination is similar to the original sound file, but sounds a little distorted. This is because we have combined only certain strips of frequencies, not the whole spectrum. In other words, there is much less information in this new sound file than in the original.
Nevertheless, the demo is shown to work!
Nevertheless, the demo is shown to work!
e7sharp9reconstructed.wav | |
File Size: | 469 kb |
File Type: | wav |
SecondAry Demo: Slowing and Speeding up a Song
Below is a sound file of Homer Simpson. We will speed up the speaking by a factor of 2, and then slow the song down by a factor of 2.
thermo.wav | |
File Size: | 37 kb |
File Type: | wav |
Below is the sound file slowed by a factor of 2. It takes twice as long to run. It is slightly garbled, but the tone is the same and the basic understanding of the audio file is maintained. When this play speed setting is applied to a song, it could be very useful for someone seeking to learn that song faster.
thermoslow.wav | |
File Size: | 146 kb |
File Type: | wav |
Below is the quote twice as fast. The sound is still slightly garbled, but the pith of the signal is intact. Speeding up a song could be useful in learning to play a song at faster tempos and developing dexterity.
thermofast.wav | |
File Size: | 37 kb |
File Type: | wav |