kdarr@andrew.cmu.edu – 18-090 https://courses.ideate.cmu.edu/18-090/f2017 Twisted Signals Thu, 07 Dec 2017 05:03:31 +0000 en-US hourly 1 https://wordpress.org/?v=4.8.24 https://i1.wp.com/courses.ideate.cmu.edu/18-090/f2017/wp-content/uploads/2016/08/cropped-Screen-Shot-2016-03-29-at-3.48.29-PM-1.png?fit=32%2C32&ssl=1 kdarr@andrew.cmu.edu – 18-090 https://courses.ideate.cmu.edu/18-090/f2017 32 32 115419400 Project 2 – Kevin Darr https://courses.ideate.cmu.edu/18-090/f2017/2017/12/03/project-2-kevin-darr/ Mon, 04 Dec 2017 04:53:25 +0000 https://courses.ideate.cmu.edu/18-090/f2017/?p=1508 For this project, I used spectral analysis along with machine learning to create a system for chord recognition. The system works by writing FFT frequency bin amplitudes into a matrix, then taking “snapshots” of the matrix and outputting the snapshot as a list, then sending these lists to the ml.svm object for categorization. While the system could easily work with any audio source, for this demonstration I made a simple polyphonic synth using sawtooth oscillators and a MIDI controller to play chords for the system to analyze. The challenge with this project was devising a system for processing the data from the FFT matrix and molding it into a form that is usable by the SVM but still contains enough data to identify specific chord spectra. The algorithm is powerful enough to recognize, for example, the difference between a C major chord and a C minor chord, if given enough training data.

In this demonstration I show how to train the SVM and how to map new chords. At the end I show that the system is not aware that a chord played an octave higher is not recognized. This can be fixed easily by simply mapping one chord played in several octaves (for example play C major chords with roots C3, C4, and C5 as state 1, D3 D4 D5 state 2, etc.)

main patch

<pre><code> ———-begin_max5_patcher———- 4889.3oc6cs0iiiak94p+UHXrOjfTsg3McIOMK17ZP.RxKKlJnfrMKWZZYIG I45xDj929RxCkrjsjLkLkqZmzC5wk0UdNe7bijmC8+5K2sXU1a7hEN+Qme14 t69We4t6TmRdh6zGe2hcQusNIpPcaKVmsaGOsbw8v0J4uUpN+NdYdlSY11sI 7GRqtbQ46Ib00qNS5gcwoI7R0aCoO49nx0OGmt8wb95RfZ78CV5duiWn7SDy U9Gr3Sm+Q0yjyKDDRTYbVZy2U7FU6ks5W9pePiVM6PYUy51wqnQSSXzkLQqQ oxFMfcrokO1+9KeQ9w8WId82OTlkGGk7GeHEszYcBOJ2o7YtSwK6t2YWz2De 6Pt5Pm3Bm3Tmx7Hwm6x1HfW7RmmyR13jk6TvSDDty5myx27PJYoingi2Jt8m izmUzo3D4THXStyp2EMU75uIvZUqEseed1dAcHu1gxxrTmrT0Uxi1DmsMO6v 9GRoKgmR28JegkGxU2ppaOMaG240miW+rfbR2THZtjn7sbGAruhm6j8jSwdA UleXmSQzt8I7B06.X2GRYK0uumd53K7gTukBpNauhUkDrhaV9Pp+Rmb9dtf+ ve0SvuB3J8cmx3chWq3nM7h3b9Fme2g8xVwWxza3OEcHo7dmhXQy+tSzlMBn LWylZVuv4IAfpNsBsJ98OjFTy5R3+gzPAM8ZrPZU9p2EsW2gfbWdNjHNsnqc eRz6.oKntzMNuJk0cDv9pnUwIwku6TjDugmW7f30+2hdQxox66uxWGkjHORH l9Rb1AAmEUFIjW9Koq4UfmyyBNdEmqkO3atWSuEQuT0mrNmK4FQuxR4aP81E eWR4INOEK6PUBKQoh2jS1dt30HYubEEnZI0KWRKxWvRm+GUSHuS0Ib9CNvKS 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poly-saw

<pre><code> ———-begin_max5_patcher———- 623.3ocuVE1iiBBD8y1eEF93EOOPwV89qb4RCUY2k8TvnX21rY6u8CGz1au0 Zqo11Dkxvfu48XXf2W3f1n1wqQt+z8WtNNuuvwAL0ZvoquCpfsKMmUCtgj72 TadE4YGRy2oAy5WD0kp78G5GoVuOmCC0aQ0ny4Z89RtEOjPpQd1F2e24jroP HMtAfQ5LVxzouHjOuthmpsSllP7CM+HgdtgAQ9XO2n312AA93ieMQFDAl.96 j.zIHrgBfQPqwOVrn8k2soArr5pCtDLFdv9qbCvSPNpEOKY4sJxo+AOCKNQi HNXqTPgFR.cTggLrvPmOg4GlXXk+DjhmxUrykTDbQdSRV01PIiQ63gYMY9X8 2NXxAl95+jYMIJokngwAPyxwXM8ty5Bs5oIP5ouyuitcKxgilaGd2oairjk9 GWy18GTgud5GBzOYzb76eIOgzk7PVsw.QCwiVI6Lq18wGaKOaswQyGeMSqqD aZz1C+bNxZGT6HqSUEEbokiHX.PulIUyDbGFS2ln3Pi.YgN5VgkCKN34iU0r 2N73J2EjXK2kLFoit79eXZnbg7+uFD.cq8OqD0plpzdNzcPh6Ivy30ZgjoEJ 4+3S6YrsNMnXes.EcE.QmAbnWANKmAbBuBbhlAbLUAcIW.m3YBmKwmvY.m9j oKlHbhzEhrRk43ltTbJYkeT6UErWWJN5XuiyPUkwqN+YkyZrR9rxMbvFj.k2 hvX+3t68Cl9ZDiu8HN3Ji3aCoqPZ9JN15Urxxs7p5NmAHL0neUABvJOnqPZ6 FBcq3aE89SAKrJSoUsotZSksT8tk1qGhJTFoT1H5V+MH+wh+BTMjzLF ———–end_max5_patcher———– </code></pre>

writetomatrix3

<pre><code> ———-begin_max5_patcher———- 1098.3oc2XkriiaCD8r8WgfNNvwgE2UNNyg4z7ADDDLfsLsi5HKZHI2KYv3u 8vEIaK2dQtsbCj3CRTjrXUuGqM3eLdT7ClWzUwQ+VzeDMZzOFOZjeJ2DiZ9d T7R0Ko4pJ+1hKzOad3w3Igkp0uT6md975rh4lMsKTU+Zt1uxL8b05751ELqq y000utRGzZbVgcsi8J5OaDoX8xrBqPdC.ZlbkpN8uxJV78RcZc3nv.dJZRD. tmhD2SrclsmS1LuAYM+egPi2c3ASxe5T2j+b7X2iI2Fi7oMQ32xFmjFpxVTn xOAnwmFz.Hc.kfX9W3ygZ9wAMLnfFPebnFindTe16Z1cG0UOM2dYiPuCjO4r iNNuPtLuv3tWbx43E.e+iAhPSYWAoLO2npuduALy61yCg.ryAZL5t6M7qa9H B.3vT1jnj.XSbiO48r3+IPN3a2KHe+yz8XV8zUl+VuIpJUkqifnqI5+8mmm4 gOf3myKmd2geppr1rxju4VR48dIAfFh2wmyG3DY2vCGG364wVv65644pS4CW 1wPzC+B33bBYONwKVbdVwgsE5Usa9tDUkYcYZKtZZxHZmxmoqrjjpNyTr2dn g8bzqh9pGVOziqD2MqHWuhQ3KnIWckaVSsGx4wjMctMaS6lLkyzktkQe.ple bUC2lp6glYC.65ItKoHb.g2lh38TQ2Lh5C0wGBE0iH.5Pvbc7uNi++P.nd4s 2UQgjipUqdRWV0rauNr0Kdz3iEDS7elUD9z2qdbo9or18S8ynJs4wqsIwWWF JY7BOTzNdowFUUrNqIvxhtwMkVNHgbgZYPzku5W1FCCLjDwUgr7aqB0gJdXQ pIOXa1ZGthEnoI1eBZ6nDXhagsriJMUWTumT1sInRjbRXjPjzNJg0UTctd4g xRDboWWjDIGDtQTNHIzthN2TT2hP6Ex2LEpTytpiOrXdVd91CdzV.ZqO2TmM dQoZVltnsL7n3N1ANAAIbugfRjnfI4lpK7ajB1iv573f8gaOdIGKnL2gJEHl TFFIojCOdUwhPWCXAxdlMytpz1cUYqGoir1t+00lsHqMuevMw6pa47TmbcIc PvodtlynIHb3ByN0A20tda7B98rBmOtt8.79IsO7RLdmVsgckVq4vV.iWZ89 xZsw8CS255F5r5y4q0s8lbbu1i3CdQHMjFXo44hq1B2YWLA1NdRv6+tXge4U 00afHbBi5CADBBA6ISIF.fL7F3WK052gE5YOh6maDvcgUCuw8M0Bq3pq17jT Dm6sLDGYMNOUxSfs4AGPa72044lmudSDyBIYERPBdSkYu0YuMaaU1+zDt69e TYIHjbf.vyK8klXXT+KMYClk3DJIDVKYLQXDFC3KVeRx.jObSRw3PfmjfPT7 kKOIjnDvWLPhPXHj21l01c49ej5SWnf9apTADABBw9BNIfcPZY+6akpNn0pO oOUIVJgFvx.B4ir9jUleN9eQEnrJf ———–end_max5_patcher———– </code></pre>

.data and .model example files.

 

chordsCmajor.data

chordsCmajor.model

]]> 1508 Project 1 – Kevin Darr https://courses.ideate.cmu.edu/18-090/f2017/2017/10/30/project-1-kevin-darr/ Mon, 30 Oct 2017 17:54:21 +0000 https://courses.ideate.cmu.edu/18-090/f2017/?p=1429 I decided to make use of the MIDI Fighter 3D midi controller with built in accelerometer to control the lighting system in the Media Lab. The Fighter is being utilized as a drum machine which has kick, snare, hi-hats, crash, and a series of bass notes. The accelerometer channels control the lights as well as some digital effects on the drum machine, including distortion and reverb. When sent MIDI notes on the correct channel, the MIDI Fighter lights up on the appropriate button with color dependent on the velocity of the note. I used Ableton Live to send these MIDI messages, as well as play the samples for the drum machine. To get control and MIDI messages into Max, I used ctlin and notein objects. When tilted left or right, the MIDI Fighter as well as the overhead lights turn red based on how far the device is tilted. The same is true for forwards and backwards, but blue instead of red. The snare drum triggers a flash from the UV LEDs, and the bass notes trigger a green flash.

 

I had trouble screen capturing audio and video at the same time, so here is a short audio example of a drumbeat I played on the MIDI Fighter.

 

And here is a video of what the patch looks like, with added pwindows to imagine howthe lights in the media lab would react.

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]]> 1429 Assignment 4 – Kevin Darr https://courses.ideate.cmu.edu/18-090/f2017/2017/10/15/assignment-4-kevin-darr/ Mon, 16 Oct 2017 03:55:41 +0000 https://courses.ideate.cmu.edu/18-090/f2017/?p=1306 For this assignment, I created my take on a spectrum visualizer using jit.poke~. The visualizer works by doing spectral analysis on a number of different audio samples and writes the data into either the red, green, or blue channel of a matrix corresponding to the frequency bins. The result is the visualization of 3 audio signals simultaneously. I added a rudimentary spectral degrader to demonstrate how different effects are displayed on the visualizer. The audio used in the examples are short loops that I wrote. (My favorite is the 8-bit lead synth on the blue channel due to the pitch bending.)

 

main

<pre><code>
———-begin_max5_patcher———-
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———–end_max5_patcher———–
</code></pre>

spectral-degrade

<pre><code>
———-begin_max5_patcher———-
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———–end_max5_patcher———–
</code></pre>

analysis-rgb

<pre><code>
———-begin_max5_patcher———-
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Hxm8T6Cs7+Sqx78oGyzj9PyK+GLbpWOJ
———–end_max5_patcher———–
</code></pre>

]]> 1306 Project 1 Proposal – Kevin Darr https://courses.ideate.cmu.edu/18-090/f2017/2017/10/01/project-1-proposal-kevin-darr/ Mon, 02 Oct 2017 02:43:21 +0000 https://courses.ideate.cmu.edu/18-090/f2017/?p=1053 I would like to make a project involving the use of a MIDI Fighter 3D to control lights in the media lab as well trigger samples. This project is inspired by the work of Shawn Wasabi, an electronic artist and performer known for his work with MIDI Fighter controllers. Here is a link to one of his works using the MIDI Fighter 64.

 

]]> 1053 Assignment 3 – Kevin Darr https://courses.ideate.cmu.edu/18-090/f2017/2017/10/01/assignment-3-kevindarr/ Mon, 02 Oct 2017 02:20:27 +0000 https://courses.ideate.cmu.edu/18-090/f2017/?p=1031 I decided to write a short drum+synth loop in Ableton Live to use as the original audio to be convolved. Here is the loop (2 iterations).

To get my impulse responses, I traveled into Schenley Park. This impulse was recorded on the trail underneath Panther Hollow Road.

Here is what the original sounds like under the bridge:

 

The next impulse was recorded near Panther Hollow Lake. Notice the background insect/bird noises.

Here is the original played next to the lake:

 

For this “impulse” I recorded the sound of the stream that flows into the lake.

The convolution (my favorite of all the convolutions):

 

Finally I attempted to convolve the original with the sound of wind, but I didn’t feel like finding a good sample. So instead I put the original recording as the IR and convolved them. Here is the audio:

 

(Shout out to my trusty assistant Ben for being the balloon popper.)

]]> 1031 Assignment 2 – Kevin Darr https://courses.ideate.cmu.edu/18-090/f2017/2017/09/17/assignment-2-kevin-darr/ Mon, 18 Sep 2017 02:24:56 +0000 https://courses.ideate.cmu.edu/18-090/f2017/?p=850 As in the in class demonstration of timeshifting with video using jitter, I created a simple video delay without feedback using a webcam. However, each color in ARGB has its own delay controls, creating an effect where each layer of color echoes differently. I was unsatisfied with how “regular” the echoes appeared, so I added the ability to dynamically change the delay time of each channel independently by using the microphone. As the received amplitude increases, so does the delay time. These abrupt changes to the delay time create some stuttering to the echoes, which allow the user to create trippy music videos on the fly.

Here is a video of me messing with the patch while Bassnectar serenades me.

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]]> 850 Assignment 1 – Kevin Darr https://courses.ideate.cmu.edu/18-090/f2017/2017/09/05/assignment-1-kevin-darr/ Wed, 06 Sep 2017 01:37:14 +0000 https://courses.ideate.cmu.edu/18-090/f2017/?p=729 For this assignment I took inspiration from the example of I am sitting in a room by Alvin Lucier by iteratively re-recording audio. The readymade system I used was Ableton Live. I took a default drum loop, recorded the audio using my computer speakers and a condenser mic, then applied a built-in audio effect called Redux which is essentially a bitcrusher/downsampler. I did this 11 times (including the original loop). It became somewhat painful to listen to since certain high frequencies were being amplified each pass.

An interesting and unintended side effect of the setup I used was the latency of the system. Each recorded section is exactly 3 measures at 70 BPM, but as you can hear the recordings become increasingly late and eventually cut off the end of the original loop.

Here is a link to the piece.

WARNING: As you can see in the Soundcloud waveform view, it gets very loud at the end. Please avoid damaging your ears/audio equipment.

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