Category: Max/MSP

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max-projects index

A collection of experiments using Max

Each project is in a separate folder. Several projects require additional external objects or dependencies. Get instructions by clicking links next to each project names below.

download

max-projects on Github: https://github.com/tkzic/max-projects

Runs in Max 6.1.7 on Mac OS 10.9

index

3/27/2015 – Note: the index is not current with the contents at github. To find information about a patch, search for the patch name – or github folder name – at this site.

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Prevent blocking in Max externals

In situations where external objects “block” bangs, for example with aka.shell,  you can encapsulate the block by inserting a delay object before the bang that triggers the external.

This way, everything above the delay will run immediately and only the objects after the delay will block.

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ep-4yy13 DSP – week 13

“I think its just the biggest conceptual art project uninentional or otherwise that anyone ever made. it puts Christo and those other guys to shame. Its planetary”

Roman Mars “Episode 97 – Numbers Stations” from 99% Invisible

Radio

  • Measuring the invisible
  • What is the difference between sound waves and radio waves?
  • What is an antenna?
  • Wave propagation is frequency dependent
  • Sunspots and magnetic fields http://spaceweather.com
  • Extreme frequencies, negative frequencies?

examples

Internet radio streams and recordings

Frequencies and modes
  • Macbook trackpad: Noise 5 mHz. (try holding radio near screen too)
  • Macbook AC adapter: Noise 600-1400 kHz. (~1000)
  • AC adapters, LED’s, Utility poles: 3.2 Khz
  • Arduino transmitter: AM 1330 kHz.
  • Laser light at 650nM
  • Wireless micorophone (Orange-brown): Wide FM 614.150 MHz. (R band)
  • Cordless phone: Narrow FM 926 mHz.
  • Cell phone: Digitally encrypted trunking FM 836 mHz.
  • Wifi: Digitally encoded PCM 2.4 gHz.
  • FM broadcast band: Wide FM 89.7 mHz (Raspberry Pi example 98.1 Mhz)
  • TV audio 600 mhz/660 mhz FMW
  • The sun http://www.ips.gov.au/Solar/3/4

Topics not covered

(due to snow and stuff)

Visualization

 

  • d3
  • processing
  • jitter
  • hardware control

Statistics

Miscellaneous

Assignment

Please send me a copies of your earlier compositions. Have a prototype ready to demonstrate or talk about for the next class.

 

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notes for Berklee EPD presentation 4/30/2014

Web Audio API

other projects:

tz – examples

Internet sensors project updates

https://reactivemusic.net/?p=5859

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Changing the phase of a waveform

From a Max/MSP tutorial: http://cycling74.com/docs/max5/tutorials/msp-tut/mspchapter04.html at Cycling 74

Changing the phase of a waveform

For the most part, the phase offset of an isolated audio wave doesn’t have a substantial effect perceptually. For example, a sine wave in the audio range sounds exactly like a cosine wave, even though there is a theoretical phase difference of a quarter cycle. For that reason, we have not been concerned with the rightmost phase inlet of cycle~ until now.

A sine wave offset by a quarter cycle is a cosine wave

However, there are some very useful reasons to control the phase offset of a wave. For example, by leaving the frequency of cycle~ at 0, and continuously increasing its phase offset, you can change its instantaneous value (just as if it had a positive frequency). The phase offset of a sinusoid is usually referred to in degrees (a full cycle is 360°) or radians (a full cycle is 2π radians). In the cycle~ object, phase is referred to in wave cycles; so an offset of π radians is 1/2 cycle, or 0.5. In other words, as the phase varies from 0 to 2π radians, it varies from 0 to 1 wave cycles. This way of describing the phase is handy since it allows us to use the common signal range from 0 to 1.

So, if we vary the phase offset of a stationary (0 Hz) cycle~ continuously from 0 to 1 over the course of one second, the resulting output is a cosine wave with a frequency of 1 Hz.

The resulting output is a cosine wave with a frequency of 1 Hz

Incidentally, this shows us how the phasor~ object got its name. It is ideally suited for continuously changing the phase of a cycle~ object, because it progresses repeatedly from 0 to 1. If a phasor~ is connected to the phase inlet of a 0 Hz cycle~, the frequency of the phasor~ will determine the rate at which the cycle~ object’s waveform is traversed, thus determining the effective frequency of thecycle~.

The effective frequency of the 0 Hz cycle~ is equal to the rate of the phasor~

The important point demonstrated by the tutorial patch, however, is that the phase inlet can be used to read through the 512 samples of cycle~ object’s waveform at any desired rate. (In fact, the contents of cycle~ can be scanned at will with any value in the range 0 to 1.) In this case, line~ is used to change the phase of cycle~ from .75 to 1.75 over the course of 10 seconds.

The result is one cycle of a sine wave. The sine wave is multiplied by a ‘depth’ factor to scale its amplitude up to 8. This sub-audio sine wave, varying slowly from 0 up to 8, down to -8 and back to 0, is added to the frequency of Oscillator B. This causes the frequency of Oscillator B to fluctuate very slowly between 1008 Hz and 992 Hz.

• Click on the message box in the lower-left part of the window, and notice how the beat frequency varies sinusoidally over the course of 10 seconds, from 0 Hz up to 8 Hz (as the frequency of Oscillator B approaches 1008 Hz), back to 0 Hz, back up to 8 Hz (as the frequency of Oscillator B approaches 992 Hz), and back to 0 Hz.