Category: DSP

RF mixer simulation in Max

Audio simulation of an RF circuit.

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The simulation serves no purpose, but its fun. There are 4 versions. I think the third one sounds best (rf-mixer-sim3.maxpat). Its interesting to hear how much spectral distortion happens from multiplying sawtooth waves.

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Download

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

folder: rf-mixer

patches:

Note: please set the signal vector size to 1 (or as low as possible) and enable overdrive and audio interrupt

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Four versions:

  • rf-mixer-sim.maxpat (initial attempt)
  • rf-mixer-sim2.maxpat (uses sah~ and rate~ objects)
  • rf-mixer-sim3.maxpat (uses gate~ objects with a phasor~ clock)
  • rf-mixer-sim4.maxpat (bandpass filter on RF input)

 

Using the NE602

“The NE602 could very well become the RF experimenter’s ‘555’ chip”

From “Electronics Now”, February 1997, by Joseph J. Carr 

http://schematicsforfree.com/archive/file/Radios%20&%20RF%20Circuitry/Misc/Using%20the%20NE602%20RF%20Chip.pdf

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Note: If you are searching for NE602, try the following variations:

  • NE602
  • NE612
  • SA602
  • SA612

As well as any of the above with the suffixes AN, or AD, for example: NE602AN

Regenerative shortwave radio experiment

Circuit design by Ray Ring

http://circuitsalad.com/2015/01/27/yet-another-variant-of-the-junk-box-regen-this-one-is-really-weird-but-is-an-excellent-performer/

The audio is playing through headphones here, so you can’t hear the excellent signal quality

I didn’t have the OpAmp called for in the circuit, so I built this audio amplifier designed by Dean Segovis: http://hackaweek.com/hacks/?p=131

The antenna was a piece of wire about 30 feet long.

An air variable capacitor was used for tuning.

More to come…

Basic synth in Max – part 2

Yet another Basic synthesizer design

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See part 1 here: http://reactivemusic.net/?p=18511

New features

Drag to select buffer start/end points

waveform~ object

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Sample recording

record~ object.

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How to design voice activated recording?

*Time compress/stretch

groove~ (Max 7 only)

Presets

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M4L preset management: http://reactivemusic.net/?p=18557

Polyphony

poly~ object

Polyphonic Midi synth in Max

http://reactivemusic.net/?p=11732

local: poly-generic-example1.maxpat (polyphonic)

Polyphonic instrument in Max for Live

Wave~ sample player: http://reactivemusic.net/?p=18354

local: m4l: poly-synth1.als (aaa-polysynth2.amxd)

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Max For Live

automation and UI design (review)

Distributing M4L devices

How to create a Live ‘Pack’

by Winksound

  • save set
  • collect all and save
  • file manager
    • manage project
      • packing : create live pack

 

Portrait series

Optical flow, a depth camera, and edge detection.

By Matt Romein

https://cycling74.com/project/gif-portraits/

Portrait+-+Margo+Cramer

Portrait of Margo Cramer from http://mattromein.squarespace.com/#/portrait-series/

The programming uses the following external code:

jit.gl.hap – Rob Ramirez
ab.hsflow.jxs – Andrew Benson
jit.openni – DiabloDale
cv.jit – Jean-Marc Pelletier