DIY SASS-Lite

Building a SASS (Stereo Ambient Sampling System) using Primo EM172 capsules

Up to now we used a Rode NT4 microphone in a Rycote blimp for stereo field recordings. Since we still had some Primo EM172 microphone capsules lying around we had the idea to build a SASS system.

We found an excellent describtion of how to build it on Vicki Powys’ website  caperteebirder.com

We took the measurements and the concept of wiring two EM172 capsules in parallel from her post here: Vicki Powys’ SASS-Lite Narrow

To operate the SASS via XLR cables with 48V phantom power on our Sound Devices 702 we found a manual on the website of Tom Benedict.

Although our implementation of the construction is somewhat unclean due to lack of time and material we are very satisfied with the result. The SASS provides a good stereo image, the mics are very sensive and low noise.

Here are some images of the building process and 2 recordings using the SASS and a SD702 recorder. More investigations will follow.

3d printed plate for each pair of the EM172 capsules:

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XLR connectors each with a capacitor and resistor like in Tom Benedict’s post:

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view from the back:

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the plate glued to closed cell foam:

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closed cell foam and open cell foam connected and hold together by a metal plate:

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purple colored dead cat – the only thing we could get:

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A.O.S.C.-StreamingBox

 

A.O.S.C. StreamingBox
photo: blackhole-factory

This is the heart of the Agents: a RaspberryPi, a Cirrus Logic Audio Card and a POE Splitter in a waterproofed box. The RPi is running a PureData patch for analysing the signal from the microphone. For the analysis we are using the [melSpec~] object from the timbreID library from William Brent.

The Agents are configured in a way that we can remote control them as soon as they are connected to the internet at the remote places.

A.O.S.C. StreamingBox
photo: blackhole-factory

A.O.S.C.-Mic

We are working on a new project called A.O.S.C. – agents of synchronicity. More about the project soon. But for the start here is the description of the building process of a microphone for that project.

We need a simple mono microphone for long time outdoor usage at a fixed place. We decided to use the Primo EM172-Z1 electret capsule because it is not too expensive and the sound quality is quit good. We bought it directly from Primo in Germany.

Primo EM172-Z1

Using some heat shrink tube,

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a piece of a pipe for electrical installations from a hardware store and some Sugru to fix the capsule inside:

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A 3d printed ring and rubber hair bands as shock mount. For wind protection we have attached a piece of foam and a Rode fur for Lavalier mics onto the capsule

AoscMic03 Photo: blackhole-factory[/caption]

The house for the mic is a filter of a pump for a garden pond from the hardware store which is then covered by nylon socks..

AoscMic04
Photo: blackhole-factory
AoscMic05
Photo: blackhole-factory

The RainProtector

AoscMic06
Photo: blackhole-factory

Ready to go outside:
A.O.S.C. Photo: blackhole-factory

Physics150227

Trying out some OpenGL and physics in Max. It is based on the NurbsSheet patch from the Physics-Patch-a-Day thread in the cycling74 forum.
In this test the movement of the 3d object is generated randomly. It will later be connected to the hands and feet of a dancer tracked by a kinect.
The sound is generated by using an induction coil which is moved over different parts of the laptop and then live processed using Max/MSP. The result is sent to a second laptop to influence the visuals.

Watch on Vimeo:

TiG – Rhythmusmaschine

The TiG – Rhythmusmaschine is an interactive installation for the theater performance ‘Der Grosse Kreis’, a performance related on ‘The Rite Of Spring’ by Igor Stravinsky.
(More informations about the project on the TiG website)

The TiG – Rhythmusmaschine is a 4 track sequencer with an user interface projected on the stage floor. The sounds can be changed via live sampling by the performers using a sensor box and a set of percussion instruments. The performers are creating rhythms by placing white styrofoam balls in the projected field or dancing in the projection.

This video shows first tests with the installation:

And this is how the whole performance looked at the end:

The whole project is realized in Max:
A sensor box on stage with 4 ir sensors and an arduino board is connected to Max via xBee radio modules. It is controlling the live sampling and some stage lights as signs for the percussionist.
Max is also used to play the triggered sounds, for the camera tracking and the projection on the floor. The light design for the whole performance is also controlled using Max.

TiG: 'Der Grosse Kreis'
Photo: Klaus G. Kohn

TiG: 'Der Grosse Kreis'
Photo: TiG

TiG: 'Der Grosse Kreis'
Photo: TiG

TiG: 'Der Grosse Kreis'
Photo: TiG

prototyping new machine: the Scan Table

Photo: blackhole-factory

We are prototyping a new machine. The Scan Table is a computer controlled ‘turntable’ equipped with a Fire-I cam + a USB-microscope. A stepper motor is controlled by a max patch using an arduino board and a stepper driver to scan small objects. The images are live processed by a jitter patch and projected. The same objects are also used to create live processed sound by a max/msp patch. All three patches (for motor control, video and sound are exchanging control data and influencing each other creating an unstable situation.

The first public usage of this beast will be in the project ‘Die Situation ist unter Kontrolle’ at Kunstmühle this weekend Nov 4 + 5.

Some video from the machine at work will follow soon.

Photo: blackhole-factory

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