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Sampling Theory 101

Figure 1: A function f and its Fourier transform F(f). Both the function and its Fourier transform are complex-valued, but in graphs like this only the magnitudes of the functions are shown.

Image source; http://idav.ucdavis.edu/~okreylos/PhDStudies/
Winter2000/SamplingTheory.html

Note: An online page I discovered, which was last updated, apparently in Winter of 2000.  It provides a good introduction to the theoretical aspects of sampling.

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This document is a short overview of some aspects of sampling theory which are essential for understanding the problems of Volume Rendering, which can be viewed as nothing but resampling a data set obtained from sampling some unknown function.

Prerequisite for this document is a basic understanding of Fourier Analysis on an intuitive level. You have to know that a function f(x) in the spatial (or time) domain has a counterpart F(f) in the frequency domain. Any function satisfying some simple properties can be written as a weighed sum of harmonic functions (shifted and scaled sine curves), and (F(f))(s), called the Fourier transform or spectrum of f, gives the weight of the harmonic function of frequency s in f.

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REPOST: The ‘Mash Up’ Culture, Teens Use Technology To Mix, Match And Create Their Spheres, by Scott Conroy

Image source: CBS 60 Minutes

Revising my evaluation of mashups led me to this journalistic piece from June 13, 2006 by Scott Conroy from 60 minutes.  It is mentioned here mainly for historical purposes, as some things discussed have obviously changed since the feature was produced.

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Teens don’t have to work very hard to be entertained anymore. Rather than trekking to the record store, they can buy their favorite music with a few clicks — and maybe try out something new while they’re at it. Reality TV, the preferred genre of many, is always on the air. They don’t even have to get up from their chairs to share photographs and gossip with friends.

American society has been assigning all-encompassing labels to generations of young people for a long time. The tendency to pigeonhole a diverse group of individuals is, in some respects, dishonest — not every Flower Child spent the ’60s tiptoeing through tulips, and many members of Generation X surely thought flannel best confined to the realm of the lumberjack.

Read the entire feature at 60 minutes.

A Visit to Mejan Labs: Notes on Sweden’s Approach to Art and Exhibitions, by Eduardo Navas

Image source: sasosedlacek.com

“Space Junk Spotting, by Saso Sedlacek, Software Mashup of Google Earth and a NASA database of space debris.

As part of my residence at the Swedish Traveling Exhibitions, on November 6 I visited Mejan Labs, an art space dedicated to supporting projects that critically reflect on diverse forms of technology.  The art space is located in the heart of the city of Stockholm.  Director Peter Hagdahl and Curator Björn Norberg greeted me upon my arrival.  We spent sometime discussing the history of media, and how Mejan Labs is part of the ongoing development of new media art practice.  In just three years, Mejan Labs has become an exhibition space worth noting outside of Sweden.  I learned about it almost as soon as its first exhibition was launched.  It was quite a treat to be able to visit it and meet  its founders in person.

At the time of my visit, Mejan Labs featured three works that focused on Astronomy, or on the earth in some abstract form.  “Earth and Above” on view from November 5, 2009 to January 12, 2010, presents the works of three artists, “A Space Exodus” (2008) by Larissa Sansour, “No Closer to the Source” (July 20, 1969) by Lisa Oppenheim, and “Space Junk Spotting” by Saso Sedlacek.

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A Visit to the Interactive Institute: Notes on Sweden’s Approach to Art and Exhibitions, by Eduardo Navas

Image: ‘Crisp Bread Turntable’ by Yoshi Akai. Video available below.

As part of my residency at the Swedish Traveling Exhibitions, on October 29 I visited the Interactive Institute, quite a unique research center located in the city of Stockholm.  Its model is unlike any other I have encountered. While the institute has close ties to the arts and the tradition of exhibitions as forms of communication and education, it also focuses on the development of projects that crossover to the commercial sector.  There are actually a few spin-off companies that were started as research collaborations in the Interactive Institute.  But to do justice to their mission, it is best that I quote how they present themselves publicly, from their about page:

The Interactive Institute is a Swedish experimental IT-research institute that combines expertise in art, design and technology to conduct world leading applied research and innovation. We develop new research areas, art concepts, products and services, and provide strategic advice to corporations, the cultural sector and public organisations. Our research results are communicated and exhibited worldwide and brought out to society through commissioned work, license agreements and spin-off companies.

I cite them directly because I find this type of research model to be an increasingly common hybrid: rigorous academic research meets commercial interests.  Yet, the Interactive Institute, seems unique because its creative drive appears to be well balanced, given that it is in the middle of a major corporate technology research sector in Stockholm, located in the neighborhood of Kista. One thing that became certain is that their model is directly informed in part by the always changing aesthetics of networked communication.  In their case, this tendency is found in the concept of “Interactivity;”  such premise is part of their name.

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Nick vs. Nic at Transitio MX, by Eduardo Navas

A performative confrontation between hardware and software.  Nick Collins vs. Nick Collins: hardware vs. Software, Old School vs. New School.  One of the hightlights of the concert series organized as part of “Bifurcaciones Sonoras” (Aural Bifurcations) for Transitio MX 03.

I was able to attend most concerts that took place nightly at Fonoteca, during Transitio MX, except for the last night of Thursday the 8th.  While there were many highlights, one that I found worth sharing on my blog is the performance of Nick vs. Nic.  A playful sound hacking performance by Nick Collins (USA) vs. Nick Collins (England).  The younger Collins (English) improvised in code, while the more seasoned Collins proved why he is one of the pioneers in circuit bending.  The sound was appropriately distributed and mixed on left and right sides of the stage, allowing the audience to evaluate how software and hardware hacking can be complementary, thus creating a performative mashup:  a meeting between the old school and the new school of experimental sound could not be better.

The Aesthetics of Representation in Circuit Bending, by Eduardo Navas

Detail of Szkieve’s circuit bending performance at Montevideo, Uruguay, July 28, 2006.
Image source: http://www.hushush.com

Note: This text was specifically written as a contribution to ReFunct 09’s Symposium taking place at ISEA 09.

One might wonder what is the concrete definition of “circuit bending.”  In a way, the name does not completely connect with the actual activity of appropriating sound from pre-existing sources, ranging from electronic toys to hacked radios, or even half-broken generators. When I first heard the term, I thought it referred to strict manipulation of electronic signals.  This possible definition hints at a certain purity in sound with specific electronic technology; yet, in 2009 circuit bending is quite the opposite, even if in the beginning it may have had a leaning towards hacking electronic gadgets of all types.  At the moment, it is a hybrid practice that appropriates any type of sound, freshly recorded or pre-recorded; re-recorded or significantly manipulated; even erased or retraced–or captured live from the environment in which a performance is taking place to be bent immediately, on the fly.

My most memorable performance of circuit bending took place in Uruguay, on July 28, 2006.  I attended a soundtoys event organized by Brian Mackern, one of the first net-artists from the southern cone, active since at least the mid-nineties. Mackern more recently has become a major supporter of sound performances of all types.   The performance took place at the French Alliance of Montevideo, where I saw Mackern and a number of other sound artists perform on customized software interfaces.  A couple of performers used Max MSP and Jitter, while Mackern presented a series of visual platforms built in Flash that remixed well-known movie clips from Hitchcock and Tarkovsky.

I saw a connection with the aesthetic of sound manipulation often found in circuit bending in these performances; yet, it was the performance of Szkieve (Dimitri della Faille), a Belgian-Canadian Sociologist that left a lingering impression on me.  He is obsessed with collecting toys that produce noise in any shape or form with the purpose to use them in circuit bending performances.  In fact, that afternoon, before the performance, I was invited by both Mackern and Szkieve to join them on a walk in downtown Montevideo.  At the time I knew that Szkieve performed with toys, but did not know exactly how he developed his sets.

That evening Szkieve used a green plastic fish toy which he had bought from a street vendor during our walk.  He pulled and released a string from the fish, which then emitted an expected fish-like sound that Szkieve slowly distorted into an echoish abstract noise, somewhat reminiscent of dub.  Szkieve then combined the loop with the distorted sample of a toy train that moved on a circular track.  The pitch of the train’s motion was drastically lowered several notes, turning it into a cacophonous massive bass sound that directly contradicted the petiteness of the actual train.  Szkieve also mixed loops from various electronic devices through a mixer.  If the audience had not experienced the visual development of the performance, the sound could easily have been mistaken for just another experimental electronic mix, carefully developed in a music studio–rather than from toys found at any corner store.

Szkieve’s performance is a good example of how the key to creativity is not so much the ability to produce sound from scratch, or have an advanced skill in performance, but actually to be able to conceptualize the potential of material that may already have a function, or holds particular cultural value.  In this sense, circuit bending is a unique link between individuals who believe that all production should be developed and manipulated from scratch, and individuals who are primarily invested in acts of sampling and recombining material, as commonly understood in Remix.  Circuit bending exposes how in the end it is not important if something is performed live or looped, or is a mix of the two, but rather whether or not what is performed challenges the audience’s perception of the source material.  This is true not just for sound and noise performers, but artists in all fields.

I must admit that I often view circuit bending primarily as a performance based medium.  My case in point is  Szkieve’s performance, in which the sound may not be as interesting on its own but in conjunction with its visual development.

However, Circuit bending is becoming more diverse. In 2009 it is closely linked to physical computing and all types of art installations.  What is promising about circuit bending is that it can be a medium, as well as a tool: it can include software and hardware, or exclude either one, as long as its only requisite is met: that perception be bent.  Most importantly, like Remix, circuit bending can also be an aesthetic, to be cited in literary terms:

The snare of a wet red elastic nylon wire licking the bass-line of grey wooden-nails bound with the blind screams of a last name never to be famous and always worth mentioning; the beat of gracefully scratched hair longer than the history of the will, pushing the finger that struggles to penetrate its own castration; the speed of trust on the Internet, showing off its color as it begins to understand its dependence on truth…

The series of workshops and symposium at ReFunct 09, taking place at ISEA, in Ireland, are likely to push circuit bending’s definition, perhaps to the point that people like myself will no longer desire a live performance, but simply aspire to think beyond representation as we know it.

944 Nightlife Issue, KCRW DJ’s Featured, by Eduardo Navas

Image: 944.com

I’m currently in Los Angeles.  Just picked up a copy of 944, a magazine about fashion, entertainment and lifestyle.  The August issue features “the nightlife.”  Like most lifestyle magazines these days, it consists of short snippets about trendsetters or “pioneers.”  One cannot help but notice a quote stating that DJ’s can make as much as 35,000 for a three hour set.  The magazine truly hypes up the life on the ones and twos.

Regardless of such statements, as I  grew up in Los Angeles, I was quite happy to see that 944 acknowledged real talent.  Above are some of the DJ’s that have shaped my views on music beyond the mainstream.  Trinidad’s Chocolate City may well be a historical gem of a radio show, which any music historian specialized in radio would have to note; he has a vast knowledge of R & B and Soul and has taken great care to bring back B-sides that even serious record diggers have missed.  The same for Jason Bentley, who was around even before Garth with his radio show, Metropolis.  Bentley was one of the first DJ’s to mix electronic music live on the radio.

The entire magazine can be browsed in a well designed flash interface: http://proofcenter.944.com/flipbook/?locale=4

REBLOG: DopplerPad: Music Remixing and Sampling on the iPhone, by Ben Parr

YouTube: The Doppler Effect

Text source: Mashable

We knew you could make great music on the iPhone. With instrument apps such as Smule’s Ocarina and Leaf Trombone. Still, while they’re cool and surprisingly rich mobile instruments, they’re not all that practical for creating, sampling, and recording musical compositions on the fly.

DopplerPad [iTunes Link] is a turntable-like instrument iPhone app built by one of the two creators of FourTrack [iTunes Link]. Unlike some other apps, this one doesn’t feature just one instrument – it has 37. It doesn’t just play notes; it lets you sample them, no matter where you are. And most of all, you can record and combine the beats to create your own electronic remix.

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Cultural Center of Spain Events: Premio Arte Joven and Latina Urbana, by Eduardo Navas

From left to right: Eduardo Navas, Seidel Brito, Mónica Mejia (CCE Program Coordinator), and Clara Astiasarán. Discussing the ongoing selections of Arte Joven.

I visited San Salvador in June.  This time I was invited again by Cultural Center of Spain to be a juror for their  Premio Arte Joven 2009 (Young Artist Award 2009).  The prize has been in place for ten years now, and has proven to be an important cultural element in supporting young artists in their early professional development.

From far left to right: Saidel Brito and Eduardo Navas, discussing the selection process with applicants. Clara Astiasarán participated via Skype.

I was in excellent company with fellow jurors Cuban artist Saidel Brito, and Cuban art critic Clara Astiasarán.  We spent several intensive hours going over 71 proposals, from which we chose eight by artists: Ernesto Bautista, Héctor Bermúdez, Boris Ciudad Real, Mauricio Esquivel, Melissa Guevara, José David Herrera, Mauricio Kabistan, and Hugo Rivas.  Their projects will be featured in an exhibition in October 2009.  From the selected artists three will be chosen by a different set of jurors for first, second, and third place awards that include cash prizes.  The October exhibition is complemented with a well produced catalogue.

Aside from meeting with the eight artists to discuss the possibilities of installation and development of their proposals, we, as jurors, also decided to meet with all applicants to explain the selection process and encourage artists to meet each other and converse. This was a way to support and expand the growing art community of El Salvador.  The turn out was great and we had an extensive and constructive exchange about art practice and professional development.

DJ A Todo Color, warming up the crowd for recording artists Ikah and Ari Puello on the International Day of Music, June 20, 2009.

Ikah keeps the crowd shaking during her set.

During my stay in San Salvador, on Saturday June 20, I was able to attend a concert also organized by the Cultural Center of Spain in collaboration with the Cultural French Alliance, featuring local rap artists, including Pescozada and Five o Three.  This was the second year in which the French initiated public event “International Day of Music” was extended to the streets of San Salvador.  The main feature of the night was Latina Urbana, a touring act consisting of Ikah, based in Madrid; and Arianna Puello, based in Barcelona. Both recording artists consistently tour throughout Latin America.  They were gracefully supported by the beats of DJ A Todo Color (DJ total color), also from Barcelona.

Ari Puello breaking it down from beginning to end.

The evening was well organized as Pescozada and Five o Three warmed up the crowd for Ikah, who with her R & B compositions kept the crowd going.  Ari Puello closed the evening with a strong set of some of her best hits.  Ikah has one album and Puello has four.  Puello is actually considered an important artist in Latin American rap. Many people in the audience sang along with her while waving their hands in acknowledgment of her well calculated rhyme and beat.

Brief Reflection on MJ, by Eduardo Navas

Image source: Solar Navigator

As I write this entry, the Internet is flowing with comments and information about Michael Jackson.  Here is my drop in the sea of data that will be archived in places people who adopt RSS as part of their daily life will never know exist.

As critical as I am about pop culture, I have to admit that Michael Jackson was ever-present in my growing years; the teenager in me mourns, while the critic cannot help but reflect on the implications of this unexpected and unfortunate death.  As sad as Jackson’s passing away is to millions of people, one cannot help but notice how media has changed in the way it handles celebrities and public figures. Just a few years ago there would have been some distance from the dark side of a person’s life.  This may still hold true for presidents of the United States as one hardly heard anything negative about Richard Nixon during his funeral.  Watergate had become so abstract that it could be cited as a historical moment with no major shame for the country or Nixon’s presidency.  This is the power of ahistoricity: people’s  lack of historical knowledge made possible by 24 hour news cycles.

But with Michael Jackson a different kind of mourning takes place. His accomplishments and setbacks are cited simultaneously.  Everywhere, from CNN to all major newspapers, like the NYTimes and El Pais in Spain, Michael Jackson is remembered for all his deeds–good and bad.  As he is remembered as the King of Pop, he is also remembered as a  person who was accused of child molestation (this was not proven in court).  He is subjected to the aesthetic of reality TV.

In a way this might be healthy for the way people perceive celebrities, as people may become more accepting of public figures’ shortcomings.  The sad thing is that scandals sell, and this is the last thing Michael Jackson is remembered for.  The King of Pop was planning a comeback, but this one was not to be.  He will be remembered as a  conflicted figure, who will inevitably be romanticized for his early production and his conflicted last years.

And now, it is time to settle for reissues of MJ’s music in whatever form networked culture will allow.  As I write these lines, files of Jackson’s songs are being swapped across the Internet–bootleg remixes made in bedrooms across the world to be shared in just minutes, while music executives figure out a way to cash in on MJ’s music legacy.    Such cash-in will be mixed and hard to control.  Michael Jackson dies in a time when things for the music industry are not so clear cut and no celebrity is perfect, and that imperfection in the end may mean more cash

He was a person who everyone knew through spectacular images.  He may have known himself through the same images as well.  As constant exposure rises with social networks, Michael Jackson, the most famous person vanishes.  Let this be a rupture in the era of networked media.  Michael Jackson is about to become an institution,  like Marilyn, like Presley, like Warhol.  He will live forever as a spectacular figure.  But let’s not forget that somewhere in there was a child who was trying to understand himself.  I may be accused of a bit of romanticism with this last statement.  Let it be. This is why I chose an early image of Michael Jackson to complement this short reflection on a celebrity I felt I knew, as I had no choice but to acknowledge him everywhere I turned as I grew up.  I accepted him as I was bombarded by his presence, just as I am now by the repetition of his spectacular absence.  I admit to have moonwalked.  RIP MJ.