Tag Archive | Acoustics

Acousmatic Surveillance and Big Data

Sound and Surveilance4

It’s an all too familiar movie trope. A bug hidden in a flower jar. A figure in shadows crouched listening at a door. The tape recording that no one knew existed, revealed at the most decisive of moments. Even the abrupt disconnection of a phone call manages to arouse the suspicion that we are never as alone as we may think. And although surveillance derives its meaning the latin “vigilare” (to watch) and French “sur-“ (over), its deep connotations of listening have all but obliterated that distinction.

Moving on from cybernetic games to modes of surveillance that work through composition and patterns. Here, Robin James challenges us to consider the unfamiliar resonances produced by our IP addresses, search histories, credit trails, and Facebook posts. How does the NSA transform our data footprints into the sweet, sweet, music of surveillance? Shhhhhhhh! Let’s listen in. . . -AT

Kate Crawford has argued that there’s a “big metaphor gap in how we describe algorithmic filtering.” Specifically, its “emergent qualities” are particularly difficult to capture. This process, algorithmic dataveillance, finds and tracks dynamic patterns of relationships amongst otherwise unrelated material. I think that acoustics can fill the metaphor gap Crawford identifies. Because of its focus on identifying emergent patterns within a structure of data, rather than its cause or source, algorithmic dataveillance isn’t panoptic, but acousmatic. Algorithmic dataveillance is acousmatic because it does not observe identifiable subjects, but ambient data environments, and it “listens” for harmonics to emerge as variously-combined data points fall into and out of phase/statistical correlation.

Dataveillance defines the form of surveillance that saturates our consumer information society. As this promotional Intel video explains, big data transcends the limits of human perception and cognition – it sees connections we cannot. And, as is the case with all superpowers, this is both a blessing and a curse. Although I appreciate emails from my local supermarket that remind me when my favorite bottle of wine is on sale, data profiling can have much more drastic and far-reaching effects. As Frank Pasquale has argued, big data can determine access to important resources like jobs and housing, often in ways that reinforce and deepen social inequities. Dataveillance is an increasingly prominent and powerful tool that determines many of our social relationships.

The term dataveillance was coined in 1988 by Roger Clarke, and refers to “the systematic use of personal data systems in the investigation or monitoring of the actions or communications of one or more persons.” In this context, the person is the object of surveillance and data is the medium through which that surveillance occurs. Writing 20 years later, Michael Zimmer identifies a phase-shift in dataveillance that coincides with the increased popularity and dominance of “user-generated and user-driven Web technologies” (2008). These technologies, found today in big social media, “represent a new and powerful ‘infrastructure of dataveillance,’ which brings about a new kind of panoptic gaze of both users’ online and even their offline activities” (Zimmer 2007). Metadataveillance and algorithmic filtering, however, are not variations on panopticism, but practices modeled—both historically/technologically and metaphorically—on acoustics.

In 2013, Edward Snowden’s infamous leaks revealed the nuts and bolts of the National Security Administration’s massive dataveillance program. They were collecting data records that, according to the Washington Post, included “e-mails, attachments, address books, calendars, files stored in the cloud, text or audio or video chats and ‘metadata’ that identify the locations, devices used and other information about a target.” The most enduringly controversial aspect of NSA dataveillance programs has been the bulk collection of Americans’ data and metadata—in other words, the “big data”-veillance programs.


Borrowed fro thierry ehrmann @Flickr CC BY.

Borrowed from thierry ehrmann @Flickr CC BY.

Instead of intercepting only the communications of known suspects, this big dataveillance collects everything from everyone and mines that data for patterns of suspicious behavior; patterns that are consistent with what algorithms have identified as, say, “terrorism.” As Cory Doctorow writes in BoingBoing, “Since the start of the Snowden story in 2013, the NSA has stressed that while it may intercept nearly every Internet user’s communications, it only ‘targets’ a small fraction of those, whose traffic patterns reveal some basis for suspicion.” “Suspicion,” here, is an emergent property of the dataset, a pattern or signal that becomes legible when you filter communication (meta)data through algorithms designed to hear that signal amidst all the noise.

Hearing a signal from amidst the noise, however, is not sufficient to consider surveillance acousmatic. “Panoptic” modes of listening and hearing, though epitomized by the universal and internalized gaze of the guards in the tower, might also be understood as the universal and internalized ear of the confessor. This is the ear that, for example, listens for conformity between bodily and vocal gender presentation. It is also the ear of audio scrobbling, which, as Calum Marsh has argued, is a confessional, panoptic music listening practice.

Therefore, when President Obama argued that “nobody is listening to your telephone calls,” he was correct. But only insofar as nobody (human or AI) is “listening” in the panoptic sense. The NSA does not listen for the “confessions” of already-identified subjects. For example, this court order to Verizon doesn’t demand recordings of the audio content of the calls, just the metadata. Again, the Washington Post explains:

The data doesn’t include the speech in a phone call or words in an email, but includes almost everything else, including the model of the phone and the “to” and “from” lines in emails. By tracing metadata, investigators can pinpoint a suspect’s location to specific floors of buildings. They can electronically map a person’s contacts, and their contacts’ contacts.

NSA dataveillance listens acousmatically because it hears the patterns of relationships that emerge from various combinations of data—e.g., which people talk and/or meet where and with what regularity. Instead of listening to identifiable subjects, the NSA identifies and tracks emergent properties that are statistically similar to already-identified patterns of “suspicious” behavior. Legally, the NSA is not required to identify a specific subject to surveil; instead they listen for patterns in the ambience. This type of observation is “acousmatic” in the sound studies sense because the sounds/patterns don’t come from one identifiable cause; they are the emergent properties of an aggregate.

Borrowed from david @Flickr CC BY-NC.

Borrowed from david @Flickr CC BY-NC.

Acousmatic listening is a particularly appropriate metaphor for NSA-style dataveillance because the emergent properties (or patterns) of metadata are comparable to harmonics or partials of sound, the resonant frequencies that emerge from a specific combination of primary tones and overtones. If data is like a sound’s primary tone, metadata is its overtones. When two or more tones sound simultaneously, harmonics emerge whhen overtones vibrate with and against one another. In Western music theory, something sounds dissonant and/or out of tune when the harmonics don’t vibrate synchronously or proportionally. Similarly, tones that are perfectly in tune sometimes create a consonant harmonic. The NSA is listening for harmonics. They seek metadata that statistically correlates to a pattern (such as “terrorism”), or is suspiciously out of correlation with a pattern (such as US “citizenship”). Instead of listening to identifiable sources of data, the NSA listens for correlations among data.

Both panopticism and acousmaticism are technologies that incite behavior and compel people to act in certain ways. However, they both use different methods, which, in turn, incite different behavioral outcomes. Panopticism maximizes efficiency and productivity by compelling conformity to a standard or norm. According to Michel Foucault, the outcome of panoptic surveillance is a society where everyone synchs to an “obligatory rhythm imposed from the outside” (151-2), such as the rhythmic divisions of the clock (150). In other words, panopticism transforms people into interchangeable cogs in an industrial machine.  Methodologically, panopticism demands self-monitoring. Foucault emphasizes that panopticism functions most efficiently when the gaze is internalized, when one “assumes responsibility for the constraints of power” and “makes them play…upon himself” (202). Panopticism requires individuals to synchronize themselves with established compulsory patterns.

Acousmaticism, on the other hand, aims for dynamic attunement between subjects and institutions, an attunement that is monitored and maintained by a third party (in this example, the algorithm). For example, Facebook’s News Feed algorithm facilitates the mutual adaptation of norms to subjects and subjects to norms. Facebook doesn’t care what you like; instead it seeks to transform your online behavior into a form of efficient digital labor. In order to do this, Facebook must adjust, in part, to you. Methodologically, this dynamic attunement is not a practice of internalization, but unlike Foucault’s panopticon, big dataveillance leverages outsourcing and distribution. There is so much data that no one individual—indeed, no one computer—can process it efficiently and intelligibly. The work of dataveillance is distributed across populations, networks, and institutions, and the surveilled “subject” emerges from that work (for example, Rob Horning’s concept of the “data self”). Acousmaticism tunes into the rhythmic patterns that synch up with and amplify its cycles of social, political, and economic reproduction.

Sonic Boom! Borrowed from NASA's Goddard Space Flight Center @Flickr CC BY.

Sonic Boom! Borrowed from NASA’s Goddard Space Flight Center @Flickr CC BY.

Unlike panopticism, which uses disciplinary techniques to eliminate noise, acousmaticism uses biopolitical techniques to allow profitable signals to emerge as clearly and frictionlessly as possible amid all the noise (for more on the relation between sound and biopolitics, see my previous SO! essay). Acousmaticism and panopticism are analytically discrete, yet applied in concert. For example, certain tiers of the North Carolina state employee’s health plan require so-called “obese” and tobacco-using members to commit to weight-loss and smoking-cessation programs. If these members are to remain eligible for their selected level of coverage, they must track and report their program-related activities (such as exercise). People who exhibit patterns of behavior that are statistically risky and unprofitable for the insurance company are subject to extra layers of surveillance and discipline. Here, acousmatic techniques regulate the distribution and intensity of panoptic surveillance. To use Nathan Jurgenson’s turn of phrase, acousmaticism determines “for whom” the panoptic gaze matters. To be clear, acousmaticism does not replace panopticism; my claim is more modest. Acousmaticism is an accurate and productive metaphor for theorizing both the aims and methods of big dataveillance, which is, itself, one instrument in today’s broader surveillance ensemble.

Featured image “Big Brother 13/365” by Dennis Skley CC BY-ND.

Robin James is Associate Professor of Philosophy at UNC Charlotte. She is author of two books: Resilience & Melancholy: pop music, feminism, and neoliberalism will be published by Zer0 books this fall, and The Conjectural Body: gender, race and the philosophy of music was published by Lexington Books in 2010. Her work on feminism, race, contemporary continental philosophy, pop music, and sound studies has appeared in The New Inquiry, Hypatia, differences, Contemporary Aesthetics, and the Journal of Popular Music Studies. She is also a digital sound artist and musician. She blogs at its-her-factory.com and is a regular contributor to Cyborgology.

tape reelREWIND!…If you liked this post, check out:

“Cremation of the senses in friendly fire”: on sound and biopolitics (via KMFDM & World War Z)–Robin James

The Dark Side of Game Audio: The Sounds of Mimetic Control and Affective ConditioningAaron Trammell

Listening to Whisperers: Performance, ASMR Community, and Fetish on YouTube–Joshua Hudelson

The Better to Hear You With, My Dear: Size and the Acoustic World

Hearing the Unheard IIToday the SO! Thursday stream inaugurates a four-part series entitled Hearing the UnHeard, which promises to blow your mind by way of your ears. Our Guest Editor is Seth Horowitz, a neuroscientist at NeuroPop and author of The Universal Sense: How Hearing Shapes the Mind (Bloomsbury, 2012), whose insightful work on brings us directly to the intersection of the sciences and the arts of sound.9781608190904

That’s where he’ll be taking us in the coming weeks. Check out his general introduction just below, and his own contribution for the first piece in the series. — NV

Welcome to Hearing the UnHeard, a new series of articles on the world of sound beyond human hearing. We are embedded in a world of sound and vibration, but the limits of human hearing only let us hear a small piece of it. The quiet library screams with the ultrasonic pulsations of fluorescent lights and computer monitors. The soothing waves of a Hawaiian beach are drowned out by the thrumming infrasound of underground seismic activity near “dormant” volcanoes. Time, distance, and luck (and occasionally really good vibration isolation) separate us from explosive sounds of world-changing impacts between celestial bodies. And vast amounts of information, ranging from the songs of auroras to the sounds of dying neurons can be made accessible and understandable by translating them into human-perceivable sounds by data sonification.

Four articles will examine how this “unheard world” affects us. My first post below will explore how our environment and evolution have constrained what is audible, and what tools we use to bring the unheard into our perceptual realm. In a few weeks, sound artist China Blue will talk about her experiences recording the Vertical Gun, a NASA asteroid impact simulator which helps scientists understand the way in which big collisions have shaped our planet (and is very hard on audio gear). Next, Milton A. Garcés, founder and director of the Infrasound Laboratory of University of Hawaii at Manoa will talk about volcano infrasound, and how acoustic surveillance is used to warn about hazardous eruptions. And finally, Margaret A. Schedel, composer and Associate Professor of Music at Stonybrook University will help readers explore the world of data sonification, letting us listen in and get greater intellectual and emotional understanding of the world of information by converting it to sound.

— Guest Editor Seth Horowitz

Although light moves much faster than sound, hearing is your fastest sense, operating about 20 times faster than vision. Studies have shown that we think at the same “frame rate” as we see, about 1-4 events per second. But the real world moves much faster than this, and doesn’t always place things important for survival conveniently in front of your field of view. Think about the last time you were driving when suddenly you heard the blast of a horn from the previously unseen truck in your blind spot.

Hearing also occurs prior to thinking, with the ear itself pre-processing sound. Your inner ear responds to changes in pressure that directly move tiny little hair cells, organized by frequency which then send signals about what frequency was detected (and at what amplitude) towards your brainstem, where things like location, amplitude, and even how important it may be to you are processed, long before they reach the cortex where you can think about it. And since hearing sets the tone for all later perceptions, our world is shaped by what we hear (Horowitz, 2012).

But we can’t hear everything. Rather, what we hear is constrained by our biology, our psychology and our position in space and time. Sound is really about how the interaction between energy and matter fill space with vibrations. This makes the size, of the sender, the listener and the environment, one of the primary features that defines your acoustic world.

You’ve heard about how much better your dog’s hearing is than yours. I’m sure you got a slight thrill when you thought you could actually hear the “ultrasonic” dog-training whistles that are supposed to be inaudible to humans (sorry, but every one I’ve tested puts out at least some energy in the upper range of human hearing, even if it does sound pretty thin). But it’s not that dogs hear better. Actually, dogs and humans show about the same sensitivity to sound in terms of sound pressure, with human’s most sensitive region from 1-4 kHz and dogs from about 2-8 kHz. The difference is a question of range and that is tied closely to size.

Most dogs, even big ones, are smaller than most humans and their auditory systems are scaled similarly. A big dog is about 100 pounds, much smaller than most adult humans. And since body parts tend to scale in a coordinated fashion, one of the first places to search for a link between size and frequency is the tympanum or ear drum, the earliest structure that responds to pressure information. An average dog’s eardrum is about 50 mm2, whereas an average human’s is about 60 mm2. In addition while a human’s cochlea is spiral made of 2.5 turns that holds about 3500 inner hair cells, your dog’s has 3.25 turns and about the same number of hair cells. In short: dogs probably have better high frequency hearing because their eardrums are better tuned to shorter wavelength sounds and their sensory hair cells are spread out over a longer distance, giving them a wider range.

Interest in the how hearing works in animals goes back centuries. Classical image of comparative ear anatomy from 1789 by Andreae Comparetti.

Interest in the how hearing works in animals goes back centuries. Classical image of comparative ear anatomy from 1789 by Andreae Comparetti.

Then again, if hearing was just about size of the ear components, then you’d expect that yappy 5 pound Chihuahua to hear much higher frequencies than the lumbering 100 pound St. Bernard. Yet hearing sensitivity from the two ends of the dog spectrum don’t vary by much. This is because there’s a big difference between what the ear can mechanically detect and what the animal actually hears. Chihuahuas and St. Bernards are both breeds derived from a common wolf-like ancestor that probably didn’t have as much variability as we’ve imposed on the domesticated dog, so their brains are still largely tuned to hear what a medium to large pseudo wolf-like animal should hear (Heffner, 1983).

But hearing is more than just detection of sound. It’s also important to figure out where the sound is coming from. A sound’s location is calculated in the superior olive – nuclei in the brainstem that compare the difference in time of arrival of low frequency sounds at your ears and the difference in amplitude between your ears (because your head gets in the way, making a sound “shadow” on the side of your head furthest from the sound) for higher frequency sounds. This means that animals with very large heads, like elephants, will be able to figure out the location of longer wavelength (lower pitched) sounds, but probably will have problems localizing high pitched sounds because the shorter frequencies will not even get to the other side of their heads at a useful level. On the other hand, smaller animals, which often have large external ears, are under greater selective pressure to localize higher pitched sounds, but have heads too small to pick up the very low infrasonic sounds that elephants use.

Audiograms (auditory sensitivity in air measured in dB SPL) by frequency of animals of different sizes showing the shift of maximum sensitivity to lower frequencies with increased size. Data replotted based on audiogram data by Sivian and White, 1933; ISO 1961; Heffner and Masterton, 1980; Heffner and Heffner, 1982; Heffner, 1983; Jackson et al, 1999.

Audiograms (auditory sensitivity in air measured in dB SPL) by frequency of animals of different sizes showing the shift of maximum sensitivity to lower frequencies with increased size. Data replotted based on audiogram data by Sivian and White (1933). “On minimum audible sound fields.” Journal of the Acoustical Society of America, 4: 288-321; ISO 1961; Heffner, H., & Masterton, B. (1980). “Hearing in glires: domestic rabbit, cotton rat, feral house mouse, and kangaroo rat.” Journal of the Acoustical Society of America, 68, 1584-1599.; Heffner, R. S., & Heffner, H. E. (1982). “Hearing in the elephant: Absolute sensitivity, frequency discrimination, and sound localization.” Journal of Comparative and Physiological Psychology, 96, 926-944.; Heffner H.E. (1983). “Hearing in large and small dogs: Absolute thresholds and size of the tympanic membrane.” Behav. Neurosci. 97: 310-318. ; Jackson, L.L., et al.(1999). “Free-field audiogram of the Japanese macaque (Macaca fuscata).” Journal of the Acoustical Society of America, 106: 3017-3023.

But you as a human are a fairly big mammal. If you look up “Body Size Species Richness Distribution” which shows the relative size of animals living in a given area, you’ll find that humans are among the largest animals in North America (Brown and Nicoletto, 1991). And your hearing abilities scale well with other terrestrial mammals, so you can stop feeling bad about your dog hearing “better.” But what if, by comic-book science or alternate evolution, you were much bigger or smaller? What would the world sound like? Imagine you were suddenly mouse-sized, scrambling along the floor of an office. While the usual chatter of humans would be almost completely inaudible, the world would be filled with a cacophony of ultrasonics. Fluorescent lights and computer monitors would scream in the 30-50 kHz range. Ultrasonic eddies would hiss loudly from air conditioning vents. Smartphones would not play music, but rather hum and squeal as their displays changed.

And if you were larger? For a human scaled up to elephantine dimensions, the sounds of the world would shift downward. While you could still hear (and possibly understand) human speech and music, the fine nuances from the upper frequency ranges would be lost, voices audible but mumbled and hard to localize. But you would gain the infrasonic world, the low rumbles of traffic noise and thrumming of heavy machinery taking on pitch, color and meaning. The seismic world of earthquakes and volcanoes would become part of your auditory tapestry. And you would hear greater distances as long wavelengths of low frequency sounds wrap around everything but the largest obstructions, letting you hear the foghorns miles distant as if they were bird calls nearby.

But these sounds are still in the realm of biological listeners, and the universe operates on scales far beyond that. The sounds from objects, large and small, have their own acoustic world, many beyond our ability to detect with the equipment evolution has provided. Weather phenomena, from gentle breezes to devastating tornadoes, blast throughout the infrasonic and ultrasonic ranges. Meteorites create infrasonic signatures through the upper atmosphere, trackable using a system devised to detect incoming ICBMs. Geophones, specialized low frequency microphones, pick up the sounds of extremely low frequency signals foretelling of volcanic eruptions and earthquakes. Beyond the earth, we translate electromagnetic frequencies into the audible range, letting us listen to the whistlers and hoppers that signal the flow of charged particles and lightning in the atmospheres of Earth and Jupiter, microwave signals of the remains of the Big Bang, and send listening devices on our spacecraft to let us hear the winds on Titan.

Here is a recording of whistlers recorded by the Van Allen Probes currently orbiting high in the upper atmosphere:

When the computer freezes or the phone battery dies, we complain about how much technology frustrates us and complicates our lives. But our audio technology is also the source of wonder, not only letting us talk to a friend around the world or listen to a podcast from astronauts orbiting the Earth, but letting us listen in on unheard worlds. Ultrasonic microphones let us listen in on bat echolocation and mouse songs, geophones let us wonder at elephants using infrasonic rumbles to communicate long distances and find water. And scientific translation tools let us shift the vibrations of the solar wind and aurora or even the patterns of pure math into human scaled songs of the greater universe. We are no longer constrained (or protected) by the ears that evolution has given us. Our auditory world has expanded into an acoustic ecology that contains the entire universe, and the implications of that remain wonderfully unclear.


Exhibit: Home Office

This is a recording made with standard stereo microphones of my home office. Aside from usual typing, mouse clicking and computer sounds, there are a couple of 3D printers running, some music playing, largely an environment you don’t pay much attention to while you’re working in it, yet acoustically very rich if you pay attention.


This sample was made by pitch shifting the frequencies of sonicoffice.wav down so that the ultrasonic moves into the normal human range and cuts off at about 1-2 kHz as if you were hearing with mouse ears. Sounds normally inaudible, like the squealing of the computer monitor cycling on kick in and the high pitched sound of the stepper motors from the 3D printer suddenly become much louder, while the familiar sounds are mostly gone.


This recording of the office was made with a Clarke Geophone, a seismic microphone used by geologists to pick up underground vibration. It’s primary sensitivity is around 80 Hz, although it’s range is from 0.1 Hz up to about 2 kHz. All you hear in this recording are very low frequency sounds and impacts (footsteps, keyboard strikes, vibration from printers, some fan vibration) that you usually ignore since your ears are not very well tuned to frequencies under 100 Hz.


Finally, this sample was made by pitch shifting the frequencies of infrasonicoffice.wav up as if you had grown to elephantine proportions. Footsteps and computer fan noises (usually almost indetectable at 60 Hz) become loud and tonal, and all the normal pitch of music and computer typing has disappeared aside from the bass. (WARNING: The fan noise is really annoying).


The point is: a space can sound radically different depending on the frequency ranges you hear. Different elements of the acoustic environment pop up depending on the type of recording instrument you use (ultrasonic microphone, regular microphones or geophones) or the size and sensitivity of your ears.

Spectrograms (plots of acoustic energy [color] over time [horizontal axis] by frequency band [vertical axis]) from a 90 second recording in the author’s home office covering the auditory range from ultrasonic frequencies (>20 kHz top) to the sonic (20 Hz-20 kHz, middle) to the low frequency and infrasonic (<20 Hz).

Spectrograms (plots of acoustic energy [color] over time [horizontal axis] by frequency band [vertical axis]) from a 90 second recording in the author’s home office covering the auditory range from ultrasonic frequencies (>20 kHz top) to the sonic (20 Hz-20 kHz, middle) to the low frequency and infrasonic (<20 Hz).

Featured image by Flickr User Jaime Wong.

Seth S. Horowitz, Ph.D. is a neuroscientist whose work in comparative and human hearing, balance and sleep research has been funded by the National Institutes of Health, National Science Foundation, and NASA. He has taught classes in animal behavior, neuroethology, brain development, the biology of hearing, and the musical mind. As chief neuroscientist at NeuroPop, Inc., he applies basic research to real world auditory applications and works extensively on educational outreach with The Engine Institute, a non-profit devoted to exploring the intersection between science and the arts. His book The Universal Sense: How Hearing Shapes the Mind was released by Bloomsbury in September 2012.

tape reel

REWIND! If you liked this post, check out …

Reproducing Traces of War: Listening to Gas Shell Bombardment, 1918– Brian Hanrahan

Learning to Listen Beyond Our Ears– Owen Marshall

This is Your Body on the Velvet Underground– Jacob Smith

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