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"If you see and hear sometimes a strong continuous signal that runs for more than a minute or so, that is unlikely to be a meteor echo. VHF radio waves are sometimes affected by an unusual form of ionosphere propagation called "Sporadic E". During this event which can last hours or even days, the radio signal originating from the distant station is reflected by the ionosphere and meteor echoes are impossible to be detected. Sporadic E is specific to summer season in Northern Hemisphere. "

"Echoes from the Borderlands, which transcribes a sound installation tracing the border, insists on the land's inextricability from the history to which it bears witness. "

"Echoes from the Borderlands, which transcribes a sound installation tracing the border, insists on the land's inextricability from the history to which it bears witness. "

There are two ways of seeing this act of invention. In one version, it was the realization of an old dream. answering to ancient susceptibilities. The French photographer Nadar, greeting Edison's invention, said it was as if Rabelais's tale of the sea of frozen words, which released voices into the air when it melted, had passed from the imaginary to the real. Rabelais was dead only thirty-five years when in 1589 the Italian scientist Giovanni Batista della Porta, one of the inventors of the telescope, imagined that he had 'devised a way to preserve words, that have been pronounced, inside lead pipes, in such a manner that they burst forth from them when one removes the cover'. Around the same time a Nuremberg optician suggested enclosing echoes inside bottles, where he thought they would keep for a few hours at least.

Sound mapping + spatial audio experts working with you Delight your audience with immersive experiences: use our free platform to create stereo, binaural, 3D audio and ambisonic soundwalks or get a bespoke solution"

"Is Jeanne Dielmans' apartment on 23, quai du Commerce in Brussels a haunted house? It might well be. Because the dwelling where most of Chantal Akerman's 1975 masterpiece is set is often eerily deserted, with only the distant sounds of shuffling feet and clanging keys filling its hallways. As the camera waits for the titular protagonist to arrive (or lingers after she has left), the rooms are reduced to echo chambers. Jeanne Dielman is disembodied, a ghost even in her own domestic realm. Her visual absence in these moments represents quite literally the invisibility of her plight: a life lived in the shadows, a fate suffered just around a corner, conveniently out of view for the rest of society."

"Using bone conduction, a technology developed for hearing devices, the touch echo installation transmits sounds of the cities which were devastated in the 1945 carpet bombing in the Second World War, through the arms of the visitors when they rest their elbows on the balustrade and hold their ears closed."

"Professor Trevor Cox is a British academic and science communicator, a Senior Media fellow for EPSRC, and is President of the Insitute of Acoustics for the 2010-12 period. Cox has presented a range of popular science documentaries for BBC Radio 4, BBC Radio 3 and BBC World Service, including Sounds of Science, Aural Architecture, Life's Soundtrack, Science vs Strad, The Pleasure of Noise, World Musical Instruments, Dragon's Lab, Biomimicry and Save our Sounds. He was co-originator and judge of BBC Radio 4' 'So You Want To Be A Scientist?', a competition to find Britain's best amateur scientist. He has gained worldwide news coverage for stories such as "Does a duck quack echo?" and "The Worst Sound in the World". He has also investigated the World's scariest scream. In addition, he has appeared in features on BBC1, Teachers TV, Discovery and National Geographic channels, and as an expert in news items on a variety of television and radio channels"

"Bill Fontana's latest project, Silent Echoes Notre-Dame, is a contemporary sound installation in Notre-Dame Cathedral's bell towers. The soundscape records the sounds that Notre-Dame's bells emit in response to the environment around them. "

"The more I work on environmental sound art, the more I'm convinced that what makes it interesting when it works well is a combination of both representation (an echo of another space and time, a there-and-then) and elements of performance, of practice (something happening in the present, here-and-now). Both are important. "

"Pushing off from experiences in which music hails its listener in terms of communal belonging, this essay tries to productively shift our attention towards the queerness of sound itself, as both an agent and a solvent of the political experience of antagonism encountered when identification claims us (or fails to claim to us). Sound- not music but the raw immanence of sounds we cannot identify- can let us hear what is not yet locatable on the available maps of identity. Hearing the queerness of sound might help us echo-locate the edges of subjection, and encounter its ontological outside."

It is all too easy for architecture to be seen and not heard. Instragrammable visuals may be at our fingertips, but it is impossible to photograph an echo. Sad news, considering the most memorable of spaces are those that heighten more than just our optical sense. What's more, much of new architecture is focused on controlling sound, rather than celebrating it. We want to block out our neighbours, escape the city noise, or buffer any possibility of sonic surprise. Here are 10 spaces to remind us of architecture's acoustic abilities - from the unexpected quarry opera venue to the deliberate forest megaphone. If you're a musician, imagine playing in these…

"this immersive audiovisual installation combines the actual sounds of iconic New York interiors, such as Grand Central Terminal and the Seagram Building lobby, with visual animations projected on a panoramic screen. Grand Central Terminal's soundscape, for example, features an oceanic-style animation with clangs, echoes, and quick crescendos of intensity, transporting the listener to the midst of the station's daily bustle, and amplifying its status as a primary transportation portal to and from New York City. Visitors can also experience the soundscapes of Rockefeller Center, the New York Public Library Reading Room, and the Guggenheim Museum."

As the concrete details of Hamm's beating were slowly erased amid years of trials and new racial atrocities perpetuated by law enforcement, Come Out even anticipates the sort of numbness and exhaustion that now results from a 24/7 news cycle that blends outrages and atrocities into a dangerous, undifferentiated mass.

"magine a wide, twisting column of bass in the center of a room with percussive moons spinning around in its orbit. A beat would smash in one corner, and then echo away in a spiral around the room before the pattern continues with the next beat in the following corner. That was a portion of Zemi 17's recent surround sound installation in Greenpoint, Brooklyn. Listeners lay strewn about the carpeted, dark room taking in the aural tale through a multi-channel sound system that he built."

"Sound is everywhere in tropical forests. Rain drips from water-slicked leaves, birds screech, monkeys titter and bellow, branches crack, wind moans, and insects chirp and buzz. Vibrations pierce the humid understory and echo through the airy canopy, creating a symphony of sounds that speaks to both artist and scientist. Monacchi is harvesting artistic inspiration as well as data. The chirps and rattles contain information about how species interact with the environment and each other, as well as the health of the habitat. Sometimes Monacchi uses his recordings to inspire the public, sometimes to inform ecological research. "I'm trying to be at the edge of both worlds," he says."

ELECTRONICOS FANTASTICOS! is a project where retired consumer electronics are resuscitated as instruments, new ways to play music are invented, and all kinds of people are invited to be orchestrated with the artist and musician Ei Wada. Once we dismantle old consumer electronics, we realize the condensed wisdom of pioneers and the interesting and mysterious scientific/physics phenomenon hidden inside these objects. By transferring these into electronic musical instruments, a sound like a groan of electronics begins to echo. Old consumer electronics come to life as yokai-supernatural creatures from Japanese folklore, sometimes they appear as spirits of abandoned tools.

"Sound can be assumed by its transformative properties and processes, as a form of alchemy, a transmutation both tangible and intangible, psychic and physical, where every echo or object is processed in terms of its most primal roots, in terms of deep relationships within nature's elements. In that way, resonance and materiality configure universes, which no longer have to choose between fixed states, but rather stay open to the processes that arise in-between, as a poetic interstice of sonic existence. Directed by the artists Navid Navab, and Michael Montanaro, Aquaphoneia is an interesting installation debutant Ars Electronica 2016: Alchemists of our Time, in which those vibrant process get explored, allowing time and matter to converge in a transmutation of sonic signals; waves and corpuscles between the liquidity of sound and the sound through liquids."

"Interface: Echolocation Headphones. 10/12 Echolocation Headphones is a project that studies new applications for parametric sound technologies. This study emphasizes on augmentation of the auditory sense by enhancing our current ability of processing omnidirectional sound by providing a focal point to audition, similar to a visual focal point. Currently, human echolocation is being explored by the blind who have reached an increased understanding of sound and spatial relationships. In other species echolocation is facilitated by different evolutionary traits that differ from the current human senses. These headphones provide the opportunity for focal audition similar to a focal point in vision, depicting a more detailed spatial image of the parameters of the space surrounding the subject. "

"Echoic memory is a part of sensory memory and refers to auditory memories. The sensory memory that takes into account sounds that you've just encountered is a form of this memory type. Memories and sound are important aspects of your hearing and your ears, so we wanted to take an in-depth look at echoic memory, what it is and how it can affect us."

Trapped in darkness, you must use visualized sound to guide your way through threatening environments. The sounds you create will bounce off obstacles, revealing the shape of the surrounding world. It won't be long before your only way of sensing the world attracts a horrifying evil that devours both sound and souls.