radio tesla in october: noise
The physical phenomenon of noise was first described by the Swiss physicist Walter Schottky in 1918: Variations in electric current, when amplified and heard over a loudspeaker, produce a sound similar to that of another type of current - rushing water. The German word "rauschen", meaning both electrical noise and the sound of water in motion, illustrates this association vividly. Similarly, in his book, "Nada Brahma", Joachim-Ernst Behrendt explains that the Sanscrit word, "nada" - sound, noise is directly related to “nadi" - stream, river, but also rushing, sounding.

In the field of acoustics, noise is a sound produced by a combination of audible frequencies. "White noise" is the simultaneous sounding of all frequencies accessible to the human ear - between approximately 16 Hz and 20 kHz - at the same amplitude, or volume. Figuratively, white noise can be viewed as an information cluster in which all perceptible information is present at maximal and equal density, resulting in the masking of individual levels of meaning. Since the 20th century, this transformed understanding of the term has provided new fields of material for composers of music and sound art.

Although noise was long considered to be a disturbance void of meaning, the growth of digital communication has introduced a new dimension to the phenomenon. In a system where all information is transferred in binary code, noise is no longer an unavoidable occurence, but rather a deliberate signal. In this context, however, the meaning of noise remains highly subjective. There are those who believe that so-called "cosmic background noise", which can be perceived through radio-telescopes pointing into empty areas in outer space, is an aftereffect of the Big Bang which formed the universe as we know it.
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