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Da·ten·trä·ger
/ˈdaːtn̩trɛːɡɐ,Dátenträger/
Substantiv, maskulin [der]
etwas (Magnetband, Diskette, CD-ROM, Festplatte), worauf Daten, meist in codierter Form, gespeichert werden können; Speichermedium
Includes unlimited streaming of A/R/S™ — 105 — Echo
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The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. It is named after the Austrian physicist Christian Doppler, who described the phenomenon in 1842.
A common example of Doppler shift is the change of pitch heard when a vehicle sounding a horn approaches and recedes from an observer. Compared to the emitted frequency, the received frequency is higher during the approach, identical at the instant of passing by, and lower during the recession.
The reason for the Doppler effect is that when the source of the waves is moving towards the observer, each successive wave crest is emitted from a position closer to the observer than the crest of the previous wave.
Therefore, each wave takes slightly less time to reach the observer than the previous wave. Hence, the time between the arrivals of successive wave crests at the observer is reduced, causing an increase in the frequency. While they are traveling, the distance between successive wave fronts is reduced, so the waves "bunch together". Conversely, if the source of waves is moving away from the observer, each wave is emitted from a position farther from the observer than the previous wave, so the arrival time between successive waves is increased, reducing the frequency. The distance between successive wave fronts is then increased, so the waves "spread out".
For waves that propagate in a medium, such as sound waves, the velocity of the observer and of the source are relative to the medium in which the waves are transmitted. The total Doppler effect may therefore result from motion of the source, motion of the observer, or motion of the medium. Each of these effects is analyzed separately. For waves which do not require a medium, such as light or gravity in general relativity, only the relative difference in velocity between the observer and the source needs to be considered.
in physics, sound is a vibration that propagates as
an acoustic wave, through a transmission medium
such as a gas, liquid or solid. in human physiology
and psychology, sound is the reception of such waves
and their perception by the brain. only acoustic waves
that have frequencies lying between about 20 Hz and
20 kHz, the audio frequency range, elicit an auditory
percept in humans. in air at atmospheric pressure,
these represent sound waves with wavelengths of 17
meters (56 ft) to 1.7 centimetres (0.67 in). sound waves
above 20 kHz are known as ultrasound and are
not audible to humans. sound waves below 20 Hz
are known as infrasound.
different animal species have varying hearing ranges.
sound is defined as oscillation in pressure, stress,
particle displacement, particle velocity, etc.,
propagated in a medium with internal forces
(e.g., elastic or viscous), or the superposition of
such propagated oscillation. auditory sensation evoked
by the oscillation described in sound can be viewed
as a wave motion in air or other elastic media.
in this case, sound is a stimulus. sound can also be
viewed as an excitation of the hearing mechanism
that results in the perception of sound.
in this case, sound is a sensation.
credits
released September 8, 2019
A/R/S™ Archer Research Station - Digital - Archive - History
seefeld*
Construction–Sequences–Objects
Digital Sampling and Sonic Sculptures
Midi Manipulation–Stolen Audio Information and Bits
were Re-programmed–Modified and Re-Combined
at Sweet Home Studio 2022
All Tracks Recorded Executed and Masterd by
seefeld*
WARNING CARE SHOULD BE TAKEN DURING PLAYBACK OF THIS RECORDINGS AS CERTAIN FREQUENCY INFORMATION COULD DAMAGE UNDER-
SPECIFIED LOUDSPEAKERS AT HIGH DB LEVELS.
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