Car alarm
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0Car alarm
"Car Alarm" is a rhythmic, high-frequency, deliberately unpleasant sound: alternating two or three tones in the 1–3 kHz range, tempo about 4–6 Hz, total loudness about 100–110 dB at source. In our recording loudness is reduced to a background 55–60 dB so the sound can be used as reference or sound-design element without hearing risk. The sound was deliberately designed by automotive engineers in the 1970s as "maximally attention-grabbing": the 2–4 kHz band coincides with the human ear's peak sensitivity (Fletcher–Munson contours, 1933), and rapid alternation between tones prevents habituation.
The psychoacoustics is well studied: Halpern (Journal of the Acoustical Society of America, 1986) showed that any sound with sharp attack and periodic repetition in the 1–4 kHz band triggers rapid sympathetic arousal even in people without a car. This is an evolutionary legacy — a pulsating high-frequency signal in nature meant "danger nearby." Modern urban planners have long sought to replace car alarms with less aggressive signals; the old model still dominates.
Use this track sparingly: for sound design (as an "urban stressor" reference), for writing night-city scenes, for podcasts about urban noise, and for "contrast" therapy (a sharp shift from loud peaks to silence or nature). Pairs with Traffic Jam, Emergency Sirens, City Noise. Categorically not for sleep, meditation, concentration or any extended task — this is an "acute stress" sound by physiological function.
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ReduxSound v1.0.0
Ambient sound mixer for relaxation and focus