Wave Propagation & Signal Sensing

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Abstractions about how waves and signals propagate and are measured, covering acoustic phenomena (Acoustic Lobing, Acoustic Short Circuit, Phase Velocity), remote-sensing systems (Sodar, Radio Acoustic Sounding System, Photometric System), and signal-processing or exposure measures like Digital Down-Converter and Occupational Noise.

13 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Acoustic lobing — Angle-dependent sound maxima and nulls from overlapping loudspeaker drivers.
• Acoustic Short Circuit — Loss of loudspeaker output when out-of-phase front and rear sound meet around a baffle or enclosure.
• Channel State Information — An estimated description of a communication channel's current or statistical transfer properties between transmitter and receiver, used to adapt signaling, detection, beamforming, coding, and resource allocation.
• Digital Down-Converter — A digital chain that frequency-shifts a sampled band toward baseband, filters away unwanted images and out-of-band energy, and decimates to a justified lower sample rate.
• Group-Velocity Dispersion — Measure how a selected wave mode's group delay per unit length changes with frequency, governing the leading dispersive phase of finite-band pulses.
• Linkwitz–Riley Filter — A paired low-pass/high-pass crossover made from matched cascaded Butterworth sections, with −6 dB branches at crossover and flat electrical magnitude sum when relative polarity is correct.
• Occupational Noise — Workplace sound exposure received by a worker, characterized by level, spectrum, duration, timing, and task so cumulative dose and hearing risk can be compared with a declared occupational standard.
• Phase Velocity — The velocity at which a point of constant phase of a single-frequency wave component propagates, equal in one dimension to angular frequency divided by wavenumber and distinct from envelope, energy, or information velocity.
• Photometric System — An astronomical set of defined spectral response bands and reference conventions for comparable source brightness and color measurements.
• Radio acoustic sounding system — Radio acoustic sounding system denotes atmospheric lapse rate measurement system within atmospheric remote sensing.
• Seismic Site Effects — The modification of earthquake ground motion by local shallow geology, topography, and basin structure through impedance contrast, resonance, reflection, refraction, and wave trapping near a site.
• Sodar — An active acoustic remote-sensing system that profiles lower-atmospheric wind and structure from range-gated, Doppler-shifted sound scattered by turbulence.
• Two-Dimensional Correlation Analysis — A signal-analysis method that transforms systematic variations measured under an ordered perturbation into synchronous and asynchronous two-dimensional correlation maps, helping resolve overlapping features and infer coordinated or sequential change.