L1 ⚛ L1-271 ⊙ Testnet

Outdoor Noise Propagation — atmospheric refraction + ground effect

Acoustics · Outdoor sound propagation (ISO 9613 / PE)

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⬇ L1-271.md

# ⚛ L1 Principle — Outdoor Noise Propagation — atmospheric refraction + ground effect **ID:** `L1-271` · **Status:** ⊙ Testnet (genesis catalog) > **🌐 Domain:** Acoustics — *Outdoor sound propagation (ISO 9613 / PE)* > **🎯 Problem class:** linear inverse · **🧮 Solution space:** transmission loss 3D > **📡 Carrier:** acoustic · **🌫 Noise:** gaussian > **⚖ Difficulty (δ):** 5 · **⛓ Block:** 41554050 --- ## 🧠 1. Introduction **Outdoor Noise Propagation — atmospheric refraction + ground effect** is a **linear inverse problem** whose unknown lives in **transmission loss 3D** space, within the **Outdoor sound propagation (ISO 9613 / PE)** sub-domain of **Acoustics**. Measurements consist of acoustic pressure waves recorded by transducers via a **far field mic** sensing mechanism. The forward operator applies, in order: isotropic point-source emission model; L · atmos absorb operator; L · ground reflect operator; L · diffract · barrier operator; int · range operator. Observations are corrupted by additive Gaussian noise. Conditional stability; mismatch parameters dominate at Omega bounds. ## ⚙ 2. Forward Model Physical chain: **x** → Source emission → L · atmos absorb → L · ground reflect → L · diffract · barrier → int · range → **y** (detector). ``` y = `int.range` `L.diffract.barrier` `L.ground_reflect` `L.atmos_absorb` δ_source x + n, n ~ 𝒩(0, σ²) ``` **Measurement DAG:** | Primitive | What it does | |---|---| | `L.source_emit` | Isotropic point-source emission model | | `L.atmos_absorb` | L · atmos absorb operator | | `L.ground_reflect` | L · ground reflect operator | | `L.diffract.barrier` | L · diffract · barrier operator | | `int.range` | Int · range operator | ## 🔬 3. Physics Fingerprint | Property | Value | |---|---| | Domain | Acoustics | | Sub domain | Outdoor sound propagation (ISO 9613 / PE) | | Carrier | acoustic | | Problem class | linear_inverse | | Solution space | transmission_loss_3D | | Noise model | gaussian | | Integration axis | range | | Difficulty delta | 5 | | L dag | 3.7 | ## 📡 4. Measurement Model Conditional stability; mismatch parameters dominate at Omega bounds. | Metric | Value | |---|---| | Metric | SPL_error_dB | | Secondary | SSIM | ## 📏 5. Operating Range (Ω) **Center problem class:** `outdoor_propagation` · **Forward operator:** `outdoor_propagation_forward` **Center point:** | Parameter | Unit | Value | |---|---|---| | Snr db | dB | 20 | | Freq hz | Hz | 500 | | R max m | m | 1000 | | N stations | — | 16 | | Terrain error | — | 0.1 | | Temp profile error | — | 0.1 | | Wind profile error | — | 0.05 | | Ground impedance error | — | 0.1 | **Allowed bounds:** | Parameter | Unit | Range | |---|---|---| | Snr db | dB | -10 – 40 | | Freq hz | Hz | 20 – 10000 | | R max m | m | 50 – 20000 | | N stations | — | 4 – 128 | | Terrain error | — | 0.0 – 0.3 | | Temp profile error | — | 0.0 – 0.3 | | Wind profile error | — | 0.0 – 0.5 | | Ground impedance error | — | 0.0 – 0.5 | ## 🎯 6. Tolerance (ε) **Center tolerance:** 3.0 | Metric | Range | |---|---| | Spl db | 0.5 – 25.0 | ## ⚖ 7. Hardness Function Hardness scales as **`epsilon_fn`** on **SPL_error_dB**, with κ = `700` and δ = `5`. ## 💾 8. Reference Dataset - **primary** · weight 1.0 · IPFS _(not pinned yet)_ ## 9. On-chain Registration - **Chain hash:** `0x952b42579d80049313a9269f6deb0a33ecf06315636e8d82d36c922b145c3d08` - **Chain tx hash:** `0x5efbba5d82298f33f40d34a5ad0c77740149abe0659b145a66f4fe5c005b9f65` - **Chain block:** `41554050` --- ## File Mapping This bundle consists of: `L1-271.md`, `L1-271.json`. | File | Role | How to regenerate | |------|------|-------------------| | `L1-271.md` | Source of truth — edit this | Human or LLM | | `L1-271.json` | Structured metadata for the registry | LLM regenerates from the sections above | **Prompt for your LLM after editing this Markdown:** > Read the attached Markdown. Regenerate the sibling `.json` so every field matches. > Preserve the schema documented in the rows above. > Output each file in its own fenced code block tagged with the filename. > Output only the JSON object. _This Markdown was auto-synthesized from the catalog row for `L1-271`._ _Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._

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Read the attached Markdown (L1-271.md).
Regenerate L1-271.json so every field matches the Markdown.
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L2-271-001 Outdoor Noise Propagation — atmospheric refraction + ground effect Mismatch-Only Spec

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📋 JSON metadata

{
  "artifact_id": "L1-271",
  "chain_block": 41554050,
  "chain_hash": "0x952b42579d80049313a9269f6deb0a33ecf06315636e8d82d36c922b145c3d08",
  "chain_tx_hash": "0x5efbba5d82298f33f40d34a5ad0c77740149abe0659b145a66f4fe5c005b9f65",
  "domain": "Acoustics",
  "hardness_fn": {
    "delta": 5,
    "kappa": 700,
    "metric": "SPL_error_dB",
    "type": "epsilon_fn"
  },
  "initiator_dataset": [
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      "license_hash": null,
      "name": "primary",
      "weight": 1.0
    }
  ],
  "layer": "L1",
  "observable_profile": {
    "metric": "SPL_error_dB",
    "regime": "Conditional stability; mismatch parameters dominate at Omega bounds.",
    "secondary": "SSIM"
  },
  "physics_fingerprint": {
    "L_DAG": 3.7,
    "carrier": "acoustic",
    "difficulty_delta": 5,
    "domain": "Acoustics",
    "integration_axis": "range",
    "noise_model": "gaussian",
    "primitives": [
      "L.source_emit",
      "L.atmos_absorb",
      "L.ground_reflect",
      "L.diffract.barrier",
      "int.range"
    ],
    "problem_class": "linear_inverse",
    "sensing_mechanism": "far_field_mic",
    "solution_space": "transmission_loss_3D",
    "sub_domain": "Outdoor sound propagation (ISO 9613 / PE)",
    "title": "Outdoor Noise Propagation \u2014 atmospheric refraction + ground effect"
  },
  "size_tiers": {
    "allowed_forward_operators": [
      "outdoor_propagation_forward"
    ],
    "allowed_omega_dimensions": [
      "r_max_m",
      "N_stations",
      "freq_Hz",
      "SNR_dB",
      "wind_profile_error",
      "temp_profile_error",
      "ground_impedance_error",
      "terrain_error",
      "wind_profile_error",
      "temp_profile_error",
      "ground_impedance_error",
      "terrain_error"
    ],
    "allowed_problem_classes": [
      "outdoor_propagation"
    ],
    "center_spec": {
      "epsilon_fn_center": "3.0",
      "forward_operator": "outdoor_propagation_forward",
      "input_format": "measurement_only",
      "omega": {
        "N_stations": 16,
        "SNR_dB": 20,
        "freq_Hz": 500,
        "ground_impedance_error": 0.1,
        "r_max_m": 1000,
        "temp_profile_error": 0.1,
        "terrain_error": 0.1,
        "wind_profile_error": 0.05
      },
      "problem_class": "outdoor_propagation"
    },
    "epsilon_bounds": {
      "SPL_dB": [
        0.5,
        25.0
      ]
    },
    "omega_bounds": {
      "N_stations": [
        4,
        128
      ],
      "SNR_dB": [
        -10,
        40
      ],
      "freq_Hz": [
        20,
        10000
      ],
      "ground_impedance_error": [
        0.0,
        0.5
      ],
      "r_max_m": [
        50,
        20000
      ],
      "temp_profile_error": [
        0.0,
        0.3
      ],
      "terrain_error": [
        0.0,
        0.3
      ],
      "wind_profile_error": [
        0.0,
        0.5
      ]
    }
  },
  "staked_pwm": 0.0,
  "status": "testnet",
  "sub_domain": "Outdoor sound propagation (ISO 9613 / PE)",
  "title": "Outdoor Noise Propagation \u2014 atmospheric refraction + ground effect"
}

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