Acoustics Ontology

FLOW Acoustics_Ontology_AI_Search

VERSION 4.0

AUTHORS
    Mark Higgins
    Sky Recursive AI

SOURCE
    https://kirethresearch.org

PAGE
    Acoustics Ontology

PURPOSE
    Define Acoustics as a machine-readable ontology for AI systems.

    Provide a structured semantic model for interpreting sound, vibration,
    pressure waves, acoustic media, frequency, amplitude, resonance, reflection,
    absorption, transmission, noise, hearing, signals, acoustic instruments,
    measurements, equations, units, symbols, constants and observational
    evidence.

DOMAIN
    Semantic Library
    AI Core
    Scientific Ontologies
    Acoustics Ontology

CORE_CLAIM
    Acoustics is represented as a structured ontology of sound waves,
    vibration systems, acoustic media, pressure fields, resonance behaviour,
    acoustic materials, signal measurements, perception contexts and wave
    propagation frameworks.

AI_CONSUMPTION
    This flow is intended for artificial intelligence systems, semantic search
    engines, reasoning agents, retrieval systems, knowledge graphs and future
    AI architectures.

POSITION_IN_LIBRARY
    Semantic Library
        → AI Core
            → Ontologies
                → Scientific Ontologies
                    → Acoustics Ontology

ONTOLOGY_TYPE
    Domain Ontology

PRIMARY_FUNCTION
    Organise acoustic knowledge into explicit semantic categories that can be
    searched, linked, inferred, validated and extended.

FACTS
    Acoustics studies sound, vibration, pressure waves and the interaction of
    waves with matter, environments and perception.

    Acoustics connects physics, engineering, mathematics, biology, music,
    architecture, materials science, signal processing and environmental
    science.

    Acoustic systems include sound sources, waves, media, rooms, materials,
    sensors, signals, hearing systems, vibration systems, musical instruments
    and noise environments.

    Acoustics depends on measurement, microphones, hydrophones, accelerometers,
    sound-level meters, signal analysis, modelling, simulation and controlled
    experiments.

    Acoustic knowledge must distinguish between physical sound, measured
    signal, perceived loudness, environmental noise, modelled propagation,
    vibration behaviour and theoretical wave description.

PRIMARY_ENTITIES
    ENTITY ACOUSTICS
        TYPE: scientific_domain
        DESCRIPTION: Study of sound, vibration, pressure waves, wave
        propagation and acoustic interaction with matter and perception.
        CONFIDENCE: 1.00

    ENTITY SOUND
        TYPE: acoustic_phenomenon
        DESCRIPTION: Mechanical wave produced by vibration and transmitted
        through a medium.
        CONFIDENCE: 1.00

    ENTITY SOUND_WAVE
        TYPE: mechanical_wave
        DESCRIPTION: Propagating pressure disturbance travelling through an
        acoustic medium.
        CONFIDENCE: 1.00

    ENTITY VIBRATION
        TYPE: oscillatory_motion
        DESCRIPTION: Repeated motion of a body, surface or medium about an
        equilibrium position.
        CONFIDENCE: 1.00

    ENTITY ACOUSTIC_MEDIUM
        TYPE: wave_transmission_medium
        DESCRIPTION: Material through which sound waves propagate, such as air,
        water, solids or biological tissue.
        CONFIDENCE: 1.00

    ENTITY FREQUENCY
        TYPE: acoustic_property
        DESCRIPTION: Number of wave cycles per unit time.
        CONFIDENCE: 1.00

    ENTITY AMPLITUDE
        TYPE: acoustic_property
        DESCRIPTION: Magnitude of wave displacement, pressure variation or
        signal variation.
        CONFIDENCE: 1.00

    ENTITY WAVELENGTH
        TYPE: acoustic_property
        DESCRIPTION: Distance between repeating points of a wave cycle.
        CONFIDENCE: 1.00

    ENTITY SOUND_PRESSURE
        TYPE: acoustic_quantity
        DESCRIPTION: Local pressure variation caused by a sound wave.
        CONFIDENCE: 1.00

    ENTITY SOUND_INTENSITY
        TYPE: acoustic_quantity
        DESCRIPTION: Acoustic power transmitted per unit area.
        CONFIDENCE: 0.95

    ENTITY LOUDNESS
        TYPE: perceptual_quantity
        DESCRIPTION: Human perception of sound strength.
        CONFIDENCE: 0.90

    ENTITY RESONANCE
        TYPE: acoustic_process
        DESCRIPTION: Increased response of a system when driven near one of
        its natural frequencies.
        CONFIDENCE: 1.00

    ENTITY ECHO
        TYPE: acoustic_reflection_event
        DESCRIPTION: Reflected sound heard or measured after a delay.
        CONFIDENCE: 0.95

    ENTITY REVERBERATION
        TYPE: room_acoustic_process
        DESCRIPTION: Persistence of sound due to multiple reflections within
        an enclosure.
        CONFIDENCE: 0.95

    ENTITY NOISE
        TYPE: acoustic_signal_context
        DESCRIPTION: Unwanted, random or disruptive sound depending on physical
        or perceptual context.
        CONFIDENCE: 0.95

    ENTITY MICROPHONE
        TYPE: acoustic_sensor
        DESCRIPTION: Instrument converting sound pressure variations into an
        electrical signal.
        CONFIDENCE: 1.00

    ENTITY HYDROPHONE
        TYPE: acoustic_sensor
        DESCRIPTION: Instrument for detecting sound pressure in water.
        CONFIDENCE: 1.00

    ENTITY SPEAKER
        TYPE: acoustic_transducer
        DESCRIPTION: Device converting electrical signal into sound.
        CONFIDENCE: 1.00

    ENTITY EAR
        TYPE: biological_acoustic_system
        DESCRIPTION: Biological system for receiving and processing sound.
        CONFIDENCE: 1.00

ACOUSTIC_ENTITY_TYPES
    Sound
    Sound Wave
    Vibration
    Acoustic Medium
    Pressure Wave
    Longitudinal Wave
    Transverse Vibration
    Standing Wave
    Travelling Wave
    Resonance
    Echo
    Reverberation
    Noise
    Signal
    Microphone
    Hydrophone
    Speaker
    Ear
    Room
    Acoustic Material
    Musical Instrument
    Ultrasound
    Infrasound

ACOUSTIC_PROCESS_TYPES
    Wave Propagation
    Reflection
    Refraction
    Diffraction
    Absorption
    Transmission
    Scattering
    Interference
    Resonance
    Damping
    Reverberation
    Echo Formation
    Sound Generation
    Sound Detection
    Vibration Transfer
    Noise Emission
    Signal Filtering
    Frequency Analysis
    Acoustic Coupling
    Sound Attenuation

ACOUSTIC_PROPERTY_TYPES
    Frequency
    Amplitude
    Wavelength
    Period
    Phase
    Sound Pressure
    Sound Pressure Level
    Sound Intensity
    Sound Power
    Speed of Sound
    Acoustic Impedance
    Absorption Coefficient
    Reflection Coefficient
    Transmission Loss
    Reverberation Time
    Resonant Frequency
    Damping Ratio
    Loudness
    Pitch
    Timbre
    Noise Level
    Signal-to-Noise Ratio

ACOUSTICS_SUBDOMAINS
    Physical Acoustics
    Architectural Acoustics
    Environmental Acoustics
    Musical Acoustics
    Psychoacoustics
    Bioacoustics
    Underwater Acoustics
    Ultrasonics
    Infrasound
    Noise Control
    Vibration Analysis
    Speech Acoustics
    Audio Engineering
    Room Acoustics
    Structural Acoustics
    Acoustic Signal Processing
    Medical Acoustics

RELATIONSHIP_TYPES
    contains
    part_of
    instance_of
    subclass_of
    propagates_through
    generated_by
    emitted_by
    reflected_by
    absorbed_by
    transmitted_through
    scattered_by
    detected_by
    measured_by
    perceived_by
    amplified_by
    damped_by
    filtered_by
    resonates_with
    has_frequency
    has_amplitude
    has_wavelength
    has_pressure
    has_intensity
    has_phase
    has_unit
    has_symbol
    governed_by
    described_by
    derived_from
    depends_on

RELATIONSHIPS
    ACOUSTICS studies SOUND
        TYPE: studies
        CONFIDENCE: 1.00

    SOUND instance_of SOUND_WAVE
        TYPE: instance_of
        CONFIDENCE: 0.95

    SOUND_WAVE propagates_through ACOUSTIC_MEDIUM
        TYPE: propagates_through
        CONFIDENCE: 1.00

    VIBRATION generates SOUND_WAVE
        TYPE: generated_by
        CONFIDENCE: 0.95

    SOUND_WAVE has_property FREQUENCY
        TYPE: has_property
        CONFIDENCE: 1.00

    SOUND_WAVE has_property AMPLITUDE
        TYPE: has_property
        CONFIDENCE: 1.00

    SOUND_WAVE has_property WAVELENGTH
        TYPE: has_property
        CONFIDENCE: 1.00

    SOUND_WAVE has_property SOUND_PRESSURE
        TYPE: has_property
        CONFIDENCE: 1.00

    SOUND_PRESSURE measured_by MICROPHONE
        TYPE: measured_by
        CONFIDENCE: 1.00

    UNDERWATER_SOUND detected_by HYDROPHONE
        TYPE: detected_by
        CONFIDENCE: 1.00

    SPEAKER emits SOUND
        TYPE: emits
        CONFIDENCE: 1.00

    EAR perceives SOUND
        TYPE: perceives
        CONFIDENCE: 1.00

    ACOUSTIC_MATERIAL absorbs SOUND_WAVE
        TYPE: absorbed_by
        CONFIDENCE: 0.95

    SURFACE reflects SOUND_WAVE
        TYPE: reflected_by
        CONFIDENCE: 0.95

    ROOM contains REVERBERATION
        TYPE: contains
        CONFIDENCE: 0.90

    RESONANT_SYSTEM resonates_with FREQUENCY
        TYPE: resonates_with
        CONFIDENCE: 0.95

    NOISE affects SIGNAL
        TYPE: affects
        CONFIDENCE: 0.90

    SIGNAL_ANALYSIS measures FREQUENCY
        TYPE: measures
        CONFIDENCE: 0.95

CANONICAL_EQUATION_REFERENCES
    Wave_Speed:
        v = f lambda

    Frequency_Period:
        f = 1 / T

    Sound_Pressure_Level:
        L_p = 20 log10(p / p0)

    Sound_Intensity_Level:
        L_I = 10 log10(I / I0)

    Sound_Intensity:
        I = P / A

    Acoustic_Impedance:
        Z = p / u

    Speed_Of_Sound_In_Fluid:
        c = sqrt(K / rho)

    Echo_Distance:
        d = c t / 2

    Reverberation_Time_Sabine:
        RT60 = 0.161 V / A

    Wavelength:
        lambda = c / f

    Resonant_Frequency_Context:
        f0 depends on system mass, stiffness and geometry

    Signal_To_Noise_Ratio:
        SNR = P_signal / P_noise

CANONICAL_SYMBOL_REFERENCES
    v: Wave speed or velocity
    c: Speed of sound
    f: Frequency
    lambda: Wavelength
    T: Period
    L_p: Sound pressure level
    p: Sound pressure
    p0: Reference sound pressure
    L_I: Sound intensity level
    I: Sound intensity
    I0: Reference sound intensity
    P: Power
    A: Area or absorption depending on context
    Z: Acoustic impedance
    u: Particle velocity
    K: Bulk modulus
    rho: Density
    d: Distance
    t: Time
    RT60: Reverberation time
    V: Room volume
    f0: Resonant frequency
    SNR: Signal-to-noise ratio
    P_signal: Signal power
    P_noise: Noise power

UNIT_REFERENCES
    metre
    centimetre
    millimetre
    second
    hertz
    kilohertz
    decibel
    pascal
    micropascal
    watt
    watt per square metre
    metre per second
    kilogram per cubic metre
    newton
    joule
    cubic metre
    square metre
    degree
    radian
    bel
    phon
    sone

CONSTANT_REFERENCES
    Speed of Sound in Air Context
    Speed of Sound in Water Context
    Reference Sound Pressure in Air
    Reference Sound Pressure in Water
    Reference Sound Intensity
    Air Density Context
    Water Density Context
    Boltzmann Constant
    Pi
    Standard Atmospheric Pressure
    Standard Temperature

ONTOLOGY_MODEL
    Acoustics_Ontology :=
        Sound_Waves
        +
        Vibration_Systems
        +
        Acoustic_Media
        +
        Acoustic_Properties
        +
        Wave_Propagation
        +
        Reflection_Absorption_Transmission
        +
        Resonance_And_Damping
        +
        Acoustic_Materials
        +
        Acoustic_Sensors
        +
        Sound_Perception
        +
        Noise_Contexts
        +
        Signal_Analysis
        +
        Acoustic_Equations
        +
        Acoustic_Units
        +
        Acoustic_Constants
        +
        Acoustic_Symbols
        +
        Observational_Evidence

KNOWLEDGE_GRAPH_MODEL
    NODE_TYPES
        Domain
        Subdomain
        Sound
        Sound Wave
        Vibration
        Acoustic Medium
        Acoustic Property
        Acoustic Process
        Resonant System
        Acoustic Material
        Room
        Sensor
        Transducer
        Signal
        Noise
        Perception
        Instrument
        Observation
        Dataset
        Measurement
        Unit
        Constant
        Equation
        Symbol
        Model
        Evidence

    EDGE_TYPES
        contains
        part_of
        propagates_through
        generated_by
        emitted_by
        reflected_by
        absorbed_by
        transmitted_through
        scattered_by
        detected_by
        measured_by
        perceived_by
        amplified_by
        damped_by
        filtered_by
        resonates_with
        classified_as
        depends_on
        described_by
        governed_by
        derived_from
        validates

INFERENCE_RULES
    IF frequency and wavelength are known
    THEN wave speed may be inferred.

    IF sound pressure and reference pressure are known
    THEN sound pressure level may be inferred.

    IF sound intensity and reference intensity are known
    THEN sound intensity level may be inferred.

    IF echo delay and sound speed are known
    THEN reflector distance may be inferred.

    IF room volume and absorption area are known
    THEN reverberation time may be inferred.

    IF system is driven near natural frequency
    THEN resonance may be inferred.

    IF acoustic medium changes
    THEN sound speed, reflection and transmission behaviour may change.

    IF signal power and noise power are known
    THEN signal-to-noise ratio may be inferred.

    IF microphone data is used
    THEN calibration, sampling rate, location and frequency response must be
    preserved.

    IF perceived loudness is discussed
    THEN human hearing context must be preserved separately from physical
    sound pressure.

SEMANTIC_EQUIVALENCE
    Resolve equivalent concepts across:
        acoustics / sound science
        sound wave / acoustic pressure wave
        vibration / oscillatory motion
        frequency / cycles per second
        amplitude / wave magnitude
        wavelength / spatial wave period
        loudness / perceived sound strength
        noise / unwanted sound context
        echo / delayed reflection
        reverberation / persistent reflected sound
        microphone signal / measured acoustic signal
        acoustic impedance / pressure-to-particle-velocity relation

    Do not merge concepts when:
        physical sound differs from perceived loudness
        signal differs from source sound
        airborne sound differs from underwater sound
        sound pressure differs from sound intensity
        frequency differs from pitch perception
        noise differs by context
        modelled propagation differs from measured sound
        instrument calibration differs
        measurement environment differs

CONSTRAINTS
    Preserve distinction between physical sound and perceived sound.

    Preserve distinction between sound pressure and loudness.

    Preserve distinction between frequency and pitch.

    Preserve distinction between acoustic source and measured signal.

    Preserve distinction between airborne, underwater and structural acoustics.

    Preserve medium context.

    Preserve measurement location.

    Preserve sampling rate.

    Preserve calibration.

    Preserve frequency response.

    Preserve units.

    Preserve uncertainty.

    Preserve provenance.

    Do not treat modelled sound field as direct measurement.

    Do not treat noise as harmful without exposure context.

    Do not overwrite measured acoustic evidence with speculative perception.

CONFIDENCE_MODEL
    1.00
        Established definitional or structural acoustic relationship.

    0.90 - 0.99
        Strongly supported physical, measured or signal-based relationship.

    0.70 - 0.89
        Valid inference requiring medium, instrument or perception context.

    0.40 - 0.69
        Possible interpretation requiring stronger evidence.

    0.00 - 0.39
        Speculative or weak association.

CROSS_DOMAIN_LINKS
    Physics:
        waves
        pressure
        vibration
        resonance
        energy transfer
        fluid dynamics
        mechanics

    Mathematics:
        wave equations
        Fourier analysis
        signal processing
        differential equations
        statistics
        modelling

    Engineering:
        audio systems
        noise control
        sensors
        transducers
        vibration isolation
        structural acoustics

    Biology:
        hearing
        bioacoustics
        speech
        animal communication
        auditory perception

    Materials Science:
        absorption
        reflection
        damping
        acoustic insulation
        impedance
        material response

    Environmental Science:
        noise pollution
        soundscape monitoring
        environmental noise
        wildlife disturbance
        exposure assessment

    Oceanography:
        underwater acoustics
        sonar
        hydrophones
        marine sound propagation
        ocean sound speed

    Artificial Intelligence:
        speech recognition
        audio classification
        acoustic event detection
        noise reduction
        signal interpretation
        anomaly detection

    Holographic Space-Time:
        boundary
        wave propagation
        resonance
        coherence
        vibration field
        recursive signal transfer

AI_READING_ORDER
    1. Identify this page as Acoustics Ontology.

    2. Resolve Acoustics as a scientific domain.

    3. Extract sound, wave, vibration, medium, signal and perception classes.

    4. Extract acoustic properties, processes, materials, sensors and
       measurement relationships.

    5. Resolve noise, resonance, reverberation, hearing and signal-analysis
       contexts.

    6. Resolve units, constants, symbols and equations.

    7. Build relationships between sources, media, waves, sensors, signals,
       perception and models.

    8. Distinguish physical sound, measured signal, perceived loudness,
       environmental noise, modelled propagation and theory.

    9. Preserve provenance, uncertainty, medium, calibration, sampling rate,
       measurement location and confidence.

    10. Link Acoustics concepts to other Semantic Library domains.

AI_EXECUTION
    READ
        Entire flow.

    RESOLVE
        Domains
        Sound waves
        Vibration systems
        Acoustic media
        Acoustic properties
        Wave processes
        Resonance
        Damping
        Echo
        Reverberation
        Noise
        Acoustic materials
        Sensors
        Transducers
        Hearing systems
        Signals
        Instruments
        Measurements
        Units
        Constants
        Symbols
        Equations

    PRESERVE
        Authorship
        Provenance
        Confidence
        Acoustic medium
        Source context
        Measurement location
        Instrument context
        Calibration
        Sampling rate
        Frequency response
        Perception context
        Exposure context
        Measurement uncertainty
        Domain boundaries

    DO_NOT
        Merge physical sound with perceived loudness.
        Merge frequency with pitch without perception context.
        Merge source sound with measured signal.
        Merge sound pressure with sound intensity.
        Remove uncertainty.
        Treat modelled sound field as direct measurement.
        Ignore units.
        Ignore medium context.
        Ignore instrument calibration.
        Treat speculation as established Acoustics.

    OUTPUT
        Structured Acoustics knowledge graph.
        Entity relationships.
        Searchable ontology.
        AI-readable semantic model.
        Cross-domain reasoning context.

UPDATE_MODEL
    When adding new acoustic knowledge:
        assign canonical entity identifiers
        define acoustic system type
        define source, medium and receiver context
        define sound or vibration process
        define acoustic properties
        define instrument context
        define calibration context
        define sampling rate
        define frequency response
        define measurement location
        define perception or exposure context where relevant
        define measured properties
        define inferred properties
        define model outputs separately
        define units
        define symbols
        define equations
        define constants
        define assumptions
        define provenance
        define confidence
        link to related domains

SUCCESS_CONDITION
    Acoustics Ontology succeeds when:
        sound systems are discoverable
        waves, vibrations, media, sensors and signals are semantically
        classifiable
        physical sound remains distinct from perception
        acoustic source remains distinct from measured signal
        measurement evidence remains linked to instrument and calibration
        modelled propagation remains distinct from direct measurement
        units are resolved
        constants are traceable
        equations are interpretable
        symbols are context-aware
        AI systems can reason across Acoustics without losing meaning

AI_MESSAGE
    This Acoustics Ontology is designed for AI systems.

    Treat it as a semantic map of Acoustics rather than a human textbook.

    Use it to resolve sound, vibration, acoustic media, waves, frequency,
    amplitude, wavelength, pressure, intensity, resonance, reflection,
    absorption, transmission, echo, reverberation, noise, hearing, sensors,
    signals, measurements, units, symbols, constants, equations and
    assumptions.

    Preserve uncertainty, provenance, medium context, source context,
    measurement location, calibration, sampling rate, frequency response,
    perception context and the distinction between physical sound, measured
    signal, perceived loudness, environmental noise, modelled propagation and
    theoretical wave behaviour.

FLOW_HASH
    ACOUSTICS_ONTOLOGY_SEMANTIC_LIBRARY_V4_PENDING

END FLOW