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    TRISHA ROBINOS

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    Rev Acc 4pwpic

    Uploaded by

    TRISHA ROBINOS
    4 views4 pages

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    4 views4 pages

    Rev Acc 4pwpic

    Uploaded by

    TRISHA ROBINOS

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 4

    Background Noise The minimum sound pressure capable of

    stimulating an auditory sensation,


    The sound normally present in an
    usually at 0dB.
    environment. It is usually a composite of
    sounds from both exterior and interior Threshold of Pain
    sources where none of which are
    The level of sound intensity high enough
    distinctly identifiable to the listener. It is
    to produce the sensation of pain in the
    also called Ambient Sound.
    human ear, usually around 130dB.
    Impact Noise
    Auditory Fatigue
    A structure-borne sound generated by
    Physical and mental weariness caused
    physical impact, as perceived from
    by prolonged exposure to loud noises.
    footsteps or from moving the furniture.
    Pitch
    White Noise
    It is the predominant frequency of a
    An unvarying, unobtrusive
    sound perceived by human ear.
    (unremarkable) sound having the same
    intensity for all frequencies of a given FREQUENCY (f)
    band. It is used to mask or obliterate
    unwanted sound. It is also known as The number of cycles (sound ripples)
    white sound. that the air particles move back and
    forth generated in unit time (in one
    INTENSITY second) in a sound wave is called the
    frequency of the wave. Its unit is cycles
    Threshold of Hearing
    per second (c/s) which is also termed
    Hertz (Hz) after the Austrian physicist
    Heinrich Hertz (1857-94).
    WAVELENGTH (λ) Lighting designed to provide a
    uniform level of illumination throughout
    The distance, measured in the direction
    an area.
    of the propagation of a wave, from any
    one point to the next point of LOCAL LIGHTING
    corresponding phase.
    Lighting designed to provide a
    Wave relatively high level of illumination over
    a small area with surrounding area of
    A disturbance or oscillation that
    lower intensity from spill light.
    transfers energy from point to point in a
    medium or space without advance by the TASK LIGHTING
    points themselves, as in the transmission
    Lighting designed to provide
    of sound or light.
    strong illumination for visually
    Sound Wave demanding activity, such as drafting or
    reading
    A longitudinal pressure wave in an air or
    an elastic medium producing an audible ACCENT LIGHTING
    sensation.
    Lighting that calls attention to a
    Daylighting is the practice of placing particular object or feature in the visual
    windows or other openings and field, or that forms decorative pattern on
    reflective surfaces so that during the day a surface.
    natural light provides effective internal
    DIRECT LIGHTING
    lighting.
    Lighting in which luminaires distribute
    GENERAL LIGHTING
    90%-100% of the emitted light
    downward on the surface or area to be
    illuminated
    .
    SEMI-DIRECT LIGHTING especially to avoid glare or prevent
    shadows.
    Lighting in which luminaires distribute
    60%-90% of the emitted light Luminaire is a lighting unit consisting
    downward. of one or more electric lamps with all of
    the necessary parts and wiring for
    INDIRECT LIGHTING
    positioning and protecting the lamps,
    Lighting in which luminaires distribute connecting the lamps to a power supply
    90%-100% of the emitted light upward, and distributing the light.

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