sound pressure level
Học thuậtThân thiện
Definition
- Noun:
- A logarithmic measure of the effective pressure of a sound relative to a reference value: It quantifies the intensity of a sound wave, expressed in decibels (dB). It is a specific, measurable physical quantity used in acoustics.
Usage
- The term "sound pressure level" is used in technical, scientific, and regulatory contexts to describe and compare the loudness or intensity of sounds in an objective, physical manner.
- It is typically measured with a sound level meter and reported in decibels (dB SPL).
Examples
- Noun:
- The sound pressure level in the factory exceeded 85 dB, requiring hearing protection.
- Regulations specify a maximum permissible sound pressure level for residential areas at night.
- The engineer measured the sound pressure level of the new engine to ensure it met design specifications.
Advanced Usage
- "A-weighted sound pressure level" (dBA): A common variation where the measurement is adjusted to reflect the frequency sensitivity of the human ear, often used in environmental and occupational noise assessments.
- The ordinance limits the A-weighted sound pressure level from construction sites to 75 dBA during daytime hours.
Variants and Related Words
- Sound Level: Often used interchangeably with "sound pressure level" in non-technical contexts, though "sound level" can be more general.
- SPL: A common abbreviation for "sound pressure level."
- Decibel (dB): The unit of measurement for sound pressure level and other logarithmic ratios.
Synonyms
- Acoustic Pressure Level: A less common but technically accurate synonym.
- Sound Intensity Level: A related but distinct logarithmic measure of sound power per unit area. While related, "sound pressure level" and "sound intensity level" are numerically equal only under specific conditions (e.g., in a free field).
Related Phrases
- Peak Sound Pressure Level: The maximum instantaneous sound pressure level reached during a specific time interval.
- The peak sound pressure level of the explosion was recorded at 140 dB.
- Equivalent Continuous Sound Pressure Level (Leq): The constant sound pressure level that would deliver the same total acoustic energy as the fluctuating sound measured over a given period.
- The Leq over an 8-hour workday was calculated to assess worker noise exposure.
Noun
- the physical intensity of sound