Definitions for **"SOUND PRESSURE LEVEL"**

The intensity or level of sound (measured on the dB scale).

This can also be referred to as the sound amplitude and is the pressure exerted by the air. It is usually measured in microPascals but can be converted into decibels (dB).

A-weighted sound pressure level at a certain distance from the source

The intensity of a sound wave which, in decibels, equals 20 log (PslPr), where Ps is the pressure produced by the sound and Pr is a stated reference pressure.

Measure used to indicate the loudness of a sound in air. Defined as actual sound pressure referenced to 20mPa2.See also: dB, dBA.

Ln, w' : Laboratory measurement of the impact noise level through a floor ; expressed in dB.

The power level of sound being the sound pressure squared, referenced to 20 mPa2 measured in dB. Commonly, how loud the sound is measured in decibels. Speech is around 70-80 dB at three feet. Normal background noise on average is 50-60dB. 120dB is the threshold of pain. 200dB is 50lbs of TNT detonated 10 feet away.

Given in decibels (dB), it is 20 times the logarithm to the base 10 of the ratio of a given sound pressure to the reference sound pressure, which is 20 micropascals (mPa) for airborne sound. The sound pressure is the root mean square value of the instantaneous sound pressure over a given time interval (IEC 84).

A standard measurement of the amplitude of sound, expressed as the ratio in decibels between the measured sound pressure and standard reference of 0 dB SPL = 20 microPascals = 0.0002 dynes/cm2.

Pressure generated by a sound wave measured on a logarithmic scale and expressed relative to the human threshold at 1kHz

A sound pressure expression in dB above the sound pressure of 20 microPascals (µPA). Named after French mathematician, physicist, and philosopher Blaise Pascal (1623-1662).

This is the level of a sound in decibels relative to an internationally defined reference level. The latter corresponds to an intensity of 10-12 W/m2, which is equivalent to a sound pressure of 20 microPa

An acoustic measurement for sound output, usually from speakers, measured in decibels.

(1) Ten times the logarithm to the base ten of the ratio of the time-mean-square pressure of a sound, in a stated frequency band, to the square of the reference sound pressure in gases of 20 micropascals (µPa). Unit, dB; symbol, Lp. (2) For sound in media other than gases, unless otherwise specified, reference sound pressure in 1 µPa (ANSI S1.1-1994: sound pressure level).

The level of sound energy, measured in dB, at a specific location. The frequency range of the measurement or calculation must be indicated along with the sound level in dB.

An important measure of sound loudness, the level is calculated in decibels by 20 times the logarithm to the base 10 of the ratio of the measured sound pressure level and the reference point.

A measurement in which the sound pressure is expressed as so many decibels ( dB) above a standard reference pressure level, which is close to the threshold of hearing at middle frequencies. SPL, as it is called, is a standardized measurement, and is always done with the measuring instrument set to the "linear" mode, with all frequencies represented equally. Measurements made with A, B, C, or other weightings, are called Sound Level measurements. See Frequency Weighting, Hearing Threshold, Sound Level.

A measure of sound intensity, or loudness. Measured in decibels or more correctly, dBA. The noise around a typical city street measures 60dBA. An average Nirvana fan with a big system in their trailer in Humptulips can exceed 150dBA.

Measured in decibels (dB); is an expression of loudness or volume. A 10db increase in SPL requires 10 times the power but sounds only twice as loud . Live orchestral music reaches brief peaks in the 105db range and live rock easily goes over 120db.

An acoustic measurement for the ratios of sound energy. Rated in decibels (SPL dBA, SPL dBC).

The measurement of loudness, or amplitude, of sound, expressed in dB.

Measured in decibel units (dB), the SPL is the standard measurement specification for the volume of a headphone. For comparison, concert volume is at about 100dB and a quiet home is at about 60dB.

The sound pressure level, in decibels, of a sound is 20 time the logarithm to the base of 10 of the ratio of the sound pressure to the reference pressure. The reference pressure shall be explicitly stated and is defined by standard.

A measure of the sound pressure present; dB above the Threshold of Hearing (.0002 Microbars).

20 times the logarithm to the base 10 of the ratio of the RMS sound pressure to the reference pressure of 20 micropascals (20x10µN/m). The sound pressure level is denoted Lp, or SPL and is expressed in decibels.

Sound pressure level is a measurement of the pressure fluctuations of a sound wave as it propagates through the air. Because of the wide range of pressures to which the ear responds, a logarithmic scale is used and is expressed as a ratio of the measured pressure referenced to a pressure of 2x10-5 N/m2 (20 m Pa) which is the threshold of human hearing at 1000 Hz. The measure is expressed in decibels (dB). The Bel unit is named after Alexander Graham Bell.

The measure of the amplitude or volume of sound. Sound Pressure Level is measured in decibels (dB).

the loudness of an acoustic wave stated in dB that is proportional to the logarithm of its intensity.

Given in decibels (DB) is an expression of loudness or volume. A 10db increase in SPL represents a doubling in volume. Live orchestral music reaches brief peaks in the 105db range and live rock easily goes over 120db.

Abbreviated as SPL. It is the standard measurement of loudness of a sound. Expressed in decibels (dB) relative to the threshold of human hearing.

A measure, in decibels, of the sound pressure at a particular point. It is dependent upon distance from the source and many other extraneous factors.

Measurement in decibels of the pressure or force exerted by a sound wave on the environment with increasing pressure generating increased loudness or higher volume (creating more pressure in the ear increases perceived loudness).

A measure of air pressure changes caused by a sound wave and expressed on a decibel scale referenced to 20µPa.

the sound pressure level of a noise source, expressed as a decibel value

The expression of loudness or volume; measured in decibels (dB). A 10 dB increase in SPL represents a doubling in volume.

Measure of sound in units of decibels. 0 dB is considered to be the lower threshold of human hearing. Most often Sound Pressure Levels are expressed in A-weighted SPL (dBA). See also A-weighted.

The momentary pressure measurement expressed in dB as a ratio to a given power level.

An acoustic measurement of sound energy, typically expressed in dB SPL.

Acoustic measurement for sound output. Measured in dB, the readings are often "weighted" to reflect how human ears work.

the level of acoustic sound waves, measured in dB. A typical SPL reading for a rock concert is 95dB

Splatter Splay

Show related articles STB

the physical intensity of sound