reference sound pressure造句

Commonly used reference sound pressures, defined in the standard 礟a in water.
Without a specified reference sound pressure, a value expressed in decibels cannot represent a sound pressure level.
With any specified reference sound pressure, a sound pressure that is equal to the reference has zero decibels relation to it.
The commonly used " zero " reference sound pressure in air is 20 talk ) 13 : 59, 19 July 2010 ( UTC)
This is 20 times the base 10 logarithm of the ratio of a given root-mean-square sound pressure to the reference sound pressure.
It's difficult to find reference sound pressure in a sentence. 用reference sound pressure造句挺难的

The centimeter-gram-second system of units, the reference sound pressure for measuring ambient noise level is 0.0002 dyn / cm 2.
The " loudness of inaudible sound ", regardless of reference sound pressure, is actually minus infinity decibels . talk ) 21 : 29, 15 April 2009 ( UTC)
Unit, dB; symbol, Lp . ( 2 ) For sound in media other than gases, unless otherwise specified, reference sound pressure in 1 礟a ( ANSI S1.1-1994 : sound pressure level ).
Formally, " L AT " is 10 times the base 10 logarithm of the ratio of a root-mean-square A-weighted sound pressure during a stated time interval to the reference sound pressure and there is no time constant involved.
Sound pressure level : ( 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 ( 礟a ).
This being said, our own Wikipedia article on Sound pressure states that'The commonly used reference sound pressure in air is p _ ref = 20 礟a ( rms ), which is usually considered the threshold of human hearing'. . . talk ) 21 : 37, 10 September 2009 ( UTC ).