dynamic range (of an acoustic quantity)
6.75 dynamic range (of an acoustic quantity). The ratio of the maximum to minimum values that occur.
dynamic range (of an electroacoustic transducer)
6.74 dynamic range (of an electroacoustic transducer). The range in operating amplitude between a minimum threshold level that is set by the inherent noise and an upper limit set by tolerance in nonlinearities or distortion. Unit, decibel (dB). Annotation 1 The dynamic range is usually specified for a particular operating frequency range. Annotation 2 Useful dynamic range is typically limited by electric circuit noise or mechanical membrane noise due to the Brownian motion of air molecules impinging on the membrane. The nature of the noise limit should be stated explicitly (e.g., equipment noise, thermal noise, etc.). Annotation 3 The method of nonlinearity or distortion determination and the type of nonlinearity […]
equivalent noise pressure level
6.73 equivalent noise pressure level. Of a transducer, twenty times the logarithm to the base ten of the ratio of the root-mean-square of the equivalent noise pressure to the stated reference pressure. Unit, decibel (dB).
inherent noise pressure
6.72 equivalent noise pressure; inherent noise pressure. Of an electroacoustic transducer or system used for sound reception, the root-mean-square sound pressure of a sinusoidal plane progressive wave, which, if propagated parallel to the principal axis of the transducer, would produce an open-circuit signal voltage equal to the root-mean-square of the inherent open-circuit noise voltage of the transducer in a transmission band having a bandwidth of 1 Hz and centered on the frequency of the plane sound wave. Unit, pascal (Pa). Annotation If the equivalent noise pressure of the transducer is a function of secondary variables, such as ambient temperature or pressure, the applicable value of these quantities should be stated explicitly.
equivalent noise pressure
6.72 equivalent noise pressure; inherent noise pressure. Of an electroacoustic transducer or system used for sound reception, the root-mean-square sound pressure of a sinusoidal plane progressive wave, which, if propagated parallel to the principal axis of the transducer, would produce an open-circuit signal voltage equal to the root-mean-square of the inherent open-circuit noise voltage of the transducer in a transmission band having a bandwidth of 1 Hz and centered on the frequency of the plane sound wave. Unit, pascal (Pa). Annotation If the equivalent noise pressure of the transducer is a function of secondary variables, such as ambient temperature or pressure, the applicable value of these quantities should be stated explicitly.