mobility
6.79 mobility. Analogous mobilities are defined as the ratios of the following complex amplitudes: mechanical mobility ZM =velocity across/force through; rotational mobility ZR =angular velocity across/torque through; acoustic mobility ZA =volume velocity across/sound pressure through; electric impedance Z =voltage across/current through. The real part of each mobility is called responsiveness and the imaginary part the excitability. The reciprocal on any mobility is an immobility whose real part is unresponsiveness and imaginary part is unexcitability.
mobility analogy
6.78 mobility analogy. Analogy in which some of the quantities in the following groups are considered analogous: (1) mechanical, rotational, and acoustic mobilities, and electric impedance; (2) velocity across, angular velocity across, volume velocity across; (3) force through, torque through, sound pressure through, and current through, etc.
coupling loss
6.77 transducer voltage coupling loss; coupling loss. Of an electroacoustic transducer consisting of a sound-receiving element (e.g., microphone or hydrophone) and associated electrical system, for a specified frequency, ten times the logarithm to the base ten of the ratio of the time-mean-square of the open-circuit output voltage of the electroacoustic element to the time-mean-square of the open-circuit voltage of the associated electrical system. Unit, decibel (dB). Annotation To facilitate the use of an electroacoustic element having a high electrical impedance, the element is usually combined with a device such as a preamplifier or transformer. A piezoelectric hydrophone, for example, may consist of a crystal and preamplifier. The free-field voltage sensitivity is […]
transducer voltage coupling loss
6.77 transducer voltage coupling loss; coupling loss. Of an electroacoustic transducer consisting of a sound-receiving element (e.g., microphone or hydrophone) and associated electrical system, for a specified frequency, ten times the logarithm to the base ten of the ratio of the time-mean-square of the open-circuit output voltage of the electroacoustic element to the time-mean-square of the open-circuit voltage of the associated electrical system. Unit, decibel (dB). Annotation To facilitate the use of an electroacoustic element having a high electrical impedance, the element is usually combined with a device such as a preamplifier or transformer. A piezoelectric hydrophone, for example, may consist of a crystal and preamplifier. The free-field voltage sensitivity is […]
dynamic range (of a spectrum)
6.76 dynamic range (of a spectrum). The ratio of the maximum to minimum values that occur across the bandwidth of the spectrum.