| 释义 |
volume expander
volume expander[′väl·yəm ik‚span·dər] (engineering acoustics) An audio-frequency control circuit sometimes used to increase the volume range of a radio program or recording by making weak sounds weaker and loud sounds louder; the expander counteracts volume compression at the transmitter or recording studio. Also known as automatic volume expander. volume expander
volume expanderAny solution used as an intravenous infusion to increase blood pressure by treating relative or absolute dehydration. Such expanders include isotonic or balanced solutions, solutions containing crystalloids, (such as lactated Ringer solution), dextrans, and blood components. |