| 释义 |
neper|niː-, ˈneɪpə(r)|
Also † napier.
[f. Neperus, Latinized form of the name of John Napier (or Neper) (see Napier's bones).]
A unit used in comparing the power levels in two communication circuits or the intensities of two sounds: their difference in nepers is equal to half the natural logarithm of their ratio.
1924K. S. Johnson Transmission Circuits for Telephonic Communication vii. 46 The transformer loss (expressed in napiers). 1929[see bel]. 1931[see decineper (deci- 1)]. 1954Electronic Engin. XXVI. 91 The short line with which we are concerned in this article is defined as one for which the overall attenuation coefficient is small, say not greater than 0·2 neper, although the line may be several wavelengths long. 1972J. M. Taylor tr. Meyer & Neumann's Physical & Appl. Acoustics i. 11 One neper corresponds to 8·69 dB. |