International
Tables for
Crystallography
Volume C
Mathematical, physical and chemical tables
Edited by E. Prince

International Tables for Crystallography (2006). Vol. C, ch. 7.1, p. 635

Figure 7.1.7.4 

J. Chikawac
[Figure 7.1.7.4]
Figure 7.1.7.4

Principles of a noise reducer.