@article {Ingemansson:1997:1021-643X:157, title = "Noise control: Principles and practices - Part 11", journal = "Noise News International", parent_itemid = "infobike://ince/nni", publishercode ="ince", year = "1997", volume = "5", number = "3", publication date ="1997-09-01T00:00:00", pages = "157-161", itemtype = "ARTICLE", issn = "1021-643X", url = "https://ince.publisher.ingentaconnect.com/content/ince/nni/1997/00000005/00000003/art00002", doi = "doi:10.3397/1.3703030", author = "Ingemansson, Stig", abstract = "This is the eleventh of fifteen parts that present illustrations of noise control principles and practices. The illustrations in this article appeared first in a book published in Sweden by the Swedish Work Environment Fund. The effectiveness of reactive mufflers in narrow frequency ranges and elimination of pure tones with cancelling sound are illustrated.", }