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Machine translation
1. (WO1980001964) NOISE REDUCTION APPARATUS
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/001964    International Application No.:    PCT/US1979/000200
Publication Date: 18.09.1980 International Filing Date: 02.04.1979
IPC:
G11B 20/06 (2006.01), G11B 20/22 (2006.01)
Applicants:
Inventors:
Priority Data:
17360 05.03.1979 US
Title (EN) NOISE REDUCTION APPARATUS
(FR) APPAREIL DE REDUCTION DU BRUIT
Abstract: front page image
(EN)An improved apparatus for reducing noise in a frequency-modulated data stream of the type utilizing a reference stream of predetermined frequency that has been subjected to essentially the same noise. In a preferred embodiment of the apparatus, the data stream is transformed by a first discriminator (52) into a first signal of value proportional to the frequency of the data stream, and the reference stream is transformed by a second discriminator (53) into a second signal that has a value proportional to the product of the reference stream frequency times a feedback value (41). The feedback value is derived from a combination of the first and second signals in a combiner (44). One of the important uses of the apparatus is in connection with frequency modulation tape recording systems.
(FR)Appareil ameliore de reduction du bruit dans un flux de donnees a frequence modulee du type utilisant un flux de reference d"une frequence predeterminee qui a ete soumis essentiellement au meme bruit. Dans un mode preferentiel de realisation de l"appareil, le flux de donnees est transforme par un premier discriminateur (52) en un premier signal d"une valeur proportionnelle a la frequence du flux de donnees, et le flux de reference est transforme par un second discriminateur (53) en un second signal qui possede une valeur proportionnelle au produit de la frequence du flux de reference soit une valeur de reaction (41). La valeur de reaction est derivee d"une combinaison des premier et second signaux dans un combinateur (44). L"une des utilisations importantes de l"appareil concerne les systemes d"enregistrement sur bande a modulation de frequence.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)